CBSE Science Class 10 Sample Paper 2023-24 PDF

Marking Scheme links are on each paper Class : 10th Sub : Science Disclaimer : 1. These papers are based on the SQP released by CBSE and published by a private organization just for the practice of the students. 2. CBSE has not released these papers and CBSE is not relate...

Marking Scheme links are on each paper Class : 10th Sub : Science Disclaimer : 1. These papers are based on the SQP released by CBSE and published by a private organization just for the practice of the students. 2. CBSE has not released these papers and CBSE is not related to these papers in any manner. 3. Publisher of these papers clearly state that these papers are only for practice of students and questions may not be come in main exam. 4. Please do not spread any rumors that any one paper will be coming in main exam. Page 1 NODIA Sample Paper 1 CBSE Science Class 10 Sample Paper 1 Class X 2023-24 Science (086) Time: 3 Hours Max. Marks: 80 General Instructions: 1. This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. 3. Section A consists of 20 Objective Type questions carrying 1 mark each. 4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words. 5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words. 6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. 7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION-A
Select and write one most appropriate option out of the four options given for each of the questions 1 – 20. 1. The given figure represents a single nephron from a mammalian kidney. Identify the labelled parts, match them with the options (I-IV) and select the correct answer. (i) The site of Ultrafiltration. (ii) Collect the urine an make it more concentrated. (iii) The main site of reabsorption of glucose an amino acids. (iv) Largely responsible for the maintenance of blood pH. (a) (i)-A, (ii)-B, (iii)-C, (iv)-D (b) (i)-A, (ii)-E, (iii)-C, (iv)-D (c) (i)-E, (ii)-E, (iii)-D, (iv)-A (d) (i)-B, (ii)-A, (iii)-C, (iv)-E Click the Button See the free MS/Solutions Page 2 NODIA Sample Paper 1 CBSE Science Class 10 2. The table given below shows the reaction of a few elements with acids and bases to evolve Hydrogen gas. Element Acid Base A. # # B. { { C. { # D. { { Which of these elements form amphoteric oxides? (a) B and D (b) A and D (c) C and D (d) A and C 3. Quick lime combines vigorously with water to form (A) which reacts slowly with the carbon dioxide in air to form (B).Identify the compounds (A) and (B). (A) (B) a. Calcium carbonate Calcium hydroxide b. Calcium hydroxide Calcium carbonate c. Calcium Calcium bicarbonate d. Calcium bicarbonate Calcium 4. Which among the following is/are double displacement reaction(s)? (i) Pb + Cucl 2 $ Pbcl 2 + Cu (ii) Na 2 SO 4 + BaCl 2 $ BaSO 4 + 2NaCl (iii) C + O 2 $ CO 2 (iv) CH 4 + 2O 2 $ CO 2 + 2H 2 O (a) Only (ii) (b) (i) and (iv) (c) (iii) and (iv) (d) (i) and (ii) 5. What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) The temperature of the solution increases. (ii) The temperature of the solution decreases. (iii) The temperature of the solution remains the same. (iv) Salt formation takes place. (a) (i) and (ii) (b) Only (i) (c) (i) and (iv) (d) (ii) and (iii)

Continue on next page..... Click the Button See the free MS/Solutions Page 3 NODIA Sample Paper 1 CBSE Science Class 10 6. Examine the above figure and state which of the following option is correct? (one small box in the figure is equal to 1 cm). (a) The mirror has a focal length of -3 cm and will produce an image of magnification -1. (b) The mirror has a focal length of -6 cm and will produce an image of magnification +1. (c) The mirror has a focal length of -6 cm and will produce an image of magnification -1. (d) The mirror has a focal length of -3 cm and will produce an image of magnification +1. 7. Select the correct statement regarding p , q , r and s. (a) q represents pulmonary artery that carries oxygenated blood from lungs to heart. (b) p represents pulmonary veins that carries deoxygenated blood from heart to lungs. (c) Exchange of gases takes place in r and oxygenated blood is carried back through aorta. (d) Exchange of gases and substances takes place in s and deoxygenated blood is then carried back to the lungs through vena cava. 8. Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have new combination of characters. Choose the new combination from the following : (i) Round, yellow (ii) Round, green (iii) Wrinkled, yellow (iv) Wrinkled, green (a) (i) and (iv) (b) (i) and (ii) (c) (i) and (iii) (d) (ii) and (iii)

Continue on next page..... Click the Button See the free MS/Solutions Page 4 NODIA Sample Paper 1 CBSE Science Class 10 9. When object is placed at centre of curvature, image is formed at the centre of curvature, i.e. m = − 1. A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain a distinct image on the screen, he should move the lens: (a) towards the screen. (b) away from the screen (c) either towards or away from the screen depending upon the position of the object. (d) to a position very far away from the screen. 10. The molecular formulae of three organic compounds are shown below. Choose the correct option. Organic Compound Molecular Compound P C3H8 Q C 5 H 10 R C4H6 Identify the incorrect statement about these three hydrocarbons. (a) P , Q both differ by -CH 2 unit. (b) ALL have different general formula. (c) Q is an alkene. (d) P is an alkane. 11. Which of the following is the correct electronic arrangement of sodium oxide ? 12. The angle of incidence from air to glass at the point O on the hemispherical glass slab is : (a) 0c (b) 45c (c) 180c (d) 90c Click the Button See the free MS/Solutions Page 5 NODIA Sample Paper 1 CBSE Science Class 10 13. Which of the following statements are true about the endocrine glands? (i) They are ductless glands. (ii) They release their hormones into a duct. (iii) They produce chemical messengers called hormones. (iv) They release their hormones directly into the bloodstream. (a) (i), (iii) and (iv) (b) (i) and (iii) (c) (i) and (iv) (d) (i), (ii) and (iii) 14. The image shows a bud developing on a Hydra. How does the bud develop in the Hydra? (a) Bud develops due to repetitive cell division at a specific site (b) Bud develops due to separation of body parts of Hydra (c) Bud develops due to attachment of another Hydra at a specific site (d) Bud develops due to change in the environmental conditions 15. pH of different solutions are given in the table below: Solution pH P 2.2-2.4 Q 13.8-14.0 R 6.5-7.5 S 8.0-9.0 Arrange these solutions in the increasing order of H+ ion concentration. (a) S 1 R 1 Q 1 P (b) P 1 R 1 S 1 Q (c) R1S1Q1P (d) Q 1 S 1 R 1 P 16. Different organs of human eye are labelled as A to F. The Structure of Human Eye

Continue on next page..... Click the Button See the free MS/Solutions Page 6 NODIA Sample Paper 1 CBSE Science Class 10 When light rays enter the eye, most of the refraction occurs at the: (a) part B (b) part D (c) part E (d) outer surface of part F
Question no. 17 to 20 are Assertion-Reasoning based questions. 17. Assertion (A): The planets twinkle while the stars do not. Reason (R): The planets are much closer to the earth than the stars. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. 18. Assertion (A): In human beings, the sex of the individual is largely genetically determined. Reason (R): In snails, sex is not genetically determined. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. 19. Assertion (A): Amoeba always produces two daughter amoebae while Plasmodium divides into many daughter cells. Reason (R): Amoeba undergoes binary fission while Plasmodium undergoes multiple fission. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. 20. Assertion (A): Burning of natural gas is an endothermic process. Reason (R): Methane gas combines with oxygen to produce carbon dioxide and water. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. SECTION-B
Question no. 21 to 26 are very short answer questions. 21. (i) List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function. (ii) Write the function of retina in human eye.

