CBSE Class-8 Science: Questions 402 - 407 of 469

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Question number: 402

» Light » Types of Reflection » Diffused Reflection

MCQ▾

Question

Diffuse reflection is defined as:

Choices

Choice (4) Response

a.

Reflection from any smooth surface

b.

Irregular reflection

c.

Reflection from any rough surface

d.

Both b. and c. are correct

Question number: 403

» Light » Reflections » Multiple Images

MCQ▾

Question

A Number of reflections taking place together are called as:

Choices

Choice (4) Response

a.

Multiple reflections

b.

Lateral inversion

c.

Dispersion

d.

Question does not provide sufficient data or is vague

Question number: 404

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

MCQ▾

Question

The angle between the normal and incident ray is called as:

Choices

Choice (4) Response

a.

Angle of incidence

b.

Perpendicular

c.

Angle of reflection

d.

Question does not provide sufficient data or is vague

Question number: 405

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

MCQ▾

Question

The substances which contaminate the air are called as:

Choices

Choice (4) Response

a.

Air pollutants

b.

Dust particles, Smoke and carbon monoxide

c.

Volcanic activities

d.

Methane, Radon gas

Question number: 406

» Pollution of Air and Water » Air Pollution » Smog

MCQ▾

Question

Smog is the combination of the:

Choices

Choice (4) Response

a.

Smoke and fog

b.

Smoke and carbon monoxide

c.

Rain mixed with sulphur dioxide and nitrogen dioxide

d.

Pollution caused by chemicals

Question number: 407

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

MCQ▾

Question

Efforts made to reduce pollution from mobile sources include:

Choices

Choice (4) Response

a.

Using smokeless sources of energy

AND

Plantation of new trees

b.

Use of electrostatic precipitator

c.

Automobiles use should be lessened

d.

All a. , b. and c. are correct

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