Class 11 Physics MCQ Chapter 6 Work, Energy and Power
Looking for Class 11 Physics MCQ Chapter 6 Work, Energy and Power English Medium? This article is a complete study resource for AHSEC Higher Secondary First Year students who want to practice important multiple-choice questions and improve their Physics preparation.
The chapter Work, Energy and Power explains the relationship between force, motion, and energy. Students will learn about work done by a force, kinetic energy, potential energy, power, conservation of energy, and mechanical energy. These concepts are fundamental to understanding how energy is transferred and transformed in various physical processes.
The MCQs provided here are prepared according to the latest AHSEC syllabus and examination pattern. They are designed to help students revise important concepts, improve numerical problem-solving skills, and become familiar with objective questions commonly asked in examinations. Regular practice can help build confidence and improve performance.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you strengthen your understanding of Physics and achieve better academic results.
Part I
Class 11 Physics MCQ Chapter 6 Work, Energy and Power
VSA & MCQs
I. Very Short Answer (VSA) Questions with Answers
Q. What is work in physics?
Ans: Work is said to be done when a force causes displacement of a body.
Q. What is the SI unit of work?
Ans: Joule (J).
Q. Define energy.
Ans: Energy is the capacity to do work.
Q. What is kinetic energy?
Ans: The energy possessed by a body due to its motion.
Q. What is potential energy?
Ans: The energy possessed by a body due to its position or configuration.
Q. What is power?
Ans: Power is the rate of doing work.
Q. What is the SI unit of power?
Ans: Watt (W).
Q. What is a conservative force?
Ans: A force for which the work done is independent of the path.
Q. Give one example of a conservative force.
Ans: Gravitational force.
Q. What is a non-conservative force?
Ans: A force for which the work done depends on the path.
Q. Give one example of a non-conservative force.
Ans: Frictional force.
Q. State the work-energy theorem.
Ans: Work done on a body equals the change in kinetic energy.
Q. What is mechanical energy?
Ans: The sum of kinetic energy and potential energy.
Q. State the law of conservation of energy.
Ans: Energy can neither be created nor destroyed; it only changes form.
Q. What is zero work?
Ans: Work is zero when displacement is zero or force acts perpendicular to displacement.
Q. When is work positive?
Ans: Work is positive when force and displacement are in the same direction.
Q. When is work negative?
Ans: Work is negative when force and displacement are in opposite directions.
Q. Define one horsepower.
Ans: One horsepower equals 746 watts.
Q. What is elastic potential energy?
Ans: Energy stored in a stretched or compressed elastic body.
Q. Which energy increases with height?
Ans: Potential energy.
Q. Which energy depends on velocity?
Ans: Kinetic energy.
II. Multiple Choice Questions (MCQs)
Q. The SI unit of work is:
(a) Watt
(b) Joule
(c) Newton
(d) Pascal
Ans: (b) Joule
Q. The SI unit of power is:
(a) Joule
(b) Newton
(c) Watt
(d) Pascal
Ans: (c) Watt
Q. Kinetic energy depends upon:
(a) Height
(b) Velocity
(c) Temperature
(d) Pressure
Ans: (b) Velocity
Q. Which force is conservative?
(a) Friction
(b) Muscular force
(c) Gravitational force
(d) Viscous force
Ans: (c) Gravitational force
Q. Work done by friction is generally:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Ans: (b) Negative
Q. When displacement is zero, work done is:
(a) Maximum
(b) Minimum
(c) Zero
(d) Infinite
Ans: (c) Zero
Q. Which energy is possessed by a moving body?
(a) Potential energy
(b) Kinetic energy
(c) Heat energy
(d) Chemical energy
Ans: (b) Kinetic energy
Q. The work done by the centripetal force in uniform circular motion is:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Ans: (c) Zero
Q. Which quantity is scalar?
(a) Force
(b) Velocity
(c) Work
(d) Acceleration
Ans: (c) Work
Q. Mechanical energy is the sum of:
(a) Heat and light energy
(b) Potential and kinetic energy
(c) Sound and heat energy
(d) Electrical and magnetic energy
Ans: (b) Potential and kinetic energy
Q. Which of the following is a unit of energy?
(a) Watt
(b) Joule
(c) Newton
(d) Pascal
Ans: (b) Joule
Q. The energy stored in a stretched spring is:
(a) Chemical energy
(b) Elastic potential energy
(c) Heat energy
(d) Nuclear energy
Ans: (b) Elastic potential energy
Q. The commercial unit of electrical energy is:
(a) Joule
(b) Watt
(c) Kilowatt-hour
(d) Newton
Ans: (c) Kilowatt-hour
Q. Which law states that energy cannot be destroyed?
(a) Newton’s law
(b) Ohm’s law
(c) Conservation of energy
(d) Hooke’s law
Ans: (c) Conservation of energy
Q. A body at rest possesses:
(a) Only kinetic energy
(b) Only potential energy
(c) Both kinetic and potential energy
(d) No energy
Ans: (b) Only potential energy
Q. Which force does path-dependent work?
(a) Gravitational force
(b) Electrostatic force
(c) Frictional force
(d) Magnetic force
Ans: (c) Frictional force
Q. The work-energy theorem relates work with:
(a) Force
(b) Momentum
(c) Change in kinetic energy
(d) Power
Ans: (c) Change in kinetic energy
Q. If force is perpendicular to displacement, work done is:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Ans: (c) Zero
Q. Which quantity measures rate of energy transfer?
(a) Work
(b) Power
(c) Force
(d) Momentum
Ans: (b) Power
Q. The kinetic energy of a body becomes four times if the velocity becomes:
(a) Double
(b) Half
(c) Triple
(d) Four times
Ans: (a) Double
Q. Which of the following is not a form of energy?
(a) Kinetic energy
(b) Potential energy
(c) Friction
(d) Heat energy
Ans: (c) Friction
Q. Horsepower is a unit of:
(a) Work
(b) Energy
(c) Power
(d) Force
Ans: (c) Power
Q. The energy possessed due to position is:
(a) Kinetic energy
(b) Potential energy
(c) Sound energy
(d) Heat energy
Ans: (b) Potential energy
Q. Work done by gravity during free fall is:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite
Ans: (a) Positive
III. Assertion–Reason Type MCQs
Q. Assertion (A): Work done by the centripetal force is zero.
Reason (R): Centripetal force acts perpendicular to displacement.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Friction is a non-conservative force.
Reason (R): Work done by friction depends on path.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Power is the rate of doing work.
Reason (R): Power depends on time taken.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Mechanical energy remains constant in absence of nonconservative forces.
Reason (R): Conservative forces conserve total mechanical energy.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Kinetic energy depends on mass and velocity.
Reason (R): Kinetic energy is proportional to (mv^2).
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): Work done can be negative.
Reason (R): Force may act opposite to displacement.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a) Both A and R are true and R is the correct explanation of A.
Q. Assertion (A): A body at rest cannot possess energy.
Reason (R): Potential energy may exist even when the body is at rest.
(a) Both A and R are true and R is the correct explanation of A.
(b) A is false but R is true.
(c) A is true but R is false.
(d) Both A and R are false.
Ans: (b) A is false but R is true.
