1.

For a medium with permittivity (e) and permeability (µ), the speed of light (v) is given by:

• \(v=\sqrt{\frac{\mu}{\isin}}\)
• \(v=\sqrt{\mu\isin}\)
• \(v=\frac{1}{\sqrt{\mu\isin}}\)
• \(v=\sqrt{\frac{∈}{μ}}\)

2.

Which of the following statements are correct?
(A) The resistivity of a semiconductor decreases with increasing temperature.
(B) The potentiometer is unaffected by the internal resistance of the source.
(C) In ionic crystals and electrolytic liquids electrons carry the electric current.
(D) Ohm's law fails if V depends on I non-linearly.
(E) Kirchhoff's rules are used for analysis of electric circuits.
Choose the correct answer from the options given below:

• (B), (C) and (E) only
• (A), (B), (D) and (E) only
• (C), (D) and (E) only
• (A), (C) and (D) only

3.

The logic gate realised using p-n junction diodes in the given figure is:

• OR gate
• NOT gate
• AND gate
• NAND gate

4.

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5.

Energy band gap is maximum in:

• metals
• semi-conductor
• super conductor
• insulator

6.

The forbidden energy gaps in conductors, semiconductors and insulators are (E_g)_c, (E_g)_s and (E_g)₁ respectively. What is the relation among them ?

• (E_g)_c < (E_g)_s < (E_g)_t
• (E_g)_c > (E_g)_s > (E_g)_t
• (E_g)_c < (E_g)_s > (E_g)_t
• (E_g)_c = (E_g)_s > (E_g)_t