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#### Electric Charge and Electric Current Book Back Questions

9th Standard

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
4 x 1 = 4
1. In current electricity, a positive charge refers to,

(a)

presence of electron

(b)

presence of proton

(c)

absence of electron

(d)

absence of proton

2. Electroplating is an example for

(a)

heating effect

(b)

chemical effect

(c)

flowing effect

(d)

magnetic effect

3. Resistance of a wire depends on

(a)

temperature

(b)

geometry

(c)

nature of material

(d)

all the above

4. In India the frequency of alternating current is

(a)

220 Hz

(b)

50 Hz

(c)

5 Hz

(d)

100 Hz

5. 3 x 1 = 3
6. Electrons move from__________ potential __________to potential

()

lower, higher

7. The domestic electricity in India is an ac with a frequency of___________Hz

()

50

8. Trip switch is a______________safety device

()

electro mechanical

9. 3 x 1 = 3
10. The anode in electrolyte is negative

(a) True
(b) False
11. Current can produce magnetic field.

(a) True
(b) False
12. Electric fuse works on Joule heating principle

(a) True
(b) False
13. 2 x 2 = 4
14. What are electric lines of force?

15. Define electric field.

16. 2 x 3 = 6
17. The current flowing through a lamp is 0.2A. If the lamp is switched on for one hour, What is the total electric charge that passes through the lamp?

18. The e.m.f of a cell is 1.5V. What is the energy provided by the cell to drive 0.5 C of charge around the circuit?

19. 2 x 5 = 10
20. Draw a circuit with a 2$\Omega$ and 5$\Omega$ resistors in series. Connect another 3$\Omega$ resistor parallel to the above connection.

21. How are the home appliances connected in general, in series or parallel. Give reasons.