Environmental Science and Ecology - Mock Test 4

Question 31

BOD test of biological oxygen demand test is made for measuring

A) air pollution B) water pollution C) noise pollution D) soil pollution

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Question 32

In case COâ‚‚ of earth's atmosphere disappears, the temperature of earth's surface would

A) increase B) decrease C) depend on oxygen concentration D) remain the same

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Question 33

Ozone layer is formed in which zone of atmosphere

A) mesosphere B) stratosphere C) troposphere D) ionosphere

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Question 34

All organic substance found in the biosphere necessarily contain

A) silica B) carbon C) oxygen D) nitrogen

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Question 35

In the environment, ozone is known for its

A) harmful effects B) useful effects C) both a and b D) inert nature

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Question 36

<u>Good ozone</u> is found in the

A) mesosphere B) troposphere C) stratosphere D) ionosphere

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Question 37

Biochemical Oxygen Demand ( BOD ) in a river water

A) has no relationship with concentration of oxygen in the water B) gives a measure of Salmonella in the water C) increases when sewage gets mixed with river water D) remains unchanged when algal bloom occurs

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Question 38

Which one of the following pairs is mismatched

A) Fossil fuel burning - release of CO2 B) Nuclear power - radioactive wastes C) Solar energy - green house effect D) Biomass burning - release of CO2

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Question 39

A major component of gobar gas is

A) ammonia B) methane C) ethane D) butane

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Question 40

Which of the following is a secondary pollutant

A) CO B) CO2 C) Peroxy acetyl nitrate (PAN) D) Aerosol

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