Rocks and Their Types NDA Questions

NDA Physical Geography

Rocks and Their Types MCQ Questions


13.
Precious metals are classified as which type of mineral?
A.
Non-metallic minerals
B.
Metallic minerals
C.
Organic minerals
D.
Silicate minerals
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ANSWER :
B. Metallic minerals
14.
Igneous rocks are also called 'primary rocks' because:
A.
They are always the hardest rocks
B.
They were the first rocks ever studied by scientists
C.
All other rocks (sedimentary and metamorphic) are ultimately derived from them
D.
They form only at the Earth's surface
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ANSWER :
C. All other rocks (sedimentary and metamorphic) are ultimately derived from them
15.
The word 'igneous' is derived from the Latin word 'ignis' which means:
A.
Liquid
B.
Earth
C.
Rock
D.
Fire
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ANSWER :
D. Fire
16.
Igneous rocks are classified based on:
A.
Texture (size of grains/crystals)
B.
Colour only
C.
Density only
D.
Their age
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ANSWER :
A. Texture (size of grains/crystals)
17.
When magma cools SLOWLY deep inside the Earth's crust, it forms:
A.
Glassy rocks with no crystals
B.
Fine-grained extrusive rocks
C.
Coarse-grained intrusive (plutonic) igneous rocks with large crystals
D.
Vesicular porous rocks
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ANSWER :
C. Coarse-grained intrusive (plutonic) igneous rocks with large crystals
18.
When lava cools RAPIDLY on the Earth's surface, it forms:
A.
Fine-grained extrusive (volcanic) igneous rocks with small crystals
B.
Metamorphic rocks
C.
Porphyritic rocks with mixed grain sizes
D.
Coarse-grained intrusive rocks
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ANSWER :
A. Fine-grained extrusive (volcanic) igneous rocks with small crystals