| 1. | The main advantage of A.C power transmission over D.C power transmission over’ long distance is ? | |
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easy transformation
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less problem of instability
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less insulation problem
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AC transmit without much loss of energy
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Report Question| 2. | A D.C generator works on the principle of ? | |
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faraday’s law of electromagnetic induction.
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Joule’s law of heating
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ohms law
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none of the above
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| 3. | Magnetic effect of current was discovered by ? | |
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Ampere
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Oersted
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Bohr
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Faraday
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| 4. | Commercial electric motors do not use ? | |
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a soft iron core on which the coil is wound
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a permanent magnet to rotate the armature
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effectively large number of turns of conducting wire in the current carrying coil
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an electromagnet to rotate the armature
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| 5. | The instrument that use to defect electric current in the circuit is known as ? | |
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A.C generator
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galvanometer
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electric motor
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none of the above
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| 6. | The pattern of the magnetic field produced by the straight current carrying conducting wire is ? | |
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in the same direction of current
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circular around the wire
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in the direction opposite to the current
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in the direction parallel to the wire
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| 7. | Magnetic effect of current was discovered by ? | |
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Bohr
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Oersted
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Ampere
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Faraday
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| 8. | A positive charge is moving upwards in a magnetic field directed towards north. The particle will be deflected towards ? | |
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east
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south
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west
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north
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| 9. | The magnetic field is the strongest at ? | |
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south pole.
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north pole.
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middle of the magnet.
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both poles.
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| 10. | No force acts on a current carrying conductor when it is placed ? | |
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far away from the magnetic field
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perpendicular to the magnetic field
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parallel to the magnetic field
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inside a magnetic field
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