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Important Questions

Work, Energy, and Simple Machines

CBSE · Class 9 · Science

Most important questions from Work, Energy, and Simple Machines for CBSE Class 9 Science board exam 2026. MCQs, short answer, and long answer questions with marks.

80 questions80 flashcards5 concepts

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A line graph showing distance on the Y-axis and time on the X-axis, depicting a straight line passing through the origin, representing uniform speed. Includes labels for calculating speed from the slo
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80 Questions·
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Sample Questions

1multiple choice
3 marks

A car of mass 1000 kg starts from rest and reaches 72 km h^-1 in 10 s. What is the power of the engine?

Show answer

20,000 W

From the previous calculation, work done is 200,000 J. Power = W/t = 200,000/10 = 20,000 W.

2multiple choice
3 marks

A cricket ball of mass 0.2 kg is bowled at 154.8 km h^-1. What is its kinetic energy?

Show answer

184.9 J

Convert speed: 154.8 km h^-1 = 43 m s^-1. Then K = 1/2 mv^2 = 1/2 × 0.2 × 43^2 = 0.1 × 1849 = 184.9 J.

3multiple choice
3 marks

A cricket ball of mass 0.2 kg is thrown so that it reaches a height of 10 m. Taking g = 10 m s^-2, what is its gravitational potential energy at the top?

Show answer

20 J

Use U = mgh = 0.2 × 10 × 10 = 20 J.

4multiple choice
3 marks

A child slides down from a height of h and reaches the bottom with speed v, neglecting friction. If h = 5 m and g = 10 m s^-2, what is the speed at the bottom?

Show answer

10 m s^-1

Use conservation of mechanical energy: mgh = 1/2 mv^2. Mass cancels, so v = sqrt(2gh) = sqrt(2 × 10 × 5) = sqrt(100) = 10 m s^-1.

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Frequently Asked Questions

What are the important topics in Work, Energy, and Simple Machines for CBSE Class 9 Science?
Key topics in Work, Energy, and Simple Machines include Distance vs Displacement: The Correct Decision Path, Motion - Complete Chapter Concept Overview, Chapter 7 Motion – Complete Concept Map. These are the concepts CBSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Work, Energy, and Simple Machines — CBSE Class 9 Science?
Understand the core concepts first, then work through the 80 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Work, Energy, and Simple Machines?
There are 80 practice questions available for Work, Energy, and Simple Machines. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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