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Current Electricity

12th Physics - Current Electricity Model Question Paper

Current Electricity Model Question Paper

12th Standard

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Physics

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. The following graph shows current versus voltage values of some unknown conductor. What is the resistance of this conductor?

    (a)

    2 ohm

    (b)

    4 ohm

    (c)

    8 ohm

    (d)

    1 ohm

  2. A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case power dissipation is P2. The ratio \(\frac{P_2}{P_1}\) is ______.

    (a)

    1

    (b)

    2

    (c)

    3

    (d)

    4

  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. The emf of a battery is 3 volts and internal resistance 0.125 \(\Omega \) . The difference of potential at the terminal of battery when connected across an external resistance of 1 \(\Omega \) is ______________.

    (a)

    1.67 V

    (b)

    0.67 V

    (c)

    2.67 V

    (d)

    3.67 V

    6. 5 x 2 = 10

  6. Write down the various forms of expression for power in electrical circuit.

  7. State Kirchhoff ’s current rule.

  8. What do you mean by a series combination of cells?

  9. What do you mean by end resistance? How can it be rectified?

  10. How does the conductivity of a semiconductor change with rise in temperature? Explain.

    11. 5 x 3 = 15

  11. 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.

  12. If the resistance of coil is 3 Ω at 20oC and α = 0.004/oC then determine its resistance at 100oC.

  13. Find the expression for the equivalent emf & internal resistance of the series combination of cells.

  14. State Joule's law.

  15. Explain Peltier effect.

    16. 4 x 5 = 20

  16. 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?

  17. A battery has an emf of 12 V and connected to a resistor of 3 Ω. The current in the circuit is 3.93 A. Calculate
    (a) terminal voltage and the internal resistance of the battery
    (b) power delivered by the battery and power delivered to the resistor

  18. A conductor of length I is connected to d.c. source of potential V. If the length of the conductor is doubled by treating it, keeping V constant, explain how do the following factors vary in the conductor
    (i) Drift velocity.
    (ii) Resistor
    (iii) Resistivity.

  19. Write mathematical relation between
    (i) mobility & drift velocity of charge carriers in a conductor
    (ii) mobility & relaxation time (or) mean free time.

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