Selected MCQ

Current Question
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.
Related Question 1
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 2
Which particle experiences all four fundamental forces?
  • A. Electron
  • B. Proton
  • C. Neutrino
  • D. Photon
Correct Answer: B
Explanation:
Proton interacts via strong, weak, EM, and gravity.
Related Question 3
Which particle is neutral?
  • A. Proton
  • B. Electron
  • C. Neutron
  • D. Positron
Correct Answer: C
Explanation:
Neutron has no charge.
Related Question 4
Which principle states particles are indistinguishable?
  • A. Pauli principle
  • B. Superposition principle
  • C. Indistinguishability principle
  • D. Correspondence principle
Correct Answer: C
Explanation:
Quantum particles of same type are identical.
Related Question 5
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.