Light Chapter MCQ. We covered all the Light Chapter MCQ in this post for free so that you can practice well for the exam.
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MCQ Exam on Light for Students
A person is not able to see near objects clearly, because the
(a) image is formed behind the retina
(b) the focal length of the eye lens is too great
(c) the use of a convex lens has been ignored, though it was advised
(d) All of the above
Option d – All of the above
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(c) is absorbed the most by smoke or fog
(d) moves fastest in the air
Option b – is scattered the least by smoke or fog
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
(a) Dispersion of light
(b) Scattering of light
(c) Total internal reflection of light
(d) Reflection of light from the earth
Option b – Scattering of light
The bluish colour of water in the deep sea is due to
(a) the presence of algae and other plants found in the water
(b) the reflection of the sky in the water
(c) the scattering of light
(d) the absorption of light by the sea
Option c – the scattering of light
The colour of an object is determined by
(a) the colour of light reflected by it
(b) the colour of light absorbed by it
(c) the colour of light incident on it only
(d) None of the above
Option a – the colour of light reflected by it
You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light incident obliquely at the same angle would bend the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Option d – Glycerine
The human eye is one of the most valuable and sensitive organs that
(a) enables us to see the wonderful world and colours around us
(b) can identify objects
(c) is like a camera
(d) All of these
Option d – All of these
Which of the following does not describe the working of the human eye?
(a) The lens system forms an image on a light-sensitive screen called the retina.
(b) Light enters the eye through a thin membrane called the cornea
(c) Rainbow is formed due to the splitting of white light
(d) Iris is a dark muscular diaphragm that controls the size of the pupil for regulating the amount of light entering into the eye
Option c – Rainbow is formed due to the splitting of white light
Light-sensitive cells get activated on
(a) illumination
(b) seeing the different colours
(c) facing opaque objects
(d) receiving messages from the brain
Option a – illumination
Iris contracts the pupil
(a) In bright light
(b) To allow less light to enter
(c) In the darkness
(d) Only (a) and (b)
Option d – Only (a) and (b)
The twinkling of a star is due to
(a) atmospheric refraction of sunlight
(b) atmospheric refraction of starlight
(c) lightening in the sky
(d) none of these
Option b – atmospheric refraction of starlight
The path of light passing through a clear solution is not visible but becomes visible through a colloid
(a) because the light is scattered by relatively larger particles
(b) because the light is getting refracted
(c) because the light is getting refracted as well as reflected
(d) All of these
Option a – because the light is scattered by relatively larger particles
The sky appears blue because
(a) molecules of air and other particles in the atmosphere are smaller than the wavelength of visible light
(b) light of shorter wavelengths at the blue end is scattered than the red light whose wavelength is more than 1.8 times
(c) the scattered blue light enters our eyes
(d) All of these
Option d – All of these
Hypermetropia is also known as far-sightedness because
(a) the person is not able to see clearly the distant objects but can see near objects clearly
(b) the person is able to see clearly distant objects, but not near objects
(c) the person is not able to see clearly the distant or near objects
(d) the person is able to see clearly the distant or near objects
Option b – the person is able to see clearly distant objects, but not near objects
Presbyopia can be corrected by
(a) Using bifocal lenses
(b) Using microscopes
(c) Using binoculars
(d) Using sunglasses
Option a – Using bifocal lenses
The shape of the triangular prism
(a) Makes the emergent ray bend at an angle to the direction of the incident ray
(b) Angle of deviation is the angle between the incident ray produced and the emergent ray produced
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
Dispersion of white light takes place because
(a) different colours of light bend through different angles with the incident ray
(b) the red light bends the least and the violet light bends the most
(c) both (a) and (b)
(d) the refractive index of glass is not uniform in the prism
Option c – Both (a) and (b)
Placement of another identical prism in an inverted position with respect to the first and allowing the colours of the spectrum to pass through it will
(a) change the spectrum into white light
(b) change the spectrum into a black band
(c) keep the spectrum as before
(d) split into more colours
Option a – change the spectrum into white light
Dispersion of light by a glass prism takes place because of
(a) the difference in wavelengths of the constituents of light
(b) the difference in speeds of various constituents of white light.
(c) scattering of light by the surface of the glass prism
(d) only b and a are correct
Option d – only b and a are correct
The clear sky appears blue because ( Light Chapter MCQ )
(a) blue light gets absorbed into the atmosphere
(b) ultraviolet radiations are absorbed in the atmosphere
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere
(d) light of all other colours is scattered more than violet and blue colour lights by the atmosphere
Option c – violet and blue lights get scattered more than lights of all other colours by the atmosphere
We covered all the light chapter mcq above in this post for free so that you can practice well for the exam.
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