Learn Science Sound, Class 8 Science Sound Exercise, Free Online Sound Lessons

Class 8 Science Study Material

An Educational platform for Preparation and Practice Class 8. Kidsfront provide unique pattern of learning Science with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Science for Class 8. This study material help Class 8, Science students in learning every aspect of Sound. Students can understand Sound concept easily and consolidate their learning by doing Online Practice Tests on Science,Sound chapter repeatedly till they excel in Class 8, Sound. Free ONLINE PRACTICE TESTS on Class 8, Sound comprise of Hundreds of Questions on Sound, prepared by the highly professionals team. Every repeat test of Sound will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Sound. Attempt ONLINE TEST on Class 8,Science,Sound in Academics section after completing this Sound Question Answer Exercise.

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Topic wise:Sound preparation in the form of QUESTION & ANSWER.
Evaluate preparation by doing ONLINE TEST of Class 8, Science,Sound.
Review performance in PRACTICE TEST and do further learning on weak areas.
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Evaluate your progress by doing ONLINE MOCK TEST of Class 8, Science, All TOPICS.

Sound

The audible range of frequency for human ear is

a) Less than 20 Hz.
b) 20 to 20 kHz.
c) More than 20 kHz.
d) More than 30 kHz.

✔Answer

✔Solution

Correct Answer Is : 20 to 20 kHz.

Solution Is : Human ear cannot hear a sound below 20 vibrations per second and above 20,000 vibrations per second. Thus, the audible range of human ear is 20 Hz to 20 kHz.

Bats and dolphins can hear sounds of frequency

a) Upto 120 Hz and 150 Hz respectively.
b) Upto 1,200 Hz and 1,500 Hz respectively.
c) Upto 12,000 Hz and 15,000 Hz respectively.
d) Upto 1,00,000 Hz and 1,50,000 Hz respectively.

✔Answer

✔Solution

Correct Answer Is : Upto 1,200 Hz and 1,500 Hz respectively.

Solution Is : Bats and dolphins can hear sound of frequency more than 20,000 Hz, i.e., ultrasonic sounds. Bats can hear sounds of frequency approximately ranging from 1000 Hz to 1,00,000 Hz and dolphins can hear sounds of frequency upto 1,50,000 Hz.

Shrillness of a sound is determined by the

a) Frequency of vibration.
b) Amplitude of vibration.
c) Time period.
d) Loudness

✔Answer

✔Solution

Correct Answer Is : Frequency of vibration.

Solution Is : Shrillness or pitch depends on the frequency of the vibration producing sound. If the frequency of vibration is higher, then the sound produced is shrill and is of high pitch and if the frequency of vibration is lower, then the sound produced is dull and is of lower pitch

Vibrating part of the tabla is

a) Stretched membrane.
b) Stretched string.
c) Air column.
d) Water column.

✔Answer

✔Solution

Correct Answer Is : Stretched membrane.

Solution Is : Tabla is a percussion instrument. Tabla has stretched membrane, which vibrates on beating and produces sound.

Frequency is measured in

a) Hertz.
b) Seconds.
c) Metres.
d) Centimetres.

✔Answer

✔Solution

Correct Answer Is : Hertz.

Solution Is : The number of to and fro movements or the number of oscillations per second is called the frequency of oscillation. Frequency is expressed in `hertz` which is denoted by the symbol Hz, according to the International System of Units(SI) which is accepted uniformly worldwide for general purpose and is in scientific context.

Vibrating part of the sitar is

a) Stretched membrane.
b) Stretched string
c) Air column.
d) Water column.

✔Answer

✔Solution

Correct Answer Is : Stretched string

Solution Is : Sitar is a stringed instrument. Sound is produced due to the vibrations in the strings or metal wires. By varying the length of the wire which is vibrating, the frequency of the produced sound due to the vibrations is varied.

The vibrating part of the flute is the

a) Stretched membrane.
b) Stretched string.
c) Air column
d) Water column.

