Quiz Science Physics Light: Reflection and Refraction

 MCQ Physics question and Answer:-  light chapter 

Q.1. A light ray traveling obliquely from denser medium to rarer medium.

(a)bend toward the normal

(b)Bend away from the normal

(c)does deviate from its path

(d)none of these 

Ans- B

 

Q.2. Total internal reflection can occur when light tends pass from.

(a) A denser to a rarer medium

(b) A rarer to a denser medium

(c) One medium to another of equal refractive index

(d)none of these 

Ans- A

Total internal reflection takes place only when:

• Light should passes  from denser medium to rare medium
•  The angle of incidence must be greater than a critical angle

Q.3. Mirage is observed in a desert due to the phenomenon of

(a) Interference

(b) Scattering

(c) Total internal reflection TIR

(d) Double refraction

Ans- C

  

Consequences and applications of total internal reflection:

• Mirage in desert and looming
• A crack in a glass vessel often shine like a mirror
• A piece of diamond sparkles when viewed from a certain direction
• Shining if air bubble in water
• Optical fiber
  

 Q.4. A well-cut diamond appear bright because:

(a) Of reflection of light

(b) Of dispersion of light

(c) Of the total internal reflection

(d) Of refraction of light

Ans- C

Q.5. The splitting of white light into seven colours on passing through a glass prism  due to :

 (a) Refraction of light

 (b) Reflection of light

 (c)Dispersion of light

 (d)Interference of light

   

Ans- C

 Q.6. Rainbow is caused due to :

 (a) Reflection of sunlight from air particle

 (b) Dispersion of sub ray from water drops

 (c) Interference of light

 (d) Diffraction of sunlight from water drops

   

Ans- B

 Q.7. Rainbow is formed due to a combination of

 (a) Dispersion and total internal reflection

 (b) Refraction and absorption

 (c) Dispersion and Focussing

 (d) Refraction and Svattering

   

Ans- A

 Q.8. Which of the following instrument is used to study dispersion of light:

 

 (a)Microscope

 (b)Photometer

 (c)Telescope

 (d)Spectrometer

   

Ans- D

 Q.9. In the visible spectrum, the colour having the shortest wavelength is :

 (a)Green

 (b) Blue

 (c) Red

 (d) Violet

   

Ans- D

Q.10.  A water tank appears shallower when it is viewed from the top due to

 (a)Rectilinear propagation of light

 (b)Refraction of light

 (c)Total internal reflection

 (d)reflection

   

Ans- B

 Application of atmosphere refraction

• An object is a denser medium, appears smaller distance
• Advance sunrise and delay sunset
• Twinkling of star

  Q.11. Rear-view mirror used in a vehicle is a 

 (a)Concave mirror

 (b) Convex mirror

 (c)plane Mirror

 (d) None of these

   

Ans-B

Q.12 Magnification produced by a rearview mirror in vehicles

(a) is less than 1

(b) is equal to 1

(c) is more than 1

(d) can be more than or less than 1 depending on the position of the object in front of it

Ans -A

magnification: it is the ratio of the height of the image to the height of the object

Q.13.What type of mirror is used for the headlight of the car

(a) Spherical concave mirror
(b) Cylindrical mirror
(c) Plane mirror
(d)Parabolic mirror

Ans-D

use of concave mirror

• Vehicles headlight
• Solar furnace
• Saving mirror
• Head mirror use by doctor
• Torches
• Searchlight

Q.14. Focal length of plane mirror

(a) +ive
(b) -iv
(c) infinite

(d) 0


Ans-C

Q.15. The object of the image is formed on the human eye  at its

(a) Cornea

(b) Pupil

(c)  retina

(d) Iris


Ans- D

Q.16. The eyes find the vision of the patient to be 6/12 by this he means that

(a) The person can read the letters of 6 inches from a distance of 12m

(b) The person can read the letters of 12 inches from 6m

(c) The person can read the letters of 6m which the normal eye can read from 12m

(d) The focal length of the eye lens had become half that of the normal eye


Ans-C

Q.17. The least distance of distinct vision of a normal eye of an adult is

(a) 25m
(b) 25mm
(c) 25cm
(d) none of these

Ans-C

Q.18.Dioptre is the unit of

(a) Power of a lens

(b) light intensity

(c) focal length of a lens

(d) sound intensity


Ans-A

 

 

Q.19. The power of lens is +2D then it's focal length

 

(a) 20cm

(b) 25cm

(c) 50cm

(d) 100cm


Ans-C

 

 

 

 

Q.20.Astigmatism for human eye can be removed by using

 

(a) convex lens

(b) concave lens

(c) cylindrical lens

(d) prismatic lens


Ans-C

 

 

 

Q.21. Myopia is due to

 

(a) shortening of eyeball
(b) irregular changes in the focal length of the eye lens

(c)older age
(d) elongation of eyeball

Ans-D

 

 

 

 

Q.22 Which type of lens should use by a hypermetropia

 

 

(a) convex lens

(b) concave lens
(c)  bifocal lens

(d)  cylindrical lens


Ans-A

 

 

 

 

Q.23 Critical angle of light passing from glass to water minimum for

 

 

(a)  red colour

(b)  yellow colour

(c)  green colour

(d)   Violet colour


Ans-D

 

 

Q.24 If a ray of light incident on a plane mirror is such that it makes an angle of 30degree with the mirror, then the angle of reflection is

 

 

(a)  30 degree

(b) 45 degre
(c)  55 degree

(d)  60 degree


Ans-D

 

 

 

Q.25 Lambert's law is related to

 

(a)  reflection

(b)  interference

(c)  refraction

(d)  illumination


Ans-D

 

 

Q.26 Electron microscope was invented by

 

 

(a) Knoll and ruska

(b) leeuwenhock

(c) Robert koch
(d) cps wanson

Ans-A

 

 

 

Q.27 A boy is standing in front of plane mirror at a distance of 4 m from it. what is the distance between the boy and his image?

 

 

(a)  4m

(b)  8m

(c)  4.5m

(d) none of these

Ans-B

 

 

 

Q.28 A simple microscope consist of

 

 

(a) a short focus convex lens

(b) a long focus convex lens
(c) a short focus concave lens
(d) a long focus concave lens

Ans-A

 

 

 

Q.29one can distinguish a telescope from a microscope by observing

 

 

(a) length
(b) colour
(c) size of the lens
(d) length and size of the lens

Ans-D

 

 

Q.30 the  amount of the light reflected depend

 

(a) the nature of the material of the object
(b) nature of the surface
(c) smoothness of the surface
(d) all of the ans correct

Ans-A

 

 

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