Selected MCQ

Current Question
Which radiation has shortest wavelength?
  • A. Radio
  • B. Microwave
  • C. X-ray
  • D. Gamma ray
Correct Answer: D
Explanation:
Gamma rays have highest frequency and shortest wavelength.
Related Question 1
For blackbody radiation, Wien’s displacement law relates peak wavelength inversely to:
  • A. Pressure
  • B. Temperature
  • C. Entropy
  • D. Emissivity
Correct Answer: B
Explanation:
The hotter the blackbody, the shorter the wavelength at which it emits most strongly.
Related Question 2
Which interaction has shortest range?
  • A. Gravitational
  • B. Electromagnetic
  • C. Weak
  • D. Strong
Correct Answer: C
Explanation:
Weak force acts over very short distances.
Related Question 3
Which law governs blackbody radiation spectrum?
  • A. Newton’s law
  • B. Planck’s law
  • C. Boyle’s law
  • D. Hooke’s law
Correct Answer: B
Explanation:
Planck’s law describes spectral energy distribution.
Related Question 4
The Compton wavelength is inversely proportional to:
  • A. Charge
  • B. Mass
  • C. Velocity
  • D. Frequency
Correct Answer: B
Explanation:
(\lambda = h/mc), inversely dependent on mass.
Related Question 5
The de Broglie wavelength of a particle decreases when its:
  • A. Charge increases
  • B. Momentum increases
  • C. Mass decreases at fixed momentum
  • D. Spin changes
Correct Answer: B
Explanation:
(\lambda = h/p), so wavelength is inversely proportional to momentum.