o Explain using ray diagrams how the defect associated with hypermetropic eye can be corrected. Click the Button See the free MS/Solutions Page 7 NODIA Sample Paper 1 CBSE Science Class 10 22. Give reasons: (i) Placenta is extremely essential for foetal development. (ii) Uterine lining becomes thick and spongy after fertilisation. 23. Kulhads (disposable cups made of clay) and disposable paper cups both are used as an alternative for disposable plastic cups. Which one of these two can be considered as a better alternative to plastic cups and why? 24. (i) Name the reproductive and non-reproductive parts of bread mould (Rhizopus). (ii) List any two advantages of vegetative propagation. 25. Observe the given figure and answer the questions that follow: (i) Identify the gas X. (ii) Write the chemical reaction involved. (iii) Which type of chemical reaction is taking place? (iv) is it an exothermic reaction or an endothermic reaction?

o What are strong and weak acids? In the following list of acids, separate strong acids from weak acids. Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. 26. How do auxins promote the growth of a tendril around a support ? SECTION-C
Question no. 27 to 33 are short answer questions. 27. Differentiate between a glass slab and a glass prism. What happens when a narrow beam of (i) a monochromatic light, and (ii) white light passes through (a) glass slab and (b) glass prism? 28. In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer. Grass " Grass Hopper " Frog " Snake " Peacock.

Continue on next page..... Click the Button See the free MS/Solutions Page 8 NODIA Sample Paper 1 CBSE Science Class 10 29. Two resistors with resistance 10 Ω and 15 Ω are to be connected to a battery of emf 12 V so as to obtain: (i) minimum current (ii) maximum current Describe the mode of connecting the resistances in each case. Calculate the strength of the total current in the circuit in each case.

o (i) State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also draw a graph to show this relationship. (ii) Find the resistance of a conductor if the electric current flowing through it is 0.35 A when the potential difference across it is 1.4 V. 30. Analyse the following observation table showing variation of image distance (v) with object distance u in case of a convex lens and answer the questions that follow without doing any calculations: S.No. Object distance u (cm) Image distance v (cm) 1. -100 +25 2. -60 +30 3. -40 +40 4. -30 +60 5. -25 +100 6. -15 +120 (i) What is the focal length of the convex Lens? Give reason to justify your answer. (ii) Write the serial number of the observation which is not correct. On what basis have you arrived at this conclusion? (iii) Select an appropriate scale and draw a ray diagram for the observation at S.No.2. Also find the approximate value of magnification. 31. During electrolysis of brine, a gas G is liberated at anode. When this gas G is passed through slaked lime, a compound C is formed, which is used for disinfecting drinking water. (i) Write formula of G and C. (ii) State the chemical equation involved. (iii) What is common name of compound C ? Give its chemical name. 32. Nervous and hormonal systems together perform the function of control and coordination in human beings. Justify this statement with the help of an example.

o List in tabular form three distinguishing features between cerebrum and cerebellum. 33. The general formula of three compounds A, B and C is C n H 2n B has highest boiling point and C has lowest + boiling point. (i) Name the homologous series to which A, B and C belongs. (ii) Which of these have minimum number of carbon atoms.? (iii) Write the name and molecular formula of 4th member of this homologous series. Click the Button See the free MS/Solutions Page 9 NODIA Sample Paper 1 CBSE Science Class 10 SECTION-D
Question no. 34 to 36 are Long answer questions. 34. (i) Draw a diagram of human excretory system and label on it the following parts: (a) Kidney (b) Ureter (c) Urinary bladder (d) Urethra (ii) Write one main function each of the labelled parts.

o (i) Draw a schematic representation of transport and exchange of oxygen and carbon dioxide during transportation of blood in human beings and label on it: Lung capillaries, Pulmonary artery to lungs, Aorta to body, Pulmonary veins from lungs. (ii) What is the advantage of separate channels in mammals and birds for oxygenated and deoxygenated blood? 35. State reason for the following statements: (i) Tap water conducts electricity whereas distilled water does not. (ii) Dry hydrogen chloride gas does not turn blue litmus red whereas dil. HCl does. (iii) During summer season, a milkman usually adds a very small amount of baking soda to fresh milk. (iv) For dilution of acid, acid is added to water and not water into acid. (v) Ammonia is a base but does not contain hydroxyl group.

o (i) Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity illustrate how these are inter-convertible? (ii) Write chemical names and formula of plaster of Paris and gypsum. 36. (i) State the rule to determine the direction of a (a) magnetic field produced around a straight conductor-carrying current. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and (ii) Magnetic field lines of two magnets are shown in fig. (a) and (b). Select the figure that represent the correct pattern of field lines. Give reason for your answer. Also name the poles of the magnet facing each other. Click the Button See the free MS/Solutions Page 10 NODIA Sample Paper 1 CBSE Science Class 10 SECTION-E
Question no. 37 to 39 are case-based/data-based questions with 2 to 3 short sub-parts. Internal choice is provided in one of these sub-parts. 37. The female reproductive system includes the ovaries, fallopian tubes, uterus, vagina and mammary glands. These organs are involved in the production and transportation of gametes and the production of sex hormones. The female reproductive system also facilitates the fertilisation of ova by sperm and supports the development of offspring during pregnancy and infancy. (i) In which part does: (a) fertilisation take place (b) foetus develop (ii) Which structures in human female are equivalent to the following structures in the male ? (a) Testes (b) Vas deferenes In each case say in what respect the structures are equivalent ?

o (iii) Write the number of immature eggs present in the ovaries of a newly born baby girl. Mention what happen to these immature eggs when the girl attains puberty ? 38. A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB , a strong horse-shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions:

Continue on next page..... Click the Button See the free MS/Solutions Page 11 NODIA Sample Paper 1 CBSE Science Class 10 (i) Why does the rod get displaced on passing current through it? (ii) State the rule that determines the direction of the force on the conductor AB. (iii) (a) If the U shaped magnet is held vertically and the aluminium rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced? (b) Name any two devices that use current carrying conductors and magnetic field.

o (iv) Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor. 39. Ethanol, commonly knowns alcohol, is an active ingredient of all alcoholic drinks. It is also used in medicines such as tincture iodine, cough syrups and many tonics. Ethanol’s molecular formula is C H 6 O which means it 2 has two carbon atoms and one oxygen atom. Inspite of its many benefits, its impact on social behaviour has been questioned as consumption of even a small quantity of ethanol can cause drunkenness. (i) What happens when a small piece of sodium is dropped into ethanol? (ii) Name the compound formed when ethanol is warmed with ethanoic acid in the presence of few drops of conc. H 2 SO 4. (iii) What is the role of conc. H 2 SO 4 in making ethane from ethanol?

o (iv) Name two oxidising agents that are used to convert ethanol to ethanoic acids.

