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Western Disturbances: Why North India Gets Winter Rain — MCQs with Answers

Test what you know about Western Disturbances: Why North India Gets Winter Rain with 10 UPSC Prelims-style questions. Try each one first, then tap “Show answer” for the correct option and its explanation.

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  1. Q1. Which description identifies a western disturbance?

    1. The annual reversal of southwest monsoon winds itself
    2. Every cyclone developing over a warm tropical ocean
    3. An extra-tropical weather system embedded in the mid-latitude westerlies
    4. A stationary local breeze with no evolving circulation
    Show answer

    Correct answer: (C) An extra-tropical weather system embedded in the mid-latitude westerlies

    Explanation

    Correct Answer: (C). A western disturbance is an extra-tropical system carried within the westerlies. The monsoon is a seasonal circulation, while tropical cyclones develop in a different setting and structure. A stationary local breeze also lacks the moving perturbation described. Rainfall alone cannot identify the system without its circulation and regional context.

  2. Q2. What does western primarily signify in the term western disturbance?

    1. Its approach from the west and general eastward movement
    2. That rainfall is confined exclusively to western India
    3. That it always moves east to west
    4. That it originates in the Arabian Sea in every case
    Show answer

    Correct answer: (A) Its approach from the west and general eastward movement

    Explanation

    Correct Answer: (A). Western describes the approach from the west, with general west-to-east movement across West and South Asia. It does not restrict effects to western India or reverse the travel direction. Nor does it establish one universal Arabian Sea birthplace. Systems vary in development, track and the regions receiving precipitation.

  3. Q3. Which current helps steer many western disturbances towards India in winter?

    1. A permanent equatorial surface calm
    2. Only local daytime sea breezes
    3. The seasonal rain shadow of the Deccan
    4. Subtropical westerly jet stream
    Show answer

    Correct answer: (D) Subtropical westerly jet stream

    Explanation

    Correct Answer: (D). The subtropical westerly jet is an important winter steering current for many disturbances. A surface calm does not provide that transport. Local sea breezes are not this large-scale upper-air current, and a rain shadow is a rainfall pattern rather than a steering flow. The jet assists movement but is not itself the disturbance.

  4. Q4. Consider these statements about source regions: 1. Every western disturbance has exactly the same fixed birthplace in one sea. 2. Descriptions include the Mediterranean, Caspian region and wider West Asian corridor. Which is correct?

    1. 1 only
    2. 2 only
    3. Both 1 and 2
    4. Neither 1 nor 2
    Show answer

    Correct answer: (B) 2 only

    Explanation

    Correct Answer: (B). Statement 2 reflects the broader geographical account in the article. Statement 1 overstates a textbook shorthand by assigning every event one fixed origin. Accepting both retains that false universal claim. Rejecting both discards the legitimate regional description. Individual disturbances differ in development and track, so the corridor is more useful than an absolute birthplace.

  5. Q5. Assertion: One disturbance can bring rain to plains and snow to higher elevations. Reason: Temperature, moisture and terrain influence the form of precipitation. Choose the correct relationship.

    1. Both are true, and the reason explains the assertion
    2. Both are true, but the reason does not explain the assertion
    3. The assertion is true, but the reason is false
    4. The assertion is false, but the reason is true
    Show answer

    Correct answer: (A) Both are true, and the reason explains the assertion

    Explanation

    Correct Answer: (A). Both propositions are correct, and the reason explains the contrast. Rising moist air cools and condenses, but temperatures and terrain help determine rain versus snow. The other choices deny either a described outcome or its physical controls. A disturbance therefore need not produce the same precipitation form at every elevation.

  6. Q6. Which conclusion about western disturbances and rabi crops is justified?

    1. Every disturbance necessarily increases every crop yield
    2. Winter precipitation is always harmful to wheat
    3. Suitable winter showers may help wheat and mustard, while hail or untimely rain can damage them
    4. Crop stage has no role in determining effects
    Show answer

    Correct answer: (C) Suitable winter showers may help wheat and mustard, while hail or untimely rain can damage them

    Explanation

    Correct Answer: (C). Moderate rain at a suitable stage can supply moisture to wheat and mustard and reduce irrigation needs. Hail, waterlogging or untimely rain can damage standing crops. The alternatives wrongly guarantee benefit, assume universal harm or ignore growth stage. Agricultural outcomes depend on amount, timing, location and the crop condition.

  7. Q7. Consider these pairs: 1. Western Himalaya — Seasonal snow contribution 2. Northwest plains — Winter rain affecting rabi moisture Which are correctly matched?

    1. 1 only
    2. Both 1 and 2
    3. 2 only
    4. Neither 1 nor 2
    Show answer

    Correct answer: (B) Both 1 and 2

    Explanation

    Correct Answer: (B). Both pairs describe important regional associations. Snowfall contributes to mountain seasonal snow cover, while winter rain can influence moisture for rabi crops in the plains. Rejecting either pair ignores a stated effect. Neither association guarantees water security or crop benefit, because later melt, storage, timing and intensity also shape outcomes.

  8. Q8. Why can a western disturbance interacting with an easterly trough produce widespread heavy precipitation?

    1. The two systems necessarily cancel all uplift
    2. Interaction converts every event into the southwest monsoon
    3. Moisture availability becomes irrelevant whenever two systems meet
    4. The interaction can strengthen ascent and draw on additional moisture
    Show answer

    Correct answer: (D) The interaction can strengthen ascent and draw on additional moisture

    Explanation

    Correct Answer: (D). The article explains that interacting circulations can strengthen ascent and combine moisture contributions, producing heavier or broader precipitation. The alternatives instead assume cancellation, automatically rename the event as monsoon or eliminate moisture from the mechanism. Interaction can enhance an event, but it does not make every disturbance an extreme-weather episode.

  9. Q9. Which statement correctly describes a limitation of forecasting impacts from the label western disturbance alone?

    1. Track, moisture, intensity and relief determine local precipitation and hazards
    2. Every district necessarily receives rain when a disturbance exists
    3. Every disturbance necessarily causes a cold wave
    4. One snowfall directly establishes long-term water security
    Show answer

    Correct answer: (A) Track, moisture, intensity and relief determine local precipitation and hazards

    Explanation

    Correct Answer: (A). Impacts depend on track, available moisture, strength and terrain rather than the label alone. Some locations may receive little precipitation, and temperature responses vary. One snow event cannot establish lasting water security. The incorrect options turn variable local outcomes into universal guarantees that the article explicitly cautions against using.

  10. Q10. On a steep mountain slope, why can the same rainfall total have different consequences at different sites?

    1. Rainfall totals alone determine identical consequences everywhere
    2. Local drainage cannot influence runoff or flooding
    3. Slope, soil moisture, snow, drainage and settlement location modify risk
    4. Settlement location has no connection with exposure
    Show answer

    Correct answer: (C) Slope, soil moisture, snow, drainage and settlement location modify risk

    Explanation

    Correct Answer: (C). The article links mountain impacts to slope, soil moisture, snow conditions, drainage and settlement location. Identical totals can therefore produce different runoff and exposure. The other choices deny those local controls or assume totals alone determine outcomes. Site conditions help explain why district warnings and practical planning matter alongside rainfall measurements.

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