Light MCQ for Competitive Exams. We covered all the Light MCQ for Competitive Exams in this post for free so that you can practice well for the exam.
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MCQ on Light for Competitive Exams
The position, relative size and nature of the image formed by a concave lens for an object placed at infinity are respectively
(a) at focus, diminished and virtual
(b) at focus, diminished and real
(c) between focus and optical centre, diminished and virtual
(d) between focus and optical centre, magnified and real
Option a – at focus, diminished and virtual
The upper and lower portions in a common type of bi-focal lenses are respectively
(a) concave and convex
(b) convex and concave
(c) both concave of different focal lengths
(d) both convex of different focal lengths
Option a – concave and convex
In the phenomenon of dispersion of light, the light wave of the shortest wavelength is
(a) accelerated and refracted the most
(b) slowed down and refracted the most
(c) accelerated and refracted the least
(d) slowed down and refracted the least
Option a – accelerated and refracted the most
Wavelengths of which of the following colour of the visible spectrum of light are maximally absorbed by green plants?
(a) Green and Yellow
(b) Red and Blue
(c) Green and Red
(d) Blue and Yellow
Option b – Red and Blue
Consider the following statements 1. A person with myopia can see distant objects distinctly but cannot see nearby objects clearly. 2. A person with hypermetropia cannot see distant objects clearly. 3. A person with presbyopia can see nearby objects without corrective glasses. Which of the statements given above is/are not correct?
(a) 1, 2 and 3
(b) 1 and 2
(c) 1 and 3
(d) Only 3
Option a – 1, 2 and 3
Which one of the following statements is not correct?
(a) The longest wavelength of the light visible human eye is about 700 mm
(b) The shortest wavelength of light visible to the human eye is about 400 mm
(c) The wavelength of gamma rays is longer than that of X-rays
(d) The ability of a telescope to form a separable image of close objects is called its resolving power
Option c – The wavelength of gamma rays is longer than that of X-rays
If the image of an object, formed by a concave mirror is virtual, erect and magnified, then the object is placed
(a) the principal focus
(b) at the centre of curvature
(c) beyond the centre of curvature
(d) between the pole of the mirror and the principal focus
Option d – between the pole of the mirror and the principal focus
The dispersion process forms a spectrum due to white light on the prism. The light wave with the shortest wavelength falls a
(a) refracts the most
(b) does not change the path
(c) refracts the least
(d) is reflected by the side of the prism
Option a – refracts the most
A ray of white light strikes the surface of an object. If all the colours are reflected the surface would appear
(a) black
(b) white
(c) grey
(d) opaque
Option b – white
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
(a) -30 cm
(b) – 20 cm
(c) – 40 cm
(d) – 60 cm
Option b – – 20 cm
The angle of incidence i and refraction r are equal in a transparent slab when the value of i is
(a) 0º
(b) 45°
(c) 90°
(d) depends on the material of the slab
Option a – 0º
The refractive index of a transparent medium is greater than one because
(a) Speed of light in vacuum
(b) speed of light in a transparent medium
(c) Speed flight in vacuum=speed of light in a transparent medium
(d) Frequency of light wave changes when it moves from rarer to denser medium
Option b – speed of light in a transparent medium
You are given three media A, B and C of refractive index 1.33, 1.65 and 1.46. The medium in which the light will travel fastest is
(a) A
(b) B
(c) C
(d) equal in all three media
Option b – B
Light from the Sun falling on a convex lens will converge at a point called
(a) centre of curvature
(b) focus
(c) the radius of curvature
(d) optical centre
Option b – focus
Which of the following statements is/are true?
(a) A convex lens has 4 dioptre power having a focal length of 0.25 m
(b) A convex lens has -4 dioptre power having a focal length of 0.25 m
(c) A concave lens has 4 dioptre power having a focal length of 0.25 m
(d) A concave lens has – 4 dioptres having a focal 0.25 m
Option a – A convex lens has 4 dioptre power having a focal length of 0.25 m
Magnification produced by a rearview mirror fitted in vehicles
(a) is less than one
(b) is more than one
(c) is equal to one
(d) can be more than or less than one depending upon the position of the object in front of it.
Option a – is less than one
As the sunlight passes through the atmosphere, the rays are scattered by tiny particles of dust, pollen, soot and other minute particulate matter present there. However, when we look up, the sky appears blue during mid-day because
(a) blue light is scattered most
(b) blue light is absorbed most
(c) blue light is reflected most
(d) ultraviolet and yellow components of sunlight combine
Option a – blue light is scattered most
A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?
(a) The lens is concave and has a focal length of 0.5 metres
(b) The lens is convex and has a focal length of 2.0 metre
(c) The lens is convex and has a focal length of 0.5 metres
(d) The lens is concave and has a focal length of 2.0 metre
Option c – The lens is convex and has a focal length of 0.5 metres
Which of the following lenses will bend the light rays through the largest angle?
(a) A lens with power +2.0 D
(b) Lens with power +2.5 D
(c) Lens with power-1.5 D
(d) Lens with power-2.0 D
Option b – Lens with power +2.5 D
The nature of the image formed by a concave mirror when the object is placed between the focus (F) and centre of curvature (C) of the mirror observed by us is
(a) real, inverted and diminished
(b) virtual, erect and smaller in size
(c) real, inverted and enlarged
(d) virtual, upright and enlarged
Option c – real, inverted and enlarged
The nature of the image formed by a convex mirror when the object’s distance from the mirror is less than the distance between the pole and focal point (F) of the mirror would be
(a) real, inverted and diminished in size
(b) real, inverted and enlarged in size
(c) virtual, upright and diminished in size
(d) virtual, upright and enlarged in size
Option c – virtual, upright and diminished in size
If a man’s face is 25 cm in front of a concave shaving mirror producing an erect image 1.5 times the size of his face, the focal length of the mirror would be
(a) 75 cm
(b) 25 cm
(c) 15 cm
(d) 60 cm
Option a – 75 cm
As light travels from a rarer to a denser medium it will have
(a) increased velocity
(b) decreased velocity
(c) decreased wavelength
(d) both (b) and (c)
Option d – both (b) and (c)
Which of the following statements is NOT correct regarding the travel of sound waves?
(a) Sound waves can travel through water
(b) Sound waves can travel through the air
(c) Sound waves can travel through steel
(d) Sound waves can travel through a vacuum
Option d – Sound waves can travel through a vacuum
Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become
(a) double
(b) half
(c) four times
(d) one fourth
Option b – half
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