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
Question
What is the composition of ozone?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | One carbon atom and two oxygen atoms |
|
| b. | Three oxygen atoms |
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| c. | Three carbon atoms |
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| d. | One oxygen atom and two hydrogen atoms |
|
Question number: 2009
» Chemistry » Synthetic Fibers and Plastics
Question
What is the full form of PTFE (polymer)?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Polymethyl methyl acrylate |
|
| b. | Polyacrylonitrile |
|
| c. | Polyvinyl chloride |
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| d. | Teflon-polytetrafluoroethylene |
|
Question number: 2010
» Chemistry » Pollution of Air and Water
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 |
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| d. | None of the above |
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Question number: 2011
» Chemistry » Synthetic Fibers and Plastics
Question
Which of the following bacteria can cause “The sorters” disease?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Virus |
|
| b. | Aedes |
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| c. | Bacillus |
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| d. | Anthrax |
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Question number: 2012
» Chemistry » Pollution of Air and Water
Question
Which one is not a correct statement?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | Primary pollutants are those which are emitted directly from the source |
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| b. | Particulates refer to all atmospheric substances that are not gases. |
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| c. | Secondary pollutants are those which are formed in the atmosphere by chemical interactions among primary pollutants and atmospheric constituents |
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| d. | Acidrain is primary pollutant |
|
Question number: 2013
» Chemistry » Pollution of Air and Water
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 |
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| d. | LPG for cooking |
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