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Light mcq Class 7. We covered all the Light mcq Class 7 in this post for free so that you can practice well for the exam.
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mcq on Light for Class 7 Students
Which of the following best explains how different colours of white Light travel through the air?
(a) Red Light travels the fastest
(b) Blue Light travels faster than green
(c) All colours in white Light move at the same speed
(d) Yellow Light travels at an average speed between red and violet
Option c – All colours in white Light move at the same speed
Total internal reflection helps explain which of the following?
(a) Mirage formation in deserts and working of optical fibres
(b) Colour of the evening sky and working of optical fibres
(c) Microscope image formation and colour of the sky
(d) Mirage formation and microscope image formation
Option a – Mirage formation in deserts and working of optical fibres
When Light moves from air into glass, which of the following holds true?
(a) Only the frequency remains the same
(b) Only the speed is altered
(c) Both frequency stays constant and speed changes
(d) Neither frequency nor speed changes
Option c – Both frequency stays constant and speed changes
The refractive index of a medium is affected by which of the following?
(a) Nature of the medium and colour of the incoming light
(b) Angle of incidence and colour of the incoming light
(c) Nature of the medium and angle of incidence
(d) Nature of the medium, angle of incidence, and colour of light
Option d – Nature of the medium, angle of incidence, and colour of light
Which statements about hypermetropia are accurate?
(a) Person cannot see distant objects clearly and near point moves further
(b) Person cannot see nearby objects clearly and far point moves closer
(c) Person cannot see distant objects clearly and far point moves closer
(d) Person cannot see nearby objects clearly and near point moves further
Option b – Person cannot see nearby objects clearly and far point moves closer
Consider the following about objects viewed in water:
(a) Both statements about the coin appearing closer and higher are true
(b) Only the coin appears closer when seen from above water
(c) Only the coin appears higher when seen from under water
(d) Neither of the statements is true
Option a – Both statements about the coin appearing closer and higher are true
Which statements are true regarding the properties of light and electromagnetic waves?
(a) Longer wavelengths scatter more and light travels slower in water
(b) Light is faster in water and red light scatters more
(c) Radio waves are generated by fast electrical oscillations and used in speed detection
(d) Light travels faster in water and longer wavelengths scatter more
Option d – Light travels faster in water and longer wavelengths scatter more
What will be the resulting colour when these coloured circles intersect: magenta with yellow, and cyan with magenta?
(a) Red appears in the overlapping area of magenta and yellow only
(b) Blue appears in the overlapping area of cyan and magenta only
(c) Red and blue colours appear in the respective overlapping areas
(d) Neither red nor blue appears in the intersecting regions
Option c – Red and blue colours appear in the respective overlapping areas
What causes the sea to appear blue in colour?
(a) Blue light is refracted by impurities in sea water
(b) Scattering of blue wavelengths by water molecules
(c) Sea water reflects the colour of the blue sky
(d) Water absorbs all other colours except blue
Option a – Blue light is refracted by impurities in sea water
Which one of the following is incorrect?
(a) sound waves in gases are of longitudinal type
(b) Sounds with frequencies under 20 Hz are termed ultrasonic
(c) Higher amplitude sound waves are louder
(d) Higher frequency sound waves are sharper
Option a – sound waves in gases are of longitudinal type
Identify the correct statement(s) about sky colour and scattering:
(a) Clear sky is blue due to weak scattering of blue light
(b) Red light scatters more than blue in the Atmosphere
(c) Without Atmosphere, light wouldn’t scatter, and sky would appear black
(d) All the given statements are valid
Option c – Without Atmosphere, light wouldn’t scatter, and sky would appear black
Which type of radiation in sunlight causes tanning and sunburn?
(a) Ultraviolet rays
(b) Visible light
(c) Infrared radiation
(d) Microwaves
Option a – Ultraviolet rays
What happens to a red light Diffraction pattern when it’s replaced with blue light?
