Physics Electromagnetic Induction MCQs Chapter 4 Class 12 - PLS Academy

Physics Electromagnetic Induction MCQs Chapter 4 Class 12

Physics Electromagnetic Induction is a key chapter of Class 12 Physics and plays an important role in free preparations for entry tests and FSC Part-II exams. It is frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and FSC examinations. This chapter covers essential topics such as Faraday’s law, Lenz’s law, induced EMF, self and mutual induction, and eddy currents. Many students use entry test MCQs and practice tests to reinforce these concepts efficiently.

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Created on February 07, 2022 By Ali Durrani

Physics Ch 15 Class 12 Electromagnetic Waves

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1 / 65

A common material for cushioning objects in packages is made by trapping bubbles of air between sheets of plastic. Is this material more effective at keeping the contents of the package from moving around inside the package?

PMC Practice 8
Physics
Electromagnetic Waves
Elimination Tool:

A) A hot day

B) A cold day

C) Either hot or cold days

D) There is not enough information to say

2 / 65

Transformer cannot step up

DC voltage

AC voltage

None of these

Both a and b

3 / 65

Electric Generators work on the principle of:

Coulomb's law

Newton's law of gravitation

Ampere's law

Electromagnetic Induction

4 / 65

Choose the correct arrangement of the various regions of the electromagnetic spectrum in terms of wave length.

ETEA 2017
Physics
Electromagnetic Waves
Elimination Tool:

A) Ir>uv> visible > microwave > radio frequency

B) Microwave >ir> visible >uv> radio frequency

C) Radio frequency > microwave >ir> visible >uv

D) Visible >ir>uv> microwave > radio wave

5 / 65

Unit of induced emf is

Volts

Ampere

Newton

Joule

6 / 65

Microwaves are _______ waves.

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Tranverse

B) Electromagnetic

C) Longitudinal

D) Transverse and electromagnetic

7 / 65

Which of the following does not travel in vacuum?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Transverse waves

B) Radio waves

C) Sound waves

D) Light rays

8 / 65

The direction of induced emf is given by which of the following law?

Faraday law

Lenz law

Ampere law

None

9 / 65

The distance between two consecutive nodes is:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Half a wavelength

B) Two wavelengths

C) One-fourth the wavelength

D) One wavelength

10 / 65

Microwave is:

2022 PMC Test 3
Physics
Electromagnetic Waves
Elimination Tool:

A) An electromagnetic wave

B) Sound wave

C) Longitudinal wave

D) Standing wave

11 / 65

If Ns/Np is the turn ratio, then for step up transformer

Ns > Np

Ns = Np

Ns < Np

None

12 / 65

Germanium and silicon are semiconductors having crystalline structures. Both these materials have ______ valence electrons in their outermost shells.

NTS 2014
Physics
Electromagnetic Waves
Elimination Tool:

A) 2

B) 4

C) 6

D) 8

13 / 65

If the current flow increases to 100 times, the energy stored in the inductor will increase to:

100 times

1,000 times

10,000 times

Remains same

14 / 65

A D.C generator is converted in A.C generator by

Increasing the rings

Replacing split rings by slip rings

none

Decreasing the rings

15 / 65

A.C generator can be converted into D.0 generator by

Slip rings

Split rings

Stopper

Cannot be converted

16 / 65

The light we see is:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) None of these

B) Infrared

C) Visible

D) Ultraviolet

17 / 65

The electromagnetic radiation which moves with high frequency will have _______ wavelength:

2022 PMC Test 3
Physics
Electromagnetic Waves
Elimination Tool:

A) Short

B) Long

C) Unchanged

D) Variable

18 / 65

Infrasonic waves have a frequency of:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Greater than 20000 Hz

B) Less than 20 Hz

C) 20 Hz

D) Greater than 20 Hz

19 / 65

Resistance opposes current, inductor opposes

Current

Change in current

emf of a battery

All

20 / 65

When carrying electricity on long distances. Step up transformer are used to:

Increase both voltage and current

Increase voltage reduce current

Increase current reduce voltage

None of these

21 / 65

Torsion balance is used to measure:

Spring constant

Electric force

Gravitational constant

All

22 / 65

potential difference in charge between two points in a circuit is known as?

Emf

Electric difference

Intensity

Volt

23 / 65

Which of the following statement is true? i) Toroid is a solenoid bent into circular path ii) Solenoid is a tarok’ in open

i is true

ii is true

Both a and b

None of these

24 / 65

Which of the following phenomenon proves that light waves are transverse waves?

