| 1 |
Multimode step index fibre is useful for |
- A. Long distances
- B. Short distances
- C. Better quality
- D. Low price
|
| 2 |
The magnifying power is also called |
- A. Resolving power
- B. Angular magnification
- C. Strength of eye
- D. None of these
|
| 3 |
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
|
| 4 |
The light signal in Opticla fiber must be regenerated by advice called. |
- A. Regenerator
- B. Generator
- C. Repeater
- D. Diode
|
| 5 |
More details of an object can be seen with a microscope by using |
- A. Green light
- B. Red light
- C. Yellow light
- D. Blue light
|
| 6 |
Multimode graded index fibre has a core whose diameter range lie from. |
- A. 5 to 50 micro meter
- B. 50 to 100 micro meter
- C. 40 to 1000 micro meter
- D. 50 to 10,000 micrometer
|
| 7 |
The units of magnifying power of microscope or telescope are. |
- A. Metre
- B. m<sup>-1</sup>
- C. dioptre
- D. No unit
|
| 8 |
If a convex lens is used as a magnifying glass, whcih lens will give higher magnification that has. |
- A. Short size
- B. Long focal length
- C. Large size
- D. Short focal length
|
| 9 |
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
|
| 10 |
Total confined light is obtained by |
- A. Total internal reflection
- B. Refraction of light
- C. Diffraction
- D. Polarization
|
