12TH Physics - Electromagnetic Induction and Alternating Current MCQS QUIZ

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Electromagnetic Induction & AC MCQ Test

1. Electromagnetic induction is not used in ______.

Transformer
Room heater
AC generator
Choke coil

2. Lenz's law is in accordance with the law of ______.

Conservation of charge
Conservation of flux
Conservation of momentum
Conservation of energy

3. The efficiency of an ideal transformer is ______.

0
1 (100%)
Infinite
None

4. In a transformer, eddy current loss is minimized by using ______.

Laminated core made of mumetal
Laminated core made of stelloy
Shell type core
Thick copper wire

5. In an AC generator, the brushes are made of ______.

Silicon
Plastic
Carbon
Nylon

6. In a single-phase dynamo, the direction of induced current is given by ______.

Faraday's laws
Maxwell's equations
Einstein's equation
Fleming's Right Hand Rule

7. In an AC dynamo, the induced current is ______.

Alternating
Increasing
Decreasing
Constant

8. An alternator produces voltage waves equal to the number of ______ used.

Slip rings
Windings
Magnets
Brushes

9. The generator rule is ______.

Fleming's Left Hand Rule
Fleming's Right Hand Rule
Maxwell's Cork Screw Rule
Right Hand Palm Rule

10. Eddy currents were first observed by ______.

Foucault
Newton
Faraday
Fleming

11. The property of a coil to produce an opposing induced emf when current changes is called ______.

Electromagnetism
Self-induction
Mutual induction
Parallel induction

12. The necessary magnetic field for a low-power AC generator is produced by ______.

Electric coil
Permanent magnets
Electromagnets
Batteries

13. Energy is stored in an inductor as ______.

Electrical energy
Magnetic potential energy
Electrical potential energy
Heat energy

14. A varying current in one coil inducing emf in a nearby coil is called ______.

Mutual induction
Self induction
Electrostatic induction
Electromagnetic induction

15. If two coils are wound on a soft iron core, the mutual induction is ______.

Small
Very large
Infinite
Zero

16. In Fleming's Right Hand Rule, the forefinger represents the direction of ______.

Motion of conductor
Magnetic field
Induced current
Induced emf

17. The SI unit of self-inductance is ______.

Henry
Ampere
Farad
Ohm

18. Which of the following cannot be stepped up using a transformer?

Input current
Input voltage
Input power
All of these

19. The magnitude of induced emf depends on the ______.

Flux density
Amount of flux cut
Amount of flux linkage
Rate of change of flux

20. The self-inductance of a straight conductor is ______.

Zero
Infinity
Very large
Very small