HSSC-II (Class-12) Solved Physics MCQs; Unit-14: Electromagnetic Induction; (New Book/KPK Text Board, Peshawar) With Verified Answers

1. For inducing e.m.f. in a coil the basic requirement is that

A. Flux should link the coil
B. By change in flux should link the coil
C. coil should form a closed loop
D. both B and C are true

... Answer is D. both B and C are true
--------------------------

2. When a single-turn coil rotates in a uniform magnetic field, at uniform speed the induced e.m.f. will be

A. Alternating
B. Steady
C. Pulsating
D. Zero

... Answer is A. Alternating
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3. Principle of dynamically induced e.m.f. is used in a

A. Choke
B. Transformer
C. Generator
D. Thermo-couple

... Answer is C. Generator
---------------------------

4. In Fleming's left-hand rule thumb always represents the direction of

A. Current flow
B. Induced e.m.f.
C. Magnetic field
D. Mechanical force

... Answer is D. Mechanical force
--------------------------------

5.  The field at any point on the axis of a current-carrying coil will be

A. Perpendicular to the axis.
B. Parallel to the axis.
C. At an angle of 45° with the axis.
D. Zero.

... Answer is B. Parallel to the axis.
------------------------

6. When a coil rotated in a magnetic field the induced current in it

A. continuously changes
B. remains same
C. becomes zero
D. becomes maximum

... Answer is A. continuously changes
------------------------------

7. In the A.C generator increasing the number of turns in the coil :

A. decreases the Electromotive force (e.m.f.)
B. electromotive force (e.m.f.) remains same
C. increases the Electromotive force (e.m.f.)
D. electromotive force (e.m.f.) becomes zero

... Answer is C. increases the Electromotive force (e.m.f.)
--------------------------

8. The device in which induced e.m.f. is statically induced e.m.f. is

A. transformer
B. AC generator
C. alternator
D. dynamo

... Answer is A. transformer
-------------------------

9. What is the coefficient of mutual inductance, when the magnetic flux changes by 2 ｘ 10⁻² Wb, and the change in current is 0.01 A?

A. 2H
B. 3H
C. 1/2 H
D. Zero

... Answer is A. 2H
------------------------

10. The induced e.m.f. in a coil is proportional to

A. magnetic flux through the coil
B. rate of change of magnetic flux through the coil
C. area of the coil
D. product of magnetic flux and area of the coil

... Answer is B. rate of change of magnetic flux through the coil
----------------------

11. In a coil current changes from 2 to 4 A in 0.05 s. If the average induced e.m.f. is 8 V then the coefficient of self-inductance is

A. 0.2 henry
B. 0.1 henry
C. 0.8 henry
D. 0.04 henry

... Answer is A. 0.2 henry
------------------------------

12. Which of the following, quantities remain constant in step-up transformer?

A. current
B. voltage
C. power
D. heat

... Answer is C. power
-------------------------

13. Step-up transformer has a transformation ratio of 3:2. What is the voltage in the secondary, if the voltage in the primary is 30V?

A. 45 V
B. 15 V
C. 90 V
D. 300 V

... Answer is A. 45 V
-------------------------

14.  Eddy current is produced when

A. a metal is kept in a varying magnetic field
B. a metal is kept in a steady magnetic field
C. circular coil is placed in a steady magnetic field
D. current is passed through a circular coil

... Answer is A. a metal is kept in a varying magnetic field
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