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 statements is correct regarding the propagation of light of different colours of white light in the air?
(a) Red light moves the fastest
(b) Blue light moves faster than green light
(c) All the colours of the white light move with the same speed
(d) Yellow light moves with the mean speed as that of red and the violet light
Option c – All the colours of the white light move with the same speed
Consider the following statement: The principle of total internal reflection is applicable to explain the 1. Formation of mirage in the desert. 2. Formation of the image in the microscope. 3. Colour of the evening sky. 4. Operation of optical fibres. Which of the statement given above are correct?
(a) 1 and 4
(b) 3 and 4
(c) 2 and 3
(d) 1 and 2
Option a – 1 and 4
Which of the following statements is/are true regarding a light wave travelling from air to glass? 1. Its frequency remains unchanged. 2. Its speed changes. Select the correct answer using the codes given below :
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option c – Both 1 and 2
Refractive index of an optical medium changes with 1. the nature of the medium. 2. the change in the angle of incidence of the ray. 3. colour of the incident ray. Select the correct answer using the code given below :
(a) 1 and 3 only
(b) 2 and 3 only
(c) 1 and 2 only
(d) 1, 2 and 3
Option d – 1, 2 and 3
Consider the following statements: Hypermetropia is a defect of vision in which 1. a person cannot see distant objects clearly. 2. a person cannot see near objects clearly. 3. the near point of the eye gets shifted away from the normal position. 4. the far point of the eye gets shifted towards the eye. Which of the statements given above is correct?
(a) 1 and 3
(b) 2 and 4
(c) 1 and 4
(d) 2 and 3
Option d – 2 and 3
Consider the following statements : 1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is. 2. If a person under water looks at a coin above, the water surface, the coin will appear to be at a higher level than it really is. Which of the above statements is/are correct?
(a) Both 1 and 2
(b) 1 alone
(c) 2 alone
(d) Neither 1 nor 2
Option a – Both 1 and 2
Consider the following statements: 1. Light of longer wavelength is scattered much more than the light of shorter wavelength. 2. The speed of visible light in water is 0.95 times the speed in vacuum. 3. Radio waves are produced by rapidly oscillating electrical currents. 4. To detect the overspeeding of vehicles, police use the Doppler effect to reflected short radio waves. Which of these statements are correct?
(a) 1 and 2
(b) 1 and 3
(c) 2 and 4
(d) 3 and 4
Option d – 3 and 4
Consider the following statements : 1. If magenta and yellow-coloured circles intersect, the intersected area will have red colour. 2. If cyan and magenta coloured circles intersect, the intersected area will have blue colour. Which of the statement(s) given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option c – Both 1 and 2
The blue colour of water in the sea. What is the reason behind the phenomenon?
(a) Refraction of the blue light by the impurities in sea water.
(b) Scattering of blue light by water molecules.
(c) Refraction of blue sky by sea water.
(d) Absorption of other colours except the blue colour by water molecules.
Option a – Refraction of the blue light by the impurities in sea water
Which one of the following statements is not correct?
(a) Sounds wave in gases are longitudinal in nature
(b) Sounds wave having frequency below 20 Hz are known as ultrasonic waves
(c) Sounds waves having higher amplitudes are louder
(d) Sound waves with high audible frequencies are sharp
Option a – Sounds wave in gases are longitudinal in nature
Consider the following statements 1. Clear sky appears blue due to poor scattering of blue wavelength of visible light. 2. Red part of light shows more scattering than blue light in the atmosphere. 3. In the absence of atmosphere, there would be no scattering of light and sky will look black. Which of the statements given above is/are correct?
(a) Only 1
(b) 1 and 2
(c) Only 3
(d) All of these
Option c – Only 3
The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called
(a) ultraviolet radiation
(b) visible radiation
(c) infrared radiation
(d) microwave radiation
Option a – ultraviolet radiation
A diffraction pattern is obtained using a beam of red light. Which one among the following will be the outcome, if the red light is replaced by blue light?
(a) Bands disappear
(b) Diffraction pattern becomes broader and further apart
(c) Diffraction pattern becomes narrower and crowded together
(d) No change
Option c – Diffraction pattern becomes narrower and crowded together
Choose the incorrect statement?
(a) Light from sun takes nearly eight minutes 20 seconds to come to earth.
(b) For a convex lens, if the object is placed between the focus and optical centre then the image formed will be magnified
(c) For a convex lens, if the object is placed between the focus and optical centre then the image formed will be diminished
(d) Cinematography makes use of persistence of vision.
Option c – For a convex lens, if the object is placed between the focus and optical centre then the image formed will be diminished
Rays from the sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that the size of its image is equal to the size of the object?
(a) 15 cm in front of the mirror
(b) 30 cm in front of the mirror
(c) between 15 cm and 30 cm in front of the mirror
(d) more than 30 cm in front of the mirror.
Option b – 30 cm in front of the mirror
Under which of the following conditions a concave mirror can form an image larger than the actual object?
(a) When the object is kept at a distance equal to its radius of curvature
(b) When object is kept at a distance less than its focal length
(c) When object is placed between the focus and centre of curvature
(d) When object is kept at a distance greater than its radius of curvature
Option c – When object is placed between the focus and centre of curvature
Which of the following statements is true?
(a) A convex lens has 4 dioptre power having a focal length 0.25 m
(b) A convex lens has – 4 dioptre power having a focal length 0.25 m
(c) A concave lens has 4 dipotre power having a focal length 0.25 m
(d) A concave lens has – 4 dioptre power having a focal length 0.25 m
Option a – A convex lens has 4 dioptre power having a focal length 0.25 m
A 10 mm long awlpin 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
A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her body of the same size and that of the legs smaller. The following is the order of combinations for the magic mirror from the top.
(a) Plane, convex and concave
(b) Convex, concave and plane
(c) Concave, plane and convex
(d) Convex, plane and concave
Option c – Concave, plane and convex
When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of
(a) reflection and diffraction
(b) reflection and transmission
(c) diffraction and transmission
(d) refraction, diffraction and transmission
Option d – refraction, diffraction and transmission
Consider the following statements : 1. Two persons on the surface of moon cannot talk to each other. 2. Sound waves cannot travel through vacuum. 3. Speed of sound is greater in solid medium than in liquid or gas medium.
(a) 3 alone is correct
(b) 1 and 2 are correct
(c) 1 and 3 are correct
(d) 1,2 and 3 are correct
Option d – 1,2 and 3 are correct
Which of the following phenomena of light are involved in the formation of a rainbow? ( Light MCQ Class 7 )
(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 statements about electromagnetic waves, sound waves and water waves is/are correct? 1. They exhibit reflection 2. They carry energy 3. They exert pressure 4. They can travel in vacuum Select the correct answer using the code given below :
(a) 1,2 and 3
(b) 2 and 4
(c) 1 and 3 only
(d) 1 only
Option a – 1,2 and 3
Which one of the following is the correct sequence of passage of light in a compound microscope?
(a) Condenser – Objective lens-Eye-piece – 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 writing on the black board as blurred and unclear when sitting on the last desk in a classroom. However, he sees it clearly when sitting on the front desk. Student suffers from a vision defect known as
(a) hypermetropia
(b) myopia
(c) presbyopia
(d) astigmatism
Option b – myopia
A swimming pool looks shallower than it really is, when seen by a person standing outside near it, because of the phenomenon of
(a) refraction of light
(b) reflection of light
(c) dispersion of light
(d) None of these
Option a – refraction of light
We covered all the light mcq class 7 above in this post for free so that you can practice well for the exam.
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