Electricity / Electronics
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Avg score: 23% • Most missed: “In our homes, electricity is supplied at 220 V AC. The value 220 represents”
Electricity / Electronics
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25 Questions

1. Effect of light on photocells produces
2. An energy source will supply a constant current into the load if its internal resistance is
3. In our homes, electricity is supplied at 220 V AC. The value 220 represents
4. Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case will be.
5. Which one of the following is not a semiconductor?
6. A parallel-plate capacitor, with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become.
7. A 100 W bulb is kept on for 10 h per day in September. The electrical energy consumed in that month in kilowatt hours (kwh) is
8. A capacitor (condenser) is used in an electrical circuit in order to
9. To draw maximum current from a combination of cells, how should the cells be grouped?
10. Transformers are used in
11. A fuse wire is used to
12. Transformer is based upon the principle of
13. Superconductors are substances which
14. The function of the choke is to
15. Holes in a semiconductor behave as though they have
16. Rectifiers are used to convert
17. Two bulbs of 100W and 60W are operating on 220 V line. The ratio of their resistance is
18. Electrical energy generated at a power plant is delivered to distant places over long transmission cables at a very high alternating voltage of about 3,30,000 V. The reason for this is that
19. When a piece of pure silicon is doped with aluminium then
20. Thermoelectric current produced is large when
21. When a semiconductor is heated, its resistance
22. When a current flowing through a resistance increases four times, the heat developed will increase
23. When a capacitor is connected to a battery
24. In electric fittings, the wires are earthed because
25. A transformer is used to

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