Which of the following statements is NOT correct?

Question

UnlockIAS · Accepted Answer

Correct — C. 'El Nino occurs every year' is the NOT-correct statement — El Nino is an irregular, quasi-periodic event, recurring on average every 2 to 7 years as part of the El Nino-Southern Oscillation (ENSO) cycle, not annually. The other three statements are accurate: El Nino is marked by anomalous warming of surface waters off the Peru coast (statement a), it typically weakens/suppresses the Indian south-west monsoon (statement b), and La Nina — the cold-phase counterpart — typically strengthens the Indian monsoon (statement d).

Why the other options are wrong — (a) This statement IS correct (El Nino is the anomalous warm-water event off the Peru coast), so it is not the answer to a 'NOT correct' question.  (b) This statement IS correct — El Nino years are typically associated with below-normal south-west monsoon rainfall in India — so it is not the answer.  (d) This statement IS correct — La Nina years are typically associated with above-normal south-west monsoon rainfall in India — so it is not the answer.

Concept: El Nino and La Nina are the warm and cold phases of ENSO (El Nino-Southern Oscillation), an irregular ocean-atmosphere cycle in the tropical Pacific. El Nino recurs roughly every 2-7 years, not annually, and typically weakens the Indian south-west monsoon by disrupting the Walker Circulation; La Nina has broadly the opposite effect.

State PCS 2024 Q75 — Geography PYQ with Answer

State PCS 2024 Q75 — Geography PYQ with Answer