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ISC Class 12 Physics Solved Question Paper 2005

Short Answer Type

1. A 900 pF capacitor is charged by a 100V battery. How much energy is stored by the capacitor ?

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2. An AC voltage of 200 V is applied to the primary of a transformer and a voltage of 2000 V is obtained from the secondary. Calculate the ratio of current passing through the primary to that in the secondary coil.

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3. If the temperature of the cold junction of a thermocouple is lowered, what will be the effect on its neutral temperature and temperature of inversion ?

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4. A charge of 5C is placed at the centre of a circle of radius 10 cm as shown in the figure below. Calculate the work done in moving a charge of 2C from point A to B on the circumference of the circle.

Electric potential,

$straight V subscript straight B space minus space straight V subscript straight A space equals space straight W subscript straight A space to space straight B end subscript over straight q 0 space equals straight W subscript straight A space to space straight B end subscript over straight q space$

Potential is the same at each point because it is an equipotential surface.

V_A = V_B
Therefore,W_{A to B} = 0

That is, work done in moving a charge of 2C from point A to B.

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5. A 2V battery with internal resistance of 0.1 Ω is charged with a current of 5A. Calculate the potential difference between the terminals of the battery.

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6. A rectangular coil of area 50 cm² and 100 turns is placed perpendicular to a magnetic field of 10^-2 Wb/m². If the coil is withdrawn from the field in 40 milliseconds, calculate the emf induced.

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7. The electric main in a house is marked 220 V - 50 Hz. Write down the equation for the instantaneous voltage. The only variable in this equation should be ‘t’

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