Physics English PDF (Part-1) 2024 Past Paper

 PHYSICS (Part-01) 1. Heat and thermodynamic 2. Magnetic 3. Optics 4. Sound and Waves 5. Electricity  Physics Heat and thermodynamic 01. Study the following statements:...

 PHYSICS (Part-01) 1. Heat and thermodynamic 2. Magnetic 3. Optics 4. Sound and Waves 5. Electricity  Physics Heat and thermodynamic 01. Study the following statements: 08. Study the following statements 1. Heat is a type of energy 1. Temperatures of – 459° F and – 273.09° C are called 2. Principle of calorimetry- Heat loss by a body is con- absolute temperature. sidered equal to the heat gained by another body. 2. Good emitters are good absorbers, this rule is 3. The unit of heat is considered to be joule or erg or Stefan's law. calorie. Choose the true statement from the above. 3. Water has the highest density at 9°C. (a) Only 1 and 2 (b) Only 2 and 3 Which of the above statements is true. (c) Only 1 and 3 (d) All (a) Only 1 (b) Only 1, 2 02. Which of the following statements is false- (c) Only 2, 3 (d) All 1, 2, 3 (a) The SI unit of temperature is only Fahrenheit. 09. Study the following statements (b) Reamer and Rankine are other units of tem- 1. Conduction of heat is possible only in solids and perature mercury. (c) The range of a clinical thermometer is 36° C to 42° C 2. In non-metallic conductors, the mechanism of con- while the range of a laboratory thermometer is – 10° C to duction is possible due to vibration of particles and free 110° C. electrons. (d) Mercury is not used in digital thermometer. 3. Houses with thatched roofs heat up later than 03. Study the following statements: houses with concrete roofs. 1. The normal temperature of human body is consid- Choose the true statement from the above. ered to be 98.6° F. (a) Only statement 1 2. The condition when the temperature of human body (b) Only statement 2 is more than normal i.e. 105.8° F or 41° C is called medical (c) Only statements 1 and 3 emergency which is known as Hyper pyrexia. (d) All statements 1, 2, 3 3. If the body temperature is 44° C or more, death is 10. Convection of heat is possible in- almost certain. (a) solid and liquid only upper surface of liquid 4. 95° F or 35° C or below is called hypothermia, while (b) liquid and gas 38° C or 100.4° F is called hyperthermia. (c) gas, liquid and gas all Which of the above statements is true? (d) vacuum and gas (a) Only 1, 2 and 4 (b) Only 2, 3, 4 11. Which of the following is not an example of convection- (c) Only 1, 3, 4 (d) 1, 2, 3, 4 all (a) Ventilation process in buildings etc. 04. Which of the following can be used as an alternative to (b) Sea breeze and land breeze, trade winds mercury in a normal clinical thermometer? (c) Mechanism of action of a freezer (a) Arsenic (b) Silicon (d) A hot vessel becoming hotter (c) Gallium (d) Germanium 12. Study the following statements- 05. Study the following statements and choose the incorrect 1. The process of natural convection is possible in one - any direction (a) the temperature of the body at rest is called a basal 2. The speed of radiation is like that of sunlight- body thermometer. 3. Thermal radiation is called electromagnetic radia- (b) Freon gas is known as a refrigerant. tion. (c) Steam contains latent heat of vapor, due to which Choose the incorrect statement from the above steam causes more burning sensation. (a) Only 2 (b) Only 1, 2 (d) The lowest temperature i.e. cryogenic level is (c) Only 3 (d) Only 1, 3 measured by a complete radiation thermometer. 13. Study the following examples- 06. Choose the wrong pair from the following pairs- Ther- 1. Polished shoes do not heat up quickly because mometer scale Freezing point maximum part of sunlight gets reflected. (a) Fahrenheit – 32° F 2. A person with dark skin can feel comparatively hot- (b) Reamer – 0° R ter and colder. (c) Rankine – 460° Ra 3. Sun, Vantablack carbon nano tubes etc. are good (d) Kelvin (K) – 373 K examples of completely black body. 07. Sangeeta (fictitious name) has high fever, right now her Which of the above statements is false? body temperature is 40° C, what will be Sangeeta's body (a) Only 1 (b) Only 2 temperature in Fahrenheit right now- (c) Only 3 (a) 104°F (b) 101.4° F (d) None of the above (c) 102°F (d) 100.4° F KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—3  14. Study the following statements and identify the false 21. Study the statements- statement 1. Atmospheric pressure increases as altitude in- (a) Due to thermal expansion, the needle of the pendu- creases lum is made of invar steel. 2. The boiling point of water decreases as altitude in- (b) The freezing point and melting point are the same. creases (c) The greater the difference in temperature, the greater 3. Human blood circulation system is an example of will be the rate of heat loss in objects. convection. (d) Pemba effect opposes Newton's law of cooling. Choose the wrong statement from the above- (Mpemba) (a) Only 1 (b) Only 2 15. Study the following statements and choose the incorrect (c) Only 3 (d) None of these statement- 22. Choose the incorrect statement from the following state- (a) On adding salt to normal water, the boiling point ments- increases while the freezing point decreases. (a) The spread of greenhouse gases is promoting (b) On increasing pressure, the boiling point decreases. desertification (c) The boiling point increases in a cooker, that is why (b) In thermosflask, heat is not lost by conduction, con- food gets cooked quickly. vection and radiation (d) The value of latent heat of a solid is considered to (c) The temperature of the moon or a other body can be be 540 calories/gram. determined by Wien's displacement law 16. Study the following statements. (d) None of these 1. The conversion of a solid directly into a gas is called 23. Kelvin Planck said- sublimation. (a) The efficiency of a heat engine can be 100% 2. Sublimation is an exothermic reaction. (b) Absorption of heat from a heat reservoir and com- 3. Solid ice or solid CO2 sublimes at normal tempera- plete conversion of that heat into work is not possible ture. by any process 4. Solid iodine sublimes on heating. (c) There is no process which results in transfer of heat from a cold body to a hot body 5. The conversion of a gas directly into a solid is called (d) None of these deposition. 