Selected MCQ

Current Question
Which property is quantized in atom?
  • A. Energy
  • B. Velocity
  • C. Force
  • D. Distance only
Correct Answer: A
Explanation:
Atomic energy levels are discrete.
Related Question 1
Which orbital has highest energy in hydrogen atom?
  • A. 2s
  • B. 2p
  • C. 3s
  • D. All same for given n
Correct Answer: D
Explanation:
Energy depends only on n in hydrogen.
Related Question 2
Which part of atom contains protons?
  • A. Orbit
  • B. Shell
  • C. Nucleus
  • D. Cloud
Correct Answer: C
Explanation:
Protons reside in nucleus.
Related Question 3
Which wave property determines pitch?
  • A. Amplitude
  • B. Frequency
  • C. Speed
  • D. Phase
Correct Answer: B
Explanation:
Pitch depends on frequency.
Related Question 4
Which element has smallest atomic radius?
  • A. Li
  • B. Be
  • C. B
  • D. F
Correct Answer: D
Explanation:
Atomic radius decreases across period; fluorine is smallest.
Related Question 5
Which phenomenon leads to quantization of atomic energy levels?
  • A. Classical mechanics
  • B. Boundary conditions on wavefunctions
  • C. Thermal motion
  • D. Friction
Correct Answer: B
Explanation:
Allowed solutions of Schrödinger equation are discrete due to constraints.