PMC Practice 4
Physics
Electromagnetic Waves
Elimination Tool:

A) Polarization

B) Refraction

C) Interference

D) Diffraction

25 / 65

Which rays are used in LASER?

PMC 2021 Tested
Physics
Electromagnetic Waves
Wave Motion and Sound
Elimination Tool:

A) Electromagnetic radiation

B) Black body radiation

C) Alpha rays

D) Beta rays

26 / 65

Beta rays cannot be stopped by:

PMC Practice 11
Physics
Electromagnetic Waves
Elimination Tool:

A) Paper

B) Water

C) Air

D) All of these options are correct

27 / 65

The region that lies between IR and UV regions is called:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Radio waves

B) None of these

C) X ray region

D) Visible light

28 / 65

In microwave ovens ____ is used to heat the food

PMC Practice 33
Physics
Electromagnetic Waves
Elimination Tool:

A) X-rays

B) Beta rays

C) Gamma rays

D) Electromagnetic rays

29 / 65

Orange light in a vacuum has a wavelength of 600 nm. What is the frequency of this light?

ETEA 2018
Physics
Electromagnetic Waves
Elimination Tool:

A) 180 Hz

B) 5.0 × 105 Hz

C) 1.8 × 1011 Hz

D) 5.0 × 1014 Hz

30 / 65

Which of the following statements is True about the A.0 and D.0 Generators?

Slip Rings for A.C and Split rings for D.C

Split rings for AC and Slip Rings for D.C

Either Slip rings for A.C or Split rings for D.C

Either Split rings for A.C or Slip rings for D.C

31 / 65

Sound waves are:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Both

B) Neither

C) Transverse

D) Longitudinal

32 / 65

Energy emitted in the form of visible radiation is called:

2022 PMC Test 1
Physics
Electromagnetic Waves
Elimination Tool:

A) Light energy

B) Sound energy

C) Tidal energy

D) Geothermal energy

33 / 65

Induced emf depends upon:

Magnetic force

All of these

34 / 65

Polarization explains light is ———

PMC Practice 8
Physics
Electromagnetic Waves
Elimination Tool:

A) Electric in nature

B) Magnetic in nature

C) Both A and B

D) None of these

35 / 65

When a conductor moves In magnetic field the Induced emf Is

Motional

Rotational

Transferal

All of these

36 / 65

Polarization of light shows that it is:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Magnetic in nature

B) None of these

C) Electric in nature

D) Both

37 / 65

A changing electric field produces

emf

Changing magnetic field

Current

None of these

38 / 65

Rays produced by LED are:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Ultraviolet

B) Visible light

C) Infrared

D) All of these

39 / 65

Characteristic x-rays are produced by:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Photons

B) All of these

C) Electrons

D) Protons

40 / 65

A tuning fork A produces 4 beats with another tuning fork B. if the frequency of tuning fork B is 320 Hz, then the frequency of tuning fork A is:

PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:

A) 320 * 4

B) 320 / 4

C) 320+4

D) 320

41 / 65

When interference between thin films occurs, the path difference between two interfering rays is 2t. If ‘n’ is the refractive index of the medium, the bright circles are obtained when ________ with m = 0, 1, 2, 3, …

NUMS 2019 Reconduct
Physics
Electromagnetic Waves
Elimination Tool:

A) (2m + 1) λ = 4nt

B) (2m + 1) λ = 2nt

C) 2m = nt

D) mλ = 2nt

42 / 65

Which of the following is not major application of electromagnetic induction

T.V

Radio

Transformer

Telephone

43 / 65

An electromagnetic wave travels in a straight line through a vacuum. The wave has a frequency of 6.0 THz. What is the number of wavelengths in a distance of 1.0 m along the wave?

ETEA 2018
Physics
Electromagnetic Waves
Elimination Tool:

A) 5.0 × 10–5

B) 2.0 × 101

C) 2.0 × 104

D) 5.0 × 107

44 / 65

Which of the following is CORRECT for photons?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) E= hv

B) E = h/cλ

C) P = h/λ

D) E = mc

45 / 65

A star moving away from earth shows:

PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:

A) Green shift

B) Red shift

C) Blue shift

D) None of these

46 / 65

A stationary wave is formed in a pipe which is open at one end. If length of pipe is L, then what is the maximum possible wavelength of the wave.?

