CBSE Class-8 Science: Questions 395 - 401 of 469

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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

Question number: 396

» Pollution of Air and Water » Water Pollution » Ganga Action Plan

MCQ▾

Question

GAP is a:

Choices

Choice (4) Response

a.

Ground water pollution

b.

Ganga action plan

c.

Garbage Action plan

d.

Ground water Action Plan

Question number: 397

» Light » Laws of Reflection » Incident Ray, Reflected Ray

MCQ▾

Question

A reflected ray is:

Choices

Choice (4) Response

a.

A light ray which bounces back into same medium after reflection from reflected surface.

b.

Ray strikes the reflecting surface

c.

Perpendicular line

d.

All of the above

Question number: 398

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

MCQ▾

Question

Water gets polluted due to:

Choices

Choice (4) Response

a.

Direct sources

b.

Indirect sources

c.

Both a. and b. are correct

d.

None of the above

Question number: 399

» Light » Laws of Reflection » Concept of Law of Reflection

MCQ▾

Question

Laws of reflection are:

Choices

Choice (4) Response

a.

The incident ray, the reflected ray and the normal at the point of incidence all lie in the same plane

b.

The angle of incidence (i) is equal to the angle of reflection (r)

c.

Both a. and b. are correct

d.

None of the above

Question number: 400

» Light » Laws of Reflection » Angle of Incidence and Angle of Reflection

MCQ▾

Question

Angle of reflection is defined as:

Choices

Choice (4) Response

a.

The angle which the incident ray makes with the normal

b.

Angle between the incident ray and reflected ray

c.

The angle which reflected ray makes with the normal

d.

Question does not provide sufficient data or is vague

Question number: 401

» Pollution of Air and Water » Air Pollution » What Is Air Pollution

MCQ▾

Question

Air pollution is defined as:

Choices

Choice (4) Response

a.

Addition of unwanted and harmful substances in the air

b.

Contamination of air by impurities

c.

All of the above

d.

None of the above

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