Selected MCQ

Current Question
El Niño conditions are typically associated with:
  • A. Stronger-than-normal upwelling off western South America
  • B. Weakened trade winds and warmer eastern Pacific surface waters
  • C. Permanent expansion of sea ice
  • D. A stronger Walker circulation
Correct Answer: B
Explanation:
El Niño weakens normal equatorial Pacific circulation and suppresses eastern Pacific upwelling.
Related Question 1
The cosmological constant is associated with:
  • A. Gravity weakening
  • B. Dark energy
  • C. Dark matter
  • D. Nuclear force
Correct Answer: B
Explanation:
Cosmological constant models accelerated expansion.
Related Question 2
Metamorphic foliation typically develops due to:
  • A. Rapid cooling of lava
  • B. Directed pressure causing mineral alignment
  • C. Cementation of sediments
  • D. Weathering in arid climates
Correct Answer: B
Explanation:
Differential stress aligns platy or elongate minerals into planar fabrics.
Related Question 3
Which boundary is most associated with deep ocean trenches?
  • A. Divergent continental rifts
  • B. Convergent subduction zones
  • C. Passive margins
  • D. Transform faults
Correct Answer: B
Explanation:
Trenches form where one lithospheric plate bends and subducts beneath another.
Related Question 4
Which reagent most directly distinguishes aldehydes from ketones under mild conditions?
  • A. Bromine water
  • B. Tollens’ reagent
  • C. Dilute HCl
  • D. Sodium chloride
Correct Answer: B
Explanation:
Aldehydes reduce Tollens’ reagent whereas ordinary ketones generally do not.