Top Light Science Gk Questions Answers In English For All Competitive Exams. You Will Read The Top Question And Answer Related To Light Science In This Post. This Can Be Asked In Any Competitive Exams, Must Read Once.
Light Science Gk Questions Answers In English
Q1.Diffusion of light in atmosphere is due to?
- Dhukan
- helium
- Carbon Dioxide
- none of the above
Correct Ans: A. Dhulkan
Q2. There are seven colors in light, what is the way of separating the colors?
- colors can be distinguished from plants
- colors cannot be separated
- colors can be separated with a prism
- colors can be separated by filter
Correct Ans: C. colors can be separated with a prism
Q3.Light is made up of tiny particles called?
- positon
- Photons
- atom
- Newton
Correct Ans: B. Photons
Q4.How will a plant with green leaves look when placed in red light?
- black
- red
- green
- purple
Correct Ans: A. Black
Q5.What type of wave is light wave?
- longitudinal wave
- both of the above
- transverse wave
- none of these
Correct Ans: C. Transverse wave
Q6.The color of an opaque object is due to the color it is given to-
- reflects
- isolates
- absorbs
- refers
Correct Ans: A. Reflects
Q7.Wave theory of light was proposed by?
- by Planck
- by Faraday
- by Newton
- by Huygains
Correct Ans: D. by Huygains
Q8.Which of the following color combination is most convenient during day and night?
- Yellow and Blue
- red and green
- orange and blue
- white and black
Correct Ans: B. Red and Green
Q9.Which of the following phenomena helps in deciding that light is a transverse wave?
- polarization
- refraction
- interference
- diffraction
Correct Ans: A. Polarization
Q10.Which of the following color has maximum wavelength?
- green
- red
- blue
- Yellow
Correct Ans: B. red
Q11.Who discovered the electromagnetic nature of light?
- Maxwell
- young
- snail
- Newton
Correct Ans: A. Maxwell
Q12.Which of the following is not a primary colour?
- red
- blue
- green
- Yellow
Correct Ans: D. Yellow
Q13.Who was the first to show that light waves are diffracted?
- Maxwell
- Focault
- Gremaldi
- young
Correct Ans: C. Gremaldi
Q14. The process of separation of white light from its different colors is called?
- diffraction
- character deflection
- scattering
- Display
Correct Ans: B. Character deflection
Q15.Photoelectric effect was rendered?
- H. Hearts
- Newton
- Compton
- Maxwell
Correct Ans: A. H. Hurts
Q16.There are three basic colors-
- blue red green
- blue yellow green
- Green Yellow Red
- blue yellow red
Correct Ans: A. Blue Red Green
Q17.Which of the following phenomenon does not occur in both light and sound?
- reflection
- refraction
- diffraction
- polarization
Correct Ans: D. polarization
Q18.Primary color is-
- Colors of the spectrum of white light
- Colors that cannot be produced by mixing other colors
- colors found in nature
- Colors of the Rainbow
Correct Ans: B. Colors that cannot be produced by mixing other colors
Q19. What is the bending of light from the edge of an obstacle called?
- refraction
- interference
- deflection
- diffraction
Correct Ans: D. Diffraction
Q20.When white light passes through a prism, the character which is less distracted is?
- purple
- Yellow
- red
- green
Correct Ans: C. red
Q21.Which of the following theory confirms the wave nature of light?
- theory of interference
- electromagnetic wave theory of light
- Newton’s particle theory
- none of these
Correct Ans: A. Theory of Interference
Q22.When white light passes through a prism, the character which gets distracted the most is
- Yellow
- sky
- red
- Violet
Correct Ans: D. Violet
Q23. What is the nature of light radiation?
- similar to both wave and particle
- wave and particle are not the same
- like a wave
- like a particle
Correct Ans: A. Similar to both wave and particle
Q24.White light is made up of a combination of how many colours?
- 5
- 7
- 3
- 4
Correct Ans: B. 7
Q25.The phenomenon of light hitting a smooth surface is called?
- diffraction of light
- scattering of light
- refraction of light
- reflection of light
Correct Ans: D. Reflection of Light
Q26. On passing through a prism, the rays of sunlight get split into different colors because-
- Rays are refracted on two surfaces of the prism
- The divergence of rays of different colors is different
- Light rays are electromagnetic waves
- The rays diverge on the two surfaces of the prism
Correct Ans: B. The divergence of rays of different colors is different
Q27.The phenomenon of polarization in light proves that light is waves?
- transverse wave
- longitudinal
- sharp
- progressive
Correct Ans: A. Transverse wave
Q28.The division of different colors of light in a prism is called?