24. In cold regions, alcohol is preferred as a thermometer Which of the above statements is true? fluid instead of mercury because (a) Only 1,2, 3 (b) Only 1,3,4,5 (a) The freezing point of alcohol is very low (c) Only 4 and 5 (d) Only 1, 2, 3,4 (b) Alcohol is a better conductor of heat 17. Choose the wrong pair from the following pairs (c) Alcohol is cheaper than mercury. (a) Conversion of gas into plasma - Recombination (d) None of these (b) Conversion of liquid into gas - Evaporation 25. Choose the true statement from the following- (c) Conversion of gas directly into solid - Deposition (a) Heat always flows from a hot object to a cold object (d) Conversion of gas into liquid- Condensation (b) The breeze coming from the sea towards the land is 18. Choose the wrong pair from the following pairs. called a sea breeze. (a) Law of thermal equilibrium- Zeroth law of thermo- (c) Iron is a better conductor of heat than wood, so it dynamics becomes very cold in winter and very hot in summer. (b) Law of conservation of energy- Second law of ther- (d) None of these modynamics 26. Consider the following statements. (c) Law of direction of heat flow-Second law of thermo- Statement I In summer, the temperature contrast between dynamics continents and oceans is greater than in winter. (d) Relation of entropy- Third law of thermodynamics Statement II The specific heat of water is greater than the 19. The entropy of a perfectly crystalline substance at abso- specific heat of the Earth's surface. lute temperature Which one of the following is correct about the above (a) is zero standard (b) remains positive statements? (c) is negative (d) is irregular. (a) Both Statement I and Statement II are correct and 20. Study the following statements. Statement II is the correct explanation of Statement I. 1. Absolute humidity is measured in grams per cubic meter. (b) Both Statement I and Statement II are correct but 2. Hygrometer is used to measure relative humidity. Statement II is not the correct explanation of Statement I. 3. Relative humidity in saturated air is 100%. (c) Statement I is correct, but Statement II is wrong. 4. Condensation starts at 100% humidity. This is the (d) Statement I is wrong, but Statement II is correct. possibility of complete rainfall. 27. Thermostat is a device which Which of the above statements is correct- (a) measures heat (b) measures temperature (a) Only 1,2 and 3 (b) Only 2 and 4 (c) self-regulates the temperature of a system (c) Only 2 and 3 (d) All 1, 2, 3 and 4 (d) self-regulates the pressure of a system KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—4  28. When a glass rod is kept in steam, its length increases, 33. Fruits stored in a cold chamber last longer because but its width (a) sunlight is not allowed to fall (a) remains unaffected (b) decreases (b) concentration of carbon dioxide in the atmosphere (c) increases (d) becomes disorganized is increased 29. Water has maximum density at (c) rate of respiration is reduced (a) 373 Kelvin (b) 277 Kelvin (d) humidity is increased (c) 273 Kelvin (d) 269 Kelvin 34. In which of the following types of heat engines is a car- 30. The temperature point at which solid, liquid and gaseous burettor used? states can coexist is called (a) Diesel engine (b) Steam engine (a) Boiling point (b) Melting point (c) Petrol engine (c) Freezing point (d) Triple point (d) Both diesel and petrol engines 31. In which of the following conditions will wet clothes dry 35. Consider the following reasons for high specific heat the fastest? capacity of water. (a) 100% humidity, 60°C temperature 1. It is used in radiators of automobiles. (b) 100% humidity, 20°C temperature 2. It heats up much slower than land in summers. (c) 20% humidity, 20°C temperature 3. It cannot be used in a hot water bottle. Which of the (d) 20% humidity, 60°C temperature above statements is/are correct? 32. The safe temperature for keeping food fresh in a refrig- (a) 1 and 2 (b) 2 and 3 erator is (c) 1 and 3 (d) Only 2 (a) 4°C (b) 8°C (c) 0°C (d) 10°C Magnetism 01. Paramagnetic theory of magnet is represented by which 07. Choose the incorrect statement regarding Curie tempera- of the following? ture- (a) Nickel (b) Mercury (a) Madam Curie determined this temperature (c) Iron (d) Platinum (b) At this temperature paramagnetic materials turn into 02. In the magnetic field of the earth, the number of neutral ferromagnetic materials. points around a bar magnet placed with its north pole (c) Curie temperature of iron is 1121 °C facing the north direction is: (d) More than one of the above (a) 2 (b) 4 08. Water and human blood are examples of- (c) 6 (d) 5 (a) Diamagnetic (b) Paramagnetic 03. Choose the wrong statement with reference to magnet- (c) Ferromagnetic (d) None of the above (a) Magnetite is a natural magnet. 09. Which of the following involves the application of mag- (b) Similar poles of two magnets attract each other nets. (c) Unlike poles repel each other. (a) Washing machine and radio (d) When a bar magnet is suspended, it stays in the (b) MRI machine north-south direction. (c) Dynamo 04. Choose the wrong match from the following pairs (d) More than one of the above (a) Paramagnetic material - Titanium 10. The effective length of a magnet is 25 cm, find its geo- (b) Ferromagnetic material - Gadolinium metric length. (c) Diamagnetic material - Oxygen (a) 30 cm (b) 25 cm (d) None of the above (c) 20 cm (d) None of the above 05. Which one of the following pairs is not a diamagnetic 11. Choose the false statement from the following- material. (a) Both the poles of a magnet are not exactly on the (a) Tin and tungsten edges. (b) Marble and antimony (b) Both the poles of a magnet cannot be separated. (c) Zinc and copper (c) The north pole of a magnet is considered negative (d) None of the above while the south pole is considered positive. 06. Which one of the following pairs is a ferromagnetic ma- (d) None of the above terial. 12. Where is the position of least magnetism in a magnet? (a) Tungsten and lithium (a) At the North Pole (b) Cobalt and nickel (b) Exactly in the middle of both the poles (c) Gold and silver (c) At the South Pole (d) None of the above (d) None of the above KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—5  13. Choose the wrong statement from the following state- (b) 3 2 4 1 ments- (c) 4 3 1 2 (a) If a magnet is heated or dropped from a height, it (d) 3 4 1 2 loses its properties. 