1. Proton
2. Electron
3. Deuteron
4. α-particle

# The particle that travels with a speed greater than that of light is:

1. Lepton
2. Pion
3. Meson
4. None of these

1. τ = λ
2. τ = 1/λ
3. τ = λ/ln(2)
4. τ = ln(2)/λ

1. c
2. 2c
3. c/2
4. 0.9c

# The expression Ax + By + C = 0 where A, B and C  are constant is the equation of a straight line known as:

1. Point-slope form
2. Standard form
3. Slope-intercept form
4. Two-point form

# Which of the following properties of an electron is made use of in the electron microscope?

1. High velocity
2. Wave nature
3. Interference
4. Diffraction

1. 0, 1, 2, 3
2. 0, 1, 2
3. 1, 2, 3
4. -1, 0, +1

# What is the location of the first maxima for 6000 Å light beam?

1. incident on two slits 0.15 mm apart with the screen at 1.5 m is:
1. 3 mm
2. 6 mm
3. 12 mm
4. 24 mm

# In the photoelectric effect, the stopping potential is:

1. directly proportional to the photoelectric current
2. proportional to the square of the frequency of incident photons
3. determined completely by the properties of the square of metal on which light shines
4. None of the above

# In hydrogen atom on decreasing the principal quantum number n the value of radius (r) and frequency (f) will:

1. decrease
2. increase
3. radius increase and frequency decrease
4. frequency increase and radius decrease

1. 2n + l
2. 2n + 2l
3. 2(2l + 1)
4. 2l + 1

# Which part of a transistor is doped the heaviest to supply charge carries?

1. Emitter
2. Base
3. Collector
4. None of these