Class 12 Physics MCQ Test – Electromagnetic Waves (Chapter 8) | Full Chapter Test

Class 12 Physics

Chapter 8: Electromagnetic Waves | Full Chapter Test

Time Left: 5:00

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1. Displacement current becomes equal to conduction current when:

Electric field is constant Electric field varies linearly with time Rate of change of electric flux is zero Electric field is zero

2. Ratio of electric to magnetic field in EM wave in vacuum is:

c 1/c c² 1

3. An EM wave has frequency 3×10¹⁵ Hz. It belongs to:

Infrared Visible Ultraviolet X-rays

4. Energy density of EM wave depends on:

Frequency Amplitude of electric field Speed of wave Wavelength only

5. The direction of propagation of EM wave is given by:

E × B B × E Only E Only B

6. Microwaves are mainly used in:

Medical imaging Cooking and radar Sterilization Photography

7. Momentum of EM wave is associated with:

Electric field only Magnetic field only Both fields None

8. Speed of EM wave in medium of permittivity ε and permeability μ:

1/√(εμ) √(εμ) εμ 1/(εμ)

9. X-rays are produced when:

Electrons accelerate Electrons decelerate rapidly Nuclei vibrate Protons move

10. Correct order of increasing wavelength:

γ < X < UV < Visible Visible < UV < X < γ X < γ < UV < Visible UV < Visible < X < γ

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