Characteristics of EM Waves, Class 12 Physics NCERT Solutions

MCQ’s For All Chapters – Physics Class 12th

1. There will be total 10  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. The speed of electromagnetic waves in free space is given by .
Here μ0 is ___________and ε0 is ________________ of free space.

permeability, permittivity

coercivity, permeability

permeability, susceptibility

permittivity, permeability

Your comments:

Question 1 of 10

2. Which region in the electromagnetic spectrum will have the highest speed?

Radio

Visible

All the regions have same speed

Microwaves

Your comments:

Question 2 of 10

3. Which region in the electromagnetic spectrum has the highest frequency?

Frequency is same for the complete spectrum

Gamma Radiation Region

Radio

Visible

Your comments:

Question 3 of 10

4. Electromagnetic waves constitute of

Electric and magnetic field varying in space and time sinusoidally and propagating through space such that the two fields are at 60 degrees to the direction of propagation.

Electric and magnetic field varying in space and time sinusoidally and propagating through space such that the two fields are perpendicular to the direction of propagation.

Electric and magnetic field varying in space and time tangentially and propagating through space such that the two fields are perpendicular to the direction of propagation.

Electric and magnetic field varying in space and time tangentially and propagating through space such that the two fields are perpendicular to the direction of propagation.

Your comments:

Question 4 of 10

5. In electromagnetic waves the ratio of amplitudes of electric field and magnetic field is equal to

(E₀ / 2B₀) = c

(E₀ / B₀)^1/2 = c

(2E₀ / B₀) = c

(E₀ / B₀) = c

Your comments:

Question 5 of 10

6. Which statement is true about electromagnetic waves?

Electromagnetic waves are longitudinal in nature

Electromagnetic waves can travel through vacuum

Velocity of electromagnetic waves is 3 X 10⁹ m/s

Ratio of electric field and magnetic field in electromagnetic field is 2E_rms / B_rms

Your comments:

Question 6 of 10

7. Which of the following is not a use of electromagnetic wave?

In detection of invisible writing

In global warming

In greenhouses to keep plants warm

In warfare for looking through mist and fog

Your comments:

Question 7 of 10

8. Which colour of the visible spectrum has the greatest wavelength?

Blue

Yellow

Red

Violet

Your comments:

Question 8 of 10

9. The electric field for an em wave is: E = E₀sin[(12 x 10¹⁵ t – 4 x 10⁷ x)]. What is the speed of the em waves?

48 x 10⁸ m / s

3 x 10⁸ m / s

4 x 10⁷ m / s

12 x 10¹⁵ m / s

Your comments:

Question 9 of 10

10. is the electric field of an electromagnetic wave that is propagating in the

z direction

x direction

y direction

can be any direction

Your comments:

Question 10 of 10

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