NSO Level 1- Science Olympiad (SOF) Class 8: Questions 441 - 446 of 1076

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Passage

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

Question number: 441 (3 of 3 Based on Passage) Show Passage

» Metals and Non-Metals

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MCQ▾

Question

The chemical reaction that took place in the experiment was

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 442

» Synthetic Fibres and Plastics

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MCQ▾

Question

We are familiar with the four R’s used in environment protection. Identify the R used in the situations

Rani always purchases things which are very much necessary for her. She never purchase and store things which spoil easily, in bulk quantity.

Choices

Choice (4) Response

a.

Reuse

b.

Recover

c.

Recycle

d.

Reduce

Question number: 443

» Metals and Non-Metals

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MCQ▾

Question

Iron grills and gates are painted well before rainy season. The reason behind this statement is

Choices

Choice (4) Response

a.

Statement c is the explanation of a and b

b.

Paint acts as a waterproof coating to protect iron from rusting.

c.

Paint is a water proof

d.

Iron undergoes rusting in presence of moisture

Question number: 444

» Metals and Non-Metals

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MCQ▾

Question

Metal used for making the filament in electric bulbs is

Choices

Choice (4) Response

a.

Mercury

b.

Tungsten

c.

Gold

d.

Copper

Question number: 445

» Metals and Non-Metals

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MCQ▾

Question

Normally metals are hard in nature. The metal which can be cut with a knife is

Choices

Choice (4) Response

a.

Copper

b.

Sodium

c.

Cadmium

d.

Aluminium

Question number: 446

» Synthetic Fibres and Plastics

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MCQ▾

Question

Plastic is widely used in place of metals in industry because

Choices

Choice (4) Response

a.

It is non-reactive with almost all chemicals.

b.

It is cheaper than metals

c.

It is more durable than metals

d.

All a. , b. and c. are correct

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