| 1 |
The optical fibre is covered for protection by |
- A. Glass jacket
- B. Plastic jacket
- C. Steel jacket
- D. Diamond jacket
|
| 2 |
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
|
| 3 |
The speed of light was measured correctly by |
- A. Galileo
- B. Michelson
- C. Newton
- D. Maxwell
|
| 4 |
If the object is at 5 cm from the lens of simple microscope than its magnifying power will be. |
|
| 5 |
Multimode step index fibre is useful for |
- A. Long distances
- B. Short distances
- C. Better quality
- D. Low price
|
| 6 |
the final image obtained by astronomical telescope is. |
- A. Erect
- B. Virtual
- C. Magnified
- D. All of these
|
| 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 |
__ will travel faster than other through an optical fibre. |
- A. Ultraviolet light
- B. Visible light
- C. Infrared light
- D. White light
|
| 9 |
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
|
| 10 |
If an object is placed with in the focal length of a convex lens, its image is formed. |
- A. Real
- B. Inverted
- C. Virtual
- D. Smaller than object
|