mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 26

If suddenly the gravitational force of attraction between the earth and a satellite revolving around it becomes zero, then the satellite will

a) become stationary in its orbit

b) move tangentially to the original orbit with same speed

c) continue to move in its orbit with same speed

d) move towards the earth

Question : 27

Consider the following statements : If there were no phenomenon of capillarity

1. it would be difficult to use a kerosene lamp
2. one would not be able to use a straw to consume a soft drink
3. the blotting paper would fail to function
4. the big trees that we see around would not have grown on the Earth

a) 2 and 4 only

b) 1, 2 and 3 only

c) 1, 3 and 4 only

d) 1, 2, 3 and 4

Question : 28 [CDS]

Statement A :
When a gun is fired it recoils, i.e., it pushes back, with much less velocity than the velocity of the bullet.
Statement B :
Velocity of the recoiling gun is less because the gun is much heavier than the bullet.

a) Both statements are correct.

b) Statement B is correct.

c) Statement A is correct.

d) Both statements are incorrect.

Question : 29 [IAS Prelim]

Ball bearings are used in bicycles, cars, etc., because

a) the effective area of contact between the wheel and axle is reduced

b) the effective area of contact between the wheel and axle is increased

c) the actual area of contact between the wheel and axle is increased

d) None of the above statements is correct

Question : 30

The maximum kinetic energy of a planet moving around the sun is at a position

a) C

b) B

c) A

d) D