Section – A: 1. The number of significant figures in 0.06900 — a. 2 b. 4 c. 6 d. 5
2. The dimension of light year is a. T b. L?−1 c. L d. ?−1
3. Which one of the following pairs of quantities has the same dimensions? a. Force and work done b. Momentum and impulse c. Pressure and force d. Time period and frequency
4. At the upper most part of a projectile ,velocity and acceleration are at an angle of – a. 0 degree b. 30 degree c. 180 degree d. 90 degree
5. When the distance travelled by a body is proportional to the time taken. Its speed a. Remains unchanged b. Becomes zero c. Increases d. Decreases
6. The linear velocity of a body rotating at ω rad/s along a circular path of radius r is given by a. ωr b. ω/r c. 2ωr d. 3ω/r
7. Two vectors ,both equal in magnitude have their resultant equal in magnitude of either.The angle between these vectors will be a. 90 degree b. 0 degree c. 120 degree d. 180 degree
8. What is the ratio of the moment of inertia of two rings radii r and nr about an axis perpendicular to their plane and passing through their centres a. 1: 2n^2 b. 2n^2 :1 c. 1: n^2 d. n^2 :1
9. A boy standing on a rotating disc stretches out his hands ,the angular speed will a. Decrease b. Increase c. Will not change d. None of the above
10. A bullet of mass m moving with a speed v strikes a wooden block of mass M & gets embedded into the block.The final speed is a. ?/?+? v b. ?/2?+? v c. ?/ ?+2? v d. 2? / ?+? v
11. During inelastic collision between two bodies,Which of the following quantities always remain conserved. a. Total kinetic energy b. Total potential energy c. Total linear momentum d. None of the above
12. A particle is projected at an angle of 60 degree to the horizontal with a kinetic energy E.The K.E at the highest point is a. E/2 b. E/4 c. E/3 d. 2E
13. According to work-energy theorem,the work done by the net force on a particle is equal to the change in its a. linear acceleration b. Potential energy c. linear momentum d. Kinetic energy
14. Swimming is possible on account of a. Third law of motion b. First law of motion c. Second law of motion d. Force of Gravitation
15. A body whose momentum is constant must have constant a. velocity b. force c. acceleration d. none of the above
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