Want to crack UPSC 2026? This is your Fast Track to Success! 🚀

Tired of scattered resources & endless confusion? The Sleepy Classes IAS UPSC GS Mentorship Course for 2026 is your all-in-one solution!

What you get:

1. Recorded lectures with PDF notes
2. Updated Current Affairs videos
3. Topic-wise quizzes
4. Live weekly sessions—25 MCQs practice + mains answer writing with expert evaluation

Dedicated Guru mentorship for ongoing guidance

💥 Get 10% OFF with code: MAINS26
🔖 Only at ₹20,999/-

Link for trial classes : https://courses.sleepyclasses.com/learn/Fast-Track---GS-Mentorship-Course-for-2026

Q.1. Which one of the following is the type of plate boundary along the San Andreas fault ?

A. Ocean-continent convergence
B. Divergent boundary
C. Transform boundary
D. Continent-continent convergence

Q.2.Consider the following statements :

1. It was realised that all along the midoceanic ridges, volcanic eruptions are common and they bring huge amounts of lava to the surface in this area.

2. The rocks equidistant on either side of the crest of mid-oceanic ridges show remarkable similarities in terms of period. of formation, chemical compositions and magnetic properties.

3. The belt of ancient rocks of 2,000 million years from Brazil coast matches with those from western Africa.

4. The ocean crust rocks are much younger than the continental rocks.

Q.3.Consider the following statements :

1. Water vapour is a variable gas in the atmosphere, which decreases with altitude.

2. In the warm and wet tropics, it may account for four per cent of the air by volume, while in the dry and cold areas of desert and polar regions, it may be less than one per cent of the air.

3. Water vapour increases from the equator towards the poles.

4. Water vapour contributes to the stability and instability in the air.

Q.1. Consider the following statements :

1. Dust particles are generally concentrated in the lower layers of the atmosphere; yet, convectional air currents may transport them to great heights.

2. The higher concentration of dust particles is found in subtropical and polar regions due to dry winds in comparison to equatorial and temperate regions.

3. Dust and salt particles act as hydrophobic nuclei around which water vapour condenses to produce clouds.

Q.2.Which of the following represents the correct descending order of the top four most abundant gases in Earth's atmosphere by percentage composition ?

A. Nitrogen > Oxygen Argon > Carbon Dioxide

B. Oxygen Nitrogen Argon > Carbon Dioxide

C. Nitrogen Carbon Dioxide Oxygen > Argon

D. Oxygen Carbon Dioxide > Nitrogen > Argon

Q.3.With reference to the layers of the atmosphere, consider the following statements :

1. The thickness of the troposphere is greatest at the equator because heat is transported to great heights by strong convectional currents.

2. The air temperature at the tropopause is about -80°C over the poles and about -45°C over the equator.

3. In the mesosphere, temperature starts decreasing with the increase in altitude and reaches up to -100°C at a height of 80 km.

4. Radio waves transmitted from the Earth are reflected back to the Earth by the ionosphere.