set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

When a stone tied to a string is whirled in a circle, the work done on it by the string is

a) zero

b) negative

c) positive

d) undefined

Question : 2

In case of negative work the angle between the force and displacement is

a) 90°

b) 45°

c) 0°

d) 180°

Question : 3

The circular motion of a particle with constant speed is

a) periodic and simple harmonic

b) periodic but not simple harmonic

c) simple harmonic but not periodic

d) neither periodic nor simple harmonic

Question : 4

A passenger in a moving train tosses a coin. If the coin falls behind him, the train must be moving with

a) a uniform speed

b) a deceleration

c) an acceleration

d) any of the above

Question : 5

A balloon filled with CO₂ released on earth would (neglect viscosity of air)

a) fall with a constant acceleration 3.4 m/s²

b) fall with an acceleration 9.8 m/s²

c) climb with an acceleration 9.8 m/s²

d) fall with acceleration and then would attain a constant velocity

Question : 6

The relative velocity v_AB or v_BA of two bodies A and B may be

1. greater than the velocity of body A
2. greater than the velocity of body B
3. less than the velocity of body A
4. less than the velocity of body B

a) (1), (2) and (3) only

b) (3) and (4) only

c) (1) and (2) only

d) (1), (2), (3) and (4).