- diffraction of light
- character dispersion of light
- reflection of light
- refraction of light
Correct Ans: B. Character dispersion of light
Q29.Who first found the speed of light?
- romer
- Michaelson
- Galileo
- Newton
Correct Ans: A. Romer
Q30.The power of a convex lens when it is immersed in water-
- increases
- keeps unchanged
- decreases
- none of these
Correct Ans: C. Decreases
Q31.The speed of light is maximum?
- vacuum
- in hydrogen
- diamonds
- in the water
Correct Ans: A. Vacuum
Q32. If the power of a lens of which specs is +2 diopters, then its focal length will be-
- 50 cm.
- 2 cm.
- 200 cm.
- 100 cm.
Correct Ans: A. 50 cm.
Q33.Speed of light with increase in temperature of medium-
- stays the same
- falls down
- grows
- decreases
Correct Ans: A. stays the same
Q34. The focal length of a convex lens is 0.2 m. Its power will be?
- -4D
- +5D
- +2D
- -2D
Correct Ans: B. +5D
Q35. The speed of light in water, glass and diamond is in the following order?
- Glass>Diamond>Water
- diamond>water>glass
- diamond>glass>water
- Water>Glass>Diamond
Correct Ans: D. Water>Glass>Diamond
Q36. The focal length of a lens is 25 cm. His ability will be-
- -2D
- -4D
- +2D
- +4D
Correct Ans: D. +4D
Q37.Approximately how long does light take to travel from the Moon to the Earth?
- 1 second
- 100 seconds
- 8 minutes
- 8 seconds
Correct Ans: A. 1 second
Q38.Sunglasses have power?
- 2diopters
- 4diopters
- 0 diopters
- 1diopter
Correct Ans: C. 0 diopters
Q39.Approximately how long does it take for sunlight to reach the earth?
- 8 minutes
- 4 minutes
- 6 minutes
- 8 seconds
Correct Ans: A. 8 minutes
Q40.Diopter is the unit of what?
- Light Intensity
- of sound intensity
- of lens power
- of the focal length of the lens
Correct Ans: C. of lens power
Q41.The velocity of light is-
- 3 x 10^8 km/sec
- 3 x 10 mile/sec
- 3 x 10^8 cm/sec
- 3 x 10^8 m/sec
Correct Ans: D. 3 x 10^8 m/sec
Q42.Will an air bubble in water act as it does?
- concave mirror
- concave lens
- convex mirror
- convex lens
Correct Ans: B. Concave lens
Q43.Which part of the Sun is visible during a solar eclipse?
- Kirit (Corona)
- sphere of influence
- alphabet
- no part
Correct Ans: A. Kirit (Corona)
Q44.The color of light is determined by-
- intensely
- by speed
- dimensions
- from wavelength
Correct Ans: D. From wavelength
Q45.The maximum time of total solar eclipse is?
- 500 seconds
- 600 seconds
- 250 seconds
- 460 seconds
Correct Ans: D. 460 seconds
Q46.Diverging lens is one which-
- imaginary image is formed
- makes a real image
- spreads rays
- collects rays
Correct Ans: C. Spreads rays
Q47.Solar eclipse occurs when-
- the sun is in the middle
- Sun, Moon and Earth are in one line and Jupiter is not in that line
- the moon is in the middle
- Earth is in the middle
Correct Ans: C. the Moon is in the middle
Q48. A converging lens is one which-
- imaginary image is formed
- makes a real image
- spreads rays
- collects rays
Correct Ans: D. collects rays
Q49. Does lunar eclipse occur?
- crescent days
- new moon and full moon days
- new moon day
- full moon days
Correct Ans: D. Full moon days
Q50. If a person stands between two plane mirrors which are inclined at an angle of 600, then how many images will he see?
- 5
- 6
- 3
- 4
Correct Ans: A. 5
Q51.When does solar eclipse happen?
- any day
- Quarter Moon Days
- new moon
- full moon days
Correct Ans: C. new moon
Q52.What should be the angle between the mirrors when to obtain three images of an object with the help of plane mirrors?
- 90°
- 45°
- 0°
- 60°
Correct Ans: A. 90°
Q53.Why does a cut diamond sparkle?
- due to total internal reflection
- Because of some other inherent property
- Because of its molecular structure
- Causes of Exploitation of Light
Correct Ans: A. Due to total internal reflection
Q54. Two plane mirrors are placed at an angle of 90° and a candle is lit between them. How many images of the candle will be formed in the mirror?
- 4
- eternal
- 2
- 3
Correct Ans: D. 3
Q55.Why does a coin lying in a vessel full of water seem to be raised slightly?
- due to diffraction of light
- due to dispersion of light
- due to reflection of light
- due to refraction of light
Correct Ans: D. Due to refraction of light
Q56.The number of images formed when an object is placed between two parallel mirrors is?
