CBSE Class-8 Science: Questions 389 - 395 of 469

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Question number: 389

» Pollution of Air and Water » Water Pollution » Water Treatment Plant

MCQ▾

Question

Water treatment process can be categorized as:

Choices

Choice (4) Response
a.

Domestic water treatment

b.

Industrial water treatment

c. Both a. and b. are correct
d. Question does not provide sufficient data or is vague

Question number: 390

» Light » Reflections » Reflected Light Can Be Reflected Again

MCQ▾

Question

Periscope is defined as:

Choices

Choice (4) Response
a.

Right-left reversal of image by a plane mirror

b.

An instrument used to see above obstacles

c.

An arrangement in which beautiful patterns are formed

d. All of the above

Question number: 391

» Pollution of Air and Water » Air Pollution » How Does Air Get Polluted?

MCQ▾

Question

Green House Gases are:

Choices

Choice (4) Response
a.

Water Vapours, Methane

b.

Carbon dioxide, nitrogen oxide

c.

Ozone

d. All a. , b. and c. are correct

Question number: 392

» Pollution of Air and Water » Air Pollution » How Does Air Get Polluted?

MCQ▾

Question

Increasing levels of Green House gases like Co2 are leading to:

Choices

Choice (4) Response
a.

Air Pollution

b.

Global warming

c.

Green House effect

d. All of the above

Question number: 393

» Pollution of Air and Water » Air Pollution » CFCs

MCQ▾

Question

Pollutant used in refrigerators, air conditioners and aerosol sprays is

Choices

Choice (4) Response
a.

Oxides of nitrogen

b.

Methane

c.

CFC’s

d. All of the above

Question number: 394

» Light » Concept of Light » Reflection

MCQ▾

Question

The bouncing back of the light after striking a polished surface is called as:

Choices

Choice (4) Response
a.

Reflected ray

b.

Reflection of light

c.

Incident ray

d. Question does not provide sufficient data or is vague

Question number: 395

» Pollution of Air and Water » Air Pollution » How Does Air Get Polluted?

MCQ▾

Question

Green House gases create

Choices

Choice (4) Response
a.

Acid rain

b.

Pollution

c.

Green House effect

d. All of the above

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