(a) Bands are no longer visible
(b) The pattern expands and the bands spread apart
(c) The pattern narrows and the bands move closer
(d) No noticeable change occurs
Option c – The pattern narrows and the bands move closer
Choose the incorrect statement among the following:
(a) Light from the sun reaches Earth in about 8 minutes and 20 seconds
(b) A convex lens magnifies an object placed between its focus and optical centre
(c) A convex lens reduces the size of an object placed between its focus and optical centre
(d) Persistence of vision is used in cinematography
Option c – A convex lens reduces the size of an object placed between its focus and optical centre
Where should an object be placed in front of a concave mirror to form an image of equal size?
(a) At 15 cm from the mirror
(b) At 30 cm from the mirror
(c) Between 15 cm and 30 cm
(d) Beyond 30 cm
Option b – At 30 cm from the mirror
Under what condition does a concave mirror create an image larger than the object?
(a) When placed at a distance equal to the mirror’s radius of curvature
(b) When the object is within the focal length
(c) When between the focus and centre of curvature
(d) When the object is beyond the radius of curvature
Option c – When between the focus and centre of curvature
Which of the following about lenses is correct?
(a) A convex lens with power 4 dioptres has a focal length of 0.25 m
(b) A convex lens with power -4 dioptres has a focal length of 0.25 m
(c) A concave lens with power 4 dioptres has a focal length of 0.25 m
(d) A concave lens with power -4 dioptres has a focal length of 0.25 m
Option a – A convex lens with power 4 dioptres has a focal length of 0.25 m
A 10 mm long pin is placed vertically in front of a concave mirror. A 5 mm image appears 30 cm in front of it. What is the focal length?
(a) -30 cm
(b) -20 cm
(c) -40 cm
(d) -60 cm
Option b – -20 cm
A child sees her head larger, midsection same size, and legs smaller in a magic mirror. What combination explains this?
(a) Plane at top, convex in middle, concave at bottom
(b) Convex at top, concave in middle, plane at bottom
(c) Concave at top, plane in middle, convex at bottom
(d) Convex at top, plane in middle, concave at bottom
Option c – Concave at top, plane in middle, convex at bottom
Why does a CD in sunlight display rainbow-like colours?
(a) Due to reflection and Diffraction
(b) Due to reflection and transmission
(c) Due to Diffraction and transmission
(d) Due to refraction, Diffraction, and transmission
Option d – Due to refraction, Diffraction, and transmission
Which of the following are true regarding sound and its transmission?
(a) Only the speed of sound is greater in Solids
(b) Talking on the moon isn’t possible and sound doesn’t travel in vacuum
(c) No sound on moon and sound travels faster in Solids
(d) All statements about sound are correct
Option d – All statements about sound are correct
What phenomena contribute to the formation of a rainbow?
(a) Reflection, refraction, and dispersion
(b) Refraction, dispersion, and total internal reflection
(c) Refraction, dispersion, and internal reflection
(d) Dispersion, scattering, and total internal reflection
Option c – Refraction, dispersion, and internal reflection
Which of the following applies to electromagnetic, sound, and water waves?
(a) They all reflect, carry energy, and exert pressure
(b) Only carry energy and travel through vacuum
(c) Reflect and exert pressure
(d) Only reflection is common to all
Option a – They all reflect, carry energy, and exert pressure
In a compound microscope, how does light travel?
(a) Condenser → Objective lens → Eyepiece → Body tube
(b) Objective lens → Condenser → Body tube → Eyepiece
(c) Condenser → Objective lens → Body tube → Eyepiece
(d) Eyepiece → Objective lens → Body tube → Mirror
Option c – Condenser → Objective lens → Body tube → Eyepiece
A student finds the blackboard text blurry from the back of the classroom but clear from the front. What condition might they have?
(a) Hypermetropia
(b) Myopia
(c) Presbyopia
(d) Astigmatism
Option b – Myopia
Why does a swimming pool appear shallower than its actual depth?
(a) Due to light refraction
(b) Due to light reflection
(c) Because of light dispersion
(d) None of the above
Option a – Due to light refraction
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