Which period witnessed the largest mass extinction in Earth's history? MCQ with Answer and Explanation

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Which period witnessed the largest mass extinction in Earth's history?

A. Ordovician

B. Permian

C. Jurassic

D. Cretaceous

Answer: Option B

Solution (By JKSSB Mock Tests)

The Permian-Triassic extinction event eliminated about 90% of marine species.

This question belongs to: Geography GK Physical Geography

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Question #1

Which mineral is the hardest on the Mohs scale?

A. Diamond

B. Corundum

C. Quartz

D. Topaz

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Correct Answer: Option A

Explanation:
Diamond has a hardness of 10 on the Mohs scale, making it the hardest naturally occurring mineral.

This question belongs to: Geography GK Physical Geography

Question #2

Loess deposits are primarily composed of:

A. Glacial Till

B. Marine Clay

C. Wind-blown Silt

D. Volcanic Ash

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Correct Answer: Option C

Explanation:
Loess consists of fine wind-deposited silt and is highly fertile.

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Question #3

Which is the world's largest river by discharge volume?

A. Yangtze

B. Nile

C. Amazon

D. Mississippi

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Correct Answer: Option C

Explanation:
The Amazon River carries the greatest volume of water of any river in the world.

This question belongs to: Geography GK Physical Geography

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