{"id":16384,"date":"2025-11-07T06:56:31","date_gmt":"2025-11-07T06:56:31","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=16384"},"modified":"2025-11-08T08:38:57","modified_gmt":"2025-11-08T08:38:57","slug":"light-top-100-mcqs-with-answer-and-explanation-2","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/11\/07\/light-top-100-mcqs-with-answer-and-explanation-2\/","title":{"rendered":"Light Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. Light travels in \u2014<\/mark><\/strong>
A) Curved line
B) Straight line
C) Zig-zag path
D) Random direction
Answer:<\/strong> B) Straight line
Explanation:<\/strong> Light travels in a straight line in a homogeneous medium. This is known as rectilinear propagation of light.<\/p>\n\n\n\n

2. The speed of light in vacuum is approximately \u2014<\/mark><\/strong>
A) 3\u00d71063 \\times 10^63\u00d7106 m\/s
B) 3\u00d71083 \\times 10^83\u00d7108 m\/s
C) 3\u00d71053 \\times 10^53\u00d7105 m\/s
D) 3\u00d710103 \\times 10^{10}3\u00d71010 m\/s
Answer:<\/strong> B) 3\u00d71083 \\times 10^83\u00d7108 m\/s
Explanation:<\/strong> The speed of light in vacuum (or air approximately) is 2.998\u00d71082.998 \\times 10^82.998\u00d7108 m\/s.<\/p>\n\n\n\n

3. Which phenomenon shows that light travels in a straight line?<\/mark><\/strong>
A) Reflection
B) Refraction
C) Shadow formation
D) Dispersion
Answer:<\/strong> C) Shadow formation
Explanation:<\/strong> The formation of shadows occurs because light travels in straight lines and cannot bend around opaque objects.<\/p>\n\n\n\n

4. The bending of light when it passes from one medium to another is called \u2014<\/mark><\/strong>
A) Reflection
B) Refraction
C) Dispersion
D) Scattering
Answer:<\/strong> B) Refraction
Explanation:<\/strong> Refraction is the change in direction of light when it passes from one medium to another due to change in its speed.<\/p>\n\n\n\n

5. The mirror which gives the widest field of view is \u2014<\/mark><\/strong>
A) Plane mirror
B) Concave mirror
C) Convex mirror
D) Parabolic mirror
Answer:<\/strong> C) Convex mirror
Explanation:<\/strong> Convex mirrors diverge light and give a wide field of view; hence used in vehicles as rear-view mirrors.<\/p>\n\n\n\n

6. The image formed by a plane mirror is \u2014<\/mark><\/strong>
A) Real and inverted
B) Virtual and erect
C) Real and erect
D) Virtual and inverted
Answer:<\/strong> B) Virtual and erect
Explanation:<\/strong> Plane mirrors always form virtual, erect, and laterally inverted images.<\/p>\n\n\n\n

7. The focal length of a plane mirror is \u2014<\/mark><\/strong>
A) Infinite
B) Zero
C) Equal to radius of curvature
D) Half of radius of curvature
Answer:<\/strong> A) Infinite
Explanation:<\/strong> Since a plane mirror has no curvature, its radius of curvature and hence focal length are infinite.<\/p>\n\n\n\n

8. The lens which is thicker at the centre than at the edges is called \u2014<\/mark><\/strong>
A) Concave lens
B) Convex lens
C) Cylindrical lens
D) Plano lens
Answer:<\/strong> B) Convex lens
Explanation:<\/strong> A convex lens converges light rays; it is thicker at the centre and thinner at the edges.<\/p>\n\n\n\n

9. Which type of mirror is used by dentists to see enlarged images of teeth?
<\/mark><\/strong>A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Spherical mirror
Answer:<\/strong> C) Concave mirror
Explanation:<\/strong> Concave mirrors produce a magnified image of nearby objects, hence used by dentists.<\/p>\n\n\n\n

10. The image formed on the retina of the human eye is \u2014<\/mark><\/strong>
A) Real and inverted
B) Virtual and erect
C) Real and erect
D) Virtual and inverted
Answer:<\/strong> A) Real and inverted
Explanation:<\/strong> The eye lens focuses light rays on the retina, forming a real and inverted image.<\/p>\n\n\n\n

11. Which color of light deviates the least in a prism?<\/mark><\/strong>
A) Red
B) Blue
C) Violet
D) Green
Answer:<\/strong> A) Red
Explanation:<\/strong> Red light has the longest wavelength and hence deviates least during dispersion.<\/p>\n\n\n\n

