| 1 |
An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located: |
- A. out beyond the centre of curvature.
- B. at the centre of curvature
- C. between the centre of curvature and the focal point
- D. at the focal point
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| 2 |
Focal length for concave mirror is : |
- A. -ve
- B. +ve
- C. same
- D. none of these
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| 3 |
The index of refraction depends on: |
- A. The focal length
- B. The speed of light
- C. the image distance
- D. The object distance
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| 4 |
<p class="MsoNormal">Astronauts in space need to communicate with each other by
radio links because:<o:p></o:p></p> |
- A. <p class="MsoNormal">Sound waves travel very slowly in space<o:p></o:p></p>
- B. <p class="MsoNormal">Sound waves travel very fast in space<o:p></o:p></p>
- C. <p class="MsoNormal">Sound waves cannot travel in space<o:p></o:p></p>
- D. <p class="MsoNormal">Sound waves have low frequency in space<o:p></o:p></p>
|
| 5 |
The ratio of image height to object height is called: |
- A. Linear magnification
- B. Power
- C. Refraction
- D. Radius of curative
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| 6 |
The totally reflectiing prism one angle is of: |
- A. 45<sup>o</sup>
- B. 90<sup>o</sup>
- C. 180<sup>o</sup>
- D. 120<sup>o</sup>
|
| 7 |
The focal length is related to radius of curvature by the formula: |
- A. f = 2R
- B. f = 4R
- C. f = R/2
- D. R = f/2
|
| 8 |
Mathematical relationship between critical angle "C" and refractive index "n" is: |
- A. N = C
- B. N = 1 / sin c
- C. N = 1 / cos c
- D. N = 1 / sin2 c
|
| 9 |
<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>
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| 10 |
Which types of image is formed by a concave lens on a screen? |
- A. Inverted and real
- B. Inverted and virtual
- C. upright and real
- D. Upright and virtual
|