| 1 |
Reapters are placed in new system at distance of. |
- A. 30 km
- B. 50 km
- C. 80 km
- D. 100 km
|
| 2 |
The ratio of size of image and size of object is |
- A. Focal length
- B. Magnification
- C. Resolving power
- D. Principle focus
|
| 3 |
A convex lens acts as diverging lens if the object is placed at |
- A. F
- B. 2F
- C. Between F and 2 F
- D. Within the F
|
| 4 |
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>
|
| 5 |
The magnifying power of a convex lens of focal lendth 10 cm is |
|
| 6 |
The minimum distance from eye at which an object appears to be distinct is |
- A. Near point
- B. Focal length
- C. Image distance from lens
- D. Object distance from lens
|
| 7 |
The light emitted from light emitting diode has wave length. |
- A. 1.1 micro meter
- B. 1.3 micro meter
- C. 1.5 micro meter
- D. 1.7 micro meter
|
| 8 |
A layer over the central core of the jacke is called. |
- A. Jacket
- B. Plastic
- C. Cladding
- D. Rubber
|
| 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 |
The units of magnifying power of microscope or telescope are. |
- A. Metre
- B. m<sup>-1</sup>
- C. dioptre
- D. No unit
|