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CBSE Class 8 Science Worksheet

Light

1.
Choose the correct option: An optical instrument in which reflected light is reflected again is called _________.
A) telescope B) kaleidoscope C) microscope D) periscope
2.
State True or False: Diffused reflection gives a sharp image.
A) true B) false
3.
Define lateral inversion.
4.
How does the eye change in order to focus on near or distant objects?
A) Eye lens move in or out B) Retina move in or out C) Eye lens becomes thicker or thinner D) Pupil becomes larger or smaller
5.
Choose the correct answer: Which part of our eye is sensitive to the bright light?
A) Rods B) Cones C) Pupil D) Retina
6.
State True or False: LED is a luminous object.
A) true B) false
7.
Fill in the blanks: The angle of reflection for a ray falling normally on a plane mirror is ____________.
8.
Why can owl see very well in the night but not during the day like other animals?
9.
Choose the correct answer: Path of light is _____________________.
A) Staright line B) Curved path C) Converging lines D) None of these
10.
Choose the correct answer: As per the law of reflection, an angle of incidence ___________________.
A) Is greater than angle of incidence B) Is equal to angle of incidence C) Is less than angle of incidence D) None of these
11.
State True or False: If a light ray strikes a surface at a right angle, it is reflected along the same path.
A) true B) false
12.
Fill in the blanks: The size of the ________ is controlled by the iris.
13.
State True or False: Two mirrors inclined to each other give multiple images.
A) true B) false
14.
Choose the correct option: Angle of incidence is equal to the angle of reflection.
A) Never B) Sometimes C) under special conditions D) Always
15.
State two laws of reflection.
16.
Choose the correct answer: When two plane mirrors are placed parallel facing each other, the ray of light is reflected by ____________.
A) One time B) Two times C) Four times D) Infinite times
17.
State True or False: Light travels at different speeds in different medium.
A) true B) false
18.
Choose the correct answer: The idea of forming number of images by mirrors placed at an angle to one another to
make numerous beautiful patterns is used in ______________________.
A) Telescope B) Kaleidoscope C) Microscope D) Periscope
19.
State True or False: In irregular reflection angle of incidence is not equal to the angle of reflection.
A) true B) false
20.
Fill in the blanks: ___________ of human eye are sensitive to dim light.

CBSE Class 8 Science Worksheet

Light

Answers

1.
Option D
2.
Option B

3.
The phenomenon due to which image formed by a plane mirror of the left-hand side of an object appears as the right-hand side of the object and vice versa is called a lateral inversion.
4.
Option C
5.
Option B
6.
Option A

7.
0.0
8.
Because owl has a large cornea and a large pupil to allow more light into the eye. It has a large number of rods on its retina and few cones.
9.
Option A
10.
Option B
11.
Option A

12.
Pupil
13.
Option A
14.
Option D

15.
(i) The angle of incidence is equal to the angle of reflection (ii) Incident rays, reflected rays and normal rays drawn at the point of incidence to the reflecting surface lies in the same plane.
16.
Option D
17.
Option A
18.
Option B
19.
Option B

20.
Rods
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