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MDCAT Physics Electromagnetic Induction Test Online

Mustansar KhanLast Updated: May 26, 2025

Physics Electromagnetic Induction MCQS Online Test

MDCAT Physics Electromagnetic Induction Chapter Online Test

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

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1. In ideal transformer, input power equals:

Twice the output

Output power

Half the output

Zero

2. Why are transformers used in power transmission?

To increase current

To decrease current and increase voltage for efficiency

To store energy

To reduce resistance

3. The unit of self-inductance is:

Ohm

Henry

Farad

Weber

4. In AC generators, alternating current is produced due to:

Direct heat

Static electric charge

Changing magnetic field

Permanent magnet

5. What does Faraday’s First Law state?

A current is produced by electric field

Induced emf depends on temperature

A current is induced when the magnetic field changes

Charge is conserved in a conductor

6. Which of these quantities is conserved in an ideal transformer?

Energy only

Power

Current

Voltage

7. In an ideal transformer, efficiency is:

Less than 50%

100%

Variable

Zero

8. Induced emf is maximum when angle between magnetic field and motion of conductor is:

180°

360°

0°

90°

9. Transformers are based on:

Coulomb’s law

Ohm’s law

Faraday’s law of electromagnetic induction

Ampere’s law

10. Why does a transformer not work with DC?

Magnetic field remains constant

DC produces too much power

DC increases frequency

Coils are not connected

11. Primary and secondary coils in a transformer are linked through:

Electric current

Magnetic field

Mutual resistance

Inductance only

12. What is the role of brushes in a generator?

Maintain electrical contact with external circuit

Insulate the coil

Increase magnetic field

Cool the system

13. An emf is induced in a conductor when it:

Remains stationary in magnetic field

Loses electrons

Is heated

Moves through a magnetic field

14. According to Lenz’s Law, the induced current will:

Stay neutral

Support the cause

Oppose the cause

Flow in direction of magnetic field

15. The number of turns in the secondary coil of a transformer is doubled. The output voltage will:

Halve

Become zero

Remain same

Double

16. Which law governs electromagnetic induction?

Faraday’s Law

Newton’s Law

Ohm’s Law

Coulomb’s Law

17. Faraday's Second Law relates induced emf to:

Length of the wire

Mass of the conductor

Shape of the conductor

Rate of change of magnetic flux

18. What is the source of energy in an electric generator?

Chemical reaction

Thermal energy

Light

Mechanical energy

19. What is mutual induction?

Induction of charge due to static electricity

Self-induced emf in a single coil

Induction between two unconnected coils

Production of emf in one coil due to change of current in another

20. What is the function of slip rings in an AC generator?

Provide continuous contact for alternating current

Convert AC to DC

Reduce friction

Maintain constant voltage

21. The direction of induced current is such that it:

Is random

Always clockwise

Opposes the change in magnetic flux

Aids the cause producing it

22. What is the purpose of an iron core in a transformer?

Provide low reluctance path for magnetic flux

Increase resistance

Decrease voltage

Reduce current

23. What kind of core is used in a transformer to reduce energy loss?

Plastic

Air

Laminated soft iron

Carbon

24. Which phenomenon does not occur in DC generators?

Induced emf

Commutation

Electromagnetic induction

Slip rings

25. If frequency of AC input increases, induced emf in transformer:

Decreases

Remains constant

Increases

Becomes zero

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26. What is the unit of magnetic flux?

Volt

Weber

Henry

Tesla

27. The basic principle of generator is:

Electromagnetic induction

Mutual induction

Electrostatics

Self-induction

28. What is electromagnetic induction?

Conversion of electricity into magnetism

Production of heat by resistance

Induction of current by friction

Production of current due to changing magnetic field

29. Which core material is used in transformers for maximum efficiency?

Plastic

Copper

Steel

Soft iron

30. If magnetic flux through a coil is constant, induced emf is:

Zero

Maximum

Infinite

Minimum

31. Which device increases or decreases AC voltage?

Generator

Transformer

Capacitor

Resistor

32. Lenz’s Law is based on:

Law of inertia

Conservation of Energy

Newton’s Laws

Ohm’s Law

33. An electric generator works on the principle of:

Thermal conduction

Electrostatics

Capacitance

Electromagnetic induction

34. When magnetic flux through a coil changes, what is produced?

Electric charge

Electromotive force (emf)

Temperature

Light

35. The function of a commutator in a generator is to:

Convert AC to DC

Cool the coil

Insulate the coil

Reverse the direction of current

36. Which of the following supports Lenz’s Law?

Magnetic field increases

Conservation of energy

Energy is destroyed

Current flows without cause

37. What happens to induced emf if speed of coil rotation in a generator is increased?

Remains same

Becomes zero

Increases

Decreases

38. Eddy currents are reduced in transformer cores by:

Using thick coils

Increasing voltage

Using laminated cores

Using copper

39. Which factor does NOT affect the magnitude of induced emf?

Speed of conductor motion

Number of turns in the coil

Length of the conductor only

Strength of magnetic field

40. In a step-up transformer:

Input current increases

Number of secondary turns is more than primary

Output voltage is less than input

Power output is greater than input

41. Which of the following increases in a step-down transformer?

Magnetic flux

Frequency

Voltage

Current

42. Which material is best for transformer core?

Soft iron

Copper

Aluminum

Glass

43. In a transformer, energy is transferred from primary to secondary:

Through magnetic field

Through direct contact

Through electric field

Through heating

44. The direction of induced current can be found using:

Ampere’s law

Lenz’s law

Coulomb’s law

Kirchhoff’s law

45. Which quantity is not changed by a transformer?

Current

Voltage

Power

Frequency

46. Which of the following does NOT use electromagnetic induction?

Induction stove

Transformer

AC generator

Electric heater

47. A coil with more turns will produce:

No emf

Constant emf

Greater emf

Less emf

48. In an AC generator, current is induced by:

Stationary magnet

Heating

Static electric field

Rotating coil in magnetic field

49. A transformer operates on:

Electromagnetic induction with AC

Heating effect of current

Direct current

Electrostatic induction

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Physics Electromagnetic Induction Test Online

Physics Electromagnetic Induction MCQS Online Test

MDCAT Physics Electromagnetic Induction Chapter Online Test

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Physics Electromagnetic Induction MCQS Online Test

MDCAT Physics Electromagnetic Induction Chapter Online Test

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Mustansar Khan

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