Monsoon - GS questions based on daily current affairs

1)   The project SWAAMI is related to

a. Aerosol interaction with rainfall
b. Spiritual development of youth in India
c. Development of Yoga in Indian universities
d. None of the above
Answer  Explanation 

ANSWER: Aerosol interaction with rainfall


  • The project “South West Asian Aerosol - Monsoon Interactions (SWAAMI)”, involves measurements of aerosols across northern India and the Bay of Bengal during the pre-monsoon which will then be synthesized with long term measurements from ground based networks and data from previous intensive campaigns.
  • The study is expected to characterize the mechanisms by which aerosols influence the Indian monsoon.
  • This joint effort is part of the implementation agreement signed between MoES and Natural Environment Research Council (NERC), UK on “Predicting the Variability of the South Asian Monsoon” under the existing MoU between MoES and UK on Collaboration in Earth System Science. Three research projects involving the Indian and UK scientists will study different aspects of physical processes affecting the monsoon.

2)   Which of the following is/are true about Monsoon?

a. Monsoon comes gradually
b. Monsoon bursts suddenly
c. Tropical Easterly Jet flow in upper troposphere.
d. None of the above
Answer  Explanation 

ANSWER: Monsoon bursts suddenly


  • Southwest monsoon hits the Kerala coast every year precisely on June 1. Monsoon does not come gradually; it “bursts” suddenly on a single day.
  • Sub-Tropical Jet stream (STJ) is a narrow band of fast moving air flowing from west to east [Westerlies]. This jet stream is bifurcated by the Himalayan ranges and Tibetan Plateau.
  • A warm-core anticyclone is formed over this plateau during the summer monsoon period. It is the result of a process called anticyclogenesis.
  • At the beginning of June, the STJ disappears from the southern side of the plateau. In other words, the jet disappears completely over northern India accentuated by the anticyclogenesis created by the Tibetan plateau. This sudden shift is the cause of the “bursting” of the monsoon.
  • Easterly winds blow in the mid-troposphere and are known as the Tropical Easterly Jet. This jet extends far to the south of Tibet and the air flow is roughly along the Calcutta-Bangalore axis.

3)   What is formed over Tibet plateau during the summer monsoon period?

a. Cyclone
b. Tornadoes
c. Anticyclone
d. Extra tropical cyclones
Answer  Explanation 

ANSWER: Anticyclone


  • The summertime heating of the plateau of Tibet is the most important factor in the causation and maintenance of monsoonal circulation.
  • The Tibet Plateau is 600 kilometers wide in the west and 1,000 kilometers wide in the east. Its length is about 2,000 km. The average height of the plateau is about 4,000 meters. Thus, it is an enormous block of high ground acting as a formidable barrier. The summer-time heating of Tibetan Plateau makes it a heat source.
  • A warm-core anticyclone is formed over this plateau during the summer monsoon period. It is the result of a process called anticyclogenesis.

4)   Reduced land cover

a. Increases albedo effect of land over ocean
b. Decreases albedo effect of land over ocean
c. Has no effect on albedo
d. Increases albedo effect of land slightly but not more than the ocean
Answer  Explanation 

ANSWER: Increases albedo effect of land over ocean


  • An important contributor to monsoon weakening is the albedo effect of deforestation by humans.
  • Reduced land cover increases the reflectivity (albedo effect) which leads to cooling of land in contrast to the ocean and results in a weakened monsoon circulation.

5)   Anthropogenic atmospheric aerosols affect the monsoon in which of the following ways?

a. They reduce incoming solar radiation
b. They capture solar radiation, heating the atmosphere over land and sea affecting temperature difference needed for monsoon
c. They absorb water vapour reducing rains
d. All of the above
Answer  Explanation 

ANSWER: They reduce incoming solar radiation


  • Anthropogenic atmospheric aerosols, including sulphates, black carbon, nitrates and dust accumulate over the Indo-gangetic plains. These reduce incoming solar radiation over northern India and the northern Indian Ocean and lead to cooling on both land and sea resulting in a lowered thermal contrast.
  • Hence, monsoon winds and circulation are weakened as both land and sea are cooled. Evaporation is also suppressed. Over South Asia, over 50 per cent of aerosol emissions are caused by biomass and agricultural burning. There is mounting evidence of the emissions from South Asia and China in changing the timing, spatial distribution and strength of the monsoon.
  • However, negative impacts of these aerosols can be reduced quickly as they have a short lifetime of few weeks compared to GHGs which can stay in the atmosphere for up to 80 years.

6)   Assertion : The Arabian Sea branch of the monsoon is much more powerful than the Bay of Bengal branch.
Reason: The Arabian sea is larger than bay of bengal

a. Assertion & Reason both are correct and Reason is the correct explanation.
b. Assertion is wrong but reason is correct.
c. Assertion is correct but reason is wrong.
d. Both Assertion & reason are correct but reason is not the correct explanation of reason.
Answer  Explanation 

ANSWER: Assertion & Reason both are correct and Reason is the correct explanation.

The Arabian sea is larger than bay of bengal so more moisture is picked up by the monsoonal winds while passing over it.

7)   North west India receives rain in winter which is caused by

a. North East Monsoons
b. South West Monsoon
c. Western Disturbances
d. Trade winds
Answer  Explanation 

ANSWER: Western Disturbances

Western Disturbances originate in the Mediterranean sea and Atlantic ocean. These winds move towards the East bringing Cyclonic rain in temperate zone.

8)   Consider the following statements

1. North American monsoon gives rain to west coast in US

2. East Asian Monsoon gives rain to southern China, Korea and parts of Japan.

Which of the above statements is/are correct?

a. Only 1
b. Only 2
c. Both
d. None
Answer  Explanation 


No explanation is available for this question!