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12th Standard Physics Chapter 2 Current Electricity Book Back Questions

Current Electricity Book Back Questions

12th Standard

    Reg.No. :
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Physics

Time : 00:45:00 Hrs
Total Marks : 30
    5 x 1 = 5

  1. A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.

    (a)

    400 W

    (b)

    2 W

    (c)

    480 W

    (d)

    240 W

  2. What is the value of resistance of the following resistor?

    (a)

    100 k Ω

    (b)

    10 k Ω

    (c)

    1 k Ω

    (d)

    1000 k Ω

  3. In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in USA will be ______.

    (a)

    R

    (b)

    2R

    (c)

    \(\frac{R}{4}\)

    (d)

    \(\frac{R}{2}\)

  4. The temperature coefficient of resistance of a wire is 0.00125 per °C. At 20°C, its resistance is 1 Ω. The resistance of the wire will be 2 Ω at ______.

    (a)

    800 °C

    (b)

    700 °C

    (c)

    850 °C

    (d)

    820 °C

  5. A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ______.

    (a)

    each of them increases

    (b)

    each of them decreases

    (c)

    copper increases and germanium decreases

    (d)

    copper decreases and germanium increases

    6. 3 x 2 = 6

  6. Distinguish between drift velocity and mobility.

  7. What is Seebeck effect?

  8. What is Peltier effect?

    9. 3 x 3 = 9

  9. Compute the current in the wire if a charge of 120 C is flowing through a copper wire in 1 minute.

  10. Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across each resistors in the circuit.

  11. Two resistors when connected in series and parallel, their equivalent resistances are 15 Ω and \(\frac{56}{15}\)Ω respectively. Find the individual resistances.

    12. 2 x 5 = 10

  12. Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will get fused?

  13. For the given circuit find the value of I.

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