1. A motor converts
(a) Mechanical energy into electrical energy
(b) Mechanical energy into sound energy
(c) Electrical energy into mechanical energy
(d) Electrical energy into sound energy
2. A dynamo converts
(a) Mechanical energy into sound energy
(b) Mechanical energy into electrical energy
(c) Electrical energy into mechanical energy
(d) Electrical energy into sound energy
3. By inserting a soft iron piece into a solenoid, the strength of the magnetic field
(a) Increases
(b) Decreases
(c) First increases then decreases
(d) Remains unchanged
4. In a hydel station, the motion produced in turbines is due to the
(a) Burning of coal
(b) Burning of diesel
(c) Flow of water
(d) Production of steam
5. At grid sub-stations the voltage is stepped up to reduce loss of
(a) Current
(b) Electrical energy
(c) Power
(d) Resistance
6. Laws of heating are given by
(a) Joule
(d) Ohm
(c) Maxwell
(d) Faraday
7. An electric bulb coverts electrical energy into
(a) Sound energy
(b) Mechanical energy
(c) Nuclear energy
(d) None of these
8. The wire having a red plastic covering is a
(a) Live wire
(b) Neutral wire
(c) Earth wire
(d) None of these
9. The wire having a black plastic covering is a
(a) Live wire
(b) Neutral wire
(c) Earth wire
(d) None of these
10. The wire having a green plastic covering is a
(a) Live wire
(b) Neutral wire
(c) earth wire
(d) None of these
11. An electric fuse works on the --------- effect of current.
(a) Heating
(b) Magnetic
(c) Chemical
(d) None of these
12. The touching of the live and neutral wire directly is known as
(a) Power rating
(b) Short circuit
(c) Overloading
(d) None of these
13. A fuse wire is generally made of
(a) Silver
(b) Tin-lead alloy
(c) Copper
(d) Either (a) or (b)
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