Selected MCQ

Current Question
A confined aquifer differs from an unconfined aquifer because it is:
  • A. Unsaturated
  • B. Bounded above by a low-permeability layer
  • C. Composed only of limestone
  • D. Always shallower
Correct Answer: B
Explanation:
A confining layer restricts flow and can produce artesian pressure.
Related Question 1
The wavefunction of a particle must be continuous because:
  • A. It represents force
  • B. Its square gives probability density
  • C. It represents velocity
  • D. It defines temperature
Correct Answer: B
Explanation:
Discontinuity would imply undefined probability.
Related Question 2
The speed of light in vacuum is invariant because:
  • A. It depends on observer motion
  • B. It is defined constant in relativity
  • C. It varies with energy
  • D. It depends on medium
Correct Answer: B
Explanation:
Special relativity postulates constant light speed in all inertial frames.
Related Question 3
The Coriolis effect arises because Earth:
  • A. Is spherical
  • B. Rotates
  • C. Has an atmosphere
  • D. Has oceans
Correct Answer: B
Explanation:
Rotation causes apparent deflection of moving air and water in a rotating frame.
Related Question 4
The mineral calcite reacts vigorously with dilute hydrochloric acid because it is a:
  • A. Silicate
  • B. Sulfide
  • C. Carbonate
  • D. Oxide
Correct Answer: C
Explanation:
Carbonates effervesce by releasing (CO_2) upon acid reaction.
Related Question 5
Action potentials in neurons propagate because of sequential opening of:
  • A. Ligand-gated chloride channels only
  • B. Voltage-gated sodium and potassium channels
  • C. Aquaporins
  • D. Calcium pumps only
Correct Answer: B
Explanation:
Depolarization and repolarization are driven mainly by voltage-gated Na(^+) and K(^+) channels.