****** Click the Button See the free MS/Solutions Page 1 NODIA Sample Paper 2 CBSE Science Class 10 Sample Paper 2 Class X 2023-24 Science (086) Time: 3 Hours Max. Marks: 80 General Instructions: 1. This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. 3. Section A consists of 20 Objective Type questions carrying 1 mark each. 4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words. 5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words. 6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. 7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION-A
Select and write one most appropriate option out of the four options given for each of the questions 1 – 20. 1. Calculate the current flowing through the 10Ω resistor in the following circuit. (a) 0.6 A (b) 1.2 A (c) 2.0 A (d) 0.2 A 2. Three hydrocarbons X, Y and Z are shown below: X : CH3CH2CH2CH2CH3; Y : CH 3 - C / C - CH 2 CH 3 ; Z : CH 3 CH 2 − CH = CH − CH 3 Identify the incorrect statements about these three hydrocarbons. I. X and Y both differ by a — CH2 unit. II. X and Z have the same boiling point. III. All have different general formulae. IV. Y and Z have different molecular masses.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 2 NODIA Sample Paper 2 CBSE Science Class 10 (a) II and III (b) I and II (c) All the statements are incorrect. (d) I and IV 3. Which of the following phenomena occur, when a small amount of acid is added to water? (i) Ionisation (ii) Neutralisation (iii) Dilution (iv) Salt formation (a) (i) and (iii) (b) (i) and (ii) (c) (ii) and (iv) (d) (ii) and (iii) 4. Two individuals are as shown using geometric shapes. Their sex chromosomes are respectively denoted by Xf Xm and Xf Y. What are the possible combinations of sex chromosomes for their male and female offspring respectively? (a) XmY and XmXm (b) XfXm and XmXm (c) XmY and XmXf (d) XfY and XmY 5. The directional movement in plants as shown in figure is due to which plant hormone? (a) Abscisic acid (b) Cytokinins (c) Auxin (d) Ethylene Click the Following Button to See the Free MS/Solutions Page 3 NODIA Sample Paper 2 CBSE Science Class 10 6. The image shows the model of a family of dogs. It can be observed that the offspring is similar to the parent but not identical. What is the likely reason for this? (a) Fast multiplication of body cells (b) Variation in the genetic material (c) Effect of environment on the offspring (d) Asexual mode of reproduction 7. Which among the following statements is incorrect for magnesium metal? (a) It reacts with cold water to form magnesium oxide and evolves hydrogen gas (b) It burns in oxygen with a dazzling white flame (c) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas. (d) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas 8. The following reaction is used for the preparation of oxygen gas in the laboratory: Heat 2KClO 3 (s) Catalyst 2KCl (s) + 3O 2 (g) Which of the following statement(s) is(are) correct about the reaction? (a) It is a combination reaction. (b) It is a decomposition reaction and endothermic in nature. (c) It is a photochemical decomposition reaction and exothermic in nature. (d) It is a decomposition reaction and accompanied by release of heat. 9. When a 4V battery is connected across an unknown resistor R there is a current of 100 mA in the circuit as shown in the figure. The value of the resistance of the resistor is: (a) 40 Ω (b) 4Ω (c) 0.4 Ω (d) 400 Ω Click the Following Button to See the Free MS/Solutions Page 4 NODIA Sample Paper 2 CBSE Science Class 10 10. In photosynthesis, which substances are used up, which are produced and which are necessary, but remain unchanged after the reaction? S. No. Used up Produced Remain Unchanged (a) Carbon dioxide Water Oxygen (b) Chlorophyll Carbon dioxide Water (c) Oxygen Starch Cellulose (d) Water Oxygen Chlorophyll 11. The most suitable material for making the core of an electromagnet is: (a) iron (b) steel (c) aluminium (d) soft iron 12. The image shows the Fleming’s left-hand rule. Which option explains the rule to understand the working of motor? (a) When a conductor is moved inside a magnetic field, current is produced in the conductor. (b) When a current carrying conductor is moved with a force, it creates the magnetic field. (c) When a current carrying conductor is placed in a magnetic field, it experiences a force by magnetic field. (d) When magnetic field is moved relative to the conductor, current is produced in the conductor. 13. Structural formula of benzene is : Click the Following Button to See the Free MS/Solutions Page 5 NODIA Sample Paper 2 CBSE Science Class 10 14. A student added 10 g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5min and plotted against time, in a graph as shown below. During which time interval did maximum decomposition took place? (a) 10-15 min (b) 15-20 min (c) 0-5 min (d) 5-10 min 15. The diagram given below shows the human excretory system. Identify the function of part labelled as X: (a) to produce urea (b) to excrete urea (c) to store urine (d) to produce urine

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 6 NODIA Sample Paper 2 CBSE Science Class 10 16. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Figure) was set up. Which among the following statement(s) is (are) correct? (i) Bulb will not glow because electrolyte is not acidic. (ii) Bulb will glow because NaOH is a strong base and furnishes ions for conduction. (iii) Bulb will not glow because circuit is incomplete. (iv) Bulb will not glow because it depends upon the type of electrolytic solution. (a) (ii) and (iv) (b) (i) and (iii) (c) (iv) only (d) (ii) only
Question no. 17 to 20 are Assertion-Reasoning based questions. 17. Assertion (A): Amount and timing of hormones released are regulated by feedback mechanisms. Reason (R): Hypersecretion or hyposecretion of any hormone has a harmful effect on our body. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. 18. Assertion (A): Domestic circuits are connected in parallel. Reason (R): Parallel circuits have same current in every part of the circuit. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. 19. Assertion (A): Herbivores have longer small intestine than carnivores. Reason (R): Carnivores can digest cellulose due to the presence of enzyme, cellulase. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. Click the Following Button to See the Free MS/Solutions Page 7 NODIA Sample Paper 2 CBSE Science Class 10 20. Assertion (A): Clove oil is an olfactory indicator. Reason (R): Smell of clove can be characterised in acidic medium, but it cannot be recognised in basic medium. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A). (c) Assertion (A) is true but Reason (R) is false. (d) Assertion (A) is false but Reason (R) is true. SECTION-B
Question no. 21 to 26 are very short answer questions. 21. The diagram given below shows an object O and its image I. Without actually drawing the ray diagram, state the following : (i) Type of lens (Converging/Diverging). (ii) List three characteristics of the image formed if this lens is replaced by a concave mirror of focal length f and an object is placed at a distance 2f in front of the mirror.

o Define the following : (i) Focal length. (ii) Principal focus. 22. Look at the following figures. Choose the correct one and give reason for your answer. 23. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms? 24. (i) What is translocation? Why is it essential for plants? (ii) Where do the substances in plants reach as a result of translocation?