12. The splitting of white light into seven colors is called \u2014<\/mark><\/strong>
A) Reflection
B) Refraction
C) Dispersion
D) Diffraction
Answer:<\/strong> C) Dispersion
Explanation:<\/strong> Dispersion occurs due to the different refractive indices for different wavelengths in a prism.<\/p>\n\n\n\n

13. Which part of the eye controls the amount of light entering it?<\/mark><\/strong>
A) Cornea
B) Lens
C) Iris
D) Retina
Answer:<\/strong> C) Iris
Explanation:<\/strong> The iris adjusts the pupil size to regulate the amount of light entering the eye.<\/p>\n\n\n\n

14. The power of a lens is measured in \u2014<\/mark><\/strong>
A) Watts
B) Meters
C) Diopters
D) Candela
Answer:<\/strong> C) Diopters
Explanation:<\/strong> Lens power (P) = 1 \/ focal length (in meters). Its unit is diopter (D).<\/p>\n\n\n\n

15. The phenomenon responsible for the twinkling of stars is \u2014<\/mark><\/strong>
A) Reflection
B) Refraction of light through air layers
C) Dispersion
D) Diffraction
Answer:<\/strong> B) Refraction of light through air layers
Explanation:<\/strong> The changing air density refracts starlight differently, making stars appear to twinkle.<\/p>\n\n\n\n

16. The color of the sky appears blue due to \u2014<\/mark><\/strong>
A) Reflection
B) Refraction
C) Scattering
D) Absorption
Answer:<\/strong> C) Scattering
Explanation:<\/strong> Blue light is scattered more by air molecules (Rayleigh scattering), giving the sky its blue color.<\/p>\n\n\n\n

17. The instrument used to see distant objects clearly is \u2014<\/mark><\/strong>
A) Microscope
B) Telescope
C) Periscope
D) Binoculars
Answer:<\/strong> B) Telescope
Explanation:<\/strong> Telescopes use lenses or mirrors to collect and magnify light from distant objects.<\/p>\n\n\n\n

18. The phenomenon of reflection from smooth surfaces is called \u2014<\/mark><\/strong>
A) Diffuse reflection
B) Regular reflection
C) Irregular reflection
D) Random reflection
Answer:<\/strong> B) Regular reflection
Explanation:<\/strong> Smooth surfaces reflect light in one direction, causing regular reflection and clear images.<\/p>\n\n\n\n

19. Which type of lens is used to correct myopia (short-sightedness)?<\/strong>
<\/mark>A) Convex lens
B) Concave lens
C) Cylindrical lens
D) Plano lens
Answer:<\/strong> B) Concave lens
Explanation:<\/strong> Concave lenses diverge light rays and help focus them on the retina for myopic eyes.<\/p>\n\n\n\n

20. Which device uses the principle of total internal reflection?<\/strong>
<\/mark>A) Telescope
B) Microscope
C) Optical fiber
D) Camera
Answer:<\/strong> C) Optical fiber
Explanation:<\/strong> Optical fibers transmit light through total internal reflection for communication and medical imaging.<\/p>\n\n\n\n

21. The phenomenon of light bending around obstacles is called \u2014<\/strong>
<\/mark>A) Reflection
B) Refraction
C) Diffraction
D) Dispersion
Answer:<\/strong> C) Diffraction
Explanation:<\/strong> Diffraction is the bending of light waves around the edges of an obstacle or slit.<\/p>\n\n\n\n

22. The speed of light is maximum in \u2014
<\/mark><\/strong>A) Glass
B) Water
C) Air
D) Vacuum
Answer:<\/strong> D) Vacuum
Explanation:<\/strong> Light travels fastest in vacuum since there are no particles to interact with the light.<\/p>\n\n\n\n

23. Which of the following can show total internal reflection?<\/strong>
<\/mark>A) Air to glass
B) Water to air
C) Glass to air
D) Both B and C
Answer:<\/strong> D) Both B and C
Explanation:<\/strong> Total internal reflection occurs when light travels from a denser to a rarer medium (like glass to air or water to air) at an angle greater than the critical angle.<\/p>\n\n\n\n

24. Which mirror is used in vehicle headlights?<\/mark><\/strong>
A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Spherical mirror
Answer:<\/strong> C) Concave mirror
Explanation:<\/strong> Concave mirrors converge light rays to produce a strong, parallel beam, useful for headlights.<\/p>\n\n\n\n

