Jannah Theme License is not validated, Go to the theme options page to validate the license, You need a single license for each domain name.
Online TestScience

Light and Sound

Photo of Tnpsctricks Tnpsctricks
0 964 Less than a minute

Light and Sound - 8th Std Science

Congratulations - you have completed Light and Sound - 8th Std Science. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
Reflection from a smooth surface is called ________ reflection.
A
Regular
B
Irregular
C
Multiple
D
Total internal
Question 2
The angle between the incident ray and the normal is called ________
A
Angle of incidence
B
Angle of reflection
Question 3
The bouncing of light from a surface of a body is known as
A
Refraction
B
Total internal reflection
Question 4
The path of light is known as ray it is represented by
A
a straight line
B
Triangle mark
Question 5
When the light rays meet at a point it is
A
Divergent beam
B
Convergent beam
Question 6
If the light rays move away from a point it is called
A
Divergent beam
B
Convergent beam
Question 7
The angle in between reflected ray and the normal drawn from the point of incidence is called
A
Angle of incidence
B
Angle of reflection
Question 8
The principle applied in periscope is
A
Refraction
B
Multiple reflection
Question 9
A swimming pool appears more shallow than its actual depth because of
A
Reflection
B
Refraction
Question 10
When light ray passes from Air to glass it gets.
A
Deviated towards normal
B
Deviated away from normal
Question 11
When light ray passes from glass to Air it gets.
A
Deviated towards normal
B
Deviated away from normal
Question 12
The most comfortable distance the normal eye can read is about
A
25 cm
B
25 mm
Question 13
Sound cannot travel through
A
Air
B
Vacuum
Question 14
The lower end of the tuning Fork is called
A
Scapula
B
Stem
Question 15
The upper end of the tuning Fork is called
A
Scapula
B
Prong
Question 16
The unit of Frequency is
A
Hertz
B
Seconds
Question 17
The unit of amplitude is
A
Hertz
B
Seconds
Question 18
The unit of period is
A
Hertz
B
Seconds
Question 19
Sounds of frequencies lesser than 20 Hz. and greater than 20,000 Hz. are called
A
Audible sounds
B
Inaudible sounds
Question 20
Ultrasonic waves have a frequency of
A
20 Hz
B
Above 20,00 Hz
Question 21
The animal which can hear sound waves above 20,000 Hz is
A
Rat
B
Dog
Question 22
The working principle of a periscope is _________
A
Successive reflection from mirror
B
Successive reflection from two mirrors
Question 23
A fruit appears to be bigger in a glass of water due to _______
A
refraction
B
Refection
Question 24
Sound cannot travel in ________
A
Water
B
Air
C
Vacuum
Question 25
When we touch the rinsing bell we can feel the _________
A
vibrations
B
Thunder
C
Lightening
Question 26
An audible sound has the frequency range of ____
A
20Hz-20,000 Hz
B
10Hz-10,000Hz
Question 27
The bouncing of light from a surface of a body is known as _________
A
Refraction
B
Reflection
Question 28
We are able to see objects because of the phenomenon of _________ of light.
A
reflection
B
refraction
Question 29
Light travels along a ________ line.
A
Cross
B
straight
Question 30
Two or more rays of light form a_________
A
beam
B
Rays
C
Lazer
Question 31
If the rays of light meet at a point, they form a_______ beam.
A
Concave
B
Convergent
Question 32
The perpendicular line drawn to the surface at the point of incidence is called_______
A
normal
B
Abnormal
Question 33
In a rough surface, light is __________ in all directions.
A
Isolated
B
scattered
C
Broken
Question 34
The reflection in a rough surface is _______
A
irregular
B
Regular
Question 35
We need _________ mirrors to see the back of our own head.
A
one
B
two
C
three
Question 36
__________ established thatwhite light consists of seven colours.
A
Newton
B
einstein
C
tesla
Question 37
_________ is the main cause of the brilliance of diamond.
A
Total internal reflection
B
Critical
C
Reflection
Question 38
The most comfortable distance at which one can read with a normal eye is called _______
A
Least distance
B
most distance
Question 39
The convex lens of an eye forms an image of the object on the screen called the _______
A
Iris
B
Retina
C
Cornea
Question 40
Sound needs a _______ for propagation.
A
Fast
B
Medium
C
Slow
Question 41
Sound cannot travel through ______
A
Air
B
Vacuum
C
Pressure
Question 42
_________ helps us to  communicate with one another.
A
Sound
B
Air
C
Heat
Question 43
A to and fro motion of an object is called ______
A
vibration
B
Thunder
C
Lightening
Question 44
The lower end of the tuning fork is called the_______
A
Leafplot
B
stem
C
Steam
Question 45
Human audible range of frequencies is from ________ to ________ Hz.
A
20 to 20,000
B
10 to 10,000
Question 46
Bats use _____ waves for their flight.
A
supersonic
B
ultrasonic
C
Ultrasound
Question 47
Dogs have the ability to hear the sound of frequency higher than ______Hz
A
20,000
B
10,000
Question 48
The ________ sound is called as noise.
A
unpleasant
B
Pleasant
Question 49
An _________ is a device based on the principle of total internal reflection.
A
Copper wire
B
Optical fiber
C
Coaxial Wire
Question 50
Match the following
  1. Irregular reflection         a. Glass slab
  2. Multiple refection            b. Optic fibre
  3. Refraction                            c. Periscope
  4. Total internal reflection    d. Wood
A
2 4 3 1
B
3 4 2 1
C
4 1 2 3
D
1 3 2 4
Question 51
Match the following
  1. Path of light                                    a. regular reflection
  2. Rays meet at a point                      b. diverge
  3. Rays move away from a point        c. irregular reflection
  4. Polished surface                                   d. ray
  5. rough surface                                        e. converge
A
4 3 5 1 2
B
5 3 4 2 1
C
4 2 1 3 5
D
1 5 4 2 3
Question 52
Match the following
  1. Multiple reflection       a. vibration
  2. Dispersion                     b. Hertz
  3. Human eye                 c. Newton
  4. Sound                           d. Kaleidoscope
  5. Frequency                    e. convex lens
A
5 3 2 1 4
B
4 5 2 1 3
C
2 1 3 5 4
D
1 4 3 2 5
Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results
There are 52 questions to complete.

Tags
Photo of Tnpsctricks Tnpsctricks
0 964 Less than a minute
Photo of Tnpsctricks

Tnpsctricks

Leave a Reply

Your email address will not be published. Required fields are marked *

© Copyright 2025, All Rights Reserved  | 
Back to top button
error: Content is protected !!