Chemistry [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 78 - 85 of 208

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Question 78

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Question

MCQ▾

Which mixture out of the following appears clear and transparent?

Choices

Choice (4)Response

a.

Sugar and water

b.

Starch and water

c.

Sand and water

d.

Chalk powder and water

Question 79

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Question

MCQ▾

Fog is a colloidal system of________.

Choices

Choice (4)Response

a.

A gas in liquid

b.

A gas in gas

c.

A gas in solid

d.

A liquid in gas

Question 80

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Question

MCQ▾

The presence of colloidal particles of dust in air imparts blue colour to the sky. This is due to ________.

Choices

Choice (4)Response

a.

Reflection of light

b.

Absorption of light

c.

Scattering of light

d.

Question does not provide sufficient data or is vague

Question 81

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Question

MCQ▾

Tyndall effect on colloidal solution is due to________.

Choices

Choice (4)Response

a.

Polarization of light

b.

Reflection of light

c.

Scattering of light

d.

None of the above

Question 82

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Question

MCQ▾

The number of moles present in 5 grams of is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 83

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Question

MCQ▾

What is the weight of 16 gram atoms of sulphur?

Choices

Choice (4)Response

a.

b.

c.

400g

d.

Question 84

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Question

MCQ▾

How much weight does litre of at . have?

Choices

Choice (4)Response

a.

10g

b.

15g

c.

d.

22.4g

Question 85

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Question

MCQ▾

How many gram atoms are present in magnesium?

Choices

Choice (4)Response

a.

4

b.

1

c.

2

d.

3