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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 of the following increases in a step-down transformer?

Voltage

Frequency

Current

Magnetic flux

2. Transformers are based on:

Coulomb’s law

Faraday’s law of electromagnetic induction

Ampere’s law

Ohm’s law

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

Energy is destroyed

Current flows without cause

Conservation of energy

Magnetic field increases

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

Kirchhoff’s law

Ampere’s law

Coulomb’s law

Lenz’s law

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

Decrease voltage

Increase resistance

Reduce current

Provide low reluctance path for magnetic flux

6. What is the unit of magnetic flux?

Henry

Weber

Volt

Tesla

7. Which quantity is not changed by a transformer?

Power

Frequency

Current

Voltage

8. Which law governs electromagnetic induction?

Coulomb’s Law

Ohm’s Law

Newton’s Law

Faraday’s Law

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

Remains stationary in magnetic field

Moves through a magnetic field

Loses electrons

Is heated

10. In a step-up transformer:

Input current increases

Output voltage is less than input

Number of secondary turns is more than primary

Power output is greater than input

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

Maintain constant voltage

Provide continuous contact for alternating current

Reduce friction

Convert AC to DC

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

Speed of conductor motion

Strength of magnetic field

Number of turns in the coil

Length of the conductor only

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

Electromotive force (emf)

Light

Electric charge

Temperature

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

Infinite

Maximum

Zero

Minimum

15. What is mutual induction?

Induction between two unconnected coils

Self-induced emf in a single coil

Induction of charge due to static electricity

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

16. The basic principle of generator is:

Electrostatics

Mutual induction

Electromagnetic induction

Self-induction

17. Why does a transformer not work with DC?

DC produces too much power

DC increases frequency

Coils are not connected

Magnetic field remains constant

18. In ideal transformer, input power equals:

Output power

Half the output

Twice the output

Zero

19. Eddy currents are reduced in transformer cores by:

Increasing voltage

Using copper

Using thick coils

Using laminated cores

20. The unit of self-inductance is:

Ohm

Weber

Farad

Henry

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

360°

0°

180°

90°

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

Becomes zero

Increases

Decreases

Remains constant

23. In an ideal transformer, efficiency is:

Zero

100%

Variable

Less than 50%

24. What does Faraday’s First Law state?

A current is induced when the magnetic field changes

Induced emf depends on temperature

A current is produced by electric field

Charge is conserved in a conductor

25. A coil with more turns will produce:

Greater emf

Less emf

No emf

Constant emf

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26. What is electromagnetic induction?

Induction of current by friction

Production of current due to changing magnetic field

Production of heat by resistance

Conversion of electricity into magnetism

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

Aids the cause producing it

Opposes the change in magnetic flux

Is random

Always clockwise

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

Voltage

Energy only

Power

Current

29. 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

30. An electric generator works on the principle of:

Capacitance

Thermal conduction

Electromagnetic induction

Electrostatics

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

Oppose the cause

Support the cause

Flow in direction of magnetic field

Stay neutral

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

Remain same

Halve

Double

Become zero

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

Through heating

Through direct contact

Through magnetic field

Through electric field

34. Lenz’s Law is based on:

Ohm’s Law

Conservation of Energy

Law of inertia

Newton’s Laws

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

Laminated soft iron

Carbon

Air

Plastic

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

Stationary magnet

Static electric field

Rotating coil in magnetic field

Heating

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

Magnetic field

Electric current

Mutual resistance

Inductance only

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

Rate of change of magnetic flux

Mass of the conductor

Length of the wire

Shape of the conductor

39. Which device increases or decreases AC voltage?

Resistor

Generator

Capacitor

Transformer

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

Changing magnetic field

Permanent magnet

Direct heat

Static electric charge

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

Electric heater

Induction stove

AC generator

Transformer

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

Maintain electrical contact with external circuit

Insulate the coil

Cool the system

Increase magnetic field

43. Which phenomenon does not occur in DC generators?

Slip rings

Commutation

Electromagnetic induction

Induced emf

44. Why are transformers used in power transmission?

To store energy

To reduce resistance

To increase current

To decrease current and increase voltage for efficiency

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

Mechanical energy

Light

Chemical reaction

Thermal energy

46. A transformer operates on:

Electromagnetic induction with AC

Heating effect of current

Direct current

Electrostatic induction

47. Which material is best for transformer core?

Copper

Glass

Aluminum

Soft iron

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

Steel

Plastic

Copper

Soft iron

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

Becomes zero

Remains same

Increases

Decreases

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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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