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12th Standard English Medium Physics Subject Current Electricity Book Back 1 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. Two wires of A and B with circular cross section made up of the same material with equal lengths. Suppose RA = 3 RB, then what is the ratio of radius of wire A to that of B?

    (a)

    3

    (b)

    \(\sqrt3\)

    (c)

    \(\frac{1}{\sqrt3}\)

    (d)

    \(\frac{1}{3}\)

  2. 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)

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

  3. There is a current of 1.0 A in the circuit shown below. What is the resistance of P ?

    (a)

    1.5 Ω

    (b)

    2.5 Ω

    (c)

    3.5 Ω

    (d)

    4.5 Ω

  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

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