#### Electric Charge and Electric Current Model Question Paper

9th Standard

Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
5 x 1 = 5
1. Rubbing of comb with hair

(a)

creates electric charge

(b)

transfers electric charge

(c)

either (a) or (b)

(d)

neither (a) nor (b)

2. In an electrolyte the current is due to the flow of

(a)

electrons

(b)

positive ions

(c)

both (a) and (b)

(d)

neither (a) nor (b)

3. The following is not a safety device.

(a)

Fuse

(b)

Trip switch

(c)

Ground connection

(d)

Wire

4. In India the frequency of alternating current is

(a)

220 Hz

(b)

50 Hz

(c)

5 Hz

(d)

100 Hz

5. The resistance of a straight conductor is independent of__________

(a)

temperature

(b)

material

(c)

cross sectional area

(d)

shape of cross section

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

()

lower, higher

8. The e.m.f of a cell is analogues to________of a pipe line.

()

water pump

9. Trip switch is a______________safety device

()

electro mechanical

10. __________is the only non-metal that is a good conductor of electricity

()

Graphite

11. _________is work done per unit charge

()

Potential difference

12. 5 x 1 = 5
13. Electrically neutral means it is either zero or equal positive and negative charges

(a) True
(b) False
14. The anode in electrolyte is negative

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

(a) True
(b) False
16. A fuse is used in electric circuit to stop high current flowing through the circuit

(a) True
(b) False
17. A comb rubbed with hair and brought near pieces of paper attracts them, because both comb and paper get similarly charged

(a) True
(b) False
18. 7 x 1 = 7
19. Electric Charge

20. (1)

ampere

21. Electric field

22. (2)

Volt

23. Electric current

24. (3)

Copper

25. Connecting wire

26. (4)

newton per coulomb

27. Potential difference

28. (5)

coulomb

29. Electrical energy

30. (6)

Joule

31. Potential difference

32. (7)

Voltmeter

5 x 2 = 10
33. What is the SI unit for current?

34. Name a device that helps to maintain a potential difference a cross a conductors

35. What do the circuit symbol  represent?

36. What is the charge of one electron?

37. How is a voltmeter connected in the circuit to measure the potential difference between two points?

38. 4 x 2 = 8
39. On what factors does the electrostatic force between two charges depend?

40. Define electric field.

41. A bird sitting on a high power electric line is still safe. How?

42. Two resistors 12$\Omega$ and 6$\Omega$ are first connected in series and then in parallel. The current-voltage graph for the two connections will be represented by which lines in the graph?