Which one of the following is the correct sequence of layers as we move from the Earth's surface upwards?
- A.Troposphere, Stratosphere, Thermosphere, Mesosphere
- B.Troposphere, Stratosphere, Mesosphere, Thermosphere
- C.Thermosphere, Mesosphere, Stratosphere, Troposphere
- D.Stratosphere, Mesosphere, Troposphere, Thermosphere
Correct answer
Explanation
The correct answer is B, Troposphere, Stratosphere, Mesosphere, Thermosphere. This is the order of the layers of the atmosphere from the ground upwards, with the exosphere above them all.
The troposphere reaches about 8 km at the poles and about 18 km at the equator; it holds nearly all the water vapour, so clouds, rain and weather happen here, and temperature falls with height. The stratosphere, up to about 50 km, contains the ozone layer and its calm air suits jet aircraft. In the mesosphere, up to about 80 km, temperature falls to the lowest in the atmosphere and meteors burn up. The thermosphere above it contains the ionosphere, which reflects radio waves and shows the auroras.
A puts the thermosphere below the mesosphere, which reverses the top two layers.
C gives the order from the top downwards, not from the surface upwards.
D wrongly places the stratosphere and mesosphere below the troposphere.
Exam tip: from the ground up, "The Strong Man Throws Everything": Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere.
Practice Questions
View allWhich of the following geographical features or phenomena is/are associated with the Peninsular Block of India ?
1. Submergence of parts of the western coast due to tectonic activity
2. Presence of residual mountain ranges such as the Veliconda hills and Mahendragiri hills
3. Deep, V-shaped river valleys formed by fast-flowing rivers
Select the answer using the code given below :
- A.1 only
- B.1 and 2
- C.2 and 3
- D.3 only
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The Peninsular Block is an old, stable landmass with worn-down residual hills and a western edge that sank along faults, but its rivers flow in broad, shallow valleys.
Read the full explanation →The term "Levant" often heard in the news roughly corresponds to which of the following regions ?
- A.Region along the eastern Mediterranean shores
- B.Region along North African shores stretching from Egypt to Morocco
- C.Region along Persian Gulf and Horn of Africa
- D.The entire coastal areas of Mediterranean Sea
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The Levant is the land on the eastern coast of the Mediterranean Sea in West Asia. The word comes from the French 'lever', to rise, meaning the land where the sun rises, as seen from Europe.
Read the full explanation →With reference to the climate of Andaman and Nicobar Islands, which of the following statements is/are correct ?
1. The climate can be defined as a humid, tropical coastal climate.
2. It receives rainfall from both South-west monsoon and North-east monsoon.
3. Maximum precipitation is between December and May.
Select the answer using the code given below :
- A.1 only
- B.1 and 2
- C.2 and 3
- D.3 only
Show answer
The islands have a warm, humid tropical maritime climate and get rain from both monsoons, but December to May is their drier part of the year.
Read the full explanation →Consider the following pairs :
Peak — Mountains
1. Namcha Barwa — Garhwal Himalaya
2. Nanda Devi — Kumaon Himalaya
3. Nokrek — Sikkim Himalaya
Which of the pairs given above is/are correctly matched?
- A.1 and 2
- B.2 only
- C.1 and 3
- D.3 only
Show answer
Nanda Devi belongs to the Kumaon Himalaya, but Namcha Barwa and Nokrek are wrongly placed. Nanda Devi (7,816 m) is the highest peak lying wholly within India and the highest in Uttarakhand.
Read the full explanation →Consider the following pairs :
Famous place — River
1. Pandharpur : Chandrabhaga
2. Tiruchirappalli : Cauvery
3. Hampi : Malaprabha
Which of the pairs given above are correctly matched?
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
Pandharpur stands on the Chandrabhaga and Tiruchirappalli on the Cauvery, but Hampi lies on the Tungabhadra, not the Malaprabha. Pandharpur in Solapur district of Maharashtra is the seat of Lord Vitthal (Vithoba) and the goal of the Warkari pilgrimage.
Read the full explanation →