17. Eddy currents are used in which of the following? (b) Inside a magnet, the field lines run from north to 1. Magnetic brakes of trains south. 2. Induction furnace (c) Gauss is the SI unit of magnetic induction. 3. Tractor (d) None of the above 4. Electric power meter 14. Which device depends on the magnetic power of elec- Code tricity. (a) 1, 2 and 4 (b) 1, 2 and 3 (a) Fan (b) Telephone receiver (c) 2 and 4 (d) 2, 3 and 4 (c) Dynamo 18. Which of the following statements is true with respect to (d) More than one of the above electromagnets? 15. The conductivity and magnetization of an electromagnet 1. Those whose retentiveness is very low. are respectively 2. Those whose magnetization is very low. (a) Very low and very high 3. Those are used in cranes, telephone instruments, (b) Very high and very low sound amplifiers of electric bells, etc. Which of the above (c) Both are equal statements are true? (d) More than one of the above (a) 1 and 2 (b) 2 and 3 16. Match List-I and List-II and choose the correct answer (c) 1 and 3 (d) 1, 2 and 3 from the code given below the lists- 19. Which of the following statements is false with respect List-1 List-II to magnetic fields? A. Non-magnetic 1. Cobalt (a) Ion currents traveling along the nerve cells of the B. Magnus 2. Natural magnet human body produce magnetic fields. C. Magnetite 3. Greek (b) Magnetic field inside the human body helps in ob- D. Magnetic 4. Clay taining images of different parts of the body. Code:- (c) Magnetic field is not produced in the heart and brain. A B C D (d) Images of the human body are obtained by mag- (a) 4 3 2 1 netic resonance imaging technique. Light and Colour 1. Which type of lens is used in a magnifying glass 6. When light passes from one medium to another, which of (a) Concave / Concave the following does not change/changes? (b) Plane - Concave (a) Velocity (b) Wavelength (c) Convex lens (c) Frequency (d) Refractive index (d) Convex mirror 7. The velocity of electromagnetic waves is- 2. A person standing in front of a mirror sees his image (a) 3 × 108 m/s (b) 3 × 107 m/s bigger than himself, it means that the type of mirror is (c) 3 × 106 m/s (d) 3 × 105 m/s (a) Concave (b) Plane 8. The defect of vision 'nearsightedness' is known as- (c) Convex (a) Hypermetropia (b) Presbyopia (d) Cylindrical with bulge outwards (c) Glaucoma (d) Cataract 3. Twinkling of night stars can be explained by- 9. In a solar oven, the following is used- (a) Reflection of light (b) Refraction of light (a) Plane mirror (b) Concave mirror (c) Polarization of light (d) Interference of light (c) Convex mirror (d) Concave lens 4. When a soap film appears on water during the day, it 10. The range of solar radiation is shows beautiful colours. The reason for this phenom- (a) 100 - 400 nm (b) 400 -700 nm enon is. (c) 740 -1000 nm (d) None of the above (a) Diffraction of light (b) Interference of light 11. Seven colours of light can be separated. (c) Refraction of light (d) Polarization of light (a) By prism (b) By prefilter 5. Light year is the unit of- (c) By plants (a) Time (b) Speed (d) Colours cannot be separated (c) Distance (d) Intensity of light KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—6  12. Two plane mirrors are placed in a barber shop. ability to diverge is the power of the lens. (a) Parallel to each other (c) On combining the lenses, the image becomes mag- (b) Perpendicular to each other nified and clear (c) At an angle of 45 degrees (d) None of the above (d) At an angle of 60 degrees 21. An air bubble in water behaves like a 13. The vigilance mirror used in big showrooms, departmen- (a) Convex lens (b) Concave lens tal stores is- (c) Concave mirror (d) None of the above (a) Plane mirror (b) Convex mirror 22. Tyndall effect is produced by- (c) Concave mirror (d) Combination of con- (a) When sunlight passes through the canopy of dense cave and convex mirror forests 14. Nearsightedness is treated by- (b) When light is scattered by colloidal particles (a) Convex lens (b) Concave lens (c) When light is refracted by colloidal particles (c) Convex lens (d) Concave lens (d) More than one of the above 15. A person can see an object when- 23. Statement 1: A person with farsightedness can see dis- (a) When light falls only on the object tant objects clearly. (b) When light falls only on the eyes Statement 2: In farsightedness, the image of the object is (c) When light falls on the object and comes towards formed behind the retina. the eyes Statement 3: To correct farsightedness, spectacles with (d) None of the above concave lenses are used. 16. Which phenomenon represents refraction? Choose the false statement from the above- (a) Bending of a partially immersed pencil (a) Only 1 (b) Only 2 (b) Twinkling of a star (c) Only 3 (d) None of these (c) Rising of the bottom of a swimming pool 24. Statement 1: In case of nearsightedness, a person is un- (d) More than one of the above able to see distant objects clearly. 17. Which of the following statements can be wrong. Statement 2: In case of nearsightedness, the image of the (a) The rays of light do not become parallel after re- object is not formed on the retina but in front of it. flecting from a rough surface, this is called diffused re- Statement 3: The defect of vision can be corrected by flection. concave lens. Which of the above is a false statement. (b) The inner surface of a spoon acts like a concave (a) Only 1 (b) Only 2 mirror. (c) Only 3 (d) None of these (c) None of these 25. The image formed by an astronomical telescope is (d) More than one of these (a) virtual and large (b) virtual and small 18. Choose the wrong statement from the following statements- (c) real and small (d) None of these (a) The image formed by a concave mirror can be both 26. Statement 1: A concave lens is used in a telescope. State- virtual and real ment 2: A simple microscope is a converging lens of short (b) A convex mirror can form the image of a larger area focal length. of ??the scene. Statement 3: In a compound microscope, the objective (c) Convex mirror is used in a solar oven lens forms a real, inverted and magnified image of the (d) None of these object. Which statement is false? 