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Which of the following statements are true about the variability of rainfall in India?

  1. Variability is calculated using the formula: (Standard deviation / Mean) x 100.

  2. Higher variability indicates more consistent rainfall patterns.

  3. Variability contributes to the occurrence of droughts and floods.

  4. The annual average rainfall of India is 250 cm.

A1 & 3

B2 & 4

C1 & 4

D2 & 3

Answer:

A. 1 & 3

Read Explanation:

  • Variability is calculated using the formula: (Standard deviation / Mean) x 100. This is the correct statistical formula for the coefficient of variation, which is used to measure rainfall variability as a percentage.

  • Higher variability actually indicates less consistent rainfall patterns, not more consistent ones. Higher variability means there are greater deviations from the mean rainfall, showing unpredictable or irregular patterns. Consistent rainfall would have low variability.

  • Variability contributes to the occurrence of droughts and floods. When rainfall patterns are highly variable, some regions may experience excessive precipitation (causing floods) while others face deficient rainfall (causing droughts) during the same period.

  • The annual average rainfall of India is approximately 118 cm (or about 1,170 mm), not 250 cm. The figure of 250 cm is an overestimation of the actual average rainfall received in India


Related Questions:

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Reason (R): Tamil Nadu is located in the rain shadow region of the Arabian Sea branch.

The high pressure over northern plains during winter is best explained by which of the following factors?

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  1. Köppen's classification is universally accepted in India for agricultural planning.

  2. The system does not account for microclimates and local variations.

  3. It is primarily temperature-centric with secondary rainfall consideration.

Which of the following statements are correct regarding the formation of the Southwest Monsoon?

  1. The monsoon is a result of the trade winds from the Northern Hemisphere.

  2. The trade winds cross the equator and originate from the Indian Ocean.

  3. The thermal low-pressure over northwest India intensifies in May.

  4. The southwest monsoon is directly responsible for heavy rain on the leeward side of the Western Ghats.

Which of the following statements are correct regarding the temperature and timing of the monsoon?

  1. The monsoon typically bursts in Kerala in the first week of July.

  2. The interior parts of India may experience monsoon delays until the first week of July.

  3. There is a noticeable decline in day temperatures in the mid-June to mid-July period.

  4. The western ghats experience a temperature increase during the monsoon season.