| 1 |
In totally reflecting prism one angle is of 90<sup>o</sup>, and other two angles are of: |
- A. 30<sup>o</sup>,30<sup>o</sup>
- B. 45<sup>o</sup>,90<sup>o</sup>
- C. 45<sup>o</sup>,45<sup>o</sup>
- D. 40<sup>o</sup>,40<sup>o</sup>
|
| 2 |
Snell' law is: |
- A. n = sin<x/sin <r
- B. n=sin <i/sin<r
- C. n = sin <r/sin<i
- D. <i/<r
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| 3 |
To see from submarine the ship at the surface of water , we use: |
- A. Telescope
- B. Microscope
- C. Peri scope
- D. Prism
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| 4 |
Critical angle for diamond is: |
- A. 60<sup>o</sup>
- B. 24<sup>o</sup>
- C. 26<sup>o</sup>
- D. 49<sup>o</sup>
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| 5 |
<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>
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| 6 |
<p class="MsoNormal">The loudness of a sound is most closely related to its:<o:p></o:p></p> |
- A. <p class="MsoNormal">Frequency<o:p></o:p></p>
- B. <p class="MsoNormal">Period<o:p></o:p></p>
- C. <p class="MsoNormal">Wavelength<o:p></o:p></p>
- D. <p class="MsoNormal">Amplitude<o:p></o:p></p>
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| 7 |
<p class="MsoNormal">CD which is made of soft material is called:<o:p></o:p></p> |
- A. <p class="MsoNormal">Hard disk<o:p></o:p></p>
- B. <p class="MsoNormal">Floppy disk<o:p></o:p></p>
- C. <p class="MsoNormal">Iron disk<o:p></o:p></p>
- D. <p class="MsoNormal">Copper disk<o:p></o:p></p>
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| 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
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| 9 |
<p class="MsoNormal">How does sound travel from its source to your ear:<o:p></o:p></p> |
- A. <p class="MsoNormal">By changes in air pressure<o:p></o:p></p>
- B. <p class="MsoNormal">By vibration in wires or strings<o:p></o:p></p>
- C. <p class="MsoNormal">By electromagnetic waves<o:p></o:p></p>
- D. <p class="MsoNormal">By infrared waves<o:p></o:p></p>
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| 10 |
The distance of spherical mirror is called: |
- A. Curvature
- B. Aperture
- C. Sphere
- D. a,b
|
