NSO Level 1- Science Olympiad (SOF) Class 8: Questions 495 - 499 of 1076

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Question number: 495

» Synthetic Fibres and Plastics

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MCQ▾

Question

Identify the names from the given clues

A synthetic fibre which looks like silk and obtained by chemical treatment of Wood pulp

Choices

Choice (4) Response

a.

Terylene

b.

Nylon

c.

Polyester

d.

Rayon

Question number: 496

» Metals and Non-Metals

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MCQ▾

Question

Megha got a magnesium ribbon from the science lab. She burnt it, took the ash and mixed it in water. Then she tested the solution with a litmus paper. Red litmus paper turned blue. This shows that

Choices

Choice (4) Response

a.

The solution is neither acidic nor basic

b.

The solution is acidic in nature

c.

The solution is basic in nature

d.

Question does not provide sufficient data or is vague

Question number: 497

» Metals and Non-Metals

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MCQ▾

Question

Sita bought a copper lamp as a decorative piece and displayed it in her show case. After a month she found that it looked dull with green patches on it. She was so shocked to see this. The Chemical reaction taken place here is

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 498

» Metals and Non-Metals

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MCQ▾

Question

Bells are made of metals. Which property of metals is used here?

Choices

Choice (4) Response

a.

Metals are ductile

b.

Metals are lustrous

c.

Metals are malleable

d.

Metals are sonorous

Question number: 499

» Synthetic Fibres and Plastics

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MCQ▾

Question

Identify the polymers from its use

It is used as pipes in plumbing and electric wiring.

Choices

Choice (4) Response

a.

Nylon

b.

Teflon

c.

PVC

d.

Polythene

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