25. The color of an object depends on \u2014<\/mark><\/strong>
A) Its shape
B) Its size
C) The light it reflects
D) The light it absorbs
Answer:<\/strong> C) The light it reflects
Explanation:<\/strong> The color we see is due to the wavelengths of light reflected by the object.<\/p>\n\n\n\n

26. The unit of refractive index is \u2014<\/mark><\/strong>
A) m\/s
B) No unit (dimensionless)
C) Newton
D) Diopter
Answer:<\/strong> B) No unit (dimensionless)
Explanation:<\/strong> Refractive index is a ratio of two speeds of light (in vacuum and in medium), hence it has no unit.<\/p>\n\n\n\n

27. A rainbow is formed due to \u2014<\/mark><\/strong>
A) Reflection
B) Refraction and dispersion
C) Diffraction
D) Polarization
Answer:<\/strong> B) Refraction and dispersion
Explanation:<\/strong> Raindrops act like small prisms, refracting and dispersing sunlight into colors, forming a rainbow.<\/p>\n\n\n\n

28. The mirror formula is \u2014<\/mark><\/strong>
A) 1f=1u\u22121v\\frac{1}{f} = \\frac{1}{u} – \\frac{1}{v}f1\u200b=u1\u200b\u2212v1\u200b
B) 1f=1v+1u\\frac{1}{f} = \\frac{1}{v} + \\frac{1}{u}f1\u200b=v1\u200b+u1\u200b
C) 1u=1v\u22121f\\frac{1}{u} = \\frac{1}{v} – \\frac{1}{f}u1\u200b=v1\u200b\u2212f1\u200b
D) f=uvf = uvf=uv
Answer:<\/strong> B) 1f=1v+1u\\frac{1}{f} = \\frac{1}{v} + \\frac{1}{u}f1\u200b=v1\u200b+u1\u200b
Explanation:<\/strong> The mirror formula relates the focal length (f), image distance (v), and object distance (u).<\/p>\n\n\n\n

29. The lens which is thinner at the center than at the edges is \u2014<\/mark><\/strong>
A) Convex lens
B) Concave lens
C) Cylindrical lens
D) Plano lens
Answer:<\/strong> B) Concave lens
Explanation:<\/strong> Concave lenses diverge light rays and are thinner at the center than at the edges.<\/p>\n\n\n\n

30. Which color of light has the shortest wavelength?<\/mark><\/strong>
A) Red
B) Violet
C) Blue
D) Green
Answer:<\/strong> B) Violet
Explanation:<\/strong> Violet light has the shortest wavelength (~400 nm) and highest frequency among visible light.<\/p>\n\n\n\n

31. The device used to produce parallel rays of light is \u2014<\/mark><\/strong>
A) Lens
B) Mirror
C) Collimator
D) Prism
Answer:<\/strong> C) Collimator
Explanation:<\/strong> A collimator aligns light rays parallel to each other, used in optical instruments.<\/p>\n\n\n\n

32. The refractive index of glass is approximately \u2014<\/mark><\/strong>
A) 1.33
B) 1.44
C) 1.52
D) 1.00
Answer:<\/strong> C) 1.52
Explanation:<\/strong> The refractive index of common crown glass is around 1.52, meaning light slows down in glass.<\/p>\n\n\n\n

33. The image formed by a concave mirror when the object is at the center of curvature is \u2014<\/mark><\/strong>
A) Real, inverted, same size
B) Virtual, erect, magnified
C) Real, erect, smaller
D) Virtual, inverted, smaller
Answer:<\/strong> A) Real, inverted, same size
Explanation:<\/strong> For an object at the center of curvature, the image forms at the same point, real and inverted.<\/p>\n\n\n\n

34. Which phenomenon is used in optical fibers?<\/mark><\/strong>
A) Diffraction
B) Total internal reflection
C) Scattering
D) Refraction
Answer:<\/strong> B) Total internal reflection
Explanation:<\/strong> Light signals travel inside optical fibers through continuous total internal reflection.<\/p>\n\n\n\n

35. The focal length of a lens is +20 cm. The lens is \u2014<\/mark><\/strong>
A) Convex
B) Concave
C) Plano-concave
D) Cylindrical
Answer:<\/strong> A) Convex
Explanation:<\/strong> Positive focal length indicates a converging (convex) lens; concave lenses have negative focal length.<\/p>\n\n\n\n

