Chapter Exam

Chapter 4: Work Energy and Power — Online MCQ Test

Q: What is the SI unit of work?

Answer: A. Joule — Work is defined as force multiplied by displacement, and its SI unit is the Joule (J).

Q: Which of the following is a scalar quantity?

Answer: B. Work — Work is the dot product of force and displacement vectors, resulting in a scalar quantity.

Q: If the velocity of a body is doubled, its kinetic energy becomes:

Answer: B. Four times — Kinetic energy is proportional to the square of velocity (KE = 1/2 mv^2), so doubling v quadruples the KE.

Q: A particle of mass m moves with constant speed v on a circular path of radius r. The work done in one complete revolution is:

Answer: C. Zero — Since the force is always perpendicular to displacement at every point, the total work done over a closed loop is zero.

Q: A 10 kg mass moving at 5 m/s collides with a 5 kg mass at rest. If they stick together, what is the loss in kinetic energy?

Answer: B. 41.67 J — Calculate initial KE, find final velocity using momentum conservation, calculate final KE, and find the difference.

PHYSICS · CLASS 11th · Tamil Nadu State Board

Practice Chapter 4: Work Energy and Power with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th PHYSICS. This chapter covers: Focusing on mechanical energetics this chapter details work done by constant and variable forces work-energy theorem potential kinetic energy. Students examine conservative non-con.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 4: Work Energy and Power — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th PHYSICS — Chapter 4: Work Energy and Power, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of work?