NSTSE (National Science Talent Search Exam- Unified Council) Class 8: Questions 2021 - 2026 of 2028

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Question number: 2021

» Chemistry » Synthetic Fibers and Plastics

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Question

In the process of obtaining silk, the rearing of silk warms is called?

Choices

Choice (4) Response

a.

Sericulture

b.

Pisciculture

c.

Arboriculture

d.

All of the above

Question number: 2022

» Chemistry » Pollution of Air and Water

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Question

The leaching of chemical fertilizers into rivers and ponds cause

Choices

Choice (4) Response

a.

Increase the oxygen levels of water

b.

Increase in number of aquatic organisms

c.

Air pollution

d.

The rapid growth of algal

Question number: 2023

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

If BOD of river is high, it means that the river is?

Choices

Choice (4) Response

a.

Very-much polluted with inorganic chemicals

b.

Very-much polluted with inorganic chemicals which are decomposed by micro-organism

c.

Polluted with Pesticides

d.

Not polluted

Question number: 2024

» Chemistry » Synthetic Fibers and Plastics

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Question

Which of the following is used to make non-stick cookwares?

Choices

Choice (4) Response

a.

Polytetrafluoroethylene

b.

Polyvinyl Cookwares?

c.

Polystyrene

d.

Polyethylene Terephthalate

Question number: 2025

» Chemistry » Pollution of Air and Water

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MCQ▾

Question

The water pollutant that is incorrectly paired with the source?

Choices

Choice (4) Response

a.

Oil spill – ship

b.

Sewage – large factory

c.

Nitrate - Farm

d.

Pesticide – oil palm plantation

Question number: 2026

» Chemistry » Synthetic Fibers and Plastics

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MCQ▾

Question

Which one of the statement is not true?

Choices

Choice (4) Response

a.

Cellulose is madeup of glucose units

b.

Nylon is used to make parachute

c.

Cotton thread is stronger than nylon thread

d.

Polymer occur in nature

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