Q. How is the de-Broglie wavelength associated with an electron accelerated through a potential difference of $100$ volts?

Q. A light bulb is rated at $100W$ for a $220V$ supply. Find the resistance of the bulb.

Q. Explain polarisation of light by reflection and arrive at Brewster's law from it.

Q. A current of $10A$ passes through two very long wires held parallel to each other and separated by a distance of $2m$. What is the force per unit length between them?

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

Q. Explain the formation of a Rainbow.

Q. Write the different types of Hydrogen Spectral series. The Lyman series of Hydrogen spectrum lies in the ultraviolet region. Why?

Q. What are Intrinsic and Extrinsic semi-conductors?

Q. How are Microwaves produced?

Q. Define Magnetic susceptibility. Mention its unit.

Q. Explain the principle and working of Nuclear Reactor with the help of a labelled diagram.

Q. Write down Einstein's photoelectric equation.

Q. How are Stationary waves formed in closed pipes and open pipes? Explain the various modes of vibrations and obtain relations for their frequencies.

Q. Draw a neat (labelled) diagram for the formation of image in a simple microscope.

Q. Explain series combination of Capacitors. Derive the formula for equivalent capacitance.

Q. Distinguish between Ammeter and Voltmeter.

Q. State the working principle of Potentiometer. Explain with the help of circuit diagram, how the potentiometer is used to determine the internal resistance of the given Primary cell.
In a potentiometer arrangement, a cell of emf $1.25V$ gives a balance point at $35.0cm$ length of the wire. If the cell is replaced by another cell and the balance point shifts to $63.0cm$, what is the emf of the second cell?

Q. Derive an expression for the electric field at a point on the equatorial plane of an electric dipole.

Q. Which type of communication is employed in mobile phones?