Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

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 ?

1321 Views

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.

181 Views

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 ?

251 Views

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.

300 Views

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.

187 Views

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 If the coil is withdrawn from the field in 40 milliseconds, calculate the emf induced.

Area of cross- section, A = 50 cm² = 50 x 10^-4 m²

No. of turns, N = 100 turns

Magnetic field, B = 10^-2 Wb/m²

time, t = 40 milli seconds = 40 x 10^-3 seconds.

Flux, Φ₁ = BA = 10^-2 = 50 x 10^-4 = 5 x 10^-5 Wb.

Φ= 0

$straight e space equals space minus fraction numerator negative open parentheses straight ϕ subscript 2 space minus space straight ϕ subscript 1 close parentheses over denominator straight t end fraction space space equals space fraction numerator negative left parenthesis space 0 space minus space 5 space straight x space 10 to the power of negative 5 end exponent right parenthesis over denominator 40 space straight x space 10 to the power of negative 3 end exponent end fraction space space equals space 5 over 4 space straight x space 10 to the power of negative 3 end exponent$

e = 1.25 x 10^-3 volt

566 Views

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’

414 Views