Read the following statements:
Statement 1: The process of vertical heating of the atmosphere is known as advection.
Statement 2: The transfer of heat through horizontal movement of air is called convection.
Statement 3: 'Loo' winds in northern India during summer are caused by advection.
Which of the above statements is/are correct?
Show answer & explanation
Correct answer: D
Explanation
Answer: Only Statement 3 is correct
Explanation: Let’s evaluate each statement:
Statement 1: Incorrect
The vertical transfer of heat in the atmosphere is called convection, not advection.
Advection = horizontal movement of heat
Convection = vertical movement of heat
Statement 2: Incorrect
This is reversed.
Horizontal movement of heat by wind is called advection, not convection.
Convection refers to vertical air movement due to heating and rising of warm air.
Statement 3: Correct
The ‘Loo’ winds in northern India during summer are hot, dry winds that blow horizontally over land, mainly due to advection of hot air masses from desert regions.
So, only Statement 3 is correct.
Additional Key Points:
Convection: Vertical movement (rise of warm air, sink of cool air) → causes thunderstorms and cloud formation
Advection: Horizontal movement of air → responsible for heatwaves, cold waves
Loo winds:
Occur in May–June
Hot and dry
Common in Rajasthan, Punjab, Haryana, Uttar Pradesh
Can cause heat strokes
Potential Exam-Oriented Questions & Answers:
Question: Which wind causes heatwaves in North India?
Answer: Loo winds.
Question: What is the main difference between convection and advection?
Answer: Convection is vertical heat transfer; advection is horizontal heat transfer.