Work, Energy and Power

Appeared in 9 of the 11 available papers.

Examined in

9 of 11 papers

Appears in most years

Typically worth

7.1 marks

Average per paper it appears in · 64 marks in total

Usual form

Short answer

40% of this chapter's 53 questions

Needs a diagram

21%

11 questions carry a figure — practise drawing them

Question-type distribution

Short answer21
MCQ16
Numerical8
Identification4
Definition2
Reasoning2

Most frequent topics

Work, energy and power 21Kinetic energy 3Power 3Conservation of mechanical energy 3Work done by a force 2Energy conversion 2Energy transformation 2Power and its SI unit 1

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Showing 25 of 53 matching questions (64 marks).

25 questions

Select the correct option for each of the following questions

A body of mass 200 g falls freely from a height of 15 m. [g = 10 ms-2]

13(i)2021

MCQEasy1 mark

When the body reaches 10 m above the ground, its potential energy will be: (a) 20000 J (b) 10 J (c) 10000 J (d) 20 J

13(ii)2021

MCQEasy1 mark

The gain in kinetic energy of the body when it reaches 10 m above the ground is: (a) 20 J (b) 10 J (c) 30 J (d) 25 J

13(iii)2021

MCQEasy1 mark

The total mechanical energy it will possess, when it is just about to strike the ground is: (a) 30000 J (b) 20000 J (c) 30 J (d) 20 J

13(iv)2021

MCQEasy1 mark

The velocity in ms-1 with which the body will hit the ground is: (a) 30 (b) 10 (c) 10√3 (d) 10√2

172021

MCQEasy1 mark

Which one of the following is the correct mathematical relation? (a) Power = Force/ Velocity (b) Power = Force x Acceleration (c) Power Force/ Acceleration (d) Power= Force x Velocity

222021

MCQEasy1 mark

1 joule= __________ erg (a) 10^9 (b) 10^7 (c) 10^5 (d) 10^6

A light body A and a heavy body B have the same momentum.

23(i)2021

MCQEasy1 mark

Choose a correct statement from the given options. (a) kinetic energy of body A and body B will be the same. (b) kinetic energy of body A is greater than kinetic energy of body B. (c) kinetic energy of body B is greater than kinetic energy of body A. (d) unless we know the velocity, we cannot find which body has greater kinetic energy

23(ii)2021

MCQEasy1 mark

If the ratio of kinetic energies of A and B is 5:2 then which one of the following gives the mass ratio of the bodies respectively? (a) 5 : 2 (b) 25 : 4 (c) 2 : 5 (d) 4 : 24

1(b)2020

DefinitionEasy2 marks

Define a kilowatt hour. How is it related to joule ?

ReasoningModerate2 marks

A satellite revolves around a planet in a circular orbit. What is the work done by the satellite at any instant? Give a reason.

5(a)

The figure below shows a simple pendulum of mass 200 g. It is displaced from the mean position A to the extreme position B. The potential energy at the position A is zero. At the position B the pendulum bob is raised by 5 m.