Light (CBSE (Central Board of Secondary Education- Board Exam) Class-8 Science): Questions 14 - 19 of 37

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Question number: 14

» 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: 15

» 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

Question number: 16

» Light » Human Eye » Care of Eyes

MCQ▾

Question

Insufficient light causes

Choices

Choice (4) Response

a.

Eye dis order

b.

Headache

c.

Eyestrain

d.

All of the above

Question number: 17

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

MCQ▾

Question

Non-optical aids include:

Choices

Choice (4) Response

a.

Auditory aids

AND

Electronic aids

b.

Visual aids

c.

Touch or tactual aids

d.

All a. , b. and c. are correct

Question number: 18

» Light » Sunlight » Composition of Sunlight

MCQ▾

Question

Dispersion is defined as:

Choices

Choice (4) Response

a.

Splitting of light into its constituent colours

b.

Right left reversal of image by a plane mirror

c.

No of reflections taking place together

d.

None of the above

Question number: 19

» 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.

Question does not provide sufficient data or is vague

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