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

Question : 16

A fan is moving around its axis, What will be its motion regarded as ?

a) Skidding

b) Rolling with shipping

c) Pure rolling

d) Pure rotation

Question : 17

A coin is placed on a rotating disc and is stationary w.r.t. the disc, then the direction of friction is

a) towards the centre of the disc

b) opposite to the direction of motion of the coin w.r.t. ground

c) along the direction of motion of the coin w.r.t. ground

d) away from the centre of the disc

Question : 18

If a running boy jumps on a rotating table, which of the following is conserved?

a) Angular momentum

b) K.E

c) Linear momentum

d) None of these

Question : 19

During summersault, a swimmer bends his body to

a) decrease the angular momentum

b) decrease moment of Inertia

c) increase moment of Inertia

d) reduce the angular velocity

Question : 20

A composite disc is to be made using equal masses of aluminium and iron so that it has as high a moment of inertia as possible. This is possible when

a) the whole of the iron is kept in the core and the aluminium at the outer rim of the disc

b) the whole of aluminium is kept in the core and the iron at the outer rim of the disc

c) the surfaces of the disc are made of iron with aluminium inside

d) the whole disc is made with thin alternate sheets of iron and aluminium