CBSE Guess > Papers > Question Papers > Class XII > 2003 > Physics > Compartment Delhi Set -II

PHYSICS—2003 (Set II—Compartment Delhi)

Q. 2. Write the relation between half-life and decay constant of a radioactive sample.

Q. 5. What are the values of (i) the horizontal component of earth's magnetic field and (ii) angle of dip, at the magnetic north pole of the earth?

Q. 6. For recharging, n cells, each of emf E, and internal resistance 'r', are connected in series to a resistor 'R' and a d.c. source of e.m.f. V. Deduce the expressions for (i) charging current in the circuit, and (ii) terminal voltage across the cells, during charging.

Q. 7. Identify the logic gates marked P and Q in the given logic circuit.

Write down the output at X for the inputs (i) A = 0. B = 0 and (ii) A = 1, B = 1.

Q. 11. Define the term 'thermoelectric power of a thermocouple'. Draw the curve to show the variation of thermoelectric power with the variation of the temperature of hot junction of the thermocouple keeping cold junction at 0⁰C.

Q. 15. What is a rectifier? With the help of a labelled circuit diagram, explain the working of a full wave rectifier. Draw the input and output wave forms.
Or, Explain, with the help of a diagram, how (i) depletion layer, and (ii) potential barrier is formed in a p-n junction diode. What happens to the width of depletion layer when the junction is reverse biased?

Q. 16. Draw a circuit diagram which can be used to determine the resistance of a given wire. Explain the principle of the experiment and given the formula used.

Q. 22. Why is nuclear fusion difficult to carry out?
Calculate the energy released in the following nuclear reaction: