X Term I Science Exam 2024-2025 PDF

INTERNATIONAL INDIAN SCHOOL, RIYADH [**TERM I** EXAMINTION 2024-25] *[CLASS:] **X** [SUBJECT:] SCIENCE (086)* *[TIME]: 3 HOURS [MARKS:] 80* SET **A** \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ +-----------------------+------...

INTERNATIONAL INDIAN SCHOOL, RIYADH [**TERM I** EXAMINTION 2024-25] *[CLASS:] **X** [SUBJECT:] SCIENCE (086)* *[TIME]: 3 HOURS [MARKS:] 80* SET **A** \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ +-----------------------+-----------------------+-----------------------+ | | **[General | | | | Instructions:]{.under | | | | line}** | | | | | | | | i. ii. iii. iv. v. | | | | vi. vii. viii. | | +=======================+=======================+=======================+ | | **SECTION A** | | | | | | | | Select and write the | | | | most appropriate | | | | option out of the | | | | four options given | | | | for each of the | | | | questions 1 to 20 | | +-----------------------+-----------------------+-----------------------+ | **1** | A solution of pH 2 is | 1 | | | filled in two | | | | separate beakers. A | | | | few drops of methyl | | | | orange and | | | | phenolphthalein are | | | | added into separate | | | | solutions. How will | | | | the colour of the | | | | indicators change? | | | | | | | | **(a)** Methyl Orange | | | | - Red, | | | | Phenolphthalein - | | | | Pink | | | | | | | | **(b)** Methyl Orange | | | | - Orange, | | | | Phenolphthalein - | | | | Pink | | | | | | | | **(c)** Methyl Orange | | | | - Red, | | | | Phenolphthalein - | | | | Colourless | | | | | | | | **(d)** Methyl Orange | | | | - Orange, | | | | Phenolphthalein | | | | -Colourless. | | +-----------------------+-----------------------+-----------------------+ | **2** | Translate the | 1 | | | following statement | | | | into the chemical | | | | equation and choose | | | | the correct option " | | | | Hydrogen gas combines | | | | with nitrogen to form | | | | ammonia" | | | | | | | | **(a)** H~2~ + | | | | N~2~\-\-\-\-\-\-\-\-\ | | | | -\-\-\-\-\-\--🡪 | | | | NH~3~ | | | | | | | | **(c)** 3H~2~+ | | | | N~2~\-\-\-\--🡪2NH~3~ | | | | | | | | **(d)** H~2~+ | | | | 2N\-\-\-\-\-\--🡪 | | | | 2NH~3~ | | +-----------------------+-----------------------+-----------------------+ | **3** | In the reaction of | 1 | | | aluminium with MnO2. | | | | | | | | 3MnO~2~ + | | | | 4Al\-\-\-\-\--🡪 | | | | 3Mn+2Al~2~O~3~ | | | | | | | | Which option in given | | | | below table correctly | | | | represents the | | | | substance oxidized | | | | and the oxidizing | | | | agent. | | | | | | | | **Substan | | | | ce Oxidized** **Oxi | | | | dizing Agent** | | | | --------- --------- | | | | --------------- ----- | | | | ---------------- | | | | **(a)** Al | | | | Al~2~ | | | | O~3~ | | | | **(b)** Al | | | | Al | | | | **(c)** MnO~2~ | | | | Al | | | | **(d)** Al | | | | MnO~2 | | | | ~ | | +-----------------------+-----------------------+-----------------------+ | **4** | Which of the | 1 | | | following substance | | | | will not give carbon | | | | dioxide on treatment | | | | with dilute acid. | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **5** | Chemical properties | 1 | | | of acids are given | | | | below in a tabular | | | | form. Which one of | | | | the options is not | | | | true? | | | | | | | | **(a)** Acid + Me | | | | tal Salt | | | | + H~2~ | | | | --------- --------- | | | | --------------- ----- | | | | ----------------- | | | | **(b)** Acid + Me | | | | tal Carbonate Salt | | | | + CO~2~ + H~2~O | | | | **(c)** Acid + Ba | | | | se Salt | | | | + H~2~O | | | | **(d)** Acid + Me | | | | tal Oxide Salt | | | | + H~2~ | | +-----------------------+-----------------------+-----------------------+ | **6** | Reema took 5 ml of | 1 | | | lead nitrate solution | | | | in a test tube and | | | | added approximately 4 | | | | ml of potassium | | | | iodide solution to | | | | it. What would she | | | | observe? | | | | | | | | **(a)** The solution | | | | turns red. | | | | | | | | **(b)** Yellow | | | | precipitate was | | | | formed | | | | | | | | **(c)** White | | | | precipitate was | | | | formed | | | | | | | | **(d)** The reaction | | | | mixture becomes hot. | | +-----------------------+-----------------------+-----------------------+ | **7** | The acid having the | 1 | | | highest hydronium ion | | | | concentration is one | | | | with | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **8** | The process in which | 1 | | | transport of soluble | | | | products of | | | | photosynthesis takes | | | | place in plants is | | | | known as | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **9** | The sense organ in | 1 | | | which olfactory | | | | receptors are present | | | | is | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **10** | Consider the | 1 | | | following statements | | | | about small intestine | | | | and select the one | | | | which is NOT correct. | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **11** | The blood leaving the | 1 | | | tissues becomes rich | | | | in | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **12** | In a neuron, the | 1 | | | conversion of | | | | electrical signal to | | | | a Chemical signal | | | | occurs at | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **13** | The refractive index | 1 | | | of glass is 3/2. The | | | | velocity of light in | | | | glass is | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **14** | Magnification | 1 | | | produced by a | | | | rear-view mirror | | | | fitted in vehicles: | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **15** | The inner lining of | 1 | | | stomach is protected | | | | by one of the | | | | following from | | | | hydrochloric acid. | | | | Choose the correct | | | | one. | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | **16** | Identify the | 1 | | | components of the | | | | phloem tissue that | | | | help us in the | | | | transportation of | | | | food in plants. | | | | | | | | a. b. c. d. | | +-----------------------+-----------------------+-----------------------+ | | Question No. 17 to 20 | | | | consist of two | | | | statements -- | | | | **Assertion (*A*)** | | | | and **Reason (*R*).** | | | | Answer these | | | | questions by | | | | selecting the | | | | appropriate option | | | | given below: | | | | | | | | **(a)** Both *A* and | | | | *R* are true, and *R* | | | | is the correct | | | | explanation of *A*. | | | | | | | | **(b)** Both *A* and | | | | *R* are true, and *R* | | | | is not the correct | | | | explanation of *A*. | | | | | | | | **(c)** *A* is true | | | | but *R* is false. | | | | | | | | **(d)** *A* is false | | | | but *R* is true | | +-----------------------+-----------------------+-----------------------+ | **17** | **Assertion (*A*):** | 1 | | | Sodium hydrogen | | | | carbonate is used as | | | | an ingredient in | | | | antacids. | | | | | | | | **Reason (*R*):** | | | | NaHCO~3~ is a mild | | | | non-corrosive basic | | | | salt. | | +-----------------------+-----------------------+-----------------------+ | **18** | **Assertion (*A*):** | 1 | | | Resins and gums are | | | | stored in old xylem | | | | tissues in plants. | | | | | | | | **Reason (*R*):** | | | | Resins and gums | | | | facilitate the | | | | transport of water | | | | molecules. | | +-----------------------+-----------------------+-----------------------+ | **19** | **Assertion (*A*):** | 1 | | | The height of an | | | | object is always | | | | considered positive | | | | | | | | **Reason (*R*):** An | | | | object is always | | | | placed above the | | | | principal axis in the | | | | upward direction | | +-----------------------+-----------------------+-----------------------+ | **20** | **Assertion (*A*):** | 1 | | | Reflex arc works | | | | faster than thinking | | | | process. | | | | | | | | **Reason (*R*):** | | | | Reflex arc works only | | | | in the case of | | | | animals who do not | | | | have thinking | | | | process. | | +-----------------------+-----------------------+-----------------------+ | | **SECTION B** | | | | | | | | Question No. 21 to 26 | | | | are **very short | | | | answer** questions | | +-----------------------+-----------------------+-----------------------+ | **21** | A student took a | 2 | | | small amount of | | | | copper oxide in a | | | | conical flask and | | | | added dilute | | | | hydrochloric acid to | | | | it with constant | | | | stirring. He observed | | | | a change in colour of | | | | the solution. | | | | | | | | ***(a)*** Write the | | | | name of the compound | | | | formed and its | | | | colour. ***(b)*** | | | | Write a balanced | | | | chemical equation for | | | | the reaction | | | | involved. | | +-----------------------+-----------------------+-----------------------+ | **22** | Sometimes while | 2 | | | running an athlete | | | | suffers from muscle | | | | cramps. Why? How is | | | | the respiration in | | | | this case differ from | | | | aerobic respiration? | | +-----------------------+-----------------------+-----------------------+ | **23** | What is the other | 2 | | | name given for lymph? | | | | State its two | | | | functions. | | | | | | | | ***OR*** | | | | | | | | Name one nitrogenous | | | | waste present in | | | | urine. How is the | | | | amount of urine | | | | produced is | | | | regulated? | | +-----------------------+-----------------------+-----------------------+ | **24** | List the new | 2 | | | Cartesian sign | | | | convention for | | | | reflection of light | | | | by spherical mirrors. | | +-----------------------+-----------------------+-----------------------+ | **25** | A student traces the | 2 | | | path of ray of light | | | | through a rectangular | | | | glass slab, as | | | | follows, but leaves | | | | it unlabelled and | | | | incomplete. | | | | | | | |  | | | | | | | | Redraw the complete | | | | diagram and label in | | | | it | | | | | | | | ***(a)*** Angle of | | | | incidence ∠i | | | | | | | | ***(b)*** Angle of | | | | refraction ∠r | | | | | | | | ***(c)*** Angle of | | | | emergence ∠e | | | | | | | | ***(d)*** Lateral | | | | displacement | | | | | | | | ***OR*** | | | | | | | | Study the following | | | | diagrams: | | | | | | | | ***I=Image, | | | | O=Object*** | | | | | | | | Identify **Mirror 1** | | | | and **Mirror 2** and | | | | state one use of | | | | each. | | +-----------------------+-----------------------+-----------------------+ | **26** | ***(a)*** How is | 2 | | | brain protected from | | | | injury and shock? | | | | | | | | ***(b)*** Name the | | | | parts of brain | | | | responsible for | | | | thinking and | | | | balancing the body. | | +-----------------------+-----------------------+-----------------------+ | | **SECTION C** | | | | | | | | Question No. 27 to 33 | | | | are **short answer** | | | | questions | | +-----------------------+-----------------------+-----------------------+ | **27** | ***(a)*** While | 3 | | | electrolysing water | | | | before passing the | | | | current some drops of | | | | an acid are added. | | | | Why? Name the gases | | | | liberated at cathode | | | | and anode. Write the | | | | relationship between | | | | the volume of gas | | | | collected at anode | | | | and cathode. | | | | | | | | ***(b)*** What is | | | | observed when silver | | | | chloride is exposed | | | | to sunlight? Give the | | | | type of the reaction | | | | involved. | | | | | | | | ***OR*** | | | | | | | | Write balanced | | | | chemical equations | | | | for the following | | | | reactions. | | | | | | | | *(i)* NaOH solution | | | | is heated