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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 ?

C = 900 PF = 900 x 10^-12 F

V = 100V

Energy stored in the capacitor is given by,

$straight E space equals space 1 half space CV squared space space space equals space 1 half straight x space 900 space straight x space 10 to the power of negative 12 end exponent space straight x space left parenthesis 100 right parenthesis squared space space space equals space space 1 half straight x space 9 space straight x space 10 to the power of negative 10 end exponent space straight x space 10 to the power of 4 space space space equals space 4.5 space straight x space 10 to the power of negative 6 end exponent space straight J$

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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.

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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 If the coil is withdrawn from the field in 40 milliseconds, calculate the emf induced.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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