Work and Energy Practice Questions

Class 9 · Science · 1950 free MCQs with instant results and detailed explanations.

1950

Total

816

Easy

927

Medium

207

Hard

Start Practicing Work and Energy

Take a timed quiz or customize your practice session

Quick Quiz (10 Qs) → Mock Test (25 Qs) ⚙ Customize

Topics in Work and Energy

Law of Conservation of Energy 495

Work 260

Power 291

Kinetic and Potential Energy 434

Energy 470

Sample Questions from Work and Energy

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

Which of the following is the SI unit of work?

A. Joule

B. Newton

C. Watt

D. Pascal

Show Answer & Explanation

Correct Answer: A

The SI unit of work is Joule (J), which is defined as the amount of work done when a force of one newton displaces an object by one meter.

Easy

Which of the following situations does not involve work being done?

A. Pushing a cart

B. Holding a heavy box still

C. Carrying a bag while walking

D. Lifting a weight

Show Answer & Explanation

Correct Answer: B

In holding a heavy box still, no displacement occurs. Hence, no work is done, despite the force being applied.

Easy

Which of the following describes work in physics?

A. Work is done when energy is transferred.

B. Work is only done when an object is lifted.

C. Work can only be done by machines.

D. Work is the same as power.

Show Answer & Explanation

Correct Answer: A

Work in physics is defined as the transfer of energy that occurs when a force is applied over a distance in the direction of the force.

Medium

Which of the following scenarios represents zero work done?

A. Carrying a heavy box up a staircase

B. Pushing a wall

C. Dragging a suitcase across a floor

D. Pumping water uphill

Show Answer & Explanation

Correct Answer: B

In pushing a wall, no displacement occurs even though force is applied. Hence, the work done is zero (W = F * d = 0).

Medium

If a student does 200 J of work in 5 seconds, what is the average power exerted?

A. 40 W

B. 20 W

C. 50 W

D. 30 W

Show Answer & Explanation

Correct Answer: A

Average power is calculated using the formula Power = Work / Time. Here, Power = 200 J / 5 s = 40 W.

Medium

In which of the following situations is work being done?

A. A person standing still

B. A child sliding down a slide

C. An object resting on a table

D. A car parked in a garage

Show Answer & Explanation

Correct Answer: B

Work is done when there is displacement in the direction of the applied force. The child sliding down experiences displacement, thus work is done.

Medium

If the work done on an object is 200 J and it is lifted vertically, how much potential energy does it gain?

A. 200 J

B. 100 J

C. 300 J

D. 400 J

Show Answer & Explanation

Correct Answer: A

When work is done to lift an object, it is converted into potential energy. Thus, the potential energy gained is equal to the work done, which is 200 J.

Hard

What happens to the work done if the angle between the force and the direction of motion is 90 degrees?

A. Work is maximum

B. Work is zero

C. Work is halved

D. Work is doubled

Show Answer & Explanation

Correct Answer: B

When the angle between the force and the direction of motion is 90 degrees, the work done is zero because Work = F × d × cos(θ) and cos(90°) = 0.

Hard

In a physics experiment, a student does 300 J of work to lift an object. If the object is raised vertically, what potential energy does it gain?

A. 100 J

B. 300 J

C. 500 J

D. Zero J

Show Answer & Explanation

Correct Answer: B

When work is done to lift an object vertically, it gains potential energy equal to the work done against gravity, which is 300 J.

Q10

Hard

When an object is moved with a constant speed on a frictionless surface, what is the work done on the object?

A. Positive work

B. Negative work

C. Zero work

D. Variable work

Show Answer & Explanation

Correct Answer: C

On a frictionless surface, if the speed is constant, no net force acts on the object, leading to zero work done on it.

Showing 10 of 1950 questions. Start a quiz to practice all questions with scoring and timer.

Practice All 1950 Questions →

More Science Chapters

1 Matter in Our Surroundings

3300 Qs →

2 Is Matter Around Us Pure

3229 Qs →

3 Atoms and Molecules

2697 Qs →

4 Structure of the Atom

2914 Qs →

5 The Fundamental Unit of Life

3467 Qs →

6 Tissues

3489 Qs →

7 Diversity in Living Organisms

3499 Qs →

8 Motion

2427 Qs →

Other Class 9 Subjects

📐 Mathematics → 🌍 Social Science →

Work and Energy — Class 9 Science Practice Questions Online

This page contains 1950 practice MCQs for the chapter Work and Energy in Class 9 Science. The questions are organized by difficulty — 816 easy, 927 medium, 207 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.