Physics MCQs for Class 9 with Answers Chapter 5

Above of mass 50 kg is raised to a height of 3m. what is its P.E

500 J

1000 J

1500 J

2000 J

If the direction of motion of the force is perpendicular to the direction of motion of the body then work done will be:

Maximum

Minimum

Zero

None of these

The potential energy of a body of mass ‘m’ placed at a height ‘h’ above the surface of &nbsp earth is equal to

P.E. = mg

P.E. = mgh

P.E. = 3mgh

P.E. = 2mgh

The kinetic energy of a body of mass 2 kg is 25 J. Its speed is:

5 ms-1

12.5 ms-1

25 ms-1

50 ms-1

The unit of kinetic energy is:

J

N

Km

Pa

The energy released int he form of nuclear radiations in addition to heat and light is called:

Mechanical energy

Gravitational energy

Chemical energy

Nuclear energy

Kilowatt – hour is unit of _____________

Power

Energy

Work

K.e

Mathematically, % efficiency is defined as & nbsp

Efficiency % required form or input/ total input energy x 100

Efficiency % required form or input/ total input energy x 100

Efficiency % input energy / output energy x 100

Efficiency % work / time x 100

The product of force and displacement is called;

Work

Efficiency

Power

Energy

If the velocity of the body becomes double then its kinetic energy will:

Remain the same

Become double

Become four times

Become half