Current Electricity One Mark Questions

12th Standard EM

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Physics

Time : 00:30:00 Hrs
Total Marks : 10
    5 x 1 = 5
  1. A toaster operating at 240 V has a resistance of 120 Ω. Th e power is

    (a)

    400 W

    (b)

    2 W

    (c)

    480 W

    (d)

    240 W

  2. A carbon resistor of (47 ± 4.7 ) k Ω to be marked with rings of diff erent colours for its identifi cation. Th e colour code sequence will be

    (a)

    Yellow – Green – Violet – Gold

    (b)

    Yellow – Violet – Orange – Silver

    (c)

    Violet – Yellow – Orange – Silver

    (d)

    Green – Orange – Violet - Gold

  3. When 'n' resistors of equal resistance (R) are connected in series and in parallel respectively,then the ratio of their effective resistance is

    (a)

    1: n2

    (b)

    n2: 1

    (c)

    n: 1

    (d)

    1: n

  4. Which of the following has negative temperature coefficient of resistance?

    (a)

    copper

    (b)

    tungsten

    (c)

    carbon

    (d)

    silver

  5. The temperature co-efficient of resistance for alloys is

    (a)

    low

    (b)

    very low

    (c)

    high

    (d)

    very high

  6. 5 x 1 = 5
  7. Electrical Lamp

  8. (1)

    Tungsten

  9. Current

  10. (2)

    ampere

  11. Resistance

  12. (3)

    watt

  13. Power

  14. (4)

    joule

  15. Energy

  16. (5)

    ohm

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