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 8 NODIA Sample Paper 2 CBSE Science Class 10 25. Write the names of the following compounds:

o A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved. 26. Distinguish between unisexual and bisexual flowers giving one example of each. SECTION-C
Question no. 27 to 33 are short answer questions. 27. (i) Draw a block diagram to show the flow of energy in an ecosystem. (ii) In a food chain of frogs, grass, insects and snakes assign trophic level to frogs. To which category of consumers do they belong to? 28. A convex lens made of a material of refractive index n2 is kept in a medium of refractive index n1. A parallel beam of light in incident on the lens. Draw the path of rays of light emerging from the convex Lens, if: (i) n1 1 n2 (ii) n1 = n2 (iii) n1 2 n2

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 9 NODIA Sample Paper 2 CBSE Science Class 10 29. (i) List the factors on which the resistance of a conductor in the shape of a wire depends. (ii) Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason. (iii) Why are alloys commonly used in electrical heating devices? Give reason.

o (i) Write Joule’s law of heating. (ii) Compute the heat generated while transferring 96000 coulomb of charge in two hours through a potential difference of 40V. 30. A student holding a mirror in his hand, directed the reflecting surface of the mirror towards the Sun. He then directed the reflected light on to a sheet of paper held close to the mirror. (i) What should he do to burn the paper? (ii) Which type of mirror does he have? (iii) Will he be able to determine the approximate value of focal length of this mirror from this activity? Give reason and draw ray diagram to justify your answer in this case. 31. Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below: Based on the given information: (i) In which test tubes would you observe the deposition of metal on zinc ? Give reason. (ii) Arrange Zn, Cu, Al and Fe in the increasing order of reactivity. 32. Complete the following flow chart as per the given instructions :

o Write one function of each of the following components of the transport system in human beings : (i) Blood vessels (ii) Lymph (iii) Heart

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 10 NODIA Sample Paper 2 CBSE Science Class 10 33. Identify the type of reactions taking place in each of the following cases and write the balanced chemical equation for the reactions. (i) Zinc reacts with silver nitrate to produce zinc nitrate and silver. (ii) Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide. SECTION-D
Question no. 34 to 36 are Long answer questions. 34. (i) Draw the diagram of female reproductive system and match and mark the following part(s) : (a) Where block is created surgically to prevent fertilisation ? (b) Where Copper-T is inserted ? (c) Inside which condom can be placed ? (ii) Why do more and more people prefer to use condoms ? What is the principle behind use of condoms ?

o Define pollination. Explain the different types of pollination. List two agents of pollination. How does suitable pollination lead to fertilisation ? 35. (i) What is an electromagnet? List any two uses. (ii) Draw a labelled diagram to show how an electromagnet is made. (iii) State the purpose of soft iron core used in making an electromagnet. (iv) List two ways of increasing the strength of an electromagnet, if the material of the electromagnet is fixed 36. (i) Explain the following terms with one example each: (a) Corrosion (b) Rancidity (ii) Explain two ways by which food industries prevent rancidity.

o (i) Balance the following chemical equations: (a) NaOH + H 2 SO 4 $ Na 2 SO 4 + H 2 O (b) PbO + C $ Pb + CO 2 (c) Fe 2 O 2 + Al $ Al 2 O 3 + Fe + Heat (ii) Write the balanced chemical equations for the following reactions: (a) Barium chloride + Potassium sulphate $Barium sulphate + Potassium chloride (b) Zinc + Silver nitrate $ Zinc nitrate + Silver
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on next page..... Click the Following Button to See the Free MS/Solutions Page 11 NODIA Sample Paper 2 CBSE Science Class 10 SECTION-E
Question no. 37 to 39 are case-based/data-based questions with 2 to 3 short sub-parts. Internal choice is provided in one of these sub-parts. 37. Study the figure related to endocrine glands in human being (male) and answer the questions that follows. (i) Which gland secretes digestive enzymes as well as hormones? (ii) Which endocrine gland is present in females but not in males? (iii) Name the endocrine glands P, Q, R and S.

o (iv) Name the hormone responsible for regulation of blood pressure. Also name the gland which secretes this hormone. 38. A girl met with an accident and her leg got fractured. She went to an orthopedician for treatment. On examination, the doctor mixed a white power in water and applied it to her leg along with the cotton and gauze. After a while, it turned into white, solid, hard mass. The doctor said that it would support her fractured bone and help it to join in the right position.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 12 NODIA Sample Paper 2 CBSE Science Class 10 (i) What is ‘white powder’ and ‘white hard solid mass’ called as? Write the chemical name of ‘white powder’ and ‘white hard solid mass. (ii) After treatment, the doctor repacked the white powder back into moisture proof, airtight container. Why ?

o (iii) Write a chemical equation to show the reaction between white powder and water. Find the difference in water molecules of white hard solid mass and white powder. 39. When light goes from one medium to another medium having different optical densities, then refraction of light rays takes place. All the air in the atmosphere is not at the same temperature. Some of the air layers of the atmosphere are cold (optically denser) whereas other layers of the atmosphere are comparatively warm (optically rarer). So, in the atmosphere we have air layers having different optical densities. Atmospheric refraction is the deviation of light from a straight line as it passes through the atmosphere due to the variation in air density. Such refraction can raise or lower, or stretch or shorten the images of distant objects and can also make distant objects appear to twinkle or shimmer. (i) What is atmospheric refraction? (ii) What causes atmospheric refraction? (iii) Name the effects produced by atmospheric refraction.

o (iv) Which has more refractive index-hot air or cold air?

****** Click the Following Button to See the Free MS/Solutions Page 1 NODIA Sample Paper 3 CBSE Science Class 10 Sample Paper 3 Class X 2023-24 Science (086) Time: 3 Hours Max. Marks: 80 General Instructions: 1. This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. 3. Section A consists of 20 Objective Type questions carrying 1 mark each. 4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words. 5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words. 6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. 7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION-A
Select and write one most appropriate option out of the four options given for each of the questions 1 – 20. 1. A student determines the focal length of a device X , by focusing the image of a far off object on the screen positioned as shown in figure The device X is a (a) Convex lens (b) Concave lens (c) Convex mirror (d) Concave mirror

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 2 NODIA Sample Paper 3 CBSE Science Class 10 2. A student traces the path of a ray of light through a glass prism for different angles of incidence. He analysis each diagram and draws the following conclusion: I. On entering prism, the light ray bends towards its base. II. Light ray suffers refraction at the point of incidence and point of emergence while passing through the prism. III. Emergent ray bends at certain angle to the direction of the incident ray. IV. While emerging from the prism, the light ray bends towards the vertex of the prism. Out of the above inferences, the correct ones are: (a) I, II and III (b) I, III and IV (c) II, III and IV (d) I and IV 3. The reaction that differs from the rest of the reaction given is- (a) formation of calcium oxide from limestone (b) formation of aluminium from aluminium oxide (c) formation of sodium carbonate from sodium hydrogen carbonate (d) formation of mercury from mercuric oxide 4. Consider the following table : Substance pH Lemon 2.3 Battery acid x Sea water 8.5 Apple 3.1 The value of x in above table is: (a) 0 (b) 1.3 (c) 2.5 (d) 1.9 5. Which of the following structures is involved in gaseous exchange in woody stem of a plant as shown in the figure? (a) Stomata (b) Guard cell (c) Lenticel (d) Epidermis Click the Following Button to See the Free MS/Solutions Page 3 NODIA Sample Paper 3 CBSE Science Class 10 6. A feature of reproduction that is common to Amoeba, Spirogyra and yeast is that (a) they reproduce asexually (b) they are all unicellular (c) they reproduce only sexually (d) they are all multicellular 7. Ethane (C 2 H 6) on complete combustion gave CO 2 and water. It shows that the results are in accordance with the law of conservation of mass. Then, the coefficient of oxygen is equal to (a) 7/2 (b) 3/2 (c) 5/2 (d) 9/2 8. When white light passes through the achromatic combination of prisms, then what is observed ? (a) Deviation (b) Dispersion (c) Both deviation and dispersion (d) Atmospheric refraction 9. Magnesium reacts with hot water and steam both. Human body stores energy in form of: (a) Glucose (b) Insulin (c) glycogen (d) Fructose 10. No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be- (a) Plane (b) Concave (c) Convex (d) Either plane or convex 11. What must be preserved in an ecosystem, if the system needs to be maintained? (a) producers and carnivores (b) producers and decomposers (c) Carnivores and decomposers (d) Herbivores and carnivores 12. Posture and balance of the body is controlled by (a) cerebrum (b) cerebellum (c) medulla (d) pons

