Selected MCQ

Current Question
Which law predicts the effect of concentration on equilibrium position?
  • A. Hess’s law
  • B. Le Châtelier’s principle
  • C. Boyle’s law
  • D. Faraday’s law
Correct Answer: B
Explanation:
Equilibrium shifts to oppose an imposed concentration change.
Related Question 1
The Dirac equation predicts existence of:
  • A. Neutrons
  • B. Positrons
  • C. Photons
  • D. Quarks
Correct Answer: B
Explanation:
Dirac’s relativistic equation led to prediction of antimatter.
Related Question 2
The uncertainty in position and momentum obeys:
  • A. Exact equality always
  • B. Inequality relation
  • C. Zero uncertainty
  • D. Independent variables
Correct Answer: B
Explanation:
Position and momentum uncertainties are fundamentally constrained.
Related Question 3
Which gas contributes most to greenhouse effect after water vapor?
  • A. Methane
  • B. CO₂
  • C. Ozone
  • D. Nitrogen
Correct Answer: B
Explanation:
CO₂ is major anthropogenic greenhouse gas.
Related Question 4
The Doppler effect for light leads to redshift when:
  • A. Source approaches observer
  • B. Source moves away
  • C. Observer moves toward source
  • D. Wavelength decreases
Correct Answer: B
Explanation:
Receding source increases wavelength (redshift).
Related Question 5
Which factor does NOT affect equilibrium constant?
  • A. Temperature
  • B. Pressure
  • C. Catalyst
  • D. Concentration
Correct Answer: C
Explanation:
Catalyst affects rate but not equilibrium position.