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

Laminated soft iron

Carbon

Air

Plastic

2. 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

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

Frequency

Voltage

Magnetic flux

Current

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

Reverse the direction of current

Cool the coil

Convert AC to DC

Insulate the coil

5. What is the unit of magnetic flux?

Volt

Tesla

Henry

Weber

6. Lenz’s Law is based on:

Conservation of Energy

Ohm’s Law

Newton’s Laws

Law of inertia

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

Chemical reaction

Thermal energy

Mechanical energy

Light

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

Direct heat

Permanent magnet

Static electric charge

Changing magnetic field

9. An electric generator works on the principle of:

Electromagnetic induction

Thermal conduction

Capacitance

Electrostatics

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

Speed of conductor motion

Length of the conductor only

Strength of magnetic field

Number of turns in the coil

11. What is electromagnetic induction?

Induction of current by friction

Production of current due to changing magnetic field

Conversion of electricity into magnetism

Production of heat by resistance

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

Through heating

Through direct contact

Through electric field

Through magnetic field

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

Current flows without cause

Energy is destroyed

Conservation of energy

Magnetic field increases

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

Light

Electromotive force (emf)

Electric charge

Temperature

15. Which material is best for transformer core?

Aluminum

Copper

Glass

Soft iron

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

Decreases

Increases

Remains same

Becomes zero

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

Moves through a magnetic field

Is heated

Remains stationary in magnetic field

Loses electrons

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

Oppose the cause

Support the cause

Stay neutral

Flow in direction of magnetic field

19. Which phenomenon does not occur in DC generators?

Electromagnetic induction

Slip rings

Commutation

Induced emf

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

Stationary magnet

Rotating coil in magnetic field

Static electric field

Heating

21. Which device increases or decreases AC voltage?

Transformer

Generator

Resistor

Capacitor

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

Decrease voltage

Provide low reluctance path for magnetic flux

Reduce current

Increase resistance

23. A coil with more turns will produce:

No emf

Less emf

Greater emf

Constant emf

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

Mutual resistance

Electric current

Magnetic field

Inductance only

25. In an ideal transformer, efficiency is:

Less than 50%

Zero

Variable

100%

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26. The basic principle of generator is:

Mutual induction

Electrostatics

Self-induction

Electromagnetic induction

27. Why are transformers used in power transmission?

To store energy

To increase current

To decrease current and increase voltage for efficiency

To reduce resistance

28. Which law governs electromagnetic induction?

Ohm’s Law

Coulomb’s Law

Faraday’s Law

Newton’s Law

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

0°

360°

90°

180°

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

Decreases

Remains constant

Becomes zero

Increases

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

Insulate the coil

Maintain electrical contact with external circuit

Cool the system

Increase magnetic field

32. Eddy currents are reduced in transformer cores by:

Using laminated cores

Using thick coils

Increasing voltage

Using copper

33. A transformer operates on:

Heating effect of current

Electrostatic induction

Electromagnetic induction with AC

Direct current

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

Power

Voltage

Current

Energy only

35. What does Faraday’s First Law state?

A current is produced by electric field

A current is induced when the magnetic field changes

Charge is conserved in a conductor

Induced emf depends on temperature

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

Aids the cause producing it

Always clockwise

Opposes the change in magnetic flux

Is random

37. In a step-up transformer:

Power output is greater than input

Number of secondary turns is more than primary

Output voltage is less than input

Input current increases

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

Ampere’s law

Kirchhoff’s law

Lenz’s law

Coulomb’s law

39. Transformers are based on:

Coulomb’s law

Ampere’s law

Ohm’s law

Faraday’s law of electromagnetic induction

40. 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

41. In ideal transformer, input power equals:

Half the output

Zero

Output power

Twice the output

42. The unit of self-inductance is:

Farad

Henry

Ohm

Weber

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

Become zero

Halve

Double

Remain same

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

Maximum

Zero

Minimum

Infinite

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

Maintain constant voltage

Provide continuous contact for alternating current

Convert AC to DC

Reduce friction

46. Which quantity is not changed by a transformer?

Current

Frequency

Power

Voltage

47. Why does a transformer not work with DC?

DC increases frequency

Coils are not connected

DC produces too much power

Magnetic field remains constant

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

AC generator

Transformer

Induction stove

Electric heater

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

Steel

Copper

Soft iron

Plastic

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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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