Q. Define Magnetisation of a sample. What is its SI unit?

Q. State the working principle of potentiometer. Explain with the help of circuit diagram how the emf of two primary cells are compared by using the potentiometer.

Q. Derive the expression for the intensity at a point where interference of light occurs. Arrive at the conditions for maximum and zero intensity.

Q. Magnetic lines form continuous closed loops. Why?

Q. What is Hypermetropia? How can it be corrected?

Q. Derive an expression for the capacitance of a parallel plate capacitor.

Q. What is the phenomenon involved in the working of a transformer?

Q. Define Modulation. Mention the basic methods of modulation.

Q. A rocket is moving at a speed of $200{ms}^{-1}$ towards a stationary target. While moving, it emits a wave of frequency $1000Hz$. Calculate the frequency of the sound as detected by the target. (Velocity of sound in air is $330{ms}^{-1}$)

Q. State the basic postulates of Bohr's theory of atomic spectra.

Q. Describe the ways in which Eddy currents are used to advantage.

Q. A potentiometer wire is $5m$ long and a potential difference of $6V$ is maintained between its ends. Find the emf of a cell which balances against a length of $180cm$ of the potentiometer wire.

Q. Give two uses of Infrared Rays.

Q. In which bias can a zener diode be used as voltage regulator?

Q. Define intensity of electric field at a point. Derive an expression for the electric field intensity due to a point charge.

Q. The work function of cesium is $2.14eV$. Find the threshold frequency for cesium. (Take $h=6.6\times {10}^{-34}Js$)

Q. What is Doppler effect? Obtain an expression for the apparent frequency of sound heard when the source is in motion with respect to an observer at rest.

Q. Derive an expression for the magnetic dipole moment of a revolving electron.

Q. Write down de Broglie's relation and explain the terms therein.