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This mock test of MCQ : Work And Energy - 1 for Class 9 helps you for every Class 9 entrance exam.
This contains 10 Multiple Choice Questions for Class 9 MCQ : Work And Energy - 1 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

If 1 newton of force displaces a body by 1 m, the work done is

Solution:

One joule equals the work done ( or energy expended) by a force of One Newton (N) acting over a distance of one meter (m). One Newton equals a force that produces an acceleration of one meter per second (s) per second on a one Kilogram (Kg) mass. Therefore, one joule equals one Newton meter.

QUESTION: 2

A load of 50 kg is pulled upward by 5 m. The work done by the external force is (g = 10 m/s^{2})

Solution:

QUESTION: 3

A mass is moving 5 m/s with speed of along the x-direction on a smooth surface, when a force of 5 N acts on it along they-axis. The work done by against the force is

Solution:

as force is perpendicular to displacement.

QUESTION: 4

A body of mass X kg has a potential energy of X joule relative to the ground, when it is at a height of

Solution:

**Correct Answer :- a**

**Explanation:- As we know that, P.E= mgh**

**X= X×(gh) {g = 9.8}**

**h = 1/9.8**

**=> 0.102**

QUESTION: 5

A bullet entering a metal block of 30 cm length stops on reaching 25 cm. The energy with the bullet will be lost

Solution:

QUESTION: 6

A flying aeroplane possesses

Solution:

QUESTION: 7

A tank contains water of mass ‘m’ to a height ‘h’. The potential energy associated is

Solution:

Height will be upto the centre of gravity of tank, so P.E. = mgh

QUESTION: 8

Two particles of masses 1 g and 4 g have equal kinetic energies. What is the ratio between their momenta?

Solution:

QUESTION: 9

One kWh is

Solution:

QUESTION: 10

A force of 10 N displaces a body by 6 m in 3 seconds. The power of the agency applying the force is

Solution:

We know, Power :-

= force * displacement/Time

Force is 10 N, displacement = 6 m

Time = 3 s

Then, power = 10*6/3 => 10 * 2 ⇒ 20W

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