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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
Why does a person struggle to clearly view nearby objects?
(a) The image forms behind the retina
(b) The eye lens has an excessively long focal length
(c) The person didn’t use a convex lens as recommended
(d) All of the above
Option d – All of the above
Why are warning lights on tall buildings typically red?
(a) Red Light gets scattered the most by fog or smoke
(b) Red Light experiences the least scattering in fog or smoke
(c) Red Light is absorbed the most by atmospheric particles
(d) Red Light travels fastest through air
Option b – Red Light experiences the least scattering in fog or smoke
What mainly causes the sun to appear reddish at dawn and dusk?
(a) Dispersion of Light
(b) Scattering of Light
(c) Total internal reflection
(d) Reflection from Earth’s surface
Option b – Scattering of light
What is responsible for the blue appearance of ocean water in deep areas?
(a) Presence of aquatic plants and algae
(b) Reflection of the sky on the surface
(c) Scattering of sunlight
(d) Absorption of light by seawater
Option c – Scattering of sunlight
What factor decides the perceived colour of an object?
(a) The wavelength of light it reflects
(b) The wavelength of light it absorbs
(c) The type of light falling on it
(d) None of these
Option a – The wavelength of light it reflects
A ray of light enters different substances at the same angle. In which will it bend the most?
(a) Kerosene
(b) Water
(c) Mustard oil
(d) Glycerine
Option d – Glycerine
Which of the following best describes the function of the human eye?
(a) Allows us to see the world in all its colours
(b) Helps in recognizing objects
(c) Functions similarly to a camera
(d) All of these
Option d – All of these
Which of the statements below is unrelated to how the human eye functions?
(a) The lens creates an image on the retina
(b) Light enters through the cornea
(c) Rainbows form due to white light splitting
(d) The iris adjusts the pupil to control light entry
Option c – Rainbows form due to white light splitting
When do the light-sensitive cells in the eye become active?
(a) When exposed to light
(b) When they detect different colours
(c) When viewing Solid objects
(d) When they receive signals from the brain
Option a – When exposed to light
In which situation does the iris reduce the size of the pupil?
(a) In the presence of bright light
(b) To reduce the amount of incoming light
(c) In a dark room
(d) Both (a) and (b)
Option d – Both (a) and (b)
What causes stars to appear to twinkle in the night sky?
(a) Sunlight bending in the Atmosphere
(b) Refraction of starlight by Earth’s Atmosphere
(c) Lightning occurring in the sky
(d) None of these
Option b – Refraction of starlight by Earth’s Atmosphere
Why does the beam of light become visible in a colloidal solution but not in a clear solution?
(a) It is scattered by larger particles
(b) It is refracted while passing through
(c) It is both refracted and reflected
(d) All of these
Option a – It is scattered by larger particles
Why is the sky seen as blue during the day?
(a) Air molecules and small particles are smaller than visible light’s wavelength
(b) Shorter wavelengths like blue scatter more than longer wavelengths
(c) Scattered blue light reaches our eyes
(d) All of these
Option d – All of these
Why is hypermetropia commonly referred to as far-sightedness?
(a) Distant objects appear blurry while nearby ones are clear
(b) The person can see distant objects clearly but struggles with nearby ones
(c) Both near and far objects appear blurred
(d) Both near and far objects appear clear
Option b – The person can see distant objects clearly but struggles with nearby ones
What type of lenses are used to correct presbyopia?
(a) Bifocal lenses
(b) Microscopes
(c) Binoculars
(d) Sunglasses
Option a – Bifocal lenses
What happens to light passing through a triangular prism?
(a) It emerges at an angle different from the incident direction
(b) The deviation angle is between the extended incident and emergent rays
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option c – Both (a) and (b)
Why does white light disperse when it passes through a prism?
(a) Each colour bends differently depending on its wavelength
(b) Red bends the least while violet bends the most
(c) Both (a) and (b)
(d) Because the glass has a non-uniform refractive index
Option c – Both (a) and (b)
What happens when a second prism is placed in reverse after a Spectrum is formed?
(a) The Spectrum recombines into white light
(b) The colours turn into a black band
(c) The Spectrum remains unchanged
(d) The light splits into more colours
Option a – The Spectrum recombines into white light
What causes white light to spread into different colours in a prism?
(a) Each colour has a different wavelength
(b) The components of white light travel at different speeds
(c) The light gets scattered by the prism
(d) Both (a) and (b)
Option d – Both (a) and (b)
Why does the sky appear blue under clear daylight conditions?
(a) The Atmosphere absorbs blue light
(b) Ultraviolet rays are absorbed by air molecules
(c) Blue and violet light scatter more than other colours
(d) Other colours scatter more than blue and violet
Option c – Blue and violet light scatter more than other colours
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