| 1 |
Which part of a D.C. motor reverses the direction of current through the coil every half-cycle. |
- A. The armature
- B. The commutator
- C. The burshes
- D. The slip rings
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| 2 |
<p class="MsoNormal">To see from submarine and the ship at the surface of water,
we use:<o:p></o:p></p> |
- A. <p class="MsoNormal">Telescope<o:p></o:p></p>
- B. <p class="MsoNormal">Microscope<o:p></o:p></p>
- C. <p class="MsoNormal">Periscope<o:p></o:p></p>
- D. <p class="MsoNormal">Prism<o:p></o:p></p>
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| 3 |
The presence of a magnetic field can be detected by a |
- A. small mass
- B. Stationary positive charge
- C. Stationary negative charge
- D. Magnetic compass
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| 4 |
<p class="MsoNormal">The refracted light striking to the side of prism is called:<o:p></o:p></p> |
- A. <p class="MsoNormal">Refracted ray<o:p></o:p></p>
- B. <p class="MsoNormal">Incident ray<o:p></o:p></p>
- C. <p class="MsoNormal">Reflected ray<o:p></o:p></p>
- D. <p class="MsoNormal">Emergent ray<o:p></o:p></p>
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| 5 |
Iron core is used in tranformer to: |
- A. Enhance the flux
- B. Decrease the flux
- C. Keep flux the same
- D. botha a and b
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| 6 |
<p class="MsoNormal">When we heat the metal at high temperature they emit:<o:p></o:p></p> |
- A. <p class="MsoNormal">Holes<o:p></o:p></p>
- B. <p class="MsoNormal">Protons<o:p></o:p></p>
- C. <p class="MsoNormal">Neutrons<o:p></o:p></p>
- D. <p class="MsoNormal">Electrons<o:p></o:p></p>
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| 7 |
Transformer Works on the principle of: |
- A. Self induction
- B. Mutual induction
- C. Electro statatic
- D. Induction
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| 8 |
The direction of induced e.m.f. in a circuit is in accordance with conservation of. |
- A. Mass
- B. Charge
- C. Momentum
- D. Energy
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| 9 |
<p class="MsoNormal">A positive electric charge:<o:p></o:p></p> |
- A. <p class="MsoNormal">Attracts other positive charge<o:p></o:p></p>
- B. <p class="MsoNormal">Repels other positive charge<o:p></o:p></p>
- C. <p class="MsoNormal">Attract a neutral charge<o:p></o:p></p>
- D. <p class="MsoNormal">Repels a neutral charge<o:p></o:p></p>
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| 10 |
<p class="MsoNormal">The instrument which is used to display the magnitude of
changing electric current is called:<o:p></o:p></p> |
- A. <p class="MsoNormal">Evacuated tube<o:p></o:p></p>
- B. <p class="MsoNormal">Cathode rays oscilloscope<o:p></o:p></p>
- C. <p class="MsoNormal">Television tube<o:p></o:p></p>
- D. <p class="MsoNormal">Picture tube<o:p></o:p></p>
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