| 1. | The speed (v) of a body varies with time (t) as v=atē+bt+c, where a, b and c are positive constants of motion. This relation suggests that the body has: |
| a. | | A constant acceleration |
| b. | | A constant retardation |
| c. | | A variable acceleration |
| d. | | A variable retardation
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| 2. | If the kinetic energy of a body is decreased by 36%, the percentage decrease in the linear momentum will be: |
| a. | | 12% |
| b. | | 20% |
| c. | | 28% |
| d. | | 36%
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| 3. | Two bodies of masses 1kg and 4kg have equal kinetic energies. The ratio of their linear momenta is: |
| a. | | 1/2 |
| b. | | 1/4 |
| c. | | 1/8 |
| d. | | 1/16
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This question is based upon the figure shown below
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| 4. | Two skaters A and B with masses 50 kg and 70 kg respectively, stand 6 meters apart facing each other on a horizontal smooth surface. They pull on a rope stretched between them. How far does each skater move when they meet? |
| a. | | Both A and B move 3 meters |
| b. | | A moves 4 meters and B 2 meters |
| c. | | A moves 2.5 meters and B 3.5 meters |
| d. | | A moves 3.5 meters and B 2.5 meters
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| 5. | When a ship enters a sea from river, it rises a little because: |
| a. | | Density of sea water is less than that of river water |
| b. | | Sea is deeper than river |
| c. | | Sea has more water than river |
| d. | | Sea water being denser than river water, exerts a greater upthrust on the ship
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| 6. | A simple pendulum has frequency of oscillation equal to f. It is therefore taken to a certain height above the ground and then dropped along with its support so that it falls freely under gravity. The frequency of the falling pendulum will:
a)Remain equal to f |
| b. | | Become greater than f |
| c. | | Become less than f |
| d. | | Zero
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| 7. | A simple pendulum has a time period T. If it is taken to the moon (where the acceleration due to gravity is one tenth that on the earth), its time period will: |
| a. | | Remain equal to T |
| b. | | Become 6T |
| c. | | Become 2.44T |
| d. | | Become T/2.44
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| 8. | A heavy metal sphere is suspended from a spring. When pulled down a little and released, it oscillates up and down with time period T. If it is taken to the moon (where acceleration due to gravity is one-sixth that on earth), the time period of vertical oscillation will: |
| a. | | Remain equal to T |
| b. | | Become 6T |
| c. | | Become 2.44T |
| d. | | Become T/2.44
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| 9. | The atmospheric pressure on earth is due to |
| a. | | The gravitational exerted on earth by the moon |
| b. | | The gravitational force exerted on earth by the sun |
| c. | | The weight of all the air in the earth's atmosphere |
| d. | | The weight of the ionized gases in the ionosphere
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This question is based upon the figure shown below
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| 10. | From a source, heat is supplied at a constant rate to a solid cube. The variation of temperature of the cube with the heat supplied is shown in the above figure. The portion DE of the graphs represents conversion of: |
| a. | | Solid into liquid |
| b. | | Liquid into vapor |
| c. | | Solid into vapor |
| d. | | Vapor into solid
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| 11. | Which of the following optical devices should be used to obtain a parallel beam of light from a tiny source of light? |
| a. | | Convex mirror |
| b. | | Concave mirror |
| c. | | Plane mirror |
| d. | | Concave lens
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| 12. | Mach number is used in connection with the speed of: |
| a. | | Sound |
| b. | | Aircraft |
| c. | | Spacecraft |
| d. | | Ships
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