- four
- infinite
- two
- three
Correct Ans: B. infinite
Q57.A person sitting hanging from water see his leg raised and short?
- due to diffraction
- Reason of Dispersion
- causes of refraction
- Reflection Cause
Correct Ans: C. Causes of Refraction
Q58. What is the minimum height of a plane mirror to see the complete image of a person?
- one quarter of a person’s height
- twice the height of the person
- Equal to person’s height
- half of a person’s height
Correct Ans: D. Half of the person’s height
Q59. When a compact disc is seen in sunlight, the colors similar to Indra’s bow appear?
- Based on the phenomenon of diffraction and transit
- Refraction based on the phenomenon of diffraction and transit
- Based on the phenomenon of reflection and diffraction
- Based on the phenomenon of reflection and transit
Correct Ans: C. Based on the phenomenon of reflection and diffraction
Q60. The image formed by the eye of the retina is-
- real, straight, short
- unreal, Inverted, small
- Real, Inverted, Small
- real, upright, big
Correct Ans: C. Real, Inverted, Small
Q61.Why does a fish lying under water appear to be raised slightly above its actual depth?
- due to polarization of light
- due to reflection of light
- due to diffraction of light
- due to refraction of light
Correct Ans: D. Due to refraction of light
Q62.Where is the image of an object formed in the human eye?
- pupil
- retina
- cornea
- Iris
Correct Ans: B. retina
Q63.A stick immersed in water appears to be bent due to what?
- refraction of light
- scattering of light
- reflection of light
- diffraction of light
Correct Ans: A. Refraction of Light
Q64.What do you use to shave a beard?
- flat mirror
- convex mirror
- concave mirror
- none of these
Correct Ans: C. Concave mirror
Q65. When a ray of light passes from a rarer medium to a denser medium, it will-
- bends towards the normal
- deflects away from the normal
- goes straight
- none of these
Correct Ans: A. bends towards the normal
Q66.Which type of mirror is used in the headlights of vehicles?
- concave mirror
- Parabolic Mirror
- flat mirror
- convex mirror
Correct Ans: A. Concave mirror
Q67.What causes a rainbow to form?
- diffraction and refraction
- refraction and reflection
- refraction and dispersion
- Scattering and Refraction
Correct Ans: B. Refraction and Reflection
Q68.The mirror used by dentists to see the teeth of patients is-
- concave
- flat
- convex
- none of these
Correct Ans: A. Concave
Q69.What is the phenomenon known as a mirage?
- polarization
- absolute internal reflection
- adulteration
- diffraction
Correct Ans: B. absolute internal reflection
Q70.Vehicles use what to see the objects coming from behind?
- convex mirror
- concave mirror
- convex lens
- concave lens
Correct Ans: A. Convex mirror
Q71.The technique used for the exploration of the abdomen or other internal organs of the body is endoscopy based?
- on diffraction phenomena
- On Polarization
- On the full internal enforcement phenomenon
- on the phenomenon of interference
Correct Ans: C. On the full internal enforcement phenomenon
Q72.The formation of bright colors in thin soap is the result of which phenomenon?
- refraction and dispersion
- Polarization and Personification
- Forgotten Reflection and Interference
- multiple refraction and dispersion
Correct Ans: C. Forgotten Reflection and Interference
Q73. Why does the bottom of a beaker filled with liquid appear raised?
- diffraction
- reflection
- refraction
- adulteration
Correct Ans: C. Refraction
Q74.Which one is used to make Periscope?
- concave mirror
- plane mirror
- concave lens
- none of these
Correct Ans: B. plane mirror
Q75. Internal reflection of light from the Sun can happen if the light-
- go from glass to air
- go from water to glass
- go from air to glass
- go from air to water
Correct Ans: A. go From glass to air
Q76.Why dry sand appears bright while wet sand is bright?
- The reason for this is refraction
- it’s scatter
- It’s an optical illusion
- this is due to reflection
Correct Ans: D. this is due to reflection
Q77.Glassed glass appears to be glazed?
- causes of interference
- absolute internal reflection
- causes of refraction
- Reflection Cause
Correct Ans: B. absolute Internal Reflection
Q78.Which color of rainbow has more deflection?
- red
- blue
- purple
- Pil
Correct Ans: A. red
Q79.On what principle does optical fiber work?
- adulteration
- absolute internal reflection
- refraction
- scattering
Correct Ans: B. absolute Internal Reflection
Q80.What causes the atmosphere to become red during sunrise and sunset?
- dispersion of light
- scattering of light
- refraction of light
- reflection of light
Correct Ans: B. Scattering of Light