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 4 NODIA Sample Paper 3 CBSE Science Class 10 13. Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the ribbon is to: (a) remove moisture condensed over the surface of ribbon. (b) generate heat due to exothermic reaction. (c) remove magnesium oxide formed over the surface of magnesium. (d) mix silicon from sand paper (silicon dioxide) with magnesium for lowering ignition temperature of the ribbon. 14. Mineral acids are stronger acids than carboxylic acids because (i) mineral acids are completely ionized. (ii) carboxylic acids are completely ionized (iii) mineral acids are partially ionized (iv) carboxylic acids are partially ionized (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (ii) (d) (iii) and (iv) 15. Which among the following statements is incorrect for magnesium metal? (a) It burns in oxygen with a dazzling white flame. (b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas. (c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas. (d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 5 NODIA Sample Paper 3 CBSE Science Class 10 16. Exposure of silver chloride to sunlight for a long duration turns grey due to Which among the following statement(s) is(are) true? 1. the formation of silver by decomposition of silver chloride. 2. sublimation of silver chloride. 3. decomposition of chlorine gas from silver chloride. 4. oxidation of silver chloride. (a) Only 1 (b) 1 and 3 (c) 2 and 3 (d) Only 4
Question no. 17 to 20 are Assertion-Reasoning based questions. 17. Assertion : Photosynthesis is considered as an endothermic reaction. Reason : Energy gets released in the process of photosynthesis. (a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion. (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. 18. Assertion : Our body maintains blood sugar level. Reason : Pancreas secretes insulin which helps to regulate blood sugar levels in the body. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true. 19. Assertion : Artificial kidney is a device used to remove nitrogenous waste products from the blood through dialysis. Reason : Reabsorption does not occur in artificial kidney. (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) Assertion is true but Reason is false. (d) Assertion is false but Reason is true.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 6 NODIA Sample Paper 3 CBSE Science Class 10 20. Assertion : The product of resistivity and conductivity of a conductor depends on the material of the conductor. Reason : Because each of resistivity and conductivity depends on the material of the conductor. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true. SECTION-B
Question no. 21 to 26 are very short answer questions. 21. What prevents the metals such as magnesium, aluminium, zinc and lead from oxidation at ordinary temperature ?

o Explain why sodium hydroxide solution cannot be kept in aluminium containers ? Write equation for the reaction that may take for the same. 22. If you keep the potted plant horizontally for 2-3 days, what type of movements would be shown by the shoot and root after two or three days. Why ? 23. What are the rules of inheritance ? 24. What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants. 25. State two positions in which a concave mirror produces a magnified image of a given object. List two differences between the two images.

o What is the difference between virtual images produced by concave, plane and convex mirror ? 26. Give two examples each of producers, consumers and decomposer. SECTION-C
Question no. 27 to 33 are short answer questions. 27. An organic compound with molecular formula C 3 H 8 O reacts with sodium metal to produce hydrogen gas. Deduce the possible structure of the compound. Write the balanced chemical equation of the reaction. 28. Explain the following chemical changes, giving one example in each case : (i) Displacement or substitution, (ii) Dissociation, (iii) Isomerisation reaction. 29. Our government launches campaigns to provide information about AIDS prevention, testing and treatment by putting posters, conducting radio shows and using other agencies of advertisements. To which category of diseases AIDS belongs ? Name and explain. What is its causative organism ? Also give two more examples of such diseases.

o Distinguish between pollination and fertilisation. Mention the site and the product of fertilisation in a flower. Click the Following Button to See the Free MS/Solutions Page 7 NODIA Sample Paper 3 CBSE Science Class 10 30. Why does a ray of light passing through the centre of curvature of a concave mirror after reflection, is reflected back along the same path ? 31. (a) A compound lens is made of two lenses in contact having powers + 12.5 D and - 2.5 D. Find the focal length and power of the combination. (b) The magnification produced by a mirror is + 1. What does this mean ? 32. In the given circuit, find : (a) Total resistance of the network of resistors (b) Current through ammeter A

o The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below: I (ampere) 0.5 1.0 2.0 3.0 4.0 V (volt) 1.6 3.4 6.7 10.2 13.2 Plot a graph between V and I and calculate the resistance of the resistor. 33. (a) How many eggs are produced every month by either of the ovaries in a human female ? Where does fertilization take place in the female reproductive system ? (b) What happens in case the eggs released by the ovary are not fertilized? SECTION-D
Question no. 34 to 36 are Long answer questions. 34. Discuss the physical properties of non-metals.

o Discuss the exceptions in the properties of metals and non-metals. Click the Following Button to See the Free MS/Solutions Page 8 NODIA Sample Paper 3 CBSE Science Class 10 35. Suggest three contraceptive methods to control the size of human population. Mention two factors that determine the size of population.

o How do the following organisms reproduce by asexual methods ? (a) Euglena (b) Spirogyra (c) Ginger (d) Chrysanthemum (e) Strawberry (f) Mango 36. A household uses the following electric appliances : (i) refrigerator of rating 400 W for 10 hours each day. (ii) two electric fans of rating 80 W each for 6 hours daily. (iii) six electric tubes of rating 18 W each for 6 hours daily. Calculate the electricity bill for the household for month of June, if cost of electrical energy is < 3.00 per unit. SECTION-E
Question no. 37 to 39 are case-based/data-based questions with 2 to 3 short sub-parts. Internal choice is provided in one of these sub-parts. 37. Acids, bases and salts are three main categories of chemical compounds. These have certain definite properties which distinguish one class from the other. The acids are sour in taste while bases are bitter in taste. Tasting a substance is not a good way of finding out if it is an acid or a base! Acids and bases can be better distinguished with the help of indicators. Indicators are substances that undergo a change of colour with a change of acidic, neutral or basic medium. Many of these indicators are derived from natural substances such as extracts from flower petals and barrier. Litmus, a purple dye is extracted from the lichen plant. Some indicators are prepared artificially. For example, methyl orange and phenolphthalein. Given below is a table of indicators and their colour change in acidic and basic medium. Indicator Colour in Acid Colour in Alkali Litmus Red Blue Methyl Pinkish red Yellow Phenolphthalein Colourless Pink (i) Give two examples each of natural and artificial indicators. (ii) An aqueous solution turns red litmus solution blue. Excess addition of which solution would reverse the change-ammonium hydroxide solution or hydrochloric acid? (iii) What will be the change in colour when a few drops of phenolphthalein is added to a solution having pH 8.5.

o (iv) What is universal indicator?

