Entry Test MCQ :: Physical Optics
|
|
|
|
|
11. |
A point source of light placed in a homogeneous medium gives rise to |
A. |
a cylindrical wave front |
B. |
an elliptical wave front |
C. |
a spherical wave front |
D. |
a plane wave front |
Answer: Option C
Explanation:
|
12. |
The locus of all points in a medium having the same phase of vibration is called |
A. |
crest |
B. |
trough |
C. |
wavelength |
D. |
wave front |
Answer: Option D
Explanation:
|
13. |
Which one of the following is nearly monochromatic light ? |
A. |
light form fluorescent tube |
B. |
light form neon lamp |
C. |
light form sodium lamp |
D. |
light form simple lamp |
Answer: Option C
Explanation:
|
14. |
Two sources of light are coherent if they emit rays of |
A. |
same wavelength |
B. |
same amplitude of vibration |
C. |
same wave length with constant phase difference |
D. |
same amplitude and wavelength |
Answer: Option C
Explanation:
|
15. |
When crest of one wave falls over the trough of the other wave this phenomenon is known as |
A. |
polarization |
B. |
constructive interference |
C. |
destructive interference |
D. |
diffraction |
Answer: Option C
Explanation:
|
16. |
In Youngs double slit experiment the fringe spacing is equal to |
Answer: Option C
Explanation:
|
17. |
In Young double slit experiment, if white light is used |
A. |
alternate dark and bright fringes will be seen |
B. |
coloured fringes will be seen |
C. |
no interference fringes will be seen |
D. |
impossible to predict |
Answer: Option B
Explanation:
|
18. |
The velocity of light was determined accurately by |
A. |
Newton |
B. |
Michelson |
C. |
Huygen |
D. |
Young |
Answer: Option B
Explanation:
|
19. |
The condition for constructive interference of two coherent beams is that the path difference should be |
A. |
integral multiple of ?/2 |
B. |
integral multiple of ? |
C. |
odd integral multiple of ?/2 |
D. |
even integral multiple of ? |
Answer: Option B
Explanation:
|
20. |
In an interference pattern |
A. |
bright fringes are wider than dark fringes |
B. |
dark fringes are wider than bright fringe |
C. |
both dark and bright fringes are of equal width |
D. |
central fringes are brighter than the outer fringes |
Answer: Option C
Explanation:
|
Read more:
|
|