CBSE Class-8 Science: Questions 420 - 427 of 469

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Question number: 420

» Light » Visually Challenged Human » Braille System

MCQ▾

Question

One of the best known and widely used aids by the visually challenged is the:

Choices

Choice (4) Response

a.

Regular Reflection

b.

Incident ray

c.

Braille System

d.

All of the above

Question number: 421

» Light » Visually Challenged Human » Non-Optical Aids and Optical Aids

MCQ▾

Question

Optical aids include:

Choices

Choice (4) Response

a.

Tinted lenses

b.

Bifocal lenses

c.

Contact lenses

d.

All a. , b. and c. are correct

Question number: 422

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

MCQ▾

Question

A ray which strikes the reflecting surface is called as:

Choices

Choice (4) Response

a.

Incident ray

b.

Normal

c.

Reflected ray

d.

None of the above

Question number: 423

» Light » Sunlight » Dispersion of Light

MCQ▾

Question

Sunlight is a composition of:

Choices

Choice (4) Response

a.

Seven colour

b.

Only white light

c.

Five colour

d.

All of the above

Question number: 424

» Light » Human Eye » Structure of Human Eye

MCQ▾

Question

Size of the Pupil varies with the help of:

Choices

Choice (4) Response

a.

Retina

b.

Cornea

c.

Ciliary muscles

d.

Iris

Question number: 425

» Light » Types of Reflection » Regular Reflection

MCQ▾

Question

Reflection of light from a smooth surface is called as:

Choices

Choice (4) Response

a.

Regular reflection

b.

Specular reflection

c.

Diffuse reflection

d.

Both a. and b. are correct

Question number: 426

» Light » Types of Reflection » Diffused Reflection

MCQ▾

Question

Diffuse reflection is defined as:

Choices

Choice (4) Response

a.

Reflection from any smooth surface

b.

Reflection from any rough surface

c.

Irregular reflection

d.

Both b. and c. are correct

Question number: 427

» Light » Human Eye » Care of Eyes

MCQ▾

Question

You can cure for your eye by putting on protective eyewear whenever

Choices

Choice (4) Response

a.

You play sports

b.

When you are doing projects in the science labs

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

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