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Light Class 7 mcq. We covered all the Light Class 7 mcq 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
What causes the deep sea water to appear bluish in color?
a) Due to the presence of aquatic plants and algae
b) Because the sky’s reflection is visible on the water surface
c) Due to Light being scattered in the water
d) Because the sea absorbs Light
Option c – Due to Light being scattered in the water
Where does most of the bending of Light occur when it enters the human eye?
a) Crystalline lens
b) Outer layer of the cornea
c) Iris
d) Pupil
Option b – Outer layer of the cornea
When does the eye lens have a longer focal length?
a) When the eye muscles relax and the lens becomes thinner
b) When the eye muscles contract and the lens becomes thicker
c) When the eye muscles relax and the lens thickens
d) When the eye muscles contract and the lens thins
Option a – When the eye muscles relax and the lens becomes thinner
Why does the Sun appear white around noon?
a) Because minimal scattering of Light takes place
b) As all the colors are scattered away
c) Since the blue component is mostly scattered
d) Because the red Light is scattered more
Option a – Because minimal scattering of Light takes place
What causes stars to appear as if they are twinkling?
a) Light dispersion by water droplets in the air
b) Light bending due to atmospheric layers with different densities
c) Scattering of light by dust particles
d) Reflection of light within the clouds
Option b – Light bending due to atmospheric layers with different densities
Why does the sky look blue on a clear day?
a) Because the blue light is absorbed by the Atmosphere
b) As ultraviolet rays are absorbed by the Atmosphere
c) Because violet and blue light scatter more than other colors
d) Since other colors scatter more than violet and blue light
Option c – Because violet and blue light scatter more than other colors
Why are warning lights on tall buildings typically red?
a) Because red light is scattered the most in fog or smoke
b) Since red light experiences the least scattering in fog or smoke
c) As red light is heavily absorbed in smoke or fog
d) Because red light travels the fastest through air
Option b – Since red light experiences the least scattering in fog or smoke
At which position does a convex lens form an enlarged real image?
a) At the focal point
b) Between the focus and twice the focal length
c) At twice the focal length
d) Both (a) and (b)
Option d – Both (a) and (b)
What type of mirror can show the entire image of a distant tall structure?
a) Concave mirror
b) Convex mirror
c) Plane mirror
d) Either concave or plane mirror
Option b – Convex mirror
Where is the bulb placed in devices like torches and headlights?
a) Between the pole and focus of the reflector
b) Very close to the focus of the reflector
c) Between focus and center of curvature
d) At the center of curvature
Option b – Very close to the focus of the reflector
What kind of image does a diverging lens always produce?
a) Real image
b) Virtual image
c) Both real and virtual
d) None of the above
Option b – Virtual image
What happens to the image when an object is brought closer to a convex lens?
a) Image moves away from the lens
b) Image shifts closer to the lens
c) First moves closer then farther
d) First farther then closer
Option a – Image moves away from the lens
What happens to the image when an object approaches a concave lens?
a) Image shifts away on the same side as the object
b) Image moves closer to the lens
c) Image shifts to the other side, away from the lens
d) Initially moves closer then away
Option b – Image moves closer to the lens
A person cannot see objects clearly beyond 2 meters. What lens power can correct this?
a) +0.5 D
b) -0.5 D
c) +0.2 D
d) -0.2 D
Option b – -0.5 D
Where should an object be placed in front of a concave mirror to get a real, inverted image of the same size?
a) At the focal point
b) At the center of curvature
c) Between focus and center of curvature
d) Beyond the center of curvature
Option c – Between focus and center of curvature
What happens if black stripes are drawn on a convex lens used to form an image of a white horse?
a) Image appears as a zebra with black lines
b) Image of the horse with black bands
c) Dimmer image of the horse
d) Zebra image with reduced brightness
Option c – Dimmer image of the horse
An object is placed 0.25 m from a plane mirror. What is the distance between the object and its image?
a) 0.25 m
b) 1.0 m
c) 0.5 m
d) 0.125 m
Option c – 0.5 m
What is the angle of incidence when a light ray is reflected directly back?
a) 0°
b) 30°
c) 45°
d) 90°
Option a – 0°
Which optical surface can produce a real image from a real object?
a) Plane mirror
b) Concave mirror
c) Concave lens
d) Convex mirror
Option b – Concave mirror
Which mirror type does a dentist use to examine cavities?
a) Convex mirror
b) Plane mirror
c) Concave mirror
d) A mix of convex and concave mirrors
Option c – Concave mirror
An object placed 30 cm from a concave mirror forms an image at the same location. What is the mirror’s focal length?
a) -30 cm
b) 30 cm
c) -15 cm
d) +15 cm
Option c – -15 cm
As an object moves closer to a convex mirror from 15 cm away, how does its image behave?
a) Becomes smaller and real
b) Becomes larger and real
c) Enlarges and becomes virtual
d) Shrinks and remains virtual
Option d – Shrinks and remains virtual
How much does the focal length of a concave mirror change in water compared to air?
a) 15
b) 20
c) 30
d) 0
Option d – 0
A concave mirror with a 20 cm focal length creates an image twice as large. Where is the object placed for a virtual image?
a) 25 cm
b) 40 cm
c) 10 cm
d) At infinity
Option c – 10 cm
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