Engineering Physics II Mock Test 4

10%

Question 1 of 10

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

4524.2×10¹⁸/m³

2.4961/m

2.4961/m³

2.4961×10¹⁸/m³

Question 1 of 10

Question 2 of 10

2. The critical angle for O-ray with respect to Canada balsam is ___________

57°

69°

45.7°

59°

Question 2 of 10

Question 3 of 10

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

Tangentially

Radially

Longitudinally

Transversely

Question 3 of 10

Question 4 of 10

4. A beam of light is incident on a rotating prism. If the intensity of the light changes from a maximum to a minimum (not zero), what is the nature of the incident beam?

Unpolarized

Circularly Polarized

Elliptically Polarized

Plane Polarized

Question 4 of 10

Question 5 of 10

5. When a light is analyzed, following observations are made. What is the nature of the light?

Circularly Polarized

Elliptically Polarized

Partially Polarized

Plane Polarized

Question 5 of 10

Question 6 of 10

6. Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and 1.5 respectively.

0.647852

0.55677

55.77

0.2458

Question 6 of 10

Question 7 of 10

7. DVD uses the laser.

False

True

Question 7 of 10

Question 8 of 10

8. In polariscope, if the two prisms are crossed, what would be the intensity of the transmitted polarized beam?

I_o

1/2 I_o

2 I_o

Question 8 of 10

Question 9 of 10

9. The combination as shown in the figure is called as _____________

Polariscope

Polarimeter

Polaroid

Polarizer and Analyzer

Question 9 of 10

Question 10 of 10

10. A plate which induces the desired amount of phase difference between two rays is known as ____________

Polaroid

Quartz plates

Retardation Plates

Phasor plates

Question 10 of 10