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)

    Joule

  21. Electric field

  22. (2)

    Volt

  23. Electric current

  24. (3)

    Copper

  25. Connecting wire

  26. (4)

    coulomb

  27. Potential difference

  28. (5)

    newton per coulomb

  29. Electrical energy

  30. (6)

    Voltmeter

  31. Potential difference

  32. (7)

    ampere

    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?

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