Entry Test MCQ :: Optical Instruments
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| 31. |
The value of critical angle for glass is |
Answer: Option A
Explanation:
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| 32. |
In optic fiber transmission system __________ are used regenerate the dim light signal. |
| A. |
Diodes |
B. |
Repeaters |
| C. |
Laser |
D. |
Transformer |
Answer: Option B
Explanation:
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| 33. |
Magnification of the astronomical telescope is |
| A. |
fo+fe |
B. |
fo/fe |
| C. |
fe/fo |
D. |
(1+fo/fe)L/fo |
Answer: Option B
Explanation:
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| 34. |
The equation ?min = 1.22 ?/D was devised by |
| A. |
Newton |
B. |
Einstein |
| C. |
Raleigh |
D. |
Planks |
Answer: Option C
Explanation:
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| 35. |
A convex lens acts as a diverging lens if the |
| A. |
object is beyond C |
B. |
if the object is with in C |
| C. |
if the object is within f |
D. |
both (b) and (c) |
Answer: Option D
Explanation:
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| 36. |
Michelson calculated the speed of light using the instruments |
| A. |
spectrometer |
B. |
galvanometer |
| C. |
interferometer |
D. |
none of these |
Answer: Option A
Explanation:
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| 37. |
Michelson devised the formula to calculate the speed of light |
| A. |
C = 4fd |
B. |
C = 8fd |
| C. |
C = 16fd |
D. |
C = 5/2fd |
Answer: Option C
Explanation:
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| 38. |
The function of collimeter in spectrometer is |
| A. |
to produce parallel beams of light |
B. |
to filter the light rays |
| C. |
to make them |
D. |
no function |
Answer: Option A
Explanation:
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| 39. |
In optic fiber transmission the repeater are separated through a distance of ______ km in newer system. |
Answer: Option C
Explanation:
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| 40. |
Errors in the transmission of power through optic fiber can be minimized by using a |
| A. |
Multimode index fiber |
B. |
Graded index fiber |
| C. |
Single mode step index fiber |
D. |
Copper wire |
Answer: Option B
Explanation:
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