✔Answer

✔Solution

Correct Answer Is : Air column

Solution Is : Flute is a wind instrument. The tube of the flute has air inside it. When we play the flute, by closing the different holes, the air column is disturbed (vibrated). This produces the musical sound.

The vibrating part of the jaltarang is

a) Stretched membrane.
b) Stretched string.
c) Air column.
d) Water column

✔Answer

✔Solution

Correct Answer Is : Water column

Solution Is : Some bowls having different levels of water are struck by the wooden stick one after the other. On striking, sounds of different pitches are produced due to the vibration of water in the bowls. Highest pitch is produced in the bowl with maximum water and lowest pitch is produced in the bowl with minimum water.

Waves of frequency greater than 20,000 Hz are called as

a) Supersonic.
b) Ultrasonic.
c) Sonic.
d) Infrasonic.

✔Answer

✔Solution

Correct Answer Is : Ultrasonic.

Solution Is : The range between 20 Hz to 20,000 Hz, constitutes the audible range of human ear. So, waves of frequency greater than 20,000 Hz are called as ultrasonic waves as `ultra` means greater. Dogs have the ability to hear sound of frequency greater than 20,000 Hz.

A low-pitched sound is of a

a) Men.
b) Women.
c) Girl child.
d) Boy child

✔Answer

✔Solution

Correct Answer Is : Men.

Solution Is : Frequency determines the pitch or shrillness of the sound. The women and children (girl child or boy child)have short vocal cords than men. This is the reason that the frequency of sound produced by women and children is higher than the frequency of sound produced by men. Thus, the pitch of men is lower as compared to women and children.

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Class 8 Science Study Material

Sound

The audible range of frequency for human ear is

Correct Answer Is : 20 to 20 kHz.

Solution Is : Human ear cannot hear a sound below 20 vibrations per second and above 20,000 vibrations per second. Thus, the audible range of human ear is 20 Hz to 20 kHz.

Bats and dolphins can hear sounds of frequency

Correct Answer Is : Upto 1,200 Hz and 1,500 Hz respectively.

Solution Is : Bats and dolphins can hear sound of frequency more than 20,000 Hz, i.e., ultrasonic sounds. Bats can hear sounds of frequency approximately ranging from 1000 Hz to 1,00,000 Hz and dolphins can hear sounds of frequency upto 1,50,000 Hz.

Shrillness of a sound is determined by the

Correct Answer Is : Frequency of vibration.

Solution Is : Shrillness or pitch depends on the frequency of the vibration producing sound. If the frequency of vibration is higher, then the sound produced is shrill and is of high pitch and if the frequency of vibration is lower, then the sound produced is dull and is of lower pitch

Vibrating part of the tabla is

Correct Answer Is : Stretched membrane.

Solution Is : Tabla is a percussion instrument. Tabla has stretched membrane, which vibrates on beating and produces sound.

Frequency is measured in

Correct Answer Is : Hertz.

Vibrating part of the sitar is

Correct Answer Is : Stretched string

Solution Is : Sitar is a stringed instrument. Sound is produced due to the vibrations in the strings or metal wires. By varying the length of the wire which is vibrating, the frequency of the produced sound due to the vibrations is varied.

The vibrating part of the flute is the

Correct Answer Is : Air column

Solution Is : Flute is a wind instrument. The tube of the flute has air inside it. When we play the flute, by closing the different holes, the air column is disturbed (vibrated). This produces the musical sound.

The vibrating part of the jaltarang is

Correct Answer Is : Water column

Waves of frequency greater than 20,000 Hz are called as

Correct Answer Is : Ultrasonic.

Solution Is : The range between 20 Hz to 20,000 Hz, constitutes the audible range of human ear. So, waves of frequency greater than 20,000 Hz are called as ultrasonic waves as `ultra` means greater. Dogs have the ability to hear sound of frequency greater than 20,000 Hz.

A low-pitched sound is of a

Correct Answer Is : Men.

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