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
The bluish colour of water in the deep sea is due to
(a) the presence of algae and other plants found in water
(b) reflection of the sky in the water
(c) scattering of light
(d) absorption of light by the sea
Option c – scattering of light
When light rays enter the eye, most of the refraction occurs at the
(a) crystalline lens
(b) the outer surface of the cornea
(c) iris
(d) pupil
Option b – the outer surface of the cornea
The focal length of the eye lens increases when eye muscles
(a) are relaxed and the lens becomes thinner
(b) contract and the lens becomes thicker
(c) are relaxed and the lens becomes thicker
(d) contract and the lens becomes thinner
Option a – are relaxed and the lens becomes thinner
At noon the sun appears white as
(a) light is least scattered
(b) all the colours of the white light are scattered away
(c) the blue colour is scattered the most
(d) the red colour is scattered the most
Option a – light is least scattered
The twinkling of stars is due to atmospheric
(a) dispersion of light by water droplets
(b) refraction of light by different layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds.
Option b – refraction of light by different layers of varying refractive indices
The clear sky appears blue because
(a) blue light gets absorbed in 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 the 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
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
A magnified real image is formed by a convex lens when the object is at
(a) F
(b) between F and 2F
(c) 2F
(d) only (a) and (b) both
Option d – only (a) and (b) both
A full-length image of a distant tall building can definitely be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as a plane mirror
Option b – a convex mirror
In torches, searchlights and headlights of vehicles the bulb is placed
(a) between the pole and the focus of the reflector
(b) very near to the focus of the reflector
(c) between the focus and centre of curvature of the reflector
(d) at the centre of curvature of the reflector
Option b – very near to the focus of the reflector
A divergent lens will produce
(a) always real image
(b) always virtual image
(c) both real and virtual images
(d) none of these
Option b – always virtual image
When an object moves closer to a convex lens, the image formed by it shifts
(a) away from the lens
(b) towards the lens
(c) first towards and then away from the lens
(d) first away and then towards the lens
Option a – away from the lens
When an object moves closer to a concave e lens the image by it shifts
(a) away from the lens on the same side of the object
(b) toward the lens
(c) away from the lens on the other side of the lens
(d) first towards and then away from the lens
Option b – toward the lens
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
(a) +0.5D
(b) -0.5 D
(c) +0.2 D
(d) -0.2 D
Option b – -0.5 D
The image formed by the concave mirror is real, inverted and of the same size as that of the object. The position of the object should be
(a) at the focus
(b) at the centre of curvature
(c) between the focus and the centre of curvature
(d) beyond the centre of curvature
Option c – between the focus and the centre of curvature
A large number of thin stripes of black paint are made on the surface of a convex lens of focal length 20 cm to catch the image of a white horse. The image will be
(a) a zebra of black stripes
(b) a horse with black stripes
(c) a horse of less brightness
(d) a zebra of less brightness
Option c – a horse of less brightness
An object is placed at a distance of 0.25 m in front of a plane mirror. The distance between the object and the image will be
(a) 0.25m
(b) 1.0m
(c) 0.5m
(d) 0.125m
Option c – 0.5m
The angle of incidence for a ray of light having zero reflection angle is
(a) 0
(b) 30°
(c) 45°
(d) 90°
Option a – 0
For a real object, which of the following can produce a real image?
(a) Plane mirror
(b) Concave mirror
(c) Concave lens
(d) Convex mirror
Option b – Concave mirror
Which of the following mirror is used by a dentist to examine a small cavity?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Combination of a convex and concave mirror
Option c – Concave mirror
An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is
(a) – 30 cm
(b) 30 cm
(c) – 15 cm
(d) +15 cm
Option c – – 15 cm
An object at a distance of+ 15 cm is slowly moved towards the pole of a convex mirror. The image will get
(a) shortened and real
(b) enlarged and real
(c) enlarged and virtual
(d) diminished and virtual
Option d – diminished and virtual
A concave mirror of radius 30 cm is placed in water. It’s the focal length in air and water differs by
(a) 15
(b) 20
(c) 30
(d) 0
Option d – 0
A concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of an object, the position of the object will be at
(a) 25 cm
(b) 40 cm
(c) 10 cm
(d) At infinity
Option c – 10 cm
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