CBSE Class 8 Science Chapter 13 Light Question And Answers

CBSE Class 8 Science Chapter 13 Light Fill In The Blanks

Question 1. A person 1 m in front of a plane mirror seems to be ________ m away from his image.
Answer: 2

Question 2. If you touch your ________ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with
Answer: left, left hand

Read And Learn More CBSE Class 8 Science Question And Answers

Question 3. The size of the pupil becomes ________ when you see in dim light.
Answer: large

Question 4. Night birds have ________ cones than rods in their eyes.
Answer: lesser

” Light Class 8 Questions “

Question 4. The incident rayi the normal ray and the reflected ray, all lie in the ___________ plane.
Answer: same

Question 5. When the angle between plane mirrors is more than 90°, it forms ___________ images.
Answer: Two

” CBSE Class 8 Science Chapter 13 Question and Answers “

Question 6. ___________ is The transparent part of the outermost layer of eye.
Answer: Comea

Question 1. _____________ reflection takes place from a smooth surface.
Answer: Regular

Question 2. _____________ is the defect in which a person can see nearby object very clearly but cannot see distant objects.
Answer: Myopia

Question 3. The minimum distant at which the eye can see object distinctly is _____________  for a normal person.
Answer:  25 cm

” Reflection of Light Class 8 “

Question 4. The image of an object persists on the retina of an eye for about _____________ second even after the object has disappeared.
Answer: 1/16

Question 5. If the still pictures of a moving object are flashed on our eyes at a rate faster than _____________ pictures per second, the eye perceives the object as moving.
Answer: 16

Question 6. In a movie, the still pictures in proper sequence are projected on the screen usually at the rate of _____________ pictures per second.
Answer: 24

CBSE Class 8 Science Chapter 13 Light True or False

Question 1. Diffused/Irregular reflection takes place from rough surfaces.
Answer: True

Question 2. Diffused reflection gives a sharp image.
Answer: False

Question 3. Two mirrors inclined to each other give multiple images.
Answer: True

Question 4. An eye lens focuses light behind the eye on the cornea.
Answer: False

Question 5. The part of the eye that renders colour to it is the cornea.
Answer: False

Question 6. Cones and rods are the light-sensitive cells.
Answer: True

Question 7. Sunlight, called white light, consists of seven colours.
Answer: True

” Laws of Reflection Class 8 “

Question 8. Visually challenged people can read and write with a hearing aid.
Answer: False

Question 7. The law of reflection is not valid for rough surfaces.
Answer: False

Question 8. Periscope works on the multiple reflection by a plane mirror.
Answer: True

Question 9. Sunlight is a mixture of eight different colours.
Answer: False

CBSE Class 8 Science Chapter 13 Light Match The Columns

 Match Column 1 with Column 2.

Answer: 1. (a)-(2), (b)-(4), (c)-(5), (d)-(3), (e)-(1)

” Human Eye Structure Class 8 “

Assertion-Reason Questions

The following question consists of two statements: Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Question 1. Assertion (A) Irregular surfaces produce diffused reflection.

Reason (R) Due to failure of law of reflection, diffused reflection is produced.

Answer: 3. The law of reflection is followed by every surface but due to irregularities, some surfaces produce diffused reflection. Hence, A is true but R is false.

Question 2. Assertion (A) Night birds have more rods than cones.

Reason (R) Rods are more sensitive for dim light than cones.

Answer: 1. Night birds have more rods than cones because they are designed by nature to see in night. Hence, both A and R are true and R is the correct explanation of A.

” Dispersion of Light into VIBGYOR “

Question 3. Assertion (A) Iris controls the size of lens.

Reason (R) Iris controls the amount of light entering in the eye.

Answer: 4.  Iris controls the size of pupil. Hence, A is false but R is true.

Question 4. Assertion (A) Eye sight becomes foggy in old ages.

Reason (R) Crystalline lens becomes milky and cloudy in old ages.

Answer: 1. Both A and R are true and R is the correct explanation of A.

” Kaleidoscope Working Principle “

Assertion-Reason Questions

The following questions consists of two statementsAssertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.

1. Both A and R arc true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Question 10. Assertion (A) Owl can see very-well In the night.

1. Reason (R) Owl has a large cornea and a large pupil to allow more light in its eye.
2. Answer: 1. Both A and R arc true and R is the correct explanation of A.
3. Question 11. Assertion (A) Rainbow is the natural phenomenon of multiple reflection.
4. Reason (R) Rainbow forms when sunlight falls on the rainwater droplets.

Answer: 4. A is false but R is true.