Engineering Physics II Mock Test 4

10%

Question 1 of 10

1. What is the other name for a maximum external incident angle?

Total internal reflection angle

Refraction angle

Optical angle

Wave guide acceptance angle

Question 1 of 10

Question 2 of 10

2. Which of the following component is not used during the production of circularly polarized light?

Half-wave plate

Quarter-wave plate

Light source

Nicol Prism

Question 2 of 10

Question 3 of 10

3. Lasers are used for welding of wires because they can be focused onto a fine spot.

False

True

Question 3 of 10

Question 4 of 10

4. Calculate the number of photons, from green light of mercury (ʎ = 4961 Å), required to do one joule of work.

2.4961/m

4524.2×10¹⁸/m³

2.4961/m³

2.4961×10¹⁸/m³

Question 4 of 10

Question 5 of 10

5. For an ordinary light source, the coherence time t = 10^-10 s. The degree of Monochromaticity for a wavelength of 6000 Å is ___________

0.1 X 10^-4

0.2 X 10^-4

0.3 X 10^-4

0.4 X 10^-4

Question 5 of 10

Question 6 of 10

6. A fibre optic telephone transmission can handle more than thousands of voice channels.

True

False

Question 6 of 10

Question 7 of 10

7. For what wavelength would a half wave plate behave as a half wave plate?

3λ

Never

2λ

λ/2

Question 7 of 10

Question 8 of 10

8. What should be the phase difference between the two plane-polarized waves, vibrating at right angles to each other, to produce circularly polarized light?

π/4

π/6

π/3

π/2

Question 8 of 10

Question 9 of 10

9. Which of the two rays are polarized?

Neither X and Y

Both X and Y

Question 9 of 10

Question 10 of 10

10. How does the refractive index vary in Graded Index fibre?

Tangentially

Transversely

Longitudinally

Radially

Question 10 of 10