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

Question : 21 [IAS (Pre) 2003]

What is the correct equation for finding the acceleration?

a) a = ${v + u}/t$

b) a = u + vt

c) a = ${v - u}/t$

d) a = ${v + u}/2$

Question : 22

A large truck and a car, both moving with a velocity of magnitude v, have a head-on collision. If the collision lasts for 1 s, which vehicle experiences a greater change in momentum?

a) Both have the different changes in momentum

b) Both have the same change in momentum

c) Car has more change in momentum than truck

d) Truck have more change in momentum than Car

Question : 23

When a body is stationary

a) the combination of forces acting on it balances each other

b) the force acting on it not in contact with it

c) there is no force acting on it

d) the body is in vacuum

Question : 24

Which of the following is NOT an illustration of Newton's third law ?

a) Walking on floor

b) A cricket player lowering his hands while catching a cricket ball

c) Flight of a jet plane

d) Rebounding of a rubber ball

Question : 25

A ball is dropped from a satellite revolving round the earth at a height of 120 km. The ball will

a) fall down to earth gradually

b) continue to move with the same speed along the original orbit of satellite.

c) continue to move with same speed along a straight line tangentially to the satellite at that time.

d) go far away in space