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 9 NODIA Sample Paper 3 CBSE Science Class 10 38. Questions are based on the two table given below. Study these tables related to blood pressure level and answer the question that follow : Table-A BLOOD PRESSURE CATEGORY SYSTOLIC mm Hg DIASTOLIC mm Hg (Upper number) (Lower number) Normal 120 80 Elevated 120–129 Less than 80 High Blood Pressure (Hypertension) 130–139 80–90 Stage 1 High Blood Pressure (Hypertension) 140 or higher 90 or higher Stage 2 Hypertensive crisis (consult your doctor Higher than 180 Higher than 120 immediately) Table-B Time of Measurement Blood Pressure Patient–X Patient–Y Morning 75–115 85–125 Afternoon 79–122 80–120 Evening 82–132 75–110 (i) In the table B, at which time patent–Y have ideal normal blood pressure ? (ii) Identify the patient, which have hypertension stage-1 blood pressure ? (iii) Which Diet is the best for high blood pressure patient ?

o (iv) What is the ideal blood pressure measurement of a human ? 39. After coming from playground, Tanu feels very hungry. But still some more time was required by her mother to cook food. While waiting on dining table Tanu was playing with her spoon. All of sudden she observed two different orientations of her face when she looked her face from both sides of spoon. She was confused why the orientation of her face changed in two cases. She was curious to know why her reflected image appears upside down in the one surface of a spoon but the correct way up in the opposite surface. (i) Which type of image is formed on the both surface of spoon? (ii) As tanu move concave surface of spoon towards her face, again she find that there comes a point (provided the spoon is big enough) where her image flips from inverted to upright. State the condition under which it happens ? Is this image real or virtual?

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 10 NODIA Sample Paper 3 CBSE Science Class 10 (iii) The given ray diagram depict the correct explanation of the image formed by one surface of the spoon. Name the surface which can form the image as depicted in given ray diagram?

o (iv) Tanu was trying to form image using a concave mirror. She got an inverted and real image of same size of the object. Given figure shows four possible positions of the image formed. Figure out the correct position and justify it.

****** Click the Following Button to See the Free MS/Solutions Page 1 NODIA Sample Paper 4 CBSE Science Class 10 Sample Paper 4 Class X 2023-24 Science (086) Time: 3 Hours Max. Marks: 80 General Instructions: 1. This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. 3. Section A consists of 20 Objective Type questions carrying 1 mark each. 4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words. 5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words. 6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. 7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION-A
Select and write one most appropriate option out of the four options given for each of the questions 1 – 20. 1. The following figures show the path of light rays through three lenses marked L1 , L2 and L3 and their focal points F1 , F2 and F3 respectively.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 2 NODIA Sample Paper 4 CBSE Science Class 10 Which of the following diagram shows the concave lens properties? (a) (i) (b) (ii) (c) (iii) (d) (i), (ii) 2. Which of the following phenomena contributes significantly to the reddish appearance of sun at sunrise or sunset? (a) Dispersion of light (b) Scattering of light (c) Total internal reflection of light (d) Reflection of light from the earth 3. As light travels from a rarer to a denser medium it will have (a) increased velocity (b) decreased velocity (c) decreased wavelength (d) both (b) and (c) 4. Refraction of light occurs because of change in velocity or speed of light in different media. When ray of light travels from rarer to denser medium, it moves towards the normal. When it travels from denser to rarer medium, it moves away from the normal. When light ray travels from rarer to denser medium. its velocity and wavelength both decrease. Which of the following statements is/are correct for litmus? 1. Litmus solution is a purple dye. 2. It is extracted from lichen. 3. In neutral solution. it remains colourless. (a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1, 2 and 3 Click the Following Button to See the Free MS/Solutions Page 3 NODIA Sample Paper 4 CBSE Science Class 10 5. Which of the following are correctly matched? 1. Bleaching powder oxidising agent in chemical industries. 2. Baking powder a mixture of sodium hydrogen carbonate and a mild edible acid. 3. Washing soda remove permanent hardness of water. (a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1, 2 and 3 6. Dispersion of light by glass prism is shown in the above figure. Here x and y indicates.......... and.......... colour respectively. (a) red, blue (b) red, indigo (c) red, yellow (d) violet, green 7. Choose the incorrect statement about insulin which is shown in the figure:. (a) It is produced from pancreas. (b) It regulates growth and development of the body. (c) It regulates blood sugar level. (d) Insufficient secretion of insulin will cause diabetes. 8. Four chambered heart is characteristics feature of? (a) Fishes (b) Amphibians (c) Reptiles (d) Mammals Click the Following Button to See the Free MS/Solutions Page 4 NODIA Sample Paper 4 CBSE Science Class 10 9. The necessary conditions for combustion process to occur are 1. availability of air/oxygen. 2. availability or air/oxygen and fuel. 3. temperature of fuel below ignition temperature. 4. temperature of fuel above ignition temperature. Select the correct alternative. (a) 1 and 2 (b) 2 and 4 (c) 3 and 1 (d) 4 and 1 10. Translocation is the process in which plants deliver: (a) minerals from leaves to other parts of the plant (b) plant growth hormones from leaves to other parts of the plant (c) water and organic substance from leaves to other parts of the plant (d) all of the above 11. Which of the following is not a chemical reaction? (a) Souring of milk (b) Dissolution of sugar in water (c) Rusting of iron (d) Digestion of food in the body 12. Which of the following is the correct sequence of events of sexual reproduction in a flower? (a) pollination, fertilisation, seedling, embryo (b) seedling, embryo, fertilisation, pollination (c) pollination, fertilisation, embryo, seedling (d) embryo, seedling, pollination, fertilisation. 13. Dissolution of sugar in water is a physical change. Physical changes are changes affecting the form of a chemical substance but not its chemical composition. Fe 2 O 3 + 2Al " Al 2 O 3 + 2Fe The above reaction is an example of a- (a) combination reaction (b) double displacement reaction (c) decomposition reaction (d) displacement reaction Click the Following Button to See the Free MS/Solutions Page 5 NODIA Sample Paper 4 CBSE Science Class 10 14. The ability of metals to be drawn into thin wire is known as (a) Ductility (b) Malleability (c) Sonority (d) Conductivity 15. The two versions of a trait (character) which are brought in by the male and female gametes are situated on (a) copies of the same chromosome (b) two different chromosomes (c) sex chromosomes (d) any chromosome 16. A soap micelle is shown in th figure. In the soap micelles (a) The ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster. (b) Ionic end of soap is in the interior of the cluster and carbon chain is out of the cluster. (c) Both ionic end and carbon chain are in the interior of the cluster. (d) Both ionic end and carbon chain are on the exterior of the cluster.
Question no. 17 to 20 are Assertion-Reasoning based questions. 17. Assertion : Carbon dioxide turns lime water milky. Reason : Carbon dioxide sullies the water. (a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion. (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. Click the Following Button to See the Free MS/Solutions Page 6 NODIA Sample Paper 4 CBSE Science Class 10 18. Assertion : Phototropism is caused by auxin. Reason : When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true. 19. Assertion : Haemoglobin is not the respiratory pigment in human beings. Reason : It transports oxygen in the human body. (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) Assertion is true but Reason is false. (d) Assertion is false but Reason is true. 20. Assertion : A fuse wire is always connected in parallel with the mainline. Reason : If a current larger than the specified value flows through the circuit, fuse wire melts. (a) Both Assertion and Reason are true and Reason is correct explanation of the assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of the assertion. (c) Assertion is true but Reason is false. (d) Assertion is false but Reason is true. SECTION-B
Question no. 21 to 26 are very short answer questions. 21. When a metal X is treated with cold water, it gives a base Y with molecular formula XOH (Molecular mass = 40 ) and liberates a gas Z which easily catches fire. Identify X , Y and Z and also write the reaction involved.

