CBSE Class-8 Science: Questions 408 - 413 of 469

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Question number: 408

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

MCQ▾

Question

Water which is suitable for drinking is called as:

Choices

Choice (4) Response

a.

Chlorinated water

b.

Impure water

c.

Boiled water

d.

Potable water

Question number: 409

» Pollution of Air and Water » Water Pollution » Prevention of Water Pollution

MCQ▾

Question

Water pollution can be reduced by:

Choices

Choice (4) Response

a.

Use environmentally friendly household products

AND

Apply natural pesticides and fertilizers

b.

Dispose of toxic products with care

AND

Use of less water

c.

Don’t litter

d.

All a. , b. and c. are correct

Question number: 410

» Light » Human Eye » Care of Eyes

MCQ▾

Question

Staring a computer screen for a long time can:

Choices

Choice (4) Response

a.

Use suitable spectacles

b.

Strain your eyes

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question number: 411

» Light » Concept of Light » What Makes Things Visible

MCQ▾

Question

What makes thing visible:

Choices

Choice (4) Response

a.

In presence of light

b.

In the dark

c.

Only when light reflected by an object enters our eyes

d.

Eyes

Question number: 412

» Light » Human Eye » Functioning of Human Eye

MCQ▾

Question

Persistence of vision is defined as:

Choices

Choice (4) Response

a.

Ability of the eye to change the focal length of the eye lens

b.

Nerve endings which are sensitive to bright light

c.

Nerve endings which are sensitive to dim light

d.

Ability of an eye to continue to see an image for a short duration evenafter the removal of the object

Question number: 413

» Light » Human Eye » Structure of Human Eye

MCQ▾

Question

Most sensitive part of the human eye is:

Choices

Choice (4) Response

a.

Iris

b.

Cornea

c.

Optic nerve fibres

d.

Eye lens

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