List of practice Questions

Explain the working of P-N junction diode. Draw the circuit of full wave rectifier and explain its working.
For a thin lens find the formula \(\frac{1}{f} = (\mu - 1) \left(\frac{1}{R_1} - \frac{1}{R_2}\right)\), where the meaning of symbols is general.
Define magnetic moment. Write its S.I. unit and dimension.
A sphere of radius 5 cm has a charge of 31.41 \(\mu\)C. Calculate the surface density of charge.
Write down two necessary conditions for interference of light.
What will be the path followed by a charged particle moving along a magnetic field.
Define modulation. Write its types.
The horizontal component of earth's magnetic field at any place is \(\sqrt{3}\) times its vertical component. What will be the value of angle of dip at that place?
What is current density? Discuss.
On what two factors does the capacity of a condenser depend?
What do you understand by capacity of any conductor? Find an expression for the capacity of a cylindrical condenser.
Lenz's law follows the law of conservation of energy. Explain.
What is photo-cell? Write down its two applications.
The decay constant of a radioactive substance is 5.2 x 10\(^3\) per year. What is its half-life?
What is Curie law?
What are '\(\alpha\)' and '\(\beta\)' parameters of transistor? What is their relation?
Differentiate between primary and secondary rainbows.
Under what condition will the magnifying power of a microscope be maximum?
What is carbon dating?
A convex lens of refractive index 1.5 is kept in a liquid medium having same refractive index. What is the focal length of the lens in this medium?
Write down truth table and Boolean expression for NOR and NAND gates.
For resonance condition in any L-C-R circuit, the phase-difference between applied voltage and current is
In step-up transformer, the value of current in secondary coil compared to primary coil is
X-rays are
The critical angle for total internal reflection of a ray from any medium to vacuum is 30\(^{\circ}\). Then velocity of light in the medium will be