Chapter Exam

Chapter 10 PHYSICAL SCIENCE : Work and Energy — Online MCQ Test

Q: What is the SI unit of work?

Answer: A. Joule — The SI unit of work is Joule (J), defined as the work done when a force of 1 Newton displaces an object by 1 meter.

Q: Which of the following is a unit of power?

Answer: A. Joule/second — Power is defined as the rate of doing work, so its unit is Joule per second, which is also known as a Watt.

Q: A girl is carrying a school bag on her back and walking on a leveled road. What is the work done against gravity?

Answer: C. Zero — Since the displacement is horizontal and the force of gravity acts vertically downwards, the angle between them is 90 degrees, resulting in zero work.

Q: A crane lifts a load of 1000 N to a height of 10 m in 20 seconds. What is the power of the crane?

Answer: B. 500 W — Power = Work / Time = (Force * Distance) / Time = (1000 * 10) / 20 = 500 Watts.

Q: If the angle between force and displacement is 180 degrees, the work done is:

Answer: B. Negative — Work = F d cos(theta). If theta is 180 degrees, cos(180) = -1, making the work done negative.

SCIENCE · CLASS 9th · Andhra State Board

Practice Chapter 10 PHYSICAL SCIENCE : Work and Energy with a free chapter-wise online MCQ test for Andhra State Board CLASS 9th SCIENCE. This chapter covers: This chapter details scientific concept of work kinetic energy potential energy law of conservation of energy and rate of doing work power.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10 PHYSICAL SCIENCE : Work and Energy — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 9th SCIENCE — Chapter 10 PHYSICAL SCIENCE : Work and Energy, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of work?

A. Joule ✓
B. Watt
C. Newton
D. Pascal

Answer: A. Joule
The SI unit of work is Joule (J), defined as the work done when a force of 1 Newton displaces an object by 1 meter.

Which of the following is a unit of power?

A. Joule/second ✓
B. Joule-meter
C. Newton/meter
D. Kilowatt-hour

Answer: A. Joule/second
Power is defined as the rate of doing work, so its unit is Joule per second, which is also known as a Watt.

A girl is carrying a school bag on her back and walking on a leveled road. What is the work done against gravity?

A. Positive
B. Negative
C. Zero ✓
D. Infinite

Answer: C. Zero
Since the displacement is horizontal and the force of gravity acts vertically downwards, the angle between them is 90 degrees, resulting in zero work.

A crane lifts a load of 1000 N to a height of 10 m in 20 seconds. What is the power of the crane?