| 1 |
Multimode step index fibre is useful for |
- A. Long distances
- B. Short distances
- C. Better quality
- D. Low price
|
| 2 |
The final image seen through ey piece in telescope is. |
- A. Real, enlarge and inverted
- B. Vertual, enlarge and erect
- C. Virtual, enlarge and inverted
- D. In Real, enlarge and erect
|
| 3 |
Critical angle is that angle of incident ofr which angle of refraction is. |
- A. 90 <sup>o</sup>
- B. 45 <sup>o</sup>
- C. 42 <sup>o</sup>
- D. 24 <sup>o</sup>
|
| 4 |
For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively. |
- A. 10 cm
- B. 20 cm
- C. 5 cm
- D. 120 cm
|
| 5 |
The diameter of a lens is called |
- A. Focal length
- B. Aperture
- C. Principle axis
- D. Centre
|
| 6 |
A double convex lens acts as diverging lens when the object is |
- A. At infinity
- B. Inside the focus
- C. A way from focus
- D. A a large distance from lens
|
| 7 |
Using a graded Index fibre, the time difference is reduced to about. |
- A. 1 ns per km
- B. 33 ns per 100 km
- C. 33 ns per km
- D. 1 ns per 100 km
|
| 8 |
The types of optical fibres are |
- A. Three
- B. Four
- C. Five
- D. Six
|
| 9 |
In Michelson's experiment the relation used to find the speed of light is |
- A. 16 fc
- B. 1/16 fd
- C. 16 fd
- D. 16/fd
|
| 10 |
Multimode step index fiber is useful for. |
- A. Long distance
- B. Sort distance
- C. Very long distance
- D. Infinite distance
|