1.

What is the wavelength of light for the least energetic photon emitted in the Lyman series of the hydrogen atom spectrum lines?
(Take h=6.63×10^-34Js; c=3×10⁸ ms^-1; e=1.6×10^-19C)

• 122nm
• 12.2nm
• 1.22nm
• 10.2nm

2.

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

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

3.

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

4.

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

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

5.

A parallel beam of monochromatic light of wavelength 460 nm passes through a long slit of width 0.1 mm. What is the angular divergence in which most of the light is diffracted?

• 2.3×10^-3 rad
• 4.6×10^-3 rad
• 9.2×10^-3 rad
• 9.2×10^-6 rad

6.

We are the organizers. We __ welcome the guests.