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

Question : 26

A person swims in a river aiming to reach exactly on the opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle of 120º with the direction of flow of water. The speed of water is

a) 0.25 m/s

b) 0.5 m/s

c) 1.0 m/s

d) 0.43 m/s

Question : 27

For inelastic collision between two spherical rigid bodies

a) the linear momentum is not conserved

b) the total mechanical energy is not conserved

c) the total kinetic energy is conserved

d) the linear momentum is conserved

Question : 28

Frictional force

a) may act in the direction of motion

b) always acts in the direction of motion

c) always acts opposite to the direction of motion

d) always acts perpendicular to the direction of motion

Question : 29

Consider the following statements:
A 4-wheel vehicle moving in a sharp circular path at high speed will :

1. overturn about its outer wheels
2. overturn about its inner wheels
3. skid outwards
4. skid inwards

a) 2 and 3

b) 1 and 3

c) 2 and 4

d) 1 and 4

Question : 30 [CDS]

Statement A:
Pulling a lawn roller is easier than pushing it.
Statement B :
Pushing increases the apparent weight and hence the force of friction.

a) Both statements are correct.

b) Statement B is correct.

c) Statement A is correct.

d) Both statements are incorrect.