Q. Write two differences between emf and potential difference (pd).

Q. What are radioisotopes? Write any one use of radioisotopes.

Q. (a) Obtain the expression for the torque on a loop placed in a uniform magnetic field.

Q. Define intensity of electric field (E) and the potential differences (V) between two points. Derive the relation between them.

Q. What is rectification? Explain the working of a full-wave rectifier with a diagram. What is a zener diode? How will a zener diode be connected in a circuit generally?

Q. State Moseley's law. What is its importance?

Q. Write any two applications of interference.

Q. Modulation is necessary for :

1. Reducing height of antenna
2. All of these
3. Reducing noise in signal
4. Multiplexing of signal

Q. The resistance of a moving coil galvanometer is 15 Ohms. The maximum current it can measure is 0.015A. How would you convert it into:
(i) An ammeter to measure 1.5 A?
(ii) A voltmeter to measure 1.5 V?

Q. Distinguish between nuclear fusion and nuclear fission.

Q. The maximum torque acting on a magnet in a field of induction 0.2 tesla is 10 N-m. What is the magnetic moment?

Q. What is the Doppler effect? Find an expression for the apparent frequency heard when the source is in motion and the listener is at rest. The third overtone produced by a vibrating string 2m long is 1200 Hz. What is the velocity of propagation of the wave?

Q. How many electrons flow through a wire, when 1A current passes for a millisecond?

Q. Describe the construction and working of an optical fiber. State its uses.

Q. What are Fraunhofer lines? What is their impotance?

Q. Define the photoelectric effect. Write the laws of the photoelectric effect.

Q. Derive the balancing condition of a Wheatstone bridge.

Q. What is the role of a moderator in a nuclear reactor?

Q. Three capacitors of capacitances $4\mu F,6\mu F$ and $8\mu F$ are connected in parallel.
(i) What is the ratio of charges?
(ii) What is the ratio of potential differnces?

Q. What are Peltier and Thomson effects? Define their coefficients.

Q. Derive an expression for magnetic field at a point on the axial line of a bar magnet.