MCQ PRACTICE – 1

Is the work required to be done by an external force on an object on a frictionless, horizontal surface to accelerate it from a speed v to a speed 2v.

Bullet 2 has twice the mass of bullet 1. Both are fired so that they have the same speed. If the kinetic energy of bullet 1 is K, is the kinetic energy of bullet 2

Work done is equal to?

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

When a body falls freely towards the earth, then its total energy:

When the force and the displacement are in the opposite directions, the work done by the force is ..........

If a body is released from a certain height, during its fall.

A ball rolling on the ground possesses

We can explain free-fall of an object on the basis of?

A ball is allowed to fall from a height of 10m. if there is 

The spring will have maximum potential energy when

A body is falling a height ℎ. After it has fallen a height ℎ/2. it will possess

The height of the water dam in the hydroelectric power station is 20 m. How much water. in 1 second, should fall on turbine, so that 1 MW power is generated ?(g=10m/s^2 )

Whenever energy gets transformed, the total energy_______.

From an automatic gun a man fires 360 bullets per minute with a speed of 360 km/hr. If each bullet weighs 20g, the power of the gun is

A ball of mass 2 kg hits a floor with a speed of 4 m/s at an angle of 60ºwith the normal. If (e=1/2); then the change in the kinetic energy of the ball is

9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of

At the start of the free-fall of an object from height 

If water is flowing in a pipe at a height 4m from the ground then its potential

A constant force of 5N is applied on a block of mass 20 kg for a distance of 2.0 m, the kinetic energy acquired by the block is