Test: Work & Energy - 4


25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Work & Energy - 4


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QUESTION: 1

When a light and a heavy body have equal K.E, then which one has a greater momentum?

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QUESTION: 2

In SI system, the unit of P.E. is

Solution: Joule. As potential energy is a form of energy so it's SI unit is also Joule. The gravitational potential energy has the same units as kinetic energy, kg m2 / s2. In fact, all energy has the same units, kg m2 / s2, and is measured using the SI unit is Joule (J).
QUESTION: 3

Kilowatt hour (kWh) represents the unit of

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QUESTION: 4

When speed of a motor car increases six times, then kinetic energy increases by

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QUESTION: 5

1 kWh equals

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QUESTION: 6

When speed of the moving object is doubled its

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QUESTION: 7

When time taken to complete a given amount of work increases, then

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QUESTION: 8

When the force applied and the displacement of the body are inclined at 90° with each other, then work done is

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QUESTION: 9

The KE. of a body in increased most by doubling its

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QUESTION: 10

If a force F is applied on a body and it move with velocity v, then power will be :-

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QUESTION: 11

Work done by a centripetal force

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QUESTION: 12

Potential energy and kinetic energy are types of

Solution:

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position). 

QUESTION: 13

Work done in moving a 50 kg block through a horizontal distance of 10 m by applying a force of 100N which makes an angle of 60° with the horizontal is

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QUESTION: 14

kWh is the unit of

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QUESTION: 15

An elevator is designed to lift a load of 1000 kg through 6 floors of a building averaging 3·5 m per floor in 6 sec. Power of the elevator, neglecting other losses, will be

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QUESTION: 16

The work done by a body is directly proportional to :

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QUESTION: 17

Work done is said to be positive when a force causes displacement:

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QUESTION: 18

The work done on an object does not depends on the

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QUESTION: 19

In which case work is not done:

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QUESTION: 20

In which case work is done:

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QUESTION: 21

A stone is tied to a string and whirled in a circular path. The work done by the stone is :

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QUESTION: 22

In order to do work, energy is

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QUESTION: 23

A rocket rises up in the air due to the force generated by the fuel. The work done by the:

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QUESTION: 24

One joule work is said to be done when a force of one newton acts through a distance of:

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QUESTION: 25

Work is the product of time and:

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