| 1 |
<p class="MsoNormal">An object is 14 cm in front of a convex mirror. The image is
5.8 cm behind the mirror. What is the focal length of the mirror:<o:p></o:p></p> |
- A. <p class="MsoNormal">-4.1 cm<o:p></o:p></p>
- B. <p class="MsoNormal">-8.2 cm<o:p></o:p></p>
- C. <p class="MsoNormal">-9.9 cm<o:p></o:p></p>
- D. <p class="MsoNormal">-20 cm<o:p></o:p></p>
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| 2 |
Joule's law is W = ____________________ |
- A. IR/t
- B. IRt<sup>2</sup>
- C. IR<sup>2</sup>t
- D. I<sup>2</sup>Rt
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| 3 |
<p class="MsoNormal">Which of the following quantities is not change during
refraction of light:<o:p></o:p></p> |
- A. <p class="MsoNormal">Its direction<o:p></o:p></p>
- B. <p class="MsoNormal">Its speed<o:p></o:p></p>
- C. <p class="MsoNormal">Its frequency<o:p></o:p></p>
- D. <p class="MsoNormal">Its wavelength<o:p></o:p></p>
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| 4 |
<p class="MsoNormal">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:<o:p></o:p></p> |
- A. <p class="MsoNormal">Absorbed<o:p></o:p></p>
- B. <p class="MsoNormal">Totally reflected<o:p></o:p></p>
- C. <p class="MsoNormal">Partially reflected and partially transmitted<o:p></o:p></p>
- D. <p class="MsoNormal">Totally transmitted<o:p></o:p></p>
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| 5 |
The rate of flow of charge through any cross-sectional area is called: |
- A. potential difference
- B. Energy
- C. Coulomb
- D. Electric current
|
| 6 |
Current is equal to: |
- A. IR<sup>2</sup>
- B. CV
- C. Q/t
- D. IR
|
| 7 |
That period in which voltage repeats its value in equal intervals is called: |
- A. cycle
- B. Time period
- C. Frequency
- D. Amplitude
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| 8 |
<p class="MsoNormal">The distance between principal focus and pole of mirror is
called:<o:p></o:p></p> |
- A. <p class="MsoNormal">Principal focus<o:p></o:p></p>
- B. <p class="MsoNormal">Focal length<o:p></o:p></p>
- C. <p class="MsoNormal">Aperture<o:p></o:p></p>
- D. <p class="MsoNormal">Image<o:p></o:p></p>
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| 9 |
<p class="MsoNormal">An object is placed at the Centre of curvature of a concave
mirror. The image produced by the mirror is located:<o:p></o:p></p> |
- A. <p class="MsoNormal">Out beyond the centre of curvature<o:p></o:p></p>
- B. <p class="MsoNormal">At the centre of curvature<o:p></o:p></p>
- C. <p class="MsoNormal">Between the centre of curvature and the focal point<o:p></o:p></p>
- D. <p class="MsoNormal">At the focal point<o:p></o:p></p>
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| 10 |
Battery converts chemical energy into which energy: |
- A. Mechanical
- B. Electrical
- C. Thermal
- D. None of these
|