Chapter Exam

Chapter-5 Rocks and Soils — Online MCQ Test

Q: Which type of rock is formed from the cooling and solidification of molten magma?

Answer: B. Igneous rock — Igneous rocks are formed when magma or lava cools and solidifies. They are known as primary rocks.

Q: Which of the following is a major soil type found in India?

Answer: D. All the above — Black, red, and alluvial soils are all major soil types in India. They are widely distributed in different regions.

Q: What happens when sediments are compacted and cemented over a long period?

Answer: C. They form sedimentary rocks — Sediments get compacted and cemented to form sedimentary rocks. This is a key step in the rock cycle.

SOCIAL · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-5 Rocks and Soils with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SOCIAL. This chapter covers: Igneous Sedimentary Metamorphic Soil conservation Rock cycle Explains the classification of rocks rock cycle and major soil types in India. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-5 Rocks and Soils — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SOCIAL — Chapter-5 Rocks and Soils, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which type of rock is formed from the cooling and solidification of molten magma?

A. Sedimentary rock
B. Igneous rock ✓
C. Metamorphic rock
D. Soil rock

Answer: B. Igneous rock
Igneous rocks are formed when magma or lava cools and solidifies. They are known as primary rocks.

Which of the following is a major soil type found in India?

A. Black soil
B. Red soil
C. Alluvial soil
D. All the above ✓

Answer: D. All the above
Black, red, and alluvial soils are all major soil types in India. They are widely distributed in different regions.

What happens when sediments are compacted and cemented over a long period?

A. They become igneous rocks
B. They become metamorphic rocks
C. They form sedimentary rocks ✓
D. They turn into magma

Answer: C. They form sedimentary rocks
Sediments get compacted and cemented to form sedimentary rocks. This is a key step in the rock cycle.

Why are sedimentary rocks often found in layers?

A. Because they are formed from magma
B. Because sediments are deposited one after another over time ✓
C. Because they are always formed under high pressure
D. Because they are made of crystals only

Answer: B. Because sediments are deposited one after another over time
Sedimentary rocks form through the deposition of sediments in layers. These layers are usually visible in the rock structure.

Which option best explains how a metamorphic rock can become an igneous rock in the rock cycle?

A. It is directly compressed into lava
B. It melts into magma and then cools and solidifies ✓
C. It is broken into sediments and instantly hardens
D. It changes only by weathering

Answer: B. It melts into magma and then cools and solidifies
A metamorphic rock can melt to form magma. When magma cools and solidifies, it becomes igneous rock.

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