PMC Practice 20
Physics
Electromagnetic Waves
Elimination Tool:

A) L

B) 2L

C) 3L

D) 4L

47 / 65

What will be the energy stored In an inductor of length 2m if a current of 10A passes through it

10J

100J

200J

50J

48 / 65

Which one of the following waves needs a medium to travel?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) X rays

B) Gamma rays

C) None of these

D) Beta rays

49 / 65

Which one of the following requires no medium?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Beta rays

B) Alpha rays

C) Gamma rays

D) All of these

50 / 65

Electromagnetic waves are produced by:

NTS 2012
Physics
Electromagnetic Waves
Elimination Tool:

A) Motion of electric and magnetic fields

B) Chargeless particles

C) A static charge

D) Heat

51 / 65

In water pipes, ____ is used to detect leakages.

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Light

B) Radiation

C) Current

D) None of these

52 / 65

Which list shows electromagnetic waves in order of increasing frequency?

ETEA 2018
Physics
Electromagnetic Waves
Elimination Tool:

A) radio waves → gamma rays → ultraviolet → infra-red

B) radio waves → infra-red → ultraviolet → gamma rays

C) ultraviolet → gamma rays → radio waves → infra-red

D) ultraviolet → infra-red → radio waves → gamma rays

53 / 65

Applications of laser is/are:

NTS 2011
Physics
Electromagnetic Waves
Elimination Tool:

A) to perform precision surveying and length measurements

B) as a potential energy source for including nuclear fusion reactions

C) for telephone communications along optical fibers

D) for precision cutting of metals and other materials

E) all of these

54 / 65

The wave in which crest and trough superimpose each other is ?

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Sound wave

B) Light wave

C) Stationary wave

D) All of these

55 / 65

Which of the following is not E.M wave?

ETEA 2019
Physics
Electromagnetic Waves
Elimination Tool:

A) Radio waves

B) X-rays

C) Light waves

D) Sound waves

56 / 65

Longitudinal standing wave, in second harmonic mode, is established in a tube that is open at both ends. The length of the tube is 0.8m. What is the wavelength of the waves that make up the standing wave?

PMC Practice 10
Physics
Electromagnetic Waves
Elimination Tool:

A) 0.20m

B) 0.40m

C) 0.80m

D) 1.60m

57 / 65

Extraterrestial waves are also called:

PMC 2021 Tested
Physics
Electromagnetic Waves
Elimination Tool:

A) Alpha rays

B) Cosmic rays

C) Gamma rays

D) Beta rays

58 / 65

In medical scanning, which rays are used?

PMC Practice 18
Physics
Electromagnetic Waves
Elimination Tool:

A) Photon

B) X

C) Beta

D) White

59 / 65

Michelson’s interferometer works on the principle of:

PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:

A) Interference of light

B) Refraction of light

C) Reflection of light

D) Diffraction of light

60 / 65

Which electrical quantity cannot be changed by a transformer?

Voltage

Current

Power

Inductance

61 / 65

In single slit diffraction, when wavelength lameda increases:

PMC Practice 20
Physics
Electromagnetic Waves
Elimination Tool:

A) Width of central maxima increases

B) Width of central maxima does not change

C) Central maxima becomes brighter

D) Width of central maxima decreases

62 / 65

The direct exposure of sun light where ozone layer is depleted will cause:

2022 PMC Test 1
Physics
Electromagnetic Waves
Elimination Tool:

A) Skin cancer

B) Sugar

C) Corona

D) Sun burn

63 / 65

A coil is placed near a magnet. Emf will be induced in it when

Area of coil is changed

Coil is rotated

Magnet which was placed at a distance is moved closer to it.

All of these

64 / 65

A sound wave travels from a region of hot air into a region of cold air. How does frequency and wavelength of sound change?

PMC Practice 21
Physics
Electromagnetic Waves
Elimination Tool:

A) Frequency decreases wavelength decreases

B) Frequency increases wavelength decreases

C) Frequency does not change as wavelength decreases

D) Frequency does not change wavelength does not change

65 / 65

X-rays are used to measure?

PMC Practice 8
Physics
Electromagnetic Waves
Elimination Tool:

A) Fractures

B) Temperature

C) Blood pressure

D) All of these

Your score is

The average score is 60%

Importance of Electromagnetic Induction MCQs

Electromagnetic Induction helps students understand how changing magnetic fields produce electric currents, which is crucial for solving numerical problems. Moreover, exam questions often test direction of induced current, calculation of EMF, and application of laws. Practicing topic-wise MCQs and short tests improves both speed and accuracy. As a result, students gain confidence for competitive entry tests.

Effective Strategy for Free Preparations

For best results, students should revise formulas, understand the concepts, and solve chapter-wise MCQs regularly. In addition, attempting free tests and past papers helps identify repeated question patterns. PLS Academy provides structured resources that support students in free entry test preparations for Physics Electromagnetic Induction and other Class 12 Physics chapters.

JazakAllah.