SSC CGL Geography – Interior of the Earth & Rocks – Tier II Level · Marathon

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SSC CGL Geography – Interior of the Earth & Rocks – Tier II Level · Marathon – 10 questions, subject: Geography – India & World. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
The S–P interval at a station is 30 s. Taking P at 6 km/s and S at 3.5 km/s, the distance of the earthquake is:

Correct Answer: B [252 km]

Explanation:

d = 30 × 6 × 3.5 ÷ 2.5 = 252 km.

2.  
Under a continent the crust is about 35 km thick and the Gutenberg discontinuity lies at ≈ 2,900 km. The thickness of the mantle there is about:

Correct Answer: D [2,865 km]

Explanation:

2,900 − 35 = 2,865 km (the mantle lies between the Moho and the Gutenberg discontinuity).

3.  
What is the minimum number of seismograph stations needed to locate an epicentre by drawing distance circles?

Correct Answer: B [3]

Explanation:

Two circles meet at two points; a third circle fixes one point.

4.  
Two-quantity comparison
Quantity I: thickness of the outer core
Quantity II: radius of the inner core

Correct Answer: A [Quantity I > Quantity II]

Explanation:

2,250 km vs 6,371 − 5,150 = 1,221 km.

5.  
Statement-basedConsider stations more than 145° from an epicentre:
I. They record P-waves that have passed through the core.
II. They record S-waves.
Which is/are correct?

Correct Answer: A [Only I]

Explanation:

No S-waves beyond 105°; P-waves reappear beyond 145°.

6.  
Mineral X scratches calcite but is scratched by apatite. X is:

Correct Answer: D [Fluorite]

Explanation:

Between 3 and 5 → 4 = fluorite.

7.  
Match the followingMatch the sedimentary rock with how it forms:
P. Sandstone Q. Rock salt R. Chalk
1. organically 2. chemically 3. mechanically

Correct Answer: C [P-3, Q-2, R-1]

Explanation:

Sand grains cemented; salt precipitated; chalk from tiny shells.

8.  
At a station 60° from an epicentre, in which order do the waves arrive?

Correct Answer: A [P, then S, then surface waves]

Explanation:

Fastest first: P > S > surface waves.

9.  
A banded metamorphic rock was formed from granite under regional metamorphism. The rock is:

Correct Answer: C [Gneiss]

Explanation:

Granite → gneiss (coarse, banded).

10.  
Odd one outMarble, Slate, Gneiss, Conglomerate

Correct Answer: D [Conglomerate]

Explanation:

Conglomerate is a sedimentary rock (cemented pebbles); the others are metamorphic.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Geography – India & World book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-geography-india-world

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