| 1. | We can induce the current in a coil by ? | |
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by changing the orientation of the coil in the magnetic field
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by changing the magnetic field around it
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moving the coil in a magnetic field
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All of above
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Report Question| 2. | What should be the core of an electromagnet ? | |
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rusted iron
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hard iron
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soft iron
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none of above
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| 3. | Which colour wire is used for earthing ? | |
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Red
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Green or yellow
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Blue
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none of these
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| 4. | How many magnetic poles are there in a current carrying solenoid ? | |
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six
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one
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two
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four
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| 5. | The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is ? | |
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Downwards
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Upwards
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Anticlockwise
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Clockwise
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| 6. | Read the following sentences carefully, and choose the correct one ? | |
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If a wire (in the form of a coil) is kept fixed, but a magnet is moved inside it, even then a current is produced in the coil of wire.
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A generator uses the movement or rotation of a rectangular coil of wire between the poles of a horseshoe magnet to produce an electric current.
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The direction of induced current can also be reversed by reversing the direction of magnetic field.
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All the above.
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| 7. | Switches are connected to ? | |
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earth wire.
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neutral wire.
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live wire.
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any one.
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| 8. | What is that instrument which can detect the presence of electric current in a circuit ? | |
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generator
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galvanometer
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motor
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none of above
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| 9. | A.C generator works on the principle of ? | |
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force experience by a charge particle in electric field.
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electrostatic
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force experience by a conductor in magnetic field
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electromagnetic induction
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| 10. | A current through a horizontal power line flows from south to North direction. The direction of magnetic field line 0.5m above it is ? | |
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East
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West
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North
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South
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