NSTSE (National Science Talent Search Exam- Unified Council) Class 8: Questions 2008 - 2013 of 2028

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Question number: 2008

» Chemistry » Pollution of Air and Water

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Question

What is the composition of ozone?

Choices

Choice (4) Response

a.

One carbon atom and two oxygen atoms

b.

Three oxygen atoms

c.

Three carbon atoms

d.

One oxygen atom and two hydrogen atoms

Question number: 2009

» Chemistry » Synthetic Fibers and Plastics

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Question

What is the full form of PTFE (polymer)?

Choices

Choice (4) Response

a.

Polymethyl methyl acrylate

b.

Polyacrylonitrile

c.

Polyvinyl chloride

d.

Teflon-polytetrafluoroethylene

Question number: 2010

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

Which of the following is the reason for:

(i) Instant death of certain organisms

(ii) Increase in population of algal.

Choices

Choice (4) Response

a.

Discharge of heat from electrical power stations

b.

Discharge of oils into water

c.

Discharge of detergents into waste

d.

None of the above

Question number: 2011

» Chemistry » Synthetic Fibers and Plastics

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Question

Which of the following bacteria can cause “The sorters” disease?

Choices

Choice (4) Response

a.

Virus

b.

Aedes

c.

Bacillus

d.

Anthrax

Question number: 2012

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

Which one is not a correct statement?

Choices

Choice (4) Response

a.

Primary pollutants are those which are emitted directly from the source

b.

Particulates refer to all atmospheric substances that are not gases.

c.

Secondary pollutants are those which are formed in the atmosphere by chemical interactions among primary pollutants and atmospheric constituents

d.

Acidrain is primary pollutant

Question number: 2013

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

Which of the following is a source of lead particles in atmosphere?

Choices

Choice (4) Response

a.

Petrol in automobiles

b.

Coal in thermal power stations

c.

Biomass in chullahs

d.

LPG for cooking

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