with zinc | | | | granules. | | | | | | | | *(ii)* Carbon dioxide | | | | gas is passed through | | | | lime water. | | | | | | | | *(iii)* A piece of | | | | Zinc is dipped in | | | | ferrous sulphate | | | | solution. | | +-----------------------+-----------------------+-----------------------+ | **28** | ***(a)*** Suggest a | 3 | | | safe procedure for | | | | diluting a strong | | | | concentrated acid. | | | | | | | | ***(b)*** Dry HCl gas | | | | does not change the | | | | colour of dry blue | | | | litmus paper. Why? | | | | | | | | ***(c)*** Define pH. | | | | How is it related | | | | with hydrogen ion | | | | concentration in a | | | | solution? | | | | | | | | a. What is the | | | | colour of ferrous | | | | sulphate | | | | crystals? How | | | | does this colour | | | | change after | | | | heating? | | | | | | | | b. Name the products | | | | formed on | | | | strongly heating | | | | ferrous sulphate | | | | crystals. What | | | | type of chemical | | | | reaction occurs | | | | in this change? | | | | Write the | | | | balanced chemical | | | | equation. | | +-----------------------+-----------------------+-----------------------+ | **29** | The flow of nerve | 3 | | | impulse from axonal | | | | end of one neuron to | | | | dendrite end of next | | | | neuron takes place, | | | | but not in the | | | | opposite direction. | | | | Why? | | +-----------------------+-----------------------+-----------------------+ | **30** | ***(a)*** What is the | 3 | | | internal energy | | | | reserve in plants and | | | | animals? | | | | | | | | ***(b)*** How do | | | | desert plants perform | | | | photosynthesis if | | | | their stomata remain | | | | closed during the | | | | day? | | +-----------------------+-----------------------+-----------------------+ | **31** | ***(a)*** What is | 3 | | | meant by 'power of a | | | | lens'? | | | | | | | | ***(b)*** State and | | | | define the S.I. unit | | | | of power of a lens. | | | | | | | | ***(c)*** A convex | | | | lens of focal length | | | | 25 cm and a concave | | | | lens of focal length | | | | 10 cm are placed in | | | | close contact with | | | | each other. Calculate | | | | the lens power of | | | | this combination. | | +-----------------------+-----------------------+-----------------------+ | **32** | Name the type of | 3 | | | mirror used in the | | | | following situations. | | | | | | | | ***(a)*** Headlights | | | | of a car | | | | | | | | ***(b)*** | | | | Side/rear-view mirror | | | | of a vehicle | | | | | | | | ***(c)*** Solar | | | | furnace | | | | | | | | Support your answer | | | | with a reason. | | +-----------------------+-----------------------+-----------------------+ | **33** | A student has | 3 | | | focussed the image of | | | | an object of height 3 | | | | cm on a white screen | | | | using a concave | | | | mirror of focal | | | | length 12 cm. If the | | | | distance of the | | | | object from the | | | | mirror is 18 cm, find | | | | | | | | ***(a)*** Distance of | | | | the image from the | | | | mirror | | | | | | | | ***(b)*** Height of | | | | the image | | | | | | | | ***(c)*** Nature of | | | | the image | | +-----------------------+-----------------------+-----------------------+ | | **SECTION D** | | | | | | | | Question No. 34 to 36 | | | | are **long answer** | | | | questions. | | +-----------------------+-----------------------+-----------------------+ | **34** | ***(a)*** What do you | 5 | | | observe when lead | | | | nitrate is heated? | | | | Write a balanced | | | | chemical equation. | | | | | | | | Name two types of | | | | reactions in which | | | | this reaction can be | | | | involved. | | | | | | | | ***(b)*** Name the | | | | acid present in an | | | | ant sting and give | | | | its common name, also | | | | give the common | | | | method to get relief | | | | from the discomfort | | | | caused by the ant | | | | sting. | | | | | | | | ***(c)*** Define | | | | exothermic reaction. | | | | Write an example of | | | | an exothermic | | | | reaction as well as a | | | | combination reaction. | | | | | | | | ***OR*** | | | | | | | | ***(a)*** What is | | | | observed when a | | | | solution of sodium | | | | sulphate is added to | | | | a solution of barium | | | | chloride taken in a | | | | test tube? Write the | | | | equation for the | | | | chemical reaction | | | | involved and name the | | | | type of the reaction. | | | | | | | | ***(b)*** When | | | | hydrogen gas is | | | | passed over heated | | | | copper (II) Oxide, | | | | copper and steam are | | | | produced. Write the | | | | balanced chemical | | | | equation. | | | | | | | | *(i)* Name the | | | | substance oxidized | | | | and reduced in this | | | | reaction. | | | | | | | | *(ii)* Name the | | | | oxidizing agent and | | | | reducing agent. | | +-----------------------+-----------------------+-----------------------+ | **35** | ***(a)*** Why there | 5 | | | is a difference | | | | between the rate of | | | | breathing in aquatic | | | | organisms and | | | | terrestrial | | | | organisms? | | | | | | | | ***(b)*** Write two | | | | features that protect | | | | human respiratory | | | | system from polluted | | | | air. | | | | | | | | ***(c)*** Why do | | | | walls of trachea do | | | | not collapse when | | | | there is no air in | | | | it? | | | | | | | | ***(d)*** Name the | | | | organ and its part | | | | where exchange of | | | | gases between air and | | | | blood takes place in | | | | the human body. | | | | | | | | ***OR*** | | | | | | | | ***(a)*** Write the | | | | specific functions of | | | | each of organs in | | | | relation with the | | | | excretion in human | | | | beings. | | | | | | | | *(i)* Renal artery | | | | *(ii)* Urethra | | | | *(iii)* Ureter *(iv)* | | | | Glomerulus | | | | | | | | ***(b)*** How do | | | | plants get rid of | | | | excretory products? | | +-----------------------+-----------------------+-----------------------+ | **36** | ***(a)*** If the | 5 | | | image formed by a | | | | lens is diminished in | | | | size and erect, for | | | | all positions of the | | | | object, what type of | | | | lens is it? | | | | | | | | ***(b)*** Name the | | | | point on the lens | | | | through which a ray | | | | of light passes | | | | undeviated. | | | | | | | | ***(c)*** An object | | | | is placed | | | | perpendicular to the | | | | principal axis of a | | | | convex lens of focal | | | | length 20 cm. The | | | | distance of the | | | | object from the lens | | | | is 30 cm. Find *(i)* | | | | the position *(ii)* | | | | the magnification and | | | | *(iii)* the nature of | | | | the image formed. | | | | | | | | ***OR*** | | | | | | | | 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: | | | | | | | |  | | | | | | | | ***(a)*** What is the | | | | focal length of the | | | | convex lens? State | | | | the reason for your | | | | answer. | | | | | | | | ***(b)*** For what | | | | object-distance (u) | | | | is the corresponding | | | | image-distance (v) | | | | not correct? How did | | | | you arrive at this | | | | conclusion? | | | | | | | | ***(c)*** Choose an | | | | appropriate scale to | | | | draw a ray diagram | | | | for the observation | | | | at S. No. 4 and find | | | | the approximate value | | | | of magnification. | | +-----------------------+-----------------------+-----------------------+ | | **SECTION E** | | | | | | | | Question No. 37 to 39 | | | | are | | | | ***case-based/data-ba | | | | sed*** | | | | questions with 2 to 3 | | | | short sub-parts. | | | | Internal choice is | | | | provided in one of | | | | these sub-parts. | | +-----------------------+-----------------------+-----------------------+ | **37** | pH is measured | 4 | | | generally