19. Statement 1: A lens is a transparent medium surrounded (a) Only 1 (b) Only by two spherical surfaces. (c) Only 3 (d) None of these Statement 2: A convex lens is called a converging lens. 27. Study the following statements and choose the correct Statement 3: A concave lens is called a diverging lens. statement- Choose the wrong statement from the above statements- (a) The wavelength of light is small, hence its diffraction (a) Only 1 (b) Only 2 is also small. Therefore, it appears to move in a straight (c) Only 3 (d) None of these line. 20. Choose the wrong statement from the following state- (b) The speed of light in air depends on its optical density. ments- (c) Terrestrial heating and refraction of light are the (a) The power of a lens depends on its focal length. main causes of mirage (b) The rays of light are converged by a lens and the (d) None of these KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—7  28. Which has the highest velocity- 38. The fundamental particle of light is- (a) Light (b) Electron (a) Photon (b) Electron (c) Meteor (d) None of these (c) Leptons (d) None of these 29. The velocity of light will be highest in- 39. The nature of light is possible- (a) Diamond (b) Hydrogen (a) Only particle nature (c) Water (d) None of these (b) Only wave nature 30. The phenomenon of total internal reflection is possible (c) Both particle and wave nature when light travels- (d) None of these (a) From diamond to glass 40. Which of the following is not an example of wave nature- (b) From air to water (a) Photoelectric effect (b) Reflection of light (c) From water to glass (c) Polarization of light (d) None of these (d) None of these 41. Which statement is incorrect regarding the speed of light? 31. Study the following statements and choose the incorrect (a) Danish scientist Ole Roemer calculated the speed statement of light. (a) The speed of visible light in water is 0.75 times the (b) It takes only 8 minutes for the rays to reach the speed in vacuum. earth from the sun. (b) The persistence of vision is considered to be 1/16 (c) The speed of light in vacuum is determined to be second while the persistence of hearing is considered to 3×108 m/s. be 1/10 second. (d) None of the above (c) The colour of a star shows its temperature. 42. Which of the following radiations will have the highest (d) None of these energy per quantum? 32. Study the following statements and choose the true state- (a) 320 - 400 nm (b) 200-280 nm ment- (c) 400 - 600 nm (a) The colour of light depends on its wavelength. (d) None of the above (b) Red colour has the longest wavelength. (c) Blue light will have more energy than yellow light. 43. The range of solar radiation is: (d) More than one of these. (a) 100-400 nm (b) 400-700 nm 33. Choose the false statement from the following- (c) 780-1000 nm (d) None of the above (a) The sun and the moon appear elliptical near the 44. What is the difference between the actual sunset and the horizon because refraction is dominant. apparent time? Approximately how many minutes are there between virtual sunset (b) Yellow colour is in the middle of the rainbow. (a) 2 minutes (b) 8 minutes (c) A parabolic mirror is used in search light. (c) 30 minutes (d) None of these (d) None of these. 45. The power of a lens is measured by- 34. How should an umbrella be to protect from the sun? (a) Diopter (b) Dobson (a) White above, black below (c) Manometer (d) None of these (b) Just white-white (c) Black above, white below 46. After reaching the highest altitude or 100 km, Ramesh will see the color of the sky as- (d) None of these. (a) Black (b) Blue 35. When a plane mirror is angled then the angle of reflec- tion of the reflected ray will be - (c) White (d) None of these (a) 4 (b) 2 47. How would Neil Armstrong and Buzz Aldrin have seen the color of the sky after reaching the moon? (c) /2 (d) None of these (a) Light blue (b) Dark black (e) More than one of these (c) Light black (d) None of these 36. In which direction will the rainbow be visible at 12 noon? 48. Colour of light is determined by (a) East (b) West (a) Amplitude (b) Intensity (c) North and South (d) None of these (c) Wavelength (d) None of these 37. When a beam of red, blue and green light falls at one place simultaneously then the resultant light will be 49. Brightness of light is determined by- (a) Violet (b) White (a) Intensity (b) Wavelength (c) Magenta (d) None of these (c) Amplitude (d) None of these KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—8  50. Which principle will be applicable in optical fibre cable- 57. Thought 1: Twinkling of stars in the sky (a) Total internal reflection of light Thought 2: Size of the sun in the morning twilight (b) Refraction of light Thought 3: A coin lying in water appearing raised Which (c) Reflection of light (d) None of these of the above is an example of optical illusion- 51. If light is passed through a prism, which colour will be (a) Only 1 (b) Only 2 deflected the most? (c) Only 3 (d) More than one of these (a) Red (b) Orange 58. Which physical phenomenon is responsible for the for- (c) Green (d) None of these mation of rainbow? 52. According to the quantum theory of light, the nature of (a) Total internal reflection light is- (b) Dispersion of colours (a) Like a particle (c) Refraction (b) Like a particle and a wave (d) More than one of these (c) Neither like a particle nor like a wave 59. Statement 1: Spontaneous emission of light by an object (d) None of these Statement 2: Reflection of light by an object 53. Study the following statements- Statement 3: Refraction of light Statement 1: Applying makeup on the face, polishing Which of the above phenomena cannot be responsible boots and polishing your car refer to the phenomenon of for being able to see an object? reflection of light. (a) Only 1 (b) Only 2 Statement 2: The periscope machine follows the princi- (c) Only 3 (d) None of these ple of refraction of light. 