SSC CGL Geography – Interior of the Earth & Rocks – Level 2 · Exam Level · Tier I Sprint

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SSC CGL Geography – Interior of the Earth & Rocks – Level 2 · Exam Level · Tier I Sprint – 15 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.  
Statement-basedConsider:
I. The oceanic crust is thinner than the continental crust.
II. The oceanic crust is made mainly of SIAL.
Which is/are correct?

Correct Answer: B [Only I]

Explanation:

Oceanic crust ≈ 5 km and SIMA; continental ≈ 30 km and SIAL.

2.  
Match the followingMatch the rock with its group:
P. Basalt Q. Shale R. Slate S. Rock salt
1. metamorphic 2. chemically formed sedimentary 3. igneous 4. mechanically formed sedimentary

Correct Answer: A [P-3, Q-4, R-1, S-2]

Explanation:

Basalt – cooled lava; shale – deposited fragments; slate – changed shale; rock salt – precipitated from water.

3.  
Diagram-basedThe figure shows a section of the Earth with four layers W, X, Y and Z. Which layer is solid in spite of very high temperature, because of enormous pressure?

Correct Answer: C [Z]

Explanation:

From outside: W crust, X mantle, Y outer core (liquid), Z inner core (solid under enormous pressure).

4.  
Arrange in orderArrange the discontinuities from the surface towards the centre: Lehmann, Moho, Gutenberg, Conrad

Correct Answer: D [Conrad, Moho, Gutenberg, Lehmann]

Explanation:

Chennai Metro Goes Long: Conrad → Moho → Gutenberg → Lehmann.

5.  
Odd one outPumice, Basalt, Granite, Chalk

Correct Answer: B [Chalk]

Explanation:

Chalk is an organically formed sedimentary rock; the others are igneous.

6.  
Assertion–Reason
A: S-waves are not recorded at stations more than 105° away from the epicentre.
R: The outer core of the Earth is liquid.

Correct Answer: C [Both A and R are true and R explains A]

Explanation:

S-waves cannot cross the liquid outer core.

7.  
How many statements are trueHow many of these statements are true?
I. P-waves are the fastest earthquake waves.
II. Surface waves are the most destructive.
III. S-waves can travel through liquids.
IV. P-waves can pass through gases.

Correct Answer: A [3]

Explanation:

Only III is false – S-waves travel through solids only.

8.  
The second most abundant element in the Earth's crust (by weight) is:

Correct Answer: D [Silicon]

Explanation:

O 46.60% > Si 27.72% > Al 8.13% > Fe 5.00%.

9.  
Which of these minerals can scratch quartz?

Correct Answer: A [Topaz]

Explanation:

Topaz (8) > quartz (7); the others are below 7.

10.  
Two-quantity comparison
Quantity I: Mohs hardness of orthoclase
Quantity II: Mohs hardness of apatite

Correct Answer: A [Quantity I > Quantity II]

Explanation:

Orthoclase = 6, apatite = 5.

11.  
The asthenosphere is a part of the:

Correct Answer: C [upper mantle]

Explanation:

Soft, partly molten upper mantle below the lithosphere.

12.  
Diagram-basedIn the figure, station S is 155° away from the epicentre. Which earthquake waves will it record?

Correct Answer: D [Only P]

Explanation:

Beyond 145° P-waves arrive after passing through the core; S-waves cannot cross the liquid outer core.

13.  
Coal is a/an:

Correct Answer: B [organically formed sedimentary rock]

Explanation:

Coal forms from buried plant remains.

14.  
Reverse question“I am coarse-grained, light-coloured, rich in silica and I formed deep underground.” Which rock am I?

Correct Answer: D [Granite]

Explanation:

Coarse + deep = intrusive; light + silica-rich = acid → granite.

15.  
Spot My Mistake“Gneiss is formed by the metamorphism of limestone.” What is the correct statement?

Correct Answer: C [Gneiss is formed from granite]

Explanation:

Granite → gneiss; limestone → marble.

➤ 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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