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Class 10

Explore popular questions from The Human Eye and the Colourful World for Class 10. This collection covers The Human Eye and the Colourful World previous year Class 10 questions hand picked by experienced teachers.

The Human Eye and the Colourful World

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Q 1. In a prism:

rays deviate towards the base of the prism.

B

rays deviate away from the base of the prism.

C

rays are reflected internally toward the vertex of the prism.

D

rays are diffracted around the prism.

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Q 2. Dispersion is:

A

bending of light toward the normal when it enters from a rarer medium to denser medium.

splitting of light into its component colours when it passes through a prism.

C

redistribution of energy of a beam of light when it passes through a slit.

D

bending of light around an obstacle when the size of the obstacle is comparable to the wavelength of the light.

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Q 3. The transparent membrane over the eye ball is called :

A

iris

cornea

C

pupil

D

retina

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Q 4. The muscles which control the thickness of the eye lens are called:

A

tendon muscles

ciliary muscles

C

bone narrow muscles

D

optic muscles

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Q 5. What control the amount of light entering into the inner part of the eye?

Iris

B

Pupil

C

Cornea

D

Lens

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Q 6. The image formed by an astronomical telescope is :

A

bigger than the actual size of the object.

smaller than the actual size of the object.

C

double the size of the object.

D

none of the above.

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Q 7. Which colour suffers the least deviation when it passes through a prism?

A

yellow

red

C

violet

D

green

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Q 8. When monochromatic light is passed through a prism it is :

A

dispersed

B

polarised

C

diffracted

deviated

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Q 9. In an eye the focal length of the eye is changed by

A

pupil

B

iris

ciliary muscles

D

retina

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Q 10. The least distance of distinct vision for a young adult with normal vision is

A

25 m

B

2.5 cm

25 cm

D

2.5 m

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Q 11. Twinkling of stars is visible when the stars are .

near the horizon

B

overhead

C

any where

D

no definite situation

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Q 12. For an eye lens, its focal length is :

A

Fixed

B

reducable

C

increasable

both reduceable & increasable

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Q 13. Eye defect at old age is called :

A

myopia

B

hypermetropia

presbyopia

D

astigmatism

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Q 14. {tex}\mathrm{Assertion}{/tex}: Sky appear blue.
{tex}\mathrm{Reason}{/tex}: The intensity of scattered light , 1 {tex}\alpha{/tex} {tex} \frac{1}{\lambda^4}{/tex}

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 15. {tex}\mathrm{Assertion}{/tex}: The angle of minimum deviation produced by a prism is different for different wavelengths.
{tex}\mathrm{ Reason}{/tex}: {tex}\delta{/tex} = A({tex}\mu-1{/tex}), where {tex}\delta{/tex} is the deviation produced

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 16. {tex}\mathrm{Assertion}{/tex}: A rainbow is formed in the sky on a rainy day.
{tex}\mathrm{Reason}{/tex}: Rainbow is formed due to the dispersion of sun rays, when they fall on the suspended tiny droplets of water.

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 17. {tex}\mathrm{Assertion}{/tex}: The blue colour is used as danger signal
{tex}\mathrm{Reason}{/tex}: Blue colour is scattered through a small amount due to its longer wavelength than all the colour present in visible region.

A

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

Assertion is false but Reason is true

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Q 18.

A

A - P

B

B - R

C

C - Q

D - Q

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Q 19. Angle of deviation in a prism is the angle between .

A

reflected and refracted rays.

B

incident of reflected rays.

incident & transmitted rays.

D

reflected and transmitted rays.

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Q 20. According to tyndall effect, the colour or wave length of the scattered light depends upon the size of the scattering particle.

A

False

B

Only if particles are stationary

True

D

Only if the light undergoes refraction.

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Q 21. To increase the angular magnification of a simple microscope, one should increase.

A

the focal length of the lens

the power of the lens

C

the aperature of the lens

D

the object size

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Q 22. When we see an object, the image formed on the retina is :

A

real

B

inverted

C

crect

Both A and B

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Q 23. A ray of light travelling from medium 1 into medium 2. If medium 1 is optically denser than medium 2, then which of the following statements is/are correct-

A

Speed of light is higher in medium 1 than medium 2

B

Absolute refractive index of medium 1 is higher than medium 2

C

A ray of light bends towards the normal when it travels from medium 2 into medium 1

Both B and C

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Q 24. Which of the following statements about Bi-focal lens is/are correct ?

A

The upper portion consists of a convex lens

B

The lower part is a convex lens

C

The upper part is a concave lens

Both B and C

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Q 25. Rainbow is produced when sunlight falls on drops of rain. Which of the physical phenomena is/are responsible for this ?

A

Refraction

B

Dispersion

C

Total internal reflection

All of the above