36. Which of the following is a divergent lens?<\/mark><\/strong>
A) Convex lens
B) Plano-convex lens
C) Concave lens
D) Double convex lens
Answer:<\/strong> C) Concave lens
Explanation:<\/strong> Concave lenses cause parallel rays to diverge, spreading outwards.<\/p>\n\n\n\n

37. Which of the following statements is true about the image formed by convex mirrors?<\/mark><\/strong>
A) Always real
B) Always virtual and erect
C) Sometimes real
D) Sometimes inverted
Answer:<\/strong> B) Always virtual and erect
Explanation:<\/strong> Convex mirrors always form virtual, erect, and diminished images, irrespective of object position.<\/p>\n\n\n\n

38. The apparent bending of a stick partially immersed in water is due to \u2014<\/strong>
<\/mark>A) Reflection
B) Refraction
C) Diffraction
D) Dispersion
Answer:<\/strong> B) Refraction
Explanation:<\/strong> The stick appears bent because light from the submerged part bends as it passes from water to air.<\/p>\n\n\n\n

39. The brightness of light depends on \u2014<\/mark><\/strong>
A) Frequency
B) Amplitude
C) Wavelength
D) Speed
Answer:<\/strong> B) Amplitude
Explanation:<\/strong> The amplitude of a light wave determines its intensity or brightness.<\/p>\n\n\n\n

40. What is the nature of the image formed by a concave mirror when the object is between the focus and the pole?<\/mark><\/strong>
A) Real, inverted, magnified
B) Virtual, erect, magnified
C) Real, erect, same size
D) Virtual, inverted, diminished
Answer:<\/strong> B) Virtual, erect, magnified
Explanation:<\/strong> When the object lies between the focus and pole of a concave mirror, a virtual and magnified image is formed behind the mirror.<\/p>\n\n\n\n

41. The mirror used in solar furnaces is \u2014<\/mark><\/strong>
A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Cylindrical mirror
Answer:<\/strong> C) Concave mirror
Explanation:<\/strong> Concave mirrors focus sunlight at a single point, producing high temperatures for solar furnaces.<\/p>\n\n\n\n

42. Which color has the highest frequency?<\/mark><\/strong>
A) Blue
B) Red
C) Green
D) Violet
Answer:<\/strong> D) Violet
Explanation:<\/strong> Violet has the shortest wavelength and highest frequency in the visible spectrum.<\/p>\n\n\n\n

43. What type of image is formed by a convex lens when the object is between focus and optical center?<\/mark><\/strong>
A) Real and inverted
B) Virtual and erect
C) Real and diminished
D) Real and magnified
Answer:<\/strong> B) Virtual and erect
Explanation:<\/strong> When the object is between focus and the optical center, the convex lens forms a virtual, erect, and magnified image.<\/p>\n\n\n\n

44. The scattering of light by particles in its path is known as \u2014<\/mark><\/strong>
A) Reflection
B) Refraction
C) Scattering
D) Diffraction
Answer:<\/strong> C) Scattering
Explanation:<\/strong> Scattering is the deviation of light caused by dust or air molecules; it explains why the sky looks blue.<\/p>\n\n\n\n

45. The power of a convex lens of focal length 0.5 m is \u2014<\/mark><\/strong>
A) +1 D
B) +2 D
C) +3 D
D) +4 D
Answer:<\/strong> B) +2 D
Explanation:<\/strong> Power P=1\/f=1\/0.5=+2\u2009dioptersP = 1\/f = 1\/0.5 = +2 \\, \\text{diopters}P=1\/f=1\/0.5=+2diopters. Positive sign indicates a convex lens.<\/p>\n\n\n\n

46. The refractive index of a medium depends on \u2014<\/mark><\/strong>
A) Color of light
B) Temperature
C) Nature of medium
D) All of the above
Answer:<\/strong> D) All of the above
Explanation:<\/strong> The refractive index varies with the wavelength (color), temperature, and density of the medium.<\/p>\n\n\n\n

47. The type of image formed by a pinhole camera is \u2014<\/mark><\/strong>
A) Real and inverted
B) Virtual and erect
C) Real and erect
D) Virtual and inverted
Answer:<\/strong> A) Real and inverted
Explanation:<\/strong> A pinhole camera forms a real and inverted image on the screen.<\/p>\n\n\n\n