60. If a very small opaque object is placed in the path of Statement 3: The back mirror in a barber shop in which light, then also the light bends from the edges and moves we see the hairstyle behind us is an example of multiple forward. This phenomenon is called. reflection. Choose the wrong one from the above state- ments- (a) Diffraction of light (b) Interference of light (a) Statement 3 only (b) Statement 1 only (c) Reflection of light (d) None of these (c) Statement 2 only (d) None of these 61. Which phenomenon is not related to light diffraction- 54. Consider the following- (a) Light waves coming down after filtering through Thought-1 Reflection clouds Thought-2 Refraction (b) Light moving forward through the windows of the house Thought-3 Diffraction Which is responsible appering object (c) The red colour of the sun reaching us directly (a) Only thought 1 (b) Only thought 2 (d) None of these (c) Only thought 3 (d) None of these 62. The angle of incidence is equal to the angle of reflection, 55. Study the following statements and choose the false state- the incident ray and the reflected ray are all on the same ment plane, this phenomenon is possible- (a) We can see objects only when light falls on the (a) Reflection of light (b) Refraction of light object and comes towards the other side. (c) Diffraction of light (d) None of these (b) Spots and pits appear on the moon due to diffused 63. Which condition is not necessary for the phenomenon reflection. of total internal reflection? (c) A translucent object allows all parts of the light to (a) The ray travels from rarer to denser medium pass through it. (b) The ray travels from denser to rarer medium (d) None of these (c) The value of angle of incidence is always greater 56. Study the following statements and choose the false state- than the value of critical angle ment- (d) None of these (a) Images can be different from shadows. 64. Which of the following denser mediums has the highest (b) The refractive index of the atmosphere changes due value of critical angle- to change in temperature. Therefore, due to multiple re- (a) Diamond (b) Water fraction, stars appear twinkling. (c) Glass (d) None of these (c) The visibility of the moon in the morning and also 65. Which of the following is not an example of total internal the Pole Star in the sky is a phenomenon of optical illu- reflection. sion or refraction of light. (a) Optical fibre cable (b) Endoscopy (d) None of these (c) Sonography (d) Laproscopy KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—9  66. Which of the following phenomena is a phenomenon of (c) Reflection of light positive interference- (d) None of these (a) Shining of soap bubbles 76. Rainbow is formed when sunlight falls on raindrops. (b) Shining of oil droplets spread on water Which of the following physical phenomena is responsi- (c) Shining of light falling on glass ble for this. (d) None of these (a) Dispersion 67. Choose the wrong one from the following pairs- (b) Refraction (a) Using red colour in danger sign Scattering of light (c) Internal reflection (b) Sun appearing red at sunrise and sunset Atmos- (d) More than one of the above pheric refraction - 77. Select the wrong statement regarding halo effect in the (c) Sun/sky appearing white at noon Diffraction of light context of the sun (d) More than one of these (a) It is an optical phenomenon due to the ice cubes present in the cirrus clouds. 68. Which of the following phenomena is related to CV Raman. (b) It is also called 22° (degree) orbit. (a) Scattering of light (b) Interference of light (c) This is the phenomenon of refraction, reflection and (c) Refraction of light (d) None of these scattering of light. 69. Which of the following light colours will scatter the most (d) More than one of these (a) Violet (b) Yellow 78. For a person to see the full image, a plane mirror must be (c) Red (d) None of these at least- 70. Choose the odd one out of the following pairs (a) equal to the height of the person (a) Orange colour of black box Scattering of light (b) one fourth of the height of the person (b) Shoe polish and glitter Reflection of light (c) half of the height of the person (c) 3D glasses Polarisation of light (d) none of the above (d) Bending of light from edges Reflection 79. Convex mirror is used in- 71. Which phenomenon is not a phenomenon of light scat- (a) back and side mirror of a car tering? (b) reflective lamps on roads (a) The sky appears blue (c) security device near ATMs (b) Twinkling of stars (d) more than one of the above (c) The sun appears red at sunrise and sunset 80. Convex mirror can be used in- (d) None of these (a) sunglasses 72. Mirage is caused by- (b) making magnifying lenses (a) Interference of light (c) parking lots and road safety (b) Total internal reflection (d) more than one of the above (c) Polarization of light 81. Red shift in Doppler effect means (d) None of these (a) Source moving away from the observer 73. Choose the wrong statement regarding primary rainbow- (b) Source coming closer to the observer (a) Comparatively brighter (c) Stationary position of source and observer (b) Red colour is at the top (d) None of these (c) Violet colour is at the top 82. Choose the wrong statement regarding concave mirror- (d) None of these (a) In this, reflection takes place from the inwardly 74. When will a 'rainbow' not be formed- curved surface. (a) When the sun is behind our back (b) In this, a virtual, straight and small image is formed. (b) When the sun is in front of our eyes (c) Dentists use concave mirror. (c) When it has rained (d) None of these (d) None of these 83. Concave mirror is not used in- 75. On which light principle does the 'bomb-disposal squad' (a) Solar furnace work- (b) Solar furnace and satellite dish (a) Total internal reflection (c) Sun glasses and street lights (b) Refraction (d) Torches and headlights of vehicles KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—10  84. Study the following statements and choose the correct 91. The light energy emanating from the sun can be dis- statement- persed by (a) Concave mirror is used to obtain a powerful parallel (a) A shower of raindrops beam of light. (b) A plane mirror (b) Larger image of the face can be seen by using con- (c) A convex mirror cave mirror. (d) None of the above (c) Concave mirror is used to concentrate sunlight to 92. A plane mirror can (in the context of light)- produce heat in solar ovens. (a) Reflect (b) Diverge (d) More than one of these. (c) Converge (d) None of the above 85. With the help of which mirror, the full image of tall trees, 93. Concave mirror is used in headlights of vehicles because- Qutub Minar or Burj Khalifa building can be seen easily. (a) It forms parallel beam (a) Convex mirror (b) Concave mirror (b) It spreads the light all around (c) Plane mirror (d) None of these (c) It does not allow light to be absorbed 86. Choose the wrong statement from the following state- ments- (d) None of these (a) Concave mirror is also called converging mirror be- 94. If the image of an object formed by a plane mirror is cause under its influence the rays meet at a point focus. virtual, vertical and magnified, then the object will be set (b) Convex mirror is also called diverging mirror. Be- (a) Between the pole and principal focus of the mirror cause it has the property of spreading the light rays. (b) At the principal focus (c) The reflecting surface of a convex mirror is raised. (c) At the centre of curvature (d) None of these (d) None of these 87. Which type of example is converging? 95. The refractive index of any other liquid medium with re- (a) Concave mirror and convex lens spect to air will be related to (b) Concave mirror and concave lens (a) Colder than one (b) Always zero (c) Convex mirror and concave lens (c) Colder than one (d) None of these (d) None of these 96. When light enters from a rarer medium to a denser me- dium, the velocity of light- 88. No matter how far you are standing from a mirror, your image will always appear straight. (a) Gradually increases (a) Plane mirror (b) Convex mirror (b) Decreases (c) Concave mirror (c) First decreases then increases. (d) More than one of these (d) None of these 89. Study the following statements with reference to plane 97. Statement 1: Real image can be obtained on a screen. mirror and choose the wrong statement. Statement 2: Real image is inverted in nature. (a) In the image formed by a plane mirror, the left side of Statement 3: Real images are obtained only in unmagnified the object appears as the right side of the image and the nature. right side of the object appears as the left side of the Choose the wrong statement from the above image. (a) Statement 1 (b) Statement 2 (b) It is possible to use a plane mirror in a periscope and a kaleidoscope. (c) Statement 3 (d) None of these (c) A large-sized image is also possible on a plane mir- 98. Why do we see green colour in green pass? ror. (a) It reflects green colour (d) None of these (b) It reflects and scatters other colours except green 90. A person is coming towards a plane mirror at a speed of (c) It absorbs green colour and then shines 5 m/s. At what speed will the person see his image com- (d) None of these ing. 99. Choose the correct statement from the following statements (a) 10 m/s and in the direction of the person's motion (a) Parabolic mirror is used in solar cooker. (b) 5. m/s and opposite to the direction of the person's motion (b) The phenomenon of splitting of white light into (c) 10 m/s and opposite to the direction of the person's seven colours is called dispersion of light. motion (c) The clear vision of human eye (minimum) is 25 cm. (d) None of the above (d) None of these KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—11  100. The phenomenon of photosynthesis is possible by the 2. If an object is placed between the pole (P) and fo- invisible part of sunlight (infrared radiation) in- cus (F), then the image on the concave mirror is virtual (a) bacteria (b) virus and straight behind the mirror and is larger in size than (c) fungus (d) none of these the object. 101. Study the following statements- 3. When the refractive index (RI) of the medium be- comes more than that of the lens, then the behaviour of 1. If an object is placed on a concave mirror at the the lens changes. centre of curvature (c), then its image is also formed at the centre of curvature (c) inverted and of the same size Which of the above statements is true- as the object. (a) Only 1, 2 (b) Only 1, 3 (c) All 1, 2 and 3 (d) Only 2, 3 Sound And Wave 01. Study the following statements- (b) As human children grow up, their ears become less 1. Medium is required for sound transmission- sensitive to high frequencies. 2. Sound waves are an example of longitudinal waves (c) The normal sound range of human ear is consid- 3. The distance between any two troughs or crests is ered to be 20 Hz to 20 kHz. called wavelength. Its unit is meter- (d) The best hearing sensitivity of human ears is con- Which of the above statements is true- sidered to be 1000-5000 Hz. (a) Only 1, 2 (b) Only 2, 3 Choose the incorrect statement from the above statements (c) Only 3 (d) 1, 2, 3 all true (a) Only 1, 2 (b) Only 2 and 3 02. Study the following statements and choose the false state- (c) Only 1, 3, 4 (d) None of the above ment 06. Study the following statements and choose the incorrect (a) There is an inverse relationship between time period one- and frequency (a) Elephants, whales, rhinoceros, giraffes, horses, oc- (b) If the frequency of sound is high, it means that the topuses, etc. are capable of hearing infrasonic sound. pitch of that sound will be low (b) Earthquakes can produce infrasonic sound signals (c) It is believed that when the sound is soft or slow, its in various ways. amplitude will be low (c) Migratory birds use ultrasonic signals during their (d) Louder sound travels a greater distance. journey. 03. Study the following statements (d) Seismic P-waves are longitudinal while S-waves are 1. The speed of sound in a medium is actually affected examples of transverse waves. by the temperature of the medium. 07. Study the following statements with reference to ultra- 2. When sound enters from a liquid to a gas, it slows down. sonic waves- 3. Reflection of sound is possible from both solid sur- 1. Dolphins, bats, dogs, cats, porpoises, rats, etc. are faces and liquid surfaces- sensitive to ultrasonic sound. 