UPSC preliminary MCQ'S 2019 Part 08

Consider the following statements:

1. Brahmaputra has the largest river basin in India.

2. The Kaveri river rises in the Brahmagri range of the Western Ghats.

3. Sambhar lake in Rajasthan, is a salt water lake.

Which of the statements given above is/are correct?

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a) 1, 2 and 3

b) 1 and 3 Only

c) 2 and 3 Only

d) 1, 2 Only

Correct Answer: C

Explanation

Statement 1 is INCORRECT. River Ganges has the largest river basin in India.

Source: NCERT Geography, Class 9, Unit 3, Drainage

Which of the following should result in more rainfall around summers in India:

1. Heating of Tibetan plateau.

2. Presence of the low-pressure area, east of Madagascar.

Use the code given below to select the correct answer:

a) 1 Only

b) 2 Only

c) Both 1 and 2

d) Neither 1 nor 2

Correct Answer: A

Explanation

Statement 2 is INCORRECT. The presence of the high-pressure area (NOT low), east of Madagascar, approximately at 20°S over the Indian Ocean affects the Indian Monsoon. The intensity and position of this high-pressure area results in higher rainfall. The Tibetan plateau gets intensely heated during summer, which results in strong vertical air currents and the formation of low pressure over the plateau at about 9 km above sea level. This intensifies the

monsoon, hence more rainfall

.

A term related to rainfall in India, ‘Mahawat', is a specific kind of rainfall. Which of the

following is/are correct regarding it:

1. It is caused by a low-pressure systems, originating over the Mediterranean Sea and western Asia and move into India, along with the westerly flow.

2. They cause the much-needed winter rains over Southern Indian coasts.

3. They are of immense importance for the cultivation of ‘rabi’ crops.

Use the code given below to select the correct option:

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a) 1 and 2 Only

b) 2 and 3 Only

c) 1 and 3 Only

d) 1, 2 and 3

Correct Answer: C

Explanation

Statement 2 is INCORRECT. ‘Mahawat' causes much-needed winter rains over the plains and snowfall in the mountains.

Source: NCERT Geography, Class 9, Unit 4, Climate