48. The phenomenon used in the working of periscope is \u2014<\/mark><\/strong>
A) Refraction
B) Total internal reflection
C) Reflection
D) Diffraction
Answer:<\/strong> C) Reflection
Explanation:<\/strong> A periscope uses plane mirrors placed at 45\u00b0 to reflect light twice, allowing observation over obstacles.<\/p>\n\n\n\n

49. What happens to the speed of light when it enters a denser medium?<\/mark><\/strong>
A) Increases
B) Decreases
C) Remains constant
D) Becomes infinite
Answer:<\/strong> B) Decreases
Explanation:<\/strong> Light slows down in denser media due to increased optical density.<\/p>\n\n\n\n

50. The focal length of a concave mirror is \u2014<\/mark><\/strong>
A) Positive
B) Negative
C) Zero
D) Infinite
Answer:<\/strong> B) Negative
Explanation:<\/strong> By sign convention, the focal length of concave mirrors (which converge light) is taken as negative.<\/p>\n\n\n\n

51. The phenomenon of seeing the sun before it rises and after it sets is due to \u2014<\/mark><\/strong>
A) Reflection
B) Refraction
C) Dispersion
D) Scattering
Answer:<\/strong> B) Refraction
Explanation:<\/strong> Atmospheric refraction bends sunlight, making the sun visible even when it is below the horizon.<\/p>\n\n\n\n

52. The ability of the eye to focus on near and distant objects is called \u2014<\/strong>
<\/mark>A) Power of vision
B) Accommodation
C) Convergence
D) Myopia
Answer:<\/strong> B) Accommodation
Explanation:<\/strong> The eye changes the focal length of its lens to view objects at different distances \u2014 this is accommodation.<\/p>\n\n\n\n

53. The unit of luminous intensity is \u2014<\/mark><\/strong>
A) Lux
B) Lumen
C) Candela
D) Joule
Answer:<\/strong> C) Candela
Explanation:<\/strong> The SI unit of luminous intensity (brightness perceived by the eye) is candela (cd).<\/p>\n\n\n\n

54. The critical angle for total internal reflection depends on \u2014<\/mark><\/strong>
A) Angle of incidence
B) Refractive index of medium
C) Wavelength of light
D) Both B and C
Answer:<\/strong> D) Both B and C
Explanation:<\/strong> The critical angle varies with the refractive index and wavelength of the light.<\/p>\n\n\n\n

55. A real image can be obtained on a \u2014<\/mark><\/strong>
A) Plane mirror
B) Screen
C) Eye
D) None of these
Answer:<\/strong> B) Screen
Explanation:<\/strong> Real images are formed by actual intersection of light rays and can be projected onto a screen.<\/p>\n\n\n\n

56. Which type of mirror is used in street lights?<\/mark><\/strong>
A) Convex mirror
B) Concave mirror
C) Plane mirror
D) Parabolic mirror
Answer:<\/strong> D) Parabolic mirror
Explanation:<\/strong> Parabolic mirrors focus light into a powerful beam, making them ideal for streetlights and spotlights.<\/p>\n\n\n\n

57. When white light passes through a prism, which color bends the most?<\/strong>
<\/mark>A) Red
B) Blue
C) Green
D) Violet
Answer:<\/strong> D) Violet
Explanation:<\/strong> Violet light has the shortest wavelength and hence bends (refracts) the most.<\/p>\n\n\n\n

58. A concave mirror forms a virtual image when the object is placed \u2014<\/strong>
<\/mark>A) Beyond the center of curvature
B) At infinity
C) Between the pole and focus
D) At the center of curvature
Answer:<\/strong> C) Between the pole and focus
Explanation:<\/strong> In this position, the concave mirror forms a virtual, erect, and magnified image behind the mirror.<\/p>\n\n\n\n

59. The reflection from rough surfaces is called \u2014<\/strong>
<\/mark>A) Diffused reflection
B) Regular reflection
C) Total reflection
D) Irregular refraction
Answer:<\/strong> A) Diffused reflection
Explanation:<\/strong> Rough surfaces reflect light irregularly, scattering it in many directions \u2014 this is diffused reflection.<\/p>\n\n\n\n

60. The splitting of sunlight into its constituent colors by a prism is an example of \u2014<\/strong>
<\/mark>A) Refraction
B) Dispersion
C) Scattering
D) Diffraction
Answer:<\/strong> B) Dispersion
Explanation:<\/strong> The prism separates white light into seven colors (VIBGYOR) due to different refractive indices for each color.<\/p>\n\n\n\n