o What are the constituents of solder alloy ? Which property of solder makes it suitable for welding electrical wires ? 22. On touching a hot plate, you suddenly withdraw your hand. Which category of neurons became active first and which one next ? 23. During crossing why do new features which are not present in the parents appear in the offspring. 24. Are the two cells formed in reproduction are identical? 25. What are the properties of the image formed by a plane mirror ?

o How do we distinguish a medium to be rarer or denser? 26. What would happen if all the decomposers were eliminated from the earth ? Explain. SECTION-C
Question no. 27 to 33 are short answer questions. 27. Write the chemical formula and name of the compound which is the active ingredient of all alcoholic drinks. List its two uses. Write chemical equation and name of the product formed when this compound reacts with- (i) sodium metal (ii) hot concentrated sulphuric acid Click the Following Button to See the Free MS/Solutions Page 7 NODIA Sample Paper 4 CBSE Science Class 10 28. Study the figure given below and answer the following questions : (a) Name the process depicted in the diagram. (b) Write the composition of the anode and the cathode. (c) Write the balanced chemical equation of the reaction taking place in this case. 29. (a) What is the role of autosomes ? (b) Why is it that offspring receives traits from both the parents.

o In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant in the first generation, F1 only tall plants appear. (a) What happens to the traits of the dwarf plants in this case? (b) When the F1 generation plants were self-fertilised, he observed that in the plants of second generation, F2 both tall plants and dwarf plants were present. Why it happened? Explain briefly. 30. The apparent altitude of stars appears to be generally more than their true altitudes. Explain, how. Click the Following Button to See the Free MS/Solutions Page 8 NODIA Sample Paper 4 CBSE Science Class 10 31. What are the causes of the following defects of vision and how can they be corrected ? (a) Cataract (b) Presbyopia. 32. Calculate the total cost of running the following electrical devices in the month of September, if the rate of 1 unit of electricity is ` 6.00. (i) Electric heater of 1000 W for 5 hours daily. (ii) Electric refrigerator of 400 W for 10 hours daily.

o (a) List the factors on which the resistance of a conductor in the shape of wire depends. (b) Why are metals good conductors of electricity whereas glass is a bad conductor of electricity? Give reason. (c) Why are alloys commonly used in electrical heating devices? Give reason. 33. Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival—the one reproducing asexually or the one reproducing sexually? Give reasons to justify your answer. SECTION-D
Question no. 34 to 36 are Long answer questions. 34. (a) All ores are minerals but all minerals are not ores. Justify the statement. (b) What is galvanisation ? (c) Explain roasting with the help of a reaction. (d) What do you mean by amalgam ?

o What are alloys ? How are they made ? Name the constituents and uses of brass, bronze and solder. 35. What is ‘phototropism’ ? How does it occur in plants? Describe an activity to demonstrate phototropism.

o Name the parts C to G on the diagram of a sensory neuron given here. State two ways in which this neuron differs from a motor neuron. 36. (a) Derive the relation for the equivalent resistance when three resistors of resistances R1 , R2 and R3 are connected in parallel. (b) Find the minimum resistance that can be made using four resistors, each of 20 Ω. Click the Following Button to See the Free MS/Solutions Page 9 NODIA Sample Paper 4 CBSE Science Class 10 SECTION-E
Question no. 37 to 39 are case-based/data-based questions with 2 to 3 short sub-parts. Internal choice is provided in one of these sub-parts. 37. Oxidation is the process of gaining of oxygen or losing of hydrogen. Reduction is the process of losing of oxygen or gaining of hydrogen. The substance which undergoes oxidation is the reducing agent while the substance which undergoes reduction is known as the oxidising agent. Oxidation and reduction always take place together and these type of reactions are known as redox reactions. Some of the examples of redox reactions are given below : (a) Pb 3 O 4 + 8HCl $ 3PbCl 2 + Cl 2 + 4H 2 O (b) 2Mg + O 2 $ 2MgO (c) CuSO 4 + Zn $ Cu + ZnSO 4 (d) V2 O 5 + 5Ca $ 2V + 5CaO (e) 3Fe + 4H 2 O $ Fe 3 O 4 + 4H 2 (f) CuO + H 2 $ Cu + H 2 O (i) Give two examples of oxidation reaction from your everyday life. (ii) Write the oxidising agent in the reaction a and b.

o (iii) Out of oxidation and reduction, which reaction takes place at anode? 38. Answer given questions on the basis of your understanding of the following paragraph and the related studies concepts. To make a bread dough, a baker mixes flour, sugar and baking powder (mixture of baking soda and tartaric acid). After mixing all the ingredients, the dough is placed in a container for a few hours (in an oven). On heating, the mixture releases carbon dioxide gas leaving bubbles behind. This increases the size of the bread and makes it soft and spongy. Tartaric acid helps in removing bitter taste. (i) Why does the bread dough rise? (ii) ‘Yeast can be used in place of baking powder for making bread dough’. What is yeast? (iii) What would you use to measure pH of baking powder?

o (iv) Based on the graph represented alongside, answer the following questions: A bakery shop started using baking soda instead of baking powder for baking cakes. What could be the reason for the decrease in the sale of cakes? Click the Following Button to See the Free MS/Solutions Page 10 NODIA Sample Paper 4 CBSE Science Class 10 39. White light is a mixture of seven colours i.e., violet, indigo, blue, green, yellow, orange and red. Every colour has its own characteristic wavelength. Different colours with their wavelengths are given below in the table. S. No. Colour Wavelength 1. Red c 7900 A 2. Orange c 6000 A 3. Yellow c 5800 A 4. Green c 5400 A 5. Blue c 4800 A 6. Indigo c 4500 A 7. Violet c 4000 A The phenomenon of splitting white light into seven colours when it passes through a glass prism is called dispersion of white light. (i) Name the phenomenon occurring in nature due to dispersion of light. (ii) What is monochromatic light? (iii) Light of two colours ‘A’ and ‘B’ pass through a glass prism. ‘A’ deviates more than ‘B’ from its path of incidence. Which colour has a higher speed in the prism ?

o (iv) On which factor speed of light depends ?

****** Click the Following Button to See the Free MS/Solutions Page 1 NODIA Sample Paper 5 CBSE Science Class 10 Sample Paper 5 Class X 2023-24 Science (086) Time: 3 Hours Max. Marks: 80 General Instructions: 1. This question paper consists of 39 questions in 5 sections. 2. All questions are compulsory. However, an internal choice is provided in some questions. A student is expected to attempt only one of these questions. 3. Section A consists of 20 Objective Type questions carrying 1 mark each. 4. Section B consists of 6 Very Short questions carrying 02 marks each. Answers to these questions should in the range of 30 to 50 words. 5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answers to these questions should in the range of 50 to 80 words. 6. Section D consists of 3 Long Answer type questions carrying 05 marks each. Answer to these questions should be in the range of 80 to 120 words. 7. Section E consists of 3 source-based/case-based units of assessment of 04 marks each with sub-parts. SECTION-A
Select and write one most appropriate option out of the four options given for each of the questions 1 – 20. 1. Calcium oxide reacts vigorously with water. Which of the following is the incorrect observation of the reaction shown in the above set up? (a) It is an endothermic reaction. (b) Slaked lime is produced. (c) It is an exothermic reaction. (d) It is a combination reaction. 2. At the time of short circuit, the electric current in the circuit : (a) vary continuously (b) does not change (c) reduces substantially (d) increases heavily

