Term 2 Electricity Model Question Paper

7th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 40
    4 x 1 = 4
  1. In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ------------------------

    (a)

    10 A

    (b)

    1 A

    (c)

    10 V

    (d)

    1 V

  2. In the circuit shown, which switches (L, M or N) must be closed to light up the bulb

     

    (a)

    switch L only

    (b)

    switch M only

    (c)

    Switch M and N only

    (d)

    either switch L or switches M and N

  3. Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?

    (a)

    2.5 mA

    (b)

    25 mA

    (c)

    250 mA

    (d)

    2500 mA

  4. In which of the following circuits are the bulb connected in series?

    (a)

    (b)

    (c)

    (d)

  5. 5 x 1 = 5
  6. Electron flow is in the same direction to conventional current flow.

    (a) True
    (b) False
  7. The fuse wire does not melts whenever there is overload in the wiring.

    (a) True
    (b) False
  8. In a parallel circuit, the electric components are divided into branches.

    (a) True
    (b) False
  9. The representation of the electric current is A.

    (a) True
    (b) False
  10. The electrical conductivity of the semiconductor is in between a conductor and an insulator.

    (a) True
    (b) False
  11. 3 x 2 = 6
  12. Water : pipe : : Electric current :-------------

  13. Copper : conductor : : Wood : ---------------

  14. milli ampere: micro ampere : : 10-3A : ------

  15. 3 x 2 = 6
  16. Name the device used to generate electricity.

  17. Define fuse.

  18. Name few insulators

  19. 3 x 3 = 9
  20. Define an electric current.

  21. Differentiate parallel and serial circuits.

  22. Define electrical conductivity.

  23. 2 x 5 = 10
  24. Explain the construction and working of a dry cell.

  25. A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder) and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.
     1)What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?

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