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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Print chapter question bank

Showing 25 of 53 matching questions (64 marks).

25 questions

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(ii)2026

MCQEasy1 mark

The energy transformation taking place during photosynthesis in plants is: (a) heat to chemical (b) chemical to light (c) light to chemical (d) chemical to heat

1(vi)2026

MCQEasy1 mark

A fast-moving cyclist stops pedalling on reaching a hilly track. If he continues to move with the acquired energy, then assuming no loss of energy: (a) his kinetic energy remains constant at all times. (b) his potential energy remains constant at all times. (c) his total mechanical energy continuously increases. (d) his total mechanical energy remains constant.

6(ii)(a)2026

IdentificationEasy1 mark

Name the unit of work done, used in subatomic scale.

Short answerModerate1 mark

A stone is tied to a string and displaced from A to B by application of constant force F in three different ways as shown in the diagram below. Arrange the three cases in ascending order of the work done by the force. (Given AJB is a semi-circle, θ < 90° and AB = 20 m)

6(iii)

A ball of mass 20 g falls from a height of 45 m. It rebounds from the ground to a height of 40 m. Calculate :

6(iii)(a)2026

NumericalModerate1 mark

initial potential energy of the ball.

6(iii)(b)2026

NumericalModerate2 marks

the speed of the ball at which it hits the ground.

Short answerEasy1 mark

the loss in kinetic energy on striking the ground. [g = 10 m s⁻²]

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(iii)2025

MCQEasy1 mark

What is the correct energy transformation during burning of a candle? (a) heat --> kinetic + potential (b) heat --> chemical + light (c) chemical --> heat + light (d) mechanical --> chemical + heat

6(iii)

Richa weighing 40 kgf leaves point P on her skateboard and reaches point Q on the ground with velocity 10 ms-1. Calculate.

6(iii)(a)2025

NumericalModerate1 mark

the kinetic energy of Richa at point Q

6(iii)(b)2025

NumericalModerate1 mark

the vertical height of point P above the ground. (use g as 10 m/s2 and neglect friction)

NumericalModerate2 marks

the kinetic energy of Richa at point R. (While moving from Q to R, she loses 500 J of energy against friction.)

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(i)2024

MCQEasy1 mark

When a bell fixed on a cycle rings, then the energy conversion that takes place is: (a) gravitational potential energy to sound energy (b) kinetic energy to sound energy (c) sound energy to electrical energy (d) sound energy to mechanical energy

1(iii)2024

MCQEasy1 mark

A force ‘F’ moves a load from A to C as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement? (a) 3m (b) 4m (c) 5m (d) 7m

2(v)2024

NumericalModerate2 marks

Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.

6(ii)

Two identical marbles A and B are rolled down along Path 1 and Path 2 respectively. Path 1 is frictionless and Path 2 is rough.

6(ii)(a)2024

IdentificationEasy1 mark

Which marble will surely reach the next peak?

6(ii)(b)2024

IdentificationEasy1 mark

Along which path/s the mechanical energy will be conserved?

IdentificationEasy1 mark

Along which path/s is the law of conservation of energy obeyed?

Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)

1(ii)2023

MCQEasy1 mark

When the speed of a moving object is doubled, then its kinetic energy: (a) remains the same (b) decreases (c) is doubled (d) becomes four times

1(iii)2023

MCQEasy1 mark

The energy conversion in a washing machine is from ............... (a) magnetic to electrical (b) electrical to mechanical (c) electrical to magnetic (d) magnetic to electrical

2(iv)(a)2023

Short answerEasy1 mark

What should be the angle between the direction of force and the direction of displacement, for work to be negative?

2(iv)(b)2023

Short answerEasy1 mark

Name the physical quantity obtained using the formula U/h, where U is the potential energy and h is the height.

2(v)2023

NumericalModerate2 marks

Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2).

6(iii)

A car of mass 120 kg is moving at a speed 18 km/h and it accelerates to attain a speed of 54 km/h in 5 seconds. Calculate:

6(iii)(a)2023

Short answerEasy3 marks

the work done by the engine.

6(iii)(b)2023

Short answerEasy1 mark

the power of the engine.

Select the correct option for each of the following questions

102021

MCQEasy1 mark

The energy change during photosynthesis in plants is: (a) heat to chemical. (b) light to chemical. (c) chemical to light. (d) chemical to heat.