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 2 NODIA Sample Paper 5 CBSE Science Class 10 3. N 2 + 3H 2 $ 2NH 3 With the reference of above reaction which one of the option in the table is correct? Reactants Products (a) N2, H2 NH 3 (b) NH 3 N2, H2 (c) N2 H 2 , NH 3 (d) N 2 NH 3 H2 4. A student require hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, each salt of which when dissolved in distilled water will make it hard. (a) Sodium chloride, Potassium chloride (b) Sodium sulphate, Potassium sulphate (c) Sodium sulphate, Calcium sulphate (d) Calcium sulphate, Calcium chloride 5. Structure present in a cell which is responsible for determination of the sex of a baby is : (a) cytoplasm (b) cell membrane (c) nucleus (d) chromosome 6. The correct structural formula of butanoic acid is

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 3 NODIA Sample Paper 5 CBSE Science Class 10 7. Which one of the following properties is not general exhibited by ionic compounds? (a) Solubility in water (b) Electrical conductivity in solid state (c) High melting and boiling points (d) Electrical conductivity in molten state 8. In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (figure) was set up. Which among the following statement (s) is (are) correct? 1. Bulb will not glow because electrolyte is not acidic. 2. Bulb will glow because NaOH is a strong base and furnishes ions for conduction. 3. Bulb will not glow because circuit is incomplete. 4. Bulb will not glow because it depends upon the type of electrolytic solution. (a) 1 and 3 (b) 2 and 4 (c) Only 2 (d) Only 4 9. A student carries out an experiment and plots the V -I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively (Figure). Which of the following is true ? (a) R1 = R2 = R3 (b) R1 2 R2 2 R3 (c) R3 2 R2 2 R1 (d) R2 2 R3 2 R1 Click the Following Button to See the Free MS/Solutions Page 4 NODIA Sample Paper 5 CBSE Science Class 10 10. Identify the micro-organism whose nutrition type is shown below : (a) Food bacteria (b) Yeast (c) Fungus (d) Amoeba 11. In following diagram the parts A, B and C are sequentially (a) cotyledon, plumule and radicle (b) plumule, radicle and cotyledon (c) plumule, cotyledon and radicle (d) radicle, cotyledon and plumule 12. If the key in the arrangement taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD , the lines are

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 5 NODIA Sample Paper 5 CBSE Science Class 10 (a) concentric circles (b) elliptical in shape (c) straight lines parallel to each other (d) concentric circles near the point O but of elliptical shapes as we go away from it. 13. Which of the following statement is not correct about the magnetic field? (a) Magnetic field lines form a continuous closed curve. (b) Magnetic field line do not interest each other. (c) Direction of tangent at any point on the magnetic field line curve gives the direction of magnetic field at that point. (d) Outside the magnet, magnetic field lines go from South to North pole of the magnet. 14. What is the correct direction of flow of electrical impulses ? 15. Bulb will glow because NaOH is a strong base and furnishes ions for conduction. The diagram shows the arrangement of cells inside the leaf of a green plant. (No cell contents are shown). Which of the following cells normally contain chloroplasts? (a) 2 and 4 (b) 2 and 3 (c) 1 and 2 (d) 1 and 4

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 6 NODIA Sample Paper 5 CBSE Science Class 10 16. The following reaction is an example of a 4NH 3 (g) + 5O 2 (g) $ 4NO (g) + 4H 2 O (g) 1. displacement reaction 2. combination reaction 3. redox reaction 4. neutralisation reaction (a) 1 and 4 (b) 2 and 3 (c) 1 and 3 (d) 3 and 4
Question no. 17 to 20 are Assertion-Reasoning based questions. 17. Assertion : Corrosion of iron is a serious problem. Reason : Every year an enormous amount of money is spent to replace damaged iron. (a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion. (b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion. (c) Assertion is True but the Reason is False. (d) Both Assertion and Reason are False. 18. Assertion : Dominant allele is an allele whose phenotype expresses even in the presence of another allele of that gene. Reason : It is represented by a capital letter, e.g. T. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true. 19. Assertion : All the plants possess autotrophic mode of nutrition. Reason : Due to the presence of green coloured pigment chlorophyll in them. (a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) Assertion is true but Reason is false. (d) Both Assertion and Reason are false. 20. Assertion : The magnetic field produced by a current carrying solenoid is independent of its length and cross- section area. Reason : The magnetic field inside the solenoid is uniform. (a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true.

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 7 NODIA Sample Paper 5 CBSE Science Class 10 SECTION-B Question no. 21 to 26 are very short answer questions. 21. A metal is treated with dil H2 SO 4 , the gas evolved is collected by the method shown in the figure. Answer the following : (i) Name the gas. (ii) Name the method of collection of the gas.

o List any two observations when a highly reactive metal is dropped in water. 22. What do you mean by diffusion ? 23. Which are the first simple molecules of food produced during photosynthesis ? What happens to these simple molecules in the leaves later ? 24. What is the meaning of the term “assimilation” ? 25. Draw a neat diagram to show the refraction of a light ray through a glass prism and label on it the angle of incidence and angle of deviation.

o What is the scattering of light ? Explain with the help of an example. 26. What will happen to the garbage and dead animals and plants in absence of microorganisms ? SECTION-C Question no. 27 to 33 are short answer questions. 27. State which of the following chemical reactions will take place or not, giving suitable reason for each : (i) Zn (s) + CuSO 4 (aq) $ ZnSO 4 (aq) + Cu (s) (ii) Fe (s) + ZnSO 4 (aq) $ FeSO 4 (aq) + Zn (s) (iii) Zn (s) + FeSO 4 (aq) $ ZnSO 4 (aq) + Fe (s)

Continue on next page..... Click the Following Button to See the Free MS/Solutions Page 8 NODIA Sample Paper 5 CBSE Science Class 10 28. Give reasons for the following : (i) Shining surfaces of metals become dull on exposure to air and moisture. (ii) Aluminium is extracted from its ore by electrolysis of molten ore. (iii) Gold is available in the native state. 29. Mention the three kinds of cells present in blood. Write one function of each.

o With the help of diagram explain how exchange of gases occurs in leaf of a plant. 30. Manju is uses a concave mirror for image formation for different positions of an object. What inferences can be drawn about the following when an object is placed at a distance of 10 cm from the pole of a concave mirror of focal length 15 cm ? (a) Position of the image (b) Size of the image (c) Nature of the image Draw a labelled ray diagram to justify your inferences. 31. (a) Define optical centre of a spherical lens. (b) You are given a convex lens of focal length 30 cm. Where would you place an object to get a real, inverted and highly enlarged image of the object ? Draw a ray diagram showing the image formation. (c) A concave lens has a focal length of 20 cm. At what distance should an object be placed so that it forms an image at 15 cm away from the lens ? 32. Pawan is connected a galvanometer with a coil of insulated copper wire.What would happen if a bar magnet is : (i) Pushed into the coil ? (ii) Withdrawn from inside the coil ? (iii) Held stationary inside the coil ?

o You are given two identical looking iron bars. Just using these two bars how will you identify whether any or both of these bars is/are a magnet ? 33. Explain the phenomenon of Biological Magnification. How does it affect organisms belonging to different trophic levels particularly the tertiary consumers ? SECTION-D Question no. 34 to 36 are Long answer que