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

9th Standard

Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50
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. Potential near a charge is the measure of its________ to bring a positive charge at that point

(a)

force

(b)

abiility

(c)

tendency

(d)

work

3. Electroplating is an example for

(a)

heating effect

(b)

chemical effect

(c)

flowing effect

(d)

magnetic effect

4. In India the frequency of alternating current is

(a)

220 Hz

(b)

50 Hz

(c)

5 Hz

(d)

100 Hz

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

()

lower, higher

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

()

water pump

8. Trip switch is a______________safety device

()

electro mechanical

9. Resistors are connected in  series, if the resistance of electric circuit is to be__________

()

increased

10. _________is work done per unit charge

()

Potential difference

11. 5 x 1 = 5
12. Electrically neutral means it is either zero or equal positive and negative charges

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

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

(a) True
(b) False
15. For current to flow, one needs an open circuit

(a) True
(b) False
16. Electrons in outer orbits are called free electrons

(a) True
(b) False
17. 7 x 1 = 7
18. Electric Charge

19. (1)

coulomb

20. Potential difference

21. (2)

ampere

22. Electric current

23. (3)

Watt

24. Resistor

25. (4)

volt

26. Current in an electric circuit

27. (5)

Galvanometer

28. Electric power

29. (6)

Volt

30. Potential difference

31. (7)

Constantan

5 x 2 = 10
32. Name the force which acts between two point charges obey Newton's third law.

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. 4 x 2 = 8
38. What are electric lines of force?

39. Define electric field.

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

41. 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?

42. 2 x 3 = 6
43. State Ohm’s law.

44. Name any two appliances which work under the principle of heating effect of current.

45. 1 x 5 = 5
46. Find the value of current in the circuit.