81. The mirror used in rear-view mirrors of vehicles is \u2014<\/strong>
<\/mark>A) Plane mirror
B) Concave mirror
C) Convex mirror
D) Cylindrical mirror
Answer:<\/strong> C) Convex mirror
Explanation:<\/strong> Convex mirrors give a wide field of view and always produce virtual, erect, and diminished images.<\/p>\n\n\n\n

82. The image formed by a concave mirror for an object placed at infinity is \u2014
<\/mark><\/strong>A) Real, inverted, and highly diminished
B) Virtual, erect, and magnified
C) Real, erect, and same size
D) Virtual, inverted, and same size
Answer:<\/strong> A) Real, inverted, and highly diminished
Explanation:<\/strong> Parallel rays from infinity converge at the focus, forming a real and highly diminished image.<\/p>\n\n\n\n

83. The focal length of a lens depends on \u2014<\/strong>
<\/mark>A) Shape of the lens
B) Material of the lens
C) Surrounding medium
D) All of the above
Answer:<\/strong> D) All of the above
Explanation:<\/strong> Focal length varies with curvature (shape), refractive index (material), and surrounding medium.<\/p>\n\n\n\n

84. Which lens is used to correct hypermetropia (long-sightedness)?
<\/mark><\/strong>A) Concave lens
B) Convex lens
C) Plano-concave lens
D) Cylindrical lens
Answer:<\/strong> B) Convex lens
Explanation:<\/strong> Hypermetropia is corrected using a convex lens that converges light rays before they enter the eye.<\/p>\n\n\n\n

85. The time taken by light to travel from the Sun to Earth is approximately \u2014<\/strong>
<\/mark>A) 1 minute
B) 8 minutes 20 seconds
C) 15 minutes
D) 24 minutes
Answer:<\/strong> B) 8 minutes 20 seconds
Explanation:<\/strong> Light takes about 500 seconds (~8.3 minutes) to travel 1.496 \u00d7 10\u2078 km from the Sun to Earth.<\/p>\n\n\n\n

86. Which type of mirror is used in searchlights?<\/strong>
<\/mark>A) Convex
B) Concave
C) Plane
D) Parabolic
Answer:<\/strong> B) Concave
Explanation:<\/strong> Concave mirrors produce a strong parallel beam of light when the source is at their focus.<\/p>\n\n\n\n

87. The value of the critical angle for glass-air is approximately \u2014<\/strong>
<\/mark>A) 30\u00b0
B) 42\u00b0
C) 60\u00b0
D) 75\u00b0
Answer:<\/strong> B) 42\u00b0
Explanation:<\/strong> For glass (n \u2248 1.52), the critical angle for total internal reflection is about 42\u00b0.<\/p>\n\n\n\n

88. Which color of light is scattered the most in the atmosphere?<\/strong>
<\/mark>A) Red
B) Yellow
C) Blue
D) Green
Answer:<\/strong> C) Blue
Explanation:<\/strong> Blue light has a shorter wavelength and is scattered more by air molecules (Rayleigh scattering).<\/p>\n\n\n\n

89. The rear-view mirror of a car forms an image which is \u2014<\/strong>
<\/mark>A) Real, inverted, smaller
B) Virtual, erect, smaller
C) Real, erect, larger
D) Virtual, inverted, same size
Answer:<\/strong> B) Virtual, erect, smaller
Explanation:<\/strong> Convex mirrors used in rear-view mirrors always form virtual, erect, and diminished images.<\/p>\n\n\n\n

90. The speed of light in glass is approximately \u2014<\/strong>
<\/mark>A) 3\u00d7108\u2009m\/s3 \\times 10^8 \\, \\text{m\/s}3\u00d7108m\/s
B) 2\u00d7108\u2009m\/s2 \\times 10^8 \\, \\text{m\/s}2\u00d7108m\/s
C) 1.5\u00d7108\u2009m\/s1.5 \\times 10^8 \\, \\text{m\/s}1.5\u00d7108m\/s
D) 1\u00d7108\u2009m\/s1 \\times 10^8 \\, \\text{m\/s}1\u00d7108m\/s
Answer:<\/strong> B) 2\u00d7108\u2009m\/s2 \\times 10^8 \\, \\text{m\/s}2\u00d7108m\/s
Explanation:<\/strong> Due to refraction, the speed of light decreases to about two-thirds of its speed in vacuum when in glass.<\/p>\n\n\n\n

