Chapter Exam

Unit 6: Work Power and Energy — Online MCQ Test

Q: Which of the following is the SI unit of work?

Answer: B. Joule — Work is measured in joule (J). One joule is the work done when a force of 1 N produces a displacement of 1 m in the direction of the force.

Q: Work done by a force is zero when the angle between force and displacement is:

Answer: C. 90° — Work done is given by W = Fs cos θ. When θ = 90°, cos 90° = 0, so the work done is zero.

Q: A force of 10 N acts on a body and produces a displacement of 2 m in the same direction. The work done is:

Answer: C. 20 J — For force and displacement in the same direction, W = Fs = 10 × 2 = 20 J.

Q: A 2 kg body moves with velocity 3 m/s. Its kinetic energy is equal to the potential energy of a body of mass 1 kg at height h. Taking g = 10 m/s^2, h is:

Answer: A. 0.9 m — Kinetic energy = 1/2 × 2 × 3^2 = 9 J. Setting mgh = 9 gives 1 × 10 × h = 9, so h = 0.9 m.

Q: Which of the following is NOT true for work done by a constant force?

Answer: D. It is always independent of the path taken — For a constant force, work done depends on force, displacement, and angle. The statement about being independent of path is not a general property stated in this form.

PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 6: Work Power and Energy with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR PHYSICS. This chapter covers: This chapter covers work done by constant and variable forces work-energy theorem kinetic and potential energy conservative forces power and elastic inelastic collisions in one and.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 6: Work Power and Energy — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR PHYSICS — Unit 6: Work Power and Energy, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the SI unit of work?

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

Answer: B. Joule
Work is measured in joule (J). One joule is the work done when a force of 1 N produces a displacement of 1 m in the direction of the force.

Work done by a force is zero when the angle between force and displacement is:

A. 0°
B. 45°
C. 90° ✓
D. 180°

Answer: C. 90°
Work done is given by W = Fs cos θ. When θ = 90°, cos 90° = 0, so the work done is zero.

A force of 10 N acts on a body and produces a displacement of 2 m in the same direction. The work done is:

A. 5 J
B. 10 J
C. 20 J ✓
D. 30 J

Answer: C. 20 J
For force and displacement in the same direction, W = Fs = 10 × 2 = 20 J.

A 2 kg body moves with velocity 3 m/s. Its kinetic energy is equal to the potential energy of a body of mass 1 kg at height h. Taking g = 10 m/s^2, h is:

A. 0.9 m ✓
B. 1.5 m
C. 3.0 m
D. 9.0 m

Answer: A. 0.9 m
Kinetic energy = 1/2 × 2 × 3^2 = 9 J. Setting mgh = 9 gives 1 × 10 × h = 9, so h = 0.9 m.

Which of the following is NOT true for work done by a constant force?

A. It depends on the magnitude of the force
B. It depends on the displacement
C. It depends on the angle between force and displacement
D. It is always independent of the path taken ✓

Answer: D. It is always independent of the path taken
For a constant force, work done depends on force, displacement, and angle. The statement about being independent of path is not a general property stated in this form.

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