Q. Derive an expression:
$\frac{\mu }{v}-\frac{1}{u}=\frac{\mu -1}{R}$
for refraction of light at spherical surface.

Q. Explain simple microscope on the basis of the following points:
(a) Ray diagram for the formation of image;
(b) Expression for magnifying power when the final image is formed:
(i) At the least distance of distinct vision;
(ii) At infinity.

Q. Give in detail about electron, proton and neutron on the following points:
(a) Chemical symbol
(b) Charge
(c) Name of Discoverer.

Q. Ohmic resistance is

1. Copper wire
2. Photo-emissive diode
3. Junction diode
4. Transistor

Q. Explain Huygen's principle of secondary wavelets.

Q. S.I. unit of electrical capacity.

1. Stat Farad
2. Farad
3. Stat Coulomb
4. Coulomb

Q. Which of the following can be sent from one place to another by a Fax machine?

1. Sound
2. Picture and Sound
3. A copy of document
4. Picture

Q. Describe labelled diagram of Terrestrial telescope and derive expression for its magnifying power.

Q. The meaning of www is _______.

Q. Match the right pairs:

Q. The waves used in telecommunication are

1. Cosmic rays
2. Infrared
3. Microwaves
4. Ultraviolet

Q. Draw labelled diagrams and derive expressions for the resultant capacity when capacitors are connected in:
(a) Series Combination
(b) Parallel Combination.

Q. The S.I. unit of magnetic moment is ________.

Q. For the terrestrial magnetism establish a relation between angle of dip $\theta$, horizontal component $H$ and vertical component $V$.

Q. The fall in potential per unit length of potentiometer wire is called ________.

Q. Determine De-Broglie Wave equation.

Q. Derive an expression for the intensity of magnetic field on broad side on position due to a bar magnet.

Q. A transparent medium of the angle of polarisation is ${60}^o$. Find the angle of refraction.

Q. If the incidence is at polarising angle, the angle between Reflected ray and the Refracted ray from a surface is _________.

Q. Explain the construction and working of Van-de-Graff generator. State its uses.

Q. ________ is a device which is used to increase electrical capacity without increasing its size.

Q. The relationship between current gain $\alpha$ in Common Base [CB] mode and current gain $\beta$ in Common Emitter [CE] mode is

1. $\beta =\alpha +1$
2. $\beta =\frac{\alpha }{1-\alpha }$
3. $\beta =1-\alpha$
4. $\beta =\frac{\alpha }{1+\alpha }$

Q. Describe LASER under the following points:
(a) Meaning
(b) Basic Principle
(c) Uses.

Q. Write four points of difference between e.m.f. (Electromotive Force) and Potential difference.

Q. What is an oscillator? Explain use of transistor as an oscillator under the following points:
(i) Labelled Circuit diagram,
(ii) Working.

Q. Establish the relation amongst $u$, $v$ and $f$ for concave lens.

Q. Prove for an a.c. circuit:
$P_{av}=V_{rms}\times I_{rms}\times \cos \varphi$

Q. Write notes on the following:
(a) Fax
(b) Optical detector
(c) Diode Laser
(d) Difference between amplitude modulation and frequency modulation.

Q. What is $Q$-factor? Write its expression and write the conditions for its maximum value.

Q. State and explain Kirchhoff's Laws in the current electricity.