CBSE-NET (UGC) Environmental Science (Paper-II & Paper-III): Questions 275 - 280 of 376

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Question number: 275

» Introduction of Environmental Science » Earth, Man and Environment

Appeared in Year: 2011

Assertion-Reason▾

Assertion (Ꭺ)

Available data suggest that the first cells on earth were anaerobic heterotrophs. (December)

Reason (Ꭱ)

In the beginning, the earth’s atmosphere probably lacked free oxygen.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

Question number: 276

» Energy Resources » Cabon Dioxide Emission

Appeared in Year: 2009

MCQ▾

Question

Among the following which country has lowest per capita greenhouse gas emission? – (December)

Choices

Choice (4) Response

a.

France

b.

Mexico

c.

China

d.

India

Question number: 277

» Chemical Composition of Air » Particles, Ions and Radicals in the Atmosphere

Appeared in Year: 2011

MCQ▾

Question

Chemical formula for CFC-113 is (December)

Choices

Choice (4) Response

a.

CCl2F2

b.

CCl2F3

c.

CCl3F3

d.

C2Cl3F3

Question number: 278

» Basics of Environmental Geosciences » Water Resources and Environment » Ocean Pollution by Toxic Wastes

Appeared in Year: 2011

MCQ▾

Question

According to aquatic life standard for level of iron is - (December)

Choices

Choice (4) Response

a.

5 mgL

b.

10 mgL

c.

50 mgL

d.

1 mgL

Question number: 279

» Air » Monitoring and Control of Air Pollution

Appeared in Year: 2009

MCQ▾

Question

Which one of the following air pollution control device has highest efficiency in controlling dust? – (December)

Choices

Choice (4) Response

a.

Wet Scrubber

b.

Venturi Scrubber

c.

Electrostatic precipitator

d.

Cyclonic spray scrubber

Question number: 280

» Ecosystems » Structure and Functions

Appeared in Year: 2009

MCQ▾

Question

The aggregation of all eco systems on the earth is referred to as- (December)

Choices

Choice (4) Response

a.

Ecosphere

b.

Atmosphere

c.

Ionosphere

d.

Stratosphere

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