This page contains cbse class 8 sound questions along with their answers. We also have notes for this chapter that can be ascessed through links given below Sound notes
Fill in the blanks
Loudness of sound depend on …………….
Sound absorbing materials are required in auditoria to avoid ……………
The property of sound that is used by animals to find their way and locate their food is………..
The two kinds of sounds we cannot hear are ……………. And ………….
……………… of any kind is the principle source of production of sound.
…………… instrument used in the laboratory to produce sound of a fixed frequency.
Sound needs a …………….. medium for propagation.
The vibrations of a simple pendulum are also known as ……………….
A soft board will………………… most of the sound falling on it.
The number of vibrations completed in one second is known as ………….
……………. Is proportional to the square of amplitude.
If the thickness of the vibrating string is increased its pitch ………………
Speed of sound highest in …………… medium.
The range of audible frequency for the human ear is……………
Noise is produced by……………..
Answer
Amplitude
Noise pollution
Echo
Infrasonic and Ultrasonic
Vibrations
Tuning fork
Material
Oscillations
Absorb
frequency
Loudness
Decrease
solid
20Hz to 20,000Hz
Irregular and non-periodic vibrations
Match the column
A.
Answer
B.
Answer
C.
Answer
True and False Questions
1.Sound cannot travel in Vaccum
2. Human can hear sound with frequencies 20 Hz to 2000 Hz
3. The pitch of the sound depends on the frequency of the waves
4. SONAR stands for Sound Navigation and Ranging
5. The unpleasant sounds is called noise
6. Sound travels fastest in Solid medium
7. The sound having frequency more than 20,000 Hz is called ultrasound
8. Speed of sound is same as speed of light
1. The vibrating part in a veena is
(a) Stretched string
(b) Stretched Membrane
(c) Air column
(d) None of these
2. A list of mediums is given below.
(i) Iron
(ii) Lemon juice
(iii) air
(iv) vacuum
In which of these mediums can sound travel?
(a) i & ii only
(b) i, ii & iii only
(c) iii & iv only
(d) ii, iii & iv only
3. Large amplitude of sound vibrations will produce
(a) Meak sound
(b) Loud Sound
(c) Slow sound
(d) Shreak
4. A simple pendulum makes 10 oscillations in 20 seconds.A list of statement are generated with the help of these information'
(i) Time period of oscillations is 2 sec
(ii) Frequency of oscillation is .1 hz
which of the following is correct
(a) (i) only
(b) (ii) only
(c) (i) and (ii) both
(d) Both are incorrect
5. Pitch of the sound does not depend on
(a) Frequency of the sound
(b) Time period of the sound
(c) Upon the amount of energy received by the ear
(d) All the above
6. which of the following is correct
(a)Sound can travel in space
(b)Larynx is also known as voice box
(c)Human can hear sound of every frequency
(d) None of these
7. In order to reduce the loudness of a sound we have to
(a) decrease its frequency of vibration of the sound.
(b) increase its frequency of vibration of the sound.
(c) decrease its amplitude of vibration of the sound.
(d) increase its amplitude of vibration of the sound.
8. Sound propagates maximum in
(a) Gas
(b) Liquid
(c) Solid
(d) All
Answer
1.a
2.b
3.a
4.a
5.c
6.b
7.c
8.c
JUMBLED WORD
Answer
a. AMPLITUDE
b. OSCILLATION
c. SHRILLNESS
d. LARYNX
e. EARDRUM
Crossword
Across
3. The loudness of sound is measured in ____ .
5. Unpleasant sounds are called _____
6. Bats use the principle of ____ to avoid hitting against obstacles in their path.
7. The number of oscillations or vibrations per second is called the _____ of oscillation Down
1. The frequency is expressed in ____
2. Sound at frequencies of above 20,000Hz
4. Low frequency sounds which cannot be hear are called _____.
Answer
1.hertz
2.ultrasonics
3.decibels
4.infrasonics
5.noise
6.echolocation
7. frequency
Summary
This Sound Class 8 Questions and answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail. You can also find the pdf download for this in below link
