| 1 |
The types of optical fibres are |
- A. Three
- B. Four
- C. Five
- D. Six
|
| 2 |
If an object lies at focus point F in front of a converd lens, its image is formed at. |
- A. 2F
- B. F
- C. 3F
- D. Infinity
|
| 3 |
The speed of light was measured correctly by |
- A. Galileo
- B. Michelson
- C. Newton
- D. Maxwell
|
| 4 |
The first person who attempted to measure the speed of light was. |
- A. Michelson
- B. Hygen's
- C. Galileo
- D. Ability
|
| 5 |
The accepted value for speed of light in vacuum |
- A. 2.99 x 10<sup>8</sup>m - sec<sup>-1</sup>
- B. 2.99 x 10<sup>6</sup>m - sec<sup>-1</sup>
- C. 2.99 x 10<sup>8</sup>km - sec<sup>-1</sup>
- D. 2.99 x 10<sup>8</sup>m - h<sup>-1</sup>
|
| 6 |
A layer over the central core of the jacke is called. |
- A. Jacket
- B. Plastic
- C. Cladding
- D. Rubber
|
| 7 |
The focal length of a concave lens is always |
- A. +ve
- B. -ve
- C. Zero
- D. None of these
|
| 8 |
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
|
| 9 |
The focal length of convex lens |
- A. Negative
- B. Positive
- C. small
- D. Large
|
| 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
|