91. Which part of the human eye helps to focus light on the retina?<\/strong>
<\/mark>A) Cornea
B) Pupil
C) Lens
D) Iris
Answer:<\/strong> C) Lens
Explanation:<\/strong> The eye lens adjusts its curvature to focus light rays onto the retina.<\/p>\n\n\n\n

92. Which phenomenon explains the formation of mirages?<\/strong>
<\/mark>A) Reflection
B) Refraction
C) Total internal reflection
D) Diffraction
Answer:<\/strong> C) Total internal reflection
Explanation:<\/strong> Mirages occur due to total internal reflection of light in layers of air with varying densities.<\/p>\n\n\n\n

93. The human eye is most sensitive to which color?<\/strong>
<\/mark>A) Blue
B) Green
C) Red
D) Yellow
Answer:<\/strong> B) Green
Explanation:<\/strong> The human eye is most sensitive to green light (~555 nm) in the visible spectrum.<\/p>\n\n\n\n

94. A simple microscope consists of \u2014<\/strong>
<\/mark>A) One convex lens
B) Two convex lenses
C) One concave lens
D) One concave and one convex lens
Answer:<\/strong> A) One convex lens
Explanation:<\/strong> A simple microscope is made of a single convex lens used to magnify small objects.<\/p>\n\n\n\n

95. The formation of images in a pinhole camera supports which property of light?<\/strong>
<\/mark>A) Diffraction
B) Rectilinear propagation
C) Scattering
D) Reflection
Answer:<\/strong> B) Rectilinear propagation
Explanation:<\/strong> The straight-line travel of light enables the formation of an inverted image in a pinhole camera.<\/p>\n\n\n\n

96. The color of the sky appears red during sunrise and sunset because \u2014<\/strong>
<\/mark>A) Blue light is scattered most
B) Red light is scattered least
C) The atmosphere absorbs red light
D) None of the above
Answer:<\/strong> B) Red light is scattered least
Explanation:<\/strong> During sunrise and sunset, sunlight travels a longer path; blue light is scattered away, leaving red light visible.<\/p>\n\n\n\n

97. The instrument used to measure the refractive index of liquids is \u2014<\/strong>
<\/mark>A) Spectrometer
B) Microscope
C) Refractometer
D) Photometer
Answer:<\/strong> C) Refractometer
Explanation:<\/strong> A refractometer measures the degree to which light is bent (refracted) in a liquid.<\/p>\n\n\n\n

98. The process by which the color of objects appears different in different lights is \u2014<\/strong>
<\/mark>A) Dispersion
B) Selective absorption
C) Reflection
D) Diffraction
Answer:<\/strong> B) Selective absorption
Explanation:<\/strong> Objects absorb certain wavelengths and reflect others; thus, colors appear different under varied lighting.<\/p>\n\n\n\n

99. The color of danger signals is red because \u2014<\/strong>
<\/mark>A) It is most attractive
B) It scatters the least
C) It has the shortest wavelength
D) It travels the slowest
Answer:<\/strong> B) It scatters the least
Explanation:<\/strong> Red light, with the longest wavelength, can travel farther without scattering, making it ideal for warning signs.<\/p>\n\n\n\n

100. The working of the human eye is similar to \u2014<\/strong>
<\/mark>A) Microscope
B) Telescope
C) Camera
D) Prism
Answer:<\/strong> C) Camera
Explanation:<\/strong> The human eye functions like a camera \u2014 the lens focuses light on the retina (film), and the iris controls light entry (aperture).<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Light travels in \u2014A) Curved lineB) Straight lineC) Zig-zag pathD) Random directionAnswer: B) Straight lineExplanation: Light travels in a straight line in a homogeneous medium. This is known as rectilinear propagation of light. 2. The speed of light in vacuum is approximately \u2014A) 3\u00d71063 \\times 10^63\u00d7106 m\/sB) 3\u00d71083 \\times 10^83\u00d7108 m\/sC) 3\u00d71053 \\times 10^53\u00d7105<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[4029,5649,5623],"class_list":{"0":"post-16384","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-physics","7":"tag-mcqs-adda","8":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","9":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/16384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=16384"}],"version-history":[{"count":2,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/16384\/revisions"}],"predecessor-version":[{"id":17618,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/16384\/revisions\/17618"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=16384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=16384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=16384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}