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

Plastic

Steel

Copper

Soft iron

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

Rotating coil in magnetic field

Heating

Stationary magnet

Static electric field

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

Provide continuous contact for alternating current

Maintain constant voltage

Convert AC to DC

Reduce friction

4. What is the unit of magnetic flux?

Volt

Henry

Tesla

Weber

5. What is mutual induction?

Induction between two unconnected coils

Induction of charge due to static electricity

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

Self-induced emf in a single coil

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

Electric charge

Temperature

Light

Electromotive force (emf)

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

Length of the conductor only

Strength of magnetic field

Number of turns in the coil

Speed of conductor motion

8. Which quantity is not changed by a transformer?

Power

Current

Frequency

Voltage

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

Frequency

Magnetic flux

Current

Voltage

10. What is electromagnetic induction?

Production of heat by resistance

Conversion of electricity into magnetism

Induction of current by friction

Production of current due to changing magnetic field

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

Current

Energy only

Power

Voltage

12. Which device increases or decreases AC voltage?

Generator

Resistor

Transformer

Capacitor

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

Permanent magnet

Direct heat

Changing magnetic field

Static electric charge

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

Reduce current

Provide low reluctance path for magnetic flux

Decrease voltage

Increase resistance

15. Transformers are based on:

Faraday’s law of electromagnetic induction

Ampere’s law

Coulomb’s law

Ohm’s law

16. In an ideal transformer, efficiency is:

Zero

100%

Variable

Less than 50%

17. In ideal transformer, input power equals:

Zero

Twice the output

Half the output

Output power

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

Insulate the coil

Maintain electrical contact with external circuit

Cool the system

Increase magnetic field

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

Shape of the conductor

Length of the wire

Mass of the conductor

Rate of change of magnetic flux

20. A coil with more turns will produce:

No emf

Greater emf

Constant emf

Less emf

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

Is random

Aids the cause producing it

Always clockwise

Opposes the change in magnetic flux

22. Eddy currents are reduced in transformer cores by:

Using copper

Using thick coils

Using laminated cores

Increasing voltage

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

Ampere’s law

Coulomb’s law

Lenz’s law

Kirchhoff’s law

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

Increases

Decreases

Remains same

Becomes zero

25. Which law governs electromagnetic induction?

Faraday’s Law

Ohm’s Law

Newton’s Law

Coulomb’s Law

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

Infinite

Zero

Maximum

Minimum

27. The unit of self-inductance is:

Henry

Farad

Weber

Ohm

28. Why are transformers used in power transmission?

To increase current

To store energy

To decrease current and increase voltage for efficiency

To reduce resistance

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

Remain same

Become zero

Halve

Double

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

Remains stationary in magnetic field

Is heated

Loses electrons

Moves through a magnetic field

31. What does Faraday’s First Law state?

A current is induced when the magnetic field changes

Charge is conserved in a conductor

Induced emf depends on temperature

A current is produced by electric field

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

Through heating

Through electric field

Through direct contact

Through magnetic field

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

Energy is destroyed

Magnetic field increases

Current flows without cause

Conservation of energy

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

Increases

Becomes zero

Decreases

Remains constant

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

Chemical reaction

Mechanical energy

Light

Thermal energy

36. Lenz’s Law is based on:

Newton’s Laws

Law of inertia

Ohm’s Law

Conservation of Energy

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

0°

360°

90°

180°

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

Convert AC to DC

Reverse the direction of current

Cool the coil

Insulate the coil

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

Plastic

Carbon

Laminated soft iron

Air

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

Electric heater

Induction stove

Transformer

AC generator

41. Why does a transformer not work with DC?

Coils are not connected

DC increases frequency

DC produces too much power

Magnetic field remains constant

42. In a step-up transformer:

Number of secondary turns is more than primary

Input current increases

Output voltage is less than input

Power output is greater than input

43. The basic principle of generator is:

Electromagnetic induction

Self-induction

Mutual induction

Electrostatics

44. Which phenomenon does not occur in DC generators?

Electromagnetic induction

Commutation

Induced emf

Slip rings

45. A transformer operates on:

Direct current

Heating effect of current

Electromagnetic induction with AC

Electrostatic induction

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

Support the cause

Stay neutral

Oppose the cause

Flow in direction of magnetic field

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

Mutual resistance

Inductance only

Electric current

Magnetic field

48. An electric generator works on the principle of:

Thermal conduction

Capacitance

Electromagnetic induction

Electrostatics

49. Which material is best for transformer core?

Aluminum

Copper

Glass

Soft iron

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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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