4. Sound has less possibility of diffraction. Which of the 2. Using this, dirt present at high altitudes can be above statements is true cleaned. (a) Only 1, 2, 3 (b) Only 1, 3, 4 3. They are used in electrocardiography (ECG), ultra- sonography, and other treatment methods. Choose the (c) Only 2, 3, 4 (d) All 1, 2, 3, 4 true statement from the above - 04. Which of the following does not show multiple reflection (a) Only 1, 3 (b) Only 2, 3 of sound (c) Only 1, 2 (d) All 1, 2, 3 (a) Listening to sound in a stethoscope, sound of a megaphone 08. Choose the wrong pair from the following pairs (b) Sound of a clarinet and a trumpet (a) Normal conversation 40 — 50 decibels (c) Loud horns, curving the ceilings of cinema halls (b) Whispering 15— 20 decibels and concert halls (c) Breathing sound 30— 40 decibels (d) Periscope and kaleidoscope (d) Acceptable sound of firecrackers— 125 decibels 05. Study the following statements - 09. Which of the following pairs is wrong- (a) Children below 5 years of age and some animals like (a) WHO's ideal sound standard— 75 db dogs etc. can hear sound up to 25 KHz. (b) Harmful state of sound— 80 db KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—12  (c) Mosquito sound right near the ear 25— 30 db 17. Study the following statements and choose the incorrect (d) Rustle of leaves 10— 20 db statement- 10. Study the following statements (a) Passive sonar system emits sound signals into water. (a) The unit of sound intensity is considered to be (b) Sodar is a meteorological instrument, which meas- microwatt per meter2. ures the turbulence of the weather. (b) Doppler effect is effective for both sound and light (c) Biological sonar is used in dolphins, toothed whales (c) Echo is not considered good in sonar system- Which and bats etc. of the above statements is true- (d) 5 Mach means five times the speed of sound (a) Only 1, 2 (b) Only 2, 3 18. Which option is not for transverse waves- (c) Only 1, 3 (d) All 1, 2, 3 (a) Light waves 11. Study the following statements and choose the wrong (b) Heat waves and radio waves statement- (c) Water waves and S-waves (a) The ceilings of cinema halls are made curved to (d) Sound waves and P-waves avoid reverberation. 19. Which option is not for the longitudinal waves- (b) Women and birds have high pitched voice. (a) Spring waves (b) Vibrating drum (c) To hear a clear echo of any sound, there should be (c) Sound waves (d) String waves a gap of at least 0.1 seconds between the original sound 20. Study the following statements- and the reflected sound. 1. We cannot have normal conversation on the moon- (d) The quality of sound depends on its wave form. 2. The speed between 1 to 5 Mach is called super- 12. Which of the following examples explains interference of sonic. sound- 3. Shock waves are generated only when the speed is (a) Beat or beat (b) Tone more than 5 Mach. (c) Voice (d) Noise Choose the true statement from the above- 13. If the size of vocal cord is large, then the sound will have- (a) Only 1, 2 (b) Only 2, 3 (a) Wavelength more (c) Only 1, 3 (d) 1, 2, 3 All (b) Frequency more 21. Study the following statements- (c) Pitch more 1. Both transverse and longitudinal waves can be gen- (d) Wavelength erated on the upper surface of water. 14. It becomes possible to identify the sounds of guitar, flute, 2. Longitudinal waves have crests and troughs. sitar etc. separately by- 3. Compression and rarefaction are obtained in trans- (a) Pitch of sound verse waves. (b) Intensity of sound 4. Polarization is not possible in longitudinal waves. (c) Loudness of sound Choose the true statement from the above statements- (d) Quality of sound (a) Only 1, 2 (b) Only 1, 4 15. Study the following statements- (c) Only 2, 3 (d) Only 2, 4 (a) Doppler effect is possible only in longitudinal waves 22. What proves that light is a transverse wave- (b) Doppler effect can be used for satellite navigation, (a) By the property of polarization robot operation, radar etc. (b) By the property of reflection (c) Blue shift means Doppler effect indicates that the (c) By the property of interference source is coming closer. (d) By the property of diffraction Which of the above statements is correct. 23. Which phenomenon is not possible in longitudinal (a) Only 1, 3 (b) Only 2 waves- (c) Only 2, 3 (d) Only 1, 2, 3 (a) Reflection (b) Refraction 16. Which of the following pairs is incorrect. (c) Polarization (d) Diffraction (a) Marching of soldiers on the bridge Resonance 24. Which pair will not have any effect on the speed of sound- (b) Barrier of sound Bending from the edges Diffrac- (a) Temperature and humidity tion system (b) Pressure and frequency (c) Laying carpet in a large hall— Reducing (c) Density and speed of air reverberation (d) None of these (d) Infrared waves Sonar — KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—13  25. Which of the following groups is related to 'ultrasonic'- (e) None of the above More than one of the above (a) Octopus, pigeon, cuttlefish 8. The electrolyte in a normal dry solution is- (b) Rhinoceros, hippopotamus, elephant (a) Zinc (b) Sulfuric acid (c) Frog, toad, bat (c) Ammonium chloride (d) Manganese dioxide (d) None of these 9. With which instrument is electric current measured? 26. Choose the correct statement from the following state- (a) voltmeter (b) Ameater ments- (c) voltmeter (d) Potentiometer (a) There is a direct relationship between the pitch of (e) None of the above More than one of the above sound and the intensity of sound 10. which material is the wire generally used for install- (b) The pitch of a mosquito's buzzing is higher than the ing safety fuses? pitch of a lion's roar (a) Tin (c) The principle of echo is applicable in sonar, ultra (b) lead sound and underwater exploration. (c) nickel (d) None of these (d) An alloy of tin and lead 27. In which of the following options, sound cannot pass 11. On what does the speed of the fan depend? through. (a) voltage (b) Metal (a) Water (b) Hard steel (c) Aluminum in fan (d) Iron in fan (c) Vacuum (d) None of these 12. High voltage grid is used to transmit electricity be- cause- Electricity (a) Current is more. (b) Power loss is high. 1. The unit of electric current is- (c) Resistance is less. (d) Heat loss is less. (a) Coulomb (b) volt 13. The process of bringing one conductor close to an- (c) watt (d) ampere other charged conductor without making contact with (e) None of the above More than one of the above another charged conductor is called- 2. 