| 1 |
The distance of image from mirror is represented by: |
|
| 2 |
The refractive index of internal coating of optical fibre is: |
- A. 1.56
- B. 1.51
- C. 1.53
- D. 1.58
|
| 3 |
Power of convex lens is 10 D. Its focal length is: |
- A. 100 m
- B. 10 m
- C. 1 m
- D. 0.1 m
|
| 4 |
<p class="MsoNormal">What does the term e-mail stand for:<o:p></o:p></p> |
- A. <p class="MsoNormal">Emergency mail<o:p></o:p></p>
- B. <p class="MsoNormal">Electronic mail</p>
- C. <p class="MsoNormal">Extra mail<o:p></o:p></p>
- D. <p class="MsoNormal">External mail<o:p></o:p></p>
|
| 5 |
Focal length for concave mirror is : |
- A. -ve
- B. +ve
- C. same
- D. none of these
|
| 6 |
The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be: |
- A. Absorbed
- B. Totallly reflected
- C. Partially reflected and partially transmitted
- D. Totally transmitted
|
| 7 |
Concave mirror formula is given by: |
- A. R = 2r
- B. sin<i/sin<r
- C. 1/f=1/p+1/q
- D. 1/f=1/p-1/q
|
| 8 |
The ray of light striking to the side of prism is called: |
- A. refraction ray
- B. incident ray
- C. reflected ray
- D. emergent ray
|
| 9 |
To see from submarine the ship at the surface of water , we use: |
- A. Telescope
- B. Microscope
- C. Peri scope
- D. Prism
|
| 10 |
Half of radius of curvature is called: |
- A. Focal length
- B. Principal focus
- C. Axis
- D. None of these
|
