Chapter Exam

Chapter 3: Interior of the Earth — Online MCQ Test

Q: Which seismic wave travels fastest through the Earth?

Answer: A. P-wave — P-waves are the fastest seismic waves and travel through both solid and liquid materials. They are the first to be recorded on seismographs.

Q: The Earth's crust is divided into how many main types?

Answer: B. Two — The crust is mainly divided into continental crust and oceanic crust. These two types differ in thickness, composition, and density.

Q: Which statement best explains why S-waves do not travel through the outer core?

Answer: B. The outer core is liquid — S-waves can travel only through solids, not liquids. Since the outer core is liquid, S-waves cannot pass through it.

Q: A sudden release of energy along a fault inside the Earth causes:

Answer: B. An earthquake — An earthquake occurs when stress built up in the Earth is suddenly released along a fault. This release generates seismic waves.

Q: The Gutenberg discontinuity is found between the:

Answer: C. Mantle and outer core — The Gutenberg discontinuity marks the boundary between the mantle and the outer core. It is identified through changes in seismic wave transmission.

GEOGRAPHY · Grade 11 · CBSE(NCERT)

Practice Chapter 3: Interior of the Earth with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 GEOGRAPHY. This chapter covers: Crust mantle core seismic waves earthquakes volcanoes Earth's interior rock layers geology tectonic structure. 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 CBSE(NCERT) Grade 11 GEOGRAPHY — Chapter 3: Interior of the Earth, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which seismic wave travels fastest through the Earth?

A. P-wave ✓
B. S-wave
C. Surface wave
D. Love wave

Answer: A. P-wave
P-waves are the fastest seismic waves and travel through both solid and liquid materials. They are the first to be recorded on seismographs.

The Earth's crust is divided into how many main types?

A. One
B. Two ✓
C. Three
D. Four

Answer: B. Two
The crust is mainly divided into continental crust and oceanic crust. These two types differ in thickness, composition, and density.

Which statement best explains why S-waves do not travel through the outer core?

A. The outer core is too cold
B. The outer core is liquid ✓
C. The outer core is too thin
D. The outer core is made of rock only

Answer: B. The outer core is liquid
S-waves can travel only through solids, not liquids. Since the outer core is liquid, S-waves cannot pass through it.

A sudden release of energy along a fault inside the Earth causes:

A. A cyclone
B. An earthquake ✓
C. A landslide
D. A tsunami only

Answer: B. An earthquake
An earthquake occurs when stress built up in the Earth is suddenly released along a fault. This release generates seismic waves.

The Gutenberg discontinuity is found between the:

A. Crust and mantle
B. Upper mantle and lower mantle
C. Mantle and outer core ✓
D. Outer core and inner core

Answer: C. Mantle and outer core
The Gutenberg discontinuity marks the boundary between the mantle and the outer core. It is identified through changes in seismic wave transmission.

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