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#### Electricity Book Back Questions

10th Standard EM

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
3 x 1 = 3
1. Which of the following is correct?

(a)

Rate of change of charge is electrical power

(b)

Rate of change of charge is current.

(c)

Rate of change of energy is current.

(d)

Rate of change of current is charge.

2. In a simple circuit, why does the bulb glow when you close the switch?

(a)

The switch produces electricity

(b)

Closing the switch completes the circuit.

(c)

Closing the switch breaks the circuit.

(d)

The bulb is getting charged.

3. Kilowatt hour is the unit of

(a)

resistivity

(b)

conductivity

(c)

electrical energy

(d)

electrical power

4. 1 x 1 = 1
5. The purpose of a rheostat is __________.

()

to vary the magnitude of current

6. 4 x 1 = 4
7. electric current

8. (1)

volt

9. potential difference

10. (2)

watt

11. specific resistance

12. (3)

ampere

13. electrical power

14. (4)

ohmmeter

2 x 2 = 4
15. Define the unit of current.

16. Name any two devices, which are working on the heating effect of the electric current.

17. 1 x 4 = 4
18. An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?

19. 1 x 7 = 7
20. a) What are the advantages of LED TV over the normal TV?
b) List the merits of LED bulb.

21. 1 x 7 = 7
22. Three resistors of 1 Ω, 2 Ω and 4 Ω are connected in parallel in a circuit. If a 1 Ω resistor draws a current of 1 A, find the current through the other two resistors.