'Ohm meter' is the unit (a) induction (b) movement (a) resistance (b) conductivity (c) convection (d) radiation (c) resistance (d) charge (e) None of the above More than one of the above (e) None of the above More than one of the above 14. Electricity consumption bill is based on whose meas- 3. The unit of electrical power is urement? (a) ampere (b) volt 1. Watt 2. Voltage (c) Coulomb (d) watt 3. Iron 4. ampere (e) None of the above More than one of the above Choose your answer from the following codes- 4. In which of the following ways can 1 volt be ex- (a) Only 1 (b) 1 and 2 pressed? (c) 2 and 3 (d) 1 and 4 (a) 1 joule per coulomb 15. The two bulbs in a house, one is brighter (gives more (b) 1 coulomb per joule light) than the other. Which of these two bulbs has (c) 1 joule-coulomb higher Is it a Resistance? (a) In a dimly lit bulb. (d) 1 joule-coulomb per second (b) In a bulb with more light. 5. The unit of electric power is- (c) The resistance in both the bulbs is equal. (a) ampere (b) volt (d) The intensity of light does not depend on the (c) Coulomb (d) watt barrier. (e) None of the above/More than one of the above 16. Transformer is used for which of the following pur- 6. If a 100 watt electric bulb burns for 10 hours, the poses It happens? electricity cost will be- (a) To convert alternating current into direct cur- (a) 0.1 unit (b) 1 unit rent. (c) 10 units (d) 100 units (b) To convert direct current into alternating cur- 7. The total resistance of a circuit with two parallel rent. resistors is 1.403 kilo-ohms. If the value of one re- (c) To raise or lower the alternating current poten- sistor is 2.0 kilo-ohms, then the value of the other tial resistor will be- (d) To increase the direct current potential (a) 1.403 kilo-ohms (b) 2.0 kilo-ohms 17. There is a mobile charger (c) 3.403 kilo-ohm (d) 4.70 kilo-ohms (a) An inverter (b) A U.P.S. KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—14  (c) A step-up transformer (a) To reduce expenses (d) A step-down transformer (b) Because the equipment works in 3-phase 18. Which of the following is showing the increasing (c) for security order of electricity consumption? (d) As a fuse (a) Television, fan, electric press, electric kettle 27. Statement (A) and reason (R) are given below. Study (b) Television, fan, electric kettle, electric press and select the correct answer from the codes given (c) Fan, television, electric press, electric kettle below: Statement (A): Lightning conductors protect (d) Electric press, electric hook, fan, television buildings from destruction. Reason (R): They send 19. What is alternating current not suitable for? charge to the earth. (a) To charge the storage battery Code : (b) To drive an electric motor (a) Both (A) and (R) are correct, and (R) is the (c) For transmission of electrical power correct explanation of (A). (d) To heat the electric toaster (b) Both (A) and (R) are correct, but (R) is not the 20. If the electric current and potential difference flow- correct explanation of (A). ing in a wire are each increased twice, then the (c) (A) is correct, but (R) is wrong. electric power- (d) (A) is wrong, but (R) is correct. (a) will not be affected 28. Consider the following statements regarding motor (b) will increase four times car battery (c) will increase two times 1. The voltage is generally 12 volts. (d) will be reduced to half 2. The electrolyte used is hydrochloric acid. (e) none of these 3. The electrodes are lead and copper. 21. In the context of street lighting, sodium lights, L.E.D 4. Capacitance is expressed in ampere hour. Suit- How are they different from lights? able 1. Sodium lights produce light in 360 degrees; But Which of the statements are correct? L.E.D. This does not happen in lights. (a) 1 and 2 (b) 2 and 3 2. As street lights, L.E.D. Compared to conventional (c) 3 and 4 (d) 1 and 4 lamps, sodium lamps have a longer life span. 29. Nickel Cadmium (Ni-Cd) battery is used for- 3. The spectrum of visible light of sodium lamp is (a) Calculator almost monochromatic, whereas that of L.E.D. (b) Cordless electronic devices The lights provide significant color advantage (c) transistor in street lighting. (d) All of the above Select the correct answer using the code given be- 30. How will more light be obtained by connecting two low. identical bulbs? (a) only 3 (b) only 2 1. Both are connected in series order (c) 1 and 3 only (d) 1, 2 and 3 2. Both are connected in parallel. 22. Which gas is inside the electric bulb? Select the correct answer using the code given be- (a) oxygen (b) air low- (c) carbon dioxide (d) None of the above Code 23. Which gas is filled in the fluorescent tube (fluores- (a) More than 1 (b) more than 2 cence bulb)? (c) Same in both 1 and 2 (a) Neon (b) Sodium (d) nothing can be said (c) Mercury (d) Mercury and Neon 31. In a tunnel, five bulbs of 100 watt capacity are lit 24. Which gas is present in normal tube light? continuously for 20 hours. the total electricity con- (a) Sodium vapor with argon sumption will be (b) Sodium vapor with neon (a) one unit (b) two units (c) Mercury vapor with argon (c) ten units (d) twenty units (d) Mercury vapor with neon 32. Which of the following uses is not primarily based 25. What is the order of magnitude of electrical resist- on Coulomb's law? ance of human body (dry)? (a) To establish understanding of nuclear forces (a)  (b)  (b) Putting the balloon on the wall without glue (c)  (d)  (c) Working of Xerox machine 26. Earth is used in electrical appliances (d) In wiring houses KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—15  33. The solar panel installed on the roof of the school 35. The total number of cells present in a 12 volt bat- building is capable of generating only 1.8 kwh en- tery will be- ergy per day; Electricity produced by solar panels (a) 6 (b) 3 in the month of April. (c) 4 (d) 9 (a) 18 kW (b) 36 kW 36. What will happen if the charging rate of what ef- (c) 54 kW (d) 72 kilowatts fect the battery is too high? 34. For maximum power consumption, the resistors of (a) Excessive gas will be formed resistance should be connected in- (b) the temperature will increase (a) series (b) Parallel (c) Bulging and shrinking is possible in the plates (c) Both A and B (d) None of the above (d. All of the above  KGS Campus Patna –6 Mob. : 8877918018, 8757354880 KGS—16