WBBSE Solutions For Class 8 School Science Chapter 1 Physical Environment Light Review Questions

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Chapter-1 Physical Environment Review Questions MCQs

Question 1. In the case of a virtual image formed by a plane mirror, the distance between the object and the mirror is

  1. Greater than the distance between the image and the mirror
  2. Same as the distance between the image and the mirror
  3. Less than the distance between the image and the mirror
  4. Twice the distance between the image and the mirror.

Answer: 2. Same as the distance between the image and the mirror

Question 2. The screen used in the cinema hall should be

  1. White and smooth
  2. White and rough
  3. Colored and smooth
  4. Black and rough

Answer: 2. White and rough

3. If the distance between the object and the mirror is reduced by 2 cm, the distance between the object and its image will be reduced by

  1. 4 Cm
  2. 2 Cm
  3. Ocm
  4. None of these

Answer: 1. 4 Cm

Question 4. The drop of water on an arum leaf glitters due to

  1. Reflection of light
  2. Total internal reflection of light
  3. Refraction of light
  4. Absorption of light

Answer: 2. Total internal reflection of light

Read And Learn More WBBSE Solutions For Class 8 School Science Review Questions

Question 5. The image formed by the magnifying glass is

  1. Real
  2. Virtual
  3. Inverted
  4. Hazy

Answer: 1. Real

Question 6. The velocity of light in an optically denser medium is

  1. Greater than the velocity of light in an optically rarer medium
  2. Less than the velocity of light in an optically rarer medium
  3. Same as the velocity of light in an optically rarer medium
  4. None of these

Answer: 2. Greater than the velocity of light in an optically rarer medium

WBBSE Class 8 Light review questions

Question 7. During total internal reflection, the angle of incidence is

  1. Greater than the critical angle
  2. Less than the critical angle
  3. Same as the critical angle
  4. Does not depend upon the critical angle

Answer: 1. Less than the critical angle

WBBSE Solutions For Class 8 School Science Chapter 1 Physical Environment Light Review Questions

Question 8. If the angle between the two plane mirrors is 30°, and if an object is placed in between them, the number of images formed is

  1. 12
  2. 13
  3. 11
  4. Infinite

Answer: 3. 11

Question 9. When a ray of light is incident on a plane mirror, the angle of incidence for which the angle between the incident ray and reflected ray will be 90° is

  1. 45°
  2. 30°
  3. 15°
  4. 60°

Answer: 1. 45°

Question 10. The letter which will not suffer lateral inversion when placed in front of a plane mirror is

  1. M
  2. P
  3. S
  4. B

Answer: 1. M

Question 11. For which color of light, the refractive index will be minimum?

  1. Green
  2. Red
  3. Violet
  4. Indigo

Answer: 2. Red

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Question 12. The critical angle of the diamond with respect to air is

  1. 2.42°
  2. 24.2°
  3. 2.45°
  4. 24.5°

Answer: 2. 24.2°

Question 13. Two boys are standing in front of a plane mirror as shown. When boy looks into the mirror, how far away from him will the image of boy b appear to be?

  1. 6M
  2. 8M
  3. 2M
  4. 10M

Answer: 4. 10M

Question 14. The refractive index depends upon

  1. Color of a ray of light
  2. The critical angle between the two media
  3. Nature of the two media
  4. Both color of a ray of light and the nature of the two media.

Answer: 4. Both color of a ray of light and the nature of the two media.

Question 15. When a ray of light travels from an optically rarer medium to an optically denser medium, the ray in the denser medium

  1. Moves away from the normal
  2. Grazes along the surface of separation of the two media
  3. Moves towards the normal
  4. Suffers total internal reflection

Answer: 3. Moves toward the normal

Chapter-1 Physical Environment Fill in the Blanks

Question 1. A ________image can be cast on screen.
Answer: Real

Question 2. The velocity of light in glass is ________ than the velocity of light in vacuum.
Answer: Less

Question 3. An image of the sun formed by a magnifying glass is a ________ image.
Answer: Real

Question 4. An image formed by a plane mirror is a ________ image.
Answer: Virtual

Question 5. When refraction occurs between ________ and a certain medium, then the refractive index of the medium is called Absolute Refractive Index.
Answer: Vaccum

Question 6. In the case of an image formed by a plane mirror, the distance between the object and the mirror is ________ as the distance between the image and the mirror.
Answer: Same

Question 7. When passing from an optically ________ medium to an optically medium, the refracted ray moves away from the
normal drawn at the surface of separation between the two media.
Answer: Denser, rarer

Question 8. When passing from an optically ________medium to an optically medium, the refracted ray moves closer to the normal drawn at the surface of separation between the two media.
Answer: Greater

Question 9. In the case of total internal reflection, the light must be incident at an angle ________than the critical angle.
Answer: Dense

WBBSE Chapter 1 light review questions and answers

Question 10. In the case of total internal reflection, the light must travel from an optically ________medium to an optically medium.
Answer: Dense, rarer

Question 11. In the periscope, each mirror makes an angle of ________ with the axis of the periscope box.
Answer: 45°

Question 12. In a kaleidoscope, the three mirrors are joined together facing each other in a shape resembling a ________
Answer: Prism

Chapter 1 Physical Environment Identify As ‘True Or ‘False’

Question 1. A virtual image cannot be cast on a screen.
Answer: True

Question 2. The virtual image is formed by a plane mirror.
Answer: True

Question 3. If the angle between two plane mirrors is 45° and if an object is placed between them then 8 images will be formed.
Answer: False

Question 4. A drop of water on the arum leaf glitters due to the total internal reflection of light.
Answer: True

Question 5. In the case of total internal reflection of light, no part of it is absorbed or refracted.
Answer: True

Question 6. The higher the density of a medium higher will be its optical density.
Answer: False

Question 7. When a ray of light passes from an optically denser medium to an optically rarer medium, the refracted light moves away from the normal.
Answer: True

Question 8. The velocity of light is lower in an optically rarer medium.
Answer: False

Question 9. In the case of total internal reflection, the angle of incidence of the ray of light must be smaller than the critical angle.
Answer: False

Question 10. The critical angle of the diamond with respect to air is low.
Answer: True

Question 11. Periscope is used to view a magnified image of an object.
Answer: False

Light concepts summary and review questions for Class 8

Question 12. Lateral inversion occurs when an image is formed by a plane mirror.
Answer: True

Question 13. Kaleidoscope utilizes the property of formation of multiple images by three or more mirrors.
Answer: True

Question 14. Light is a form of energy.
Answer: True

Question 15. Mirage is a virtual image.
Answer: True

Question 16. The refractive index of a medium has no unit.
Answer: True

Chapter 1 Physical Environment Match The Columns

1.

Column -A Column – B
A. Mirage 1. Real image
B. Magnifying glass 2. Total internal reflection
C. Plane mirror 3. Cinema screen
D. Real image 4. Virtual image

Answer: A-2,B-1,C-4,D-3

2.

Column – A Column-B 
A. Brightness of diamond 1. Lateral inversion
B. The glittering of water on arum leaf 2. Multiple image of a single object
C. The image formed by a plane mirror 3. Refraction of light only through a few planes
D. kaleidoscopes 4. Total internal reflection

Answer: A-3,B-4,C-1,D-2

 

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