Question # 1

The height of troposphere above earth's surface is

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10 km

18 km

20 km

40 km

The coldest layer of the atmosphere

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Troposphere

Stratosphere

Mesosphere

Thermosphere

The temperature in the mesosphere is

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-10°C

-100°C

-60°C

-80°C

Ultra violet radiations can cause.

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Cancer

Eye disease

None

Both a and b

-------------- is a mixture of gases like methane, ethane and propane etc.

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Coal

Petroleum

Natural gas

Botha a and b

Ozone is a gas present in.

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Troposphere

Stratosphere

Upper stratosphere

Meso sphere

The total number of people living together in an area at a particular time is called

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special

population

community

habitat

It is used in microprocessor of computer

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chromite

aluminium

silicon

iron

The percentage of oxygen in Air is

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78%

21%

0.04%

33%

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General Science 9th Class English Medium Chapter 6 Online Test MCQs With Answers

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