# MCQ Questions for Class 11 Physics Chapter 6 Work, Energy and Power with Answers

Here you will find NCERT MCQ Questions for Class 11 Physics with Answers PDF Free Download based on the important concepts and topics given in the textbook as per CBSE new exam pattern. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Class 11 Physics. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?

(a) No induced emf is developed.
(b) The end A of the solenoid behaves like a south pole.
(c) The end A of the solenoid behaves like north pole.
(d) The end A of the solenoid acquires positive potential.

(c) The end A of the solenoid behaves like north pole.

## Q2. Identify the wrong statement.

(a) Eddy currents are produced in a steady magnetic field.
(b) Eddy currents can be minimized by using laminated core.
(c) Induction furnace uses eddy current to produce heat.
(d) Eddy current can be used to produce braking force in moving trains.

(a) Eddy currents are produced in a steady magnetic field.

## Q3. Which of the following does not use the application of eddy current?

(a) Electric power meters
(b) Induction furnace
(c) LED lights
(d) Magnetic brakes in trains

(c) LED lights

## Q4. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance

(a) becomes 4 times
(b) becomes 2 times
(c) becomes A times
(d) remains unchanged 4

(a) becomes 4 times

(a) 0.6 m
(b) 0.4 m
(c) 1 m
(d) 0.36 m

(d) 0.36 m

(a) 998 W
(b) 1002 W
(c) 2000 W
(d) 500 W

(d) 500 W

(a) 300
(b) 150
(c) 100
(d) 50

(d) 50

(a) 5g J
(b) 10g J
(c) Zero
(d) g J

(c) Zero

(a) 316 J
(b) 216 J
(c) 116 J
(d) 392 J

(b) 216 J

(a) 4 : 1
(b) 1 : 2
(c) 0 : 1
(d) 1 : 6

(b) 1 : 2

(a) 490 J
(b) 50 J
(c) 100 J
(d) 300 J

(a) 490 J

## Q12. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?

(a) No induced emf is developed.
(b) The end A of the solenoid behaves like a south pole.
(c) The end A of the solenoid behaves like north pole.
(d) The end A of the solenoid acquires positive potential.

(c) The end A of the solenoid behaves like north pole.

## Q13. According to work-energy theorem, the work done by the net force on a particle is equal to the change in its

a) kinetic energy
b) angular momentum
c) linear momentum
d) potential energy

a) kinetic energy

## Q14. When the rate of change oic current is unity, the induced emf is equal to

(a) thickness of coil
(b) number of turns in coil
(c) coefficient of self inductance
(d) total flux linked with coil

(c) coefficient of self inductance

(a) zero
(b) L
(c) 2L
(d) 3L

(c) 2L

## Q16. Work done by a conservative force is positive if

a) P.E. of the body decreases
b) K.E. of the body increases
c) K.E. of the body decreases
d) P.E. of the body increases

a) P.E. of the body decreases

## Q17. Which of the following statements is not correct?

(a) Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in circuit.
(b) The induced emf lasts so long as the change in magnetic flux continues.
(c) The direction of induced emf is given by Lenz’s law.
(d) Lenz’s law is a consequence of the law of conservation of momentum.

(d) Lenz’s law is a consequence of the law of conservation of momentum.

## Q18. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then

(a) current is induced in the loop in the anti-clockwise direction.
(b) current is induced in the loop in the clockwise direction.
(c) ac is induced in the loop.
(d) no current is induced in the loop.

(a) current is induced in the loop in the anti-clockwise direction.

a) increasing
b) zero
c) uniform
d) decreasing

a) increasing

## Q20. A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest

a) at the instant just before the body hits the earth
b) at the highest position of the body
c) it remains constant all through
d) at the instant just after the body is projected

a) at the instant just before the body hits the earth

## Class 11 Physics MCQs Questions with Answers Chapter Wise

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