Question

The dust storms originating in Rajasthan in May and June months are caused due to

(A) origin of convectional currents at few places.

(B) Aravali hills are parallel to southwestern winds

(C) origin of fast speedy easterly winds

1. (A) and (C)
2. (A), (B) and (C)
3. (A) and (B)
4. Only (A)

Answer 1

Correct Answer - Option 4 : Only (A)

The correct answer is Only (A).

• The dust storms originating in Rajasthan in May and June months are caused due to origin of convectional currents at few places.​

• Convectional currents
  • Convection is the circular motion that happens when warmer air, which has faster-moving molecules, less dense, rises, while the cooler air drops down. 
  • Convection is a major factor in weather.
  • It can result in the wind, clouds, or other weather like Storm.
  • In Rajasthan, sandstorms become more frequent because the strong heating of the air over the desert causes the lower atmosphere to become unstable.
  • This instability mixes strong winds in the middle troposphere downward to the surface, producing stronger winds at the surface.
  • Dust storms are caused by very strong winds or Convectional currents, often produced by thunderstorms.
  • Rajasthan experiences extreme hot climate during the summer seasons.
  • The months of May and June are considered as peak times when summer is at its peak.
  • During this time the place also experiences intense level in hot climatic conditions.
  • The formation of heat is also linked with the formation of conventional currents within this climatic belt. Hence option 1 is correct.

•  Aravalli hills parallel to southwestern winds
  • The Aravallis system lies parallel to the direction of South West monsoon winds coming from the Arabian Sea.
  • So this mountain system is unable to check these winds and hence, western Rajasthan is a low rainfall area or dry. ​Hence option 2 is incorrect.