using the | | | | pH scale. The values | | | | on the pH scale | | | | ranges from 0 to 14. | | | | The table given below | | | | shows the pH of some | | | | common aqueous | | | | solutions. | | | | | | | | ***Solutions*** | | | | ***pH*** | | | | ------------------ | | | | ---------- | | | | Gastric Juice | | | | *2* | | | | Pure Water | | | | *7* | | | | Baking Soda | | | | *9* | | | | Vinegar | | | | *3* | | | | Milk of Magnesia | | | | *11* | | | | Tomato Juice | | | | *4* | | | | | | | | Based on the above | | | | table, arrange the | | | | following in the | | | | decreasing order of | | | | hydrogen ion | | | | concentration. | | | | | | | | Pure water, Tomato | | | | juice, Milk of | | | | magnesia, Vinegar. | | | | | | | | a. b. | | | | | | | | ***OR*** | | | | | | | | Which one of these | | | | has a higher | | | | concentration of | | | | hydrogen ions? Why? | | | | | | | | 1M HCl or 1M | | | | CH~3~COOH. | | +-----------------------+-----------------------+-----------------------+ | **38** | The heart is the | 4 | | | pumping organ that | | | | receives blood from | | | | the veins and pumps | | | | into the arteries. It | | | | is situated in the | | | | thoracic cavity which | | | | lies above the | | | | diaphragm between the | | | | two lungs. The heart | | | | is divided into | | | | different chambers. | | | | | | | | ***(a)*** Write the | | | | functions of valves | | | | in the heart. | | | | | | | | ***(b)*** Why | | | | ventricles have | | | | thicker walls than | | | | atria? | | | | | | | | ***(c)*** Why is | | | | separation of right | | | | and left side of | | | | heart is important | | | | for birds and | | | | mammals? | | | | | | | | ***OR*** | | | | | | | | ***(a)*** Name the | | | | following- | | | | | | | | *(i)* blood vessel | | | | which brings | | | | oxygenated blood to | | | | the heart. | | | | | | | | *(ii)* The chamber of | | | | heart that receives | | | | oxygenated blood. | | | | | | | | *(iii)* The blood | | | | vessel that takes | | | | oxygenated blood from | | | | heart to other body | | | | parts. | | | | | | | | *(iv)* The blood | | | | vessel which brings | | | | deoxygenated blood to | | | | heart. | | +-----------------------+-----------------------+-----------------------+ | **39** | A highly polished | 4 | | | surface such as a | | | | mirror reflects most | | | | of the light falling | | | | on it. In our daily | | | | life we use two types | | | | of mirrors plane and | | | | spherical. The | | | | reflecting surface of | | | | a spherical mirrors | | | | may be curved inwards | | | | or outwards. In | | | | concave mirrors, | | | | reflection takes | | | | place from the inner | | | | surface, while in | | | | convex mirrors | | | | reflection takes | | | | place from the outer | | | | surface. | | | | | | | | ***(a)*** Define the | | | | principal axis of a | | | | concave mirror. | | | | | | | | ***(b)*** A ray of | | | | light is incident on | | | | a concave mirror, | | | | parallel to its | | | | principal axis. If | | | | this ray after | | | | reflection from the | | | | mirror passes through | | | | the principal axis | | | | from a point at a | | | | distance of 10 cm | | | | from the pole of the | | | | mirror, find the | | | | radius of curvature | | | | of the mirror. | | | | | | | | ***(c)*** An object | | | | is placed at a | | | | distance of 10 cm | | | | from the pole of a | | | | convex mirror of | | | | focal length 15 cm. | | | | Find the position of | | | | the image. | | | | | | | | ***OR*** | | | | | | | | ***(c)*** A mirror | | | | forms a virtual, | | | | erect and diminished | | | | image of an object. | | | | Identify the type of | | | | this mirror. Draw a | | | | ray diagram to show | | | | the image formation | | | | in this case. | | +-----------------------+-----------------------+-----------------------+