Chapter Exam

Chapter 3: Interior of the Earth — Online MCQ Test

Q: Which layer of the Earth is the thinnest?

Answer: C. Crust — The crust is the outermost and thinnest layer of the Earth. It is much thinner than the mantle and core.

Q: The boundary between the Earth's crust and mantle is called the:

Answer: B. Moho discontinuity — The Mohorovičić discontinuity, or Moho, separates the crust from the mantle. It is identified by a sudden change in seismic wave velocity.

Q: Which one of the following is a type of seismic wave?

Answer: C. Both P-waves and S-waves — P-waves are longitudinal, while S-waves are transverse. Both are seismic waves generated during an earthquake.

Q: If S-waves are not detected beyond a certain point on the Earth's surface, the most likely conclusion is that the region they cannot pass through is:

Answer: B. Liquid outer core — S-waves cannot travel through liquids, so their disappearance indicates the presence of a liquid layer. This is one of the key proofs for the liquid outer core.

Q: A volcano with a wide base, gentle slopes, and fluid lava eruptions is most likely a:

Answer: A. Shield volcano — Shield volcanoes are built by low-viscosity lava that spreads over a large area, forming broad and gentle slopes. This is unlike steep composite or cinder cone volcanoes.

GEOGRAPHY · CLASS 11 FIRST PUC · Karnataka State Board

Practice Chapter 3: Interior of the Earth with a free chapter-wise online MCQ test for Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY. This chapter covers: This chapter details crust mantle core layers seismic wave analysis earthquake causes intensity distribution volcanic activity volcano types and rock mineral classifications.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 3: Interior of the Earth — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 11 FIRST PUC GEOGRAPHY — Chapter 3: Interior of the Earth, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which layer of the Earth is the thinnest?

A. Mantle
B. Core
C. Crust ✓
D. Asthenosphere

Answer: C. Crust
The crust is the outermost and thinnest layer of the Earth. It is much thinner than the mantle and core.

The boundary between the Earth's crust and mantle is called the:

A. Gutenberg discontinuity
B. Moho discontinuity ✓
C. Conrad discontinuity
D. Lehmann discontinuity

Answer: B. Moho discontinuity
The Mohorovičić discontinuity, or Moho, separates the crust from the mantle. It is identified by a sudden change in seismic wave velocity.

Which one of the following is a type of seismic wave?

A. Longitudinal wave
B. Transverse wave
C. Both P-waves and S-waves ✓
D. Circular wave

Answer: C. Both P-waves and S-waves
P-waves are longitudinal, while S-waves are transverse. Both are seismic waves generated during an earthquake.

If S-waves are not detected beyond a certain point on the Earth's surface, the most likely conclusion is that the region they cannot pass through is:

A. Solid mantle
B. Liquid outer core ✓
C. Crustal plateau
D. Continental shelf

Answer: B. Liquid outer core
S-waves cannot travel through liquids, so their disappearance indicates the presence of a liquid layer. This is one of the key proofs for the liquid outer core.

A volcano with a wide base, gentle slopes, and fluid lava eruptions is most likely a:

A. Shield volcano ✓
B. Composite volcano
C. Cinder cone volcano
D. Caldera volcano

Answer: A. Shield volcano
Shield volcanoes are built by low-viscosity lava that spreads over a large area, forming broad and gentle slopes. This is unlike steep composite or cinder cone volcanoes.