Class 10 Chemistry Exam MCQs – Practice Test 4 (Chapter 10)

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The Atmosphere MCQs – Practice Test 4 PDF Download

MCQ 16: The atmosphere consists of:

gases only
water vapors only
chemicals
gases and water vapors

MCQ 17: The atmospheric layer closest to the earth's surface is:

troposphere
mesosphere
stratosphere
thermosphere

MCQ 18: Ozone gas (O₃) has:

unpleasant odor
pleasant odor
no odor
orange color

MCQ 19: The reformation of ozone in the stratosphere is powered by:

ultraviolet radiation
atmospheric oxygen
sunlight
heat

MCQ 20: Ozone (O_?) comprises of:

one oxygen atom
2 oxygen atoms
3 oxygen atoms
4 oxygen atoms

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