Class 12 Physics MCQ Chapter 8 Electromagnetic Waves

Class 12 Physics MCQ Chapter 8 Electromagnetic Waves Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 8 Electromagnetic Waves Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.

Class 12 Physics MCQ Chapter 8 Electromagnetic Waves

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.

Electromagnetic Waves

Chapter: 8

MCQs

Choose the correct option:

1. If a source is transmitting electromagnetic waves of frequency 8.2 × 10⁶ Hz, then wavelength of the electromagnetic waves transmitted from the source will be:

(a) 36.6 m

(b) 40.5 m

(c) 42.3 m

(d) 50.9 m

Ans: (a) 36.6 m

2. Is the ratio of frequencies of UV rays and IR rays in the glass more than, less than or equal to 1?

(a) Insufficient data.

(b) Equal to 1.

(c) Less than 1.

(d) More than 1.

Ans: (d) More than 1. 

3. In an electromagnetic wave, the electric and magnetic fields are 100 Vm^-1 and 0.265 Am^-1. The maximum energy flow is:

(a) 26.5 Wm^-2

(b) 36.5 Wm²

(c) 46.7W × m^-2

(d) 76.5W × m^-2

Ans: (b) 36.5 Wm²

4. If the wavelength of electromagnetic radiation is doubled, what will happen to the energy of photons?

(a) Doubled.

(b) Halved.

(c) Remains the same.

(d) Becomes zero.

Ans: (b) Halved.

5. The phase and orientation of the magnetic vector associated with electromagnetic oscillations differ respectively from those of the corresponding electric vector by:

(a) Zero and zero.

(b) Zero and 𝜋/2.

(c) 𝜋/2 and 𝜋/2.

(d) 𝜋/2 and zero.

Ans: (d) 𝜋/2 and zero.

6. The amplitudes of electric and magnetic fields in an electromagnetic wave are related to each other as:

(a) E₀ = B₀

(b) E₀ = cB₀

(c) E₀ = B₀ / c

(d) E₀ = c/B

Ans: (b) E₀ = cB₀

7. ________ has a minimum wavelength?

(a) Blue light.

(b) gamma-rays.

(c) infrared rays.

(d) microwave.

Ans: (b) gamma-rays.

8. The distance upto which a TV signal can be transmitted depends upon:

(a) Radius of earth only.

(b) Height of antenna only.

(c) Radius of earth and height of antenna.

(d) None of the above.

Ans: (c) Radius of earth and height of antenna.

9. The electromagnetic waves do not transport:

(a) Charge.

(b) Energy.

(c) Momentum.

(d) Information.

Ans: (a) Charge.

10. The amplitude of electric and magnetic fields related to each other are

(a) E₀ = B₀

(b) E₀ = CB₀

(c) E₀ = B₀ / C

(d) E₀ = C / B₀

Ans: (b) E₀ = CB₀

11. ______ waves used by artificial satellites for communication

(a) Micro.

(b) Infrared waves.

(c) Radio waves.

(d) None of the above.

Ans: (a) Micro.

12. In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2 × 10¹⁰ Hz and amplitude is 48 Vm^-1. The amplitude of oscillating magnetic field is:

(a) 3.2 × 10^-8 T.

(b) 3 × 10⁷ T.

(c) 16 × 10^-7 T.

(d) 1.6 × 10^-7 T.

Ans: (d) 1.6 × 10^-7 T.

13. The charging current for a capacitor at any instant is 0.25 At The displacement current across the capacitor plates at that instant is):

(a) 0.5 A.

(b) 0.25 A.

(c) 2.5 A.

(d) 1 A.

Ans: (b) 0.25 A.

14. Out of the following options which one can be used to produce a propagating electromagnetic wave?

(i) A stationary charge.               

(ii) A chargeless particle.

(iii) An accelerating charge.         

(iv) A charge moving at constant velocity.

Ans: (iii) An accelerating charge. 

15. Electromagnetic waves are:

(a) Transverse waves.

(b) Longitudinal waves.

(c) Produced by charges moving with constant velocity.

(d) None of the above.

Ans: (a) Transverse waves.