Match the Column I with Column II. Column I Column II ( a ) Audible frequency range ( i ) More than 20 kHz . ( b ) Normal breathing ( ii ) 20 Hz to 20 kHz ( c ) Ultrasonic waves ( iii ) 10 dB ( d ) Length of vocal cords in man ( iv ) Frequency ( e ) Number of oscillations per second ( v ) 20 mm long

The frequencies of sound which can be heard by the human ear are known as the audible range. It is from 20 Hz to 20 kHz . Column I Column II ( a ) Audible frequency range ( ii ) 20 Hz to 20 kHz The loudness of sound is measured in decibel and it depends on the amplitude of the vibration of a sound-producing object. The loudness of normal breathing is 10 dB . Column I Column II ( b ) Normal breathing ( iii ) 10 dB Sound waves having frequency greater than the highest frequency which can be heard by human ears are known as ultrasonic waves. Column I Column II ( c ) Ultrasonic waves ( i ) More than 20 kHz In humans, the sound is produced by the larynx. The length of the vocal cords present in the larynx determines the quality of sound produced, and its length in man is 20 mm long. Column I Column II ( d ) Length of vocal cords in man ( v ) 20 mm long Frequency is defined as the number of oscillations per second. Its SI unit is hertz. Column I Column II ( a ) Audible frequency range ( ii ) 20 Hz to 20 kHz ( b ) Normal breathing ( iii ) 10 dB ( c ) Ultrasonic waves ( i ) More than 20 kHz ( d ) Length of vocal cords in man ( v ) 20 mm long ( e ) Number of oscillations per second ( iv ) Frequency

Match the Column I with Column II . Column I Column II ( a ) Unit of frequency ( i ) Low shrillness ( b ) Pleasant sound ( i i ) Noise ( c ) Low frequency ( i i i ) Hertz ( d ) Sound ( i v ) Music ( e ) Unwanted sounds ( v ) Vibration of body

Frequency is defined as the number of oscillations per second. Its SI unit is hertz. Column I Column II ( a ) Unit of frequency ( i i i ) Hertz The sound which is pleasant to human ears is known as music. It is produced by the regular vibrations of a sound-producing object. Column I Column II ( b ) Pleasant sound ( i v ) Music Pitch is the characteristic of sound which differentiates two sounds having the same loudness. It is directly proportional to the frequency of vibrations of the sound-producing object. Column I Column II ( c ) Low frequency ( i ) Low shrillness Sound is produced by the vibrations of an object. It is the most common way of communication among human beings. Column I Column II ( d ) Sound ( v ) Vibration of body Sounds which are unpleasant to our ears are known as noise. Excess noise causes noise pollution. Column I Column II ( a ) Unit of frequency ( i i i ) Hertz ( b ) Pleasant sound ( i v ) Music ( c ) Low frequency ( i ) Low shrillness ( d ) Sound ( v ) Vibration of body ( e ) Unwanted sounds ( i i ) Noise

E M B I B E

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice

Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Sound, Exercise 5: Chapter Practice

Author:Arjun Sharma, Seema Mehra & Shikha Sharma

Arjun Sharma Science Solutions for Exercise - Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Sound, Exercise 5: Chapter Practice

Attempt the free practice questions on Chapter 13: Sound, Exercise 5: Chapter Practice with hints and solutions to strengthen your understanding. All in One - SCIENCE CBSE Class 8 solutions are prepared by Experienced Embibe Experts.

Questions from Arjun Sharma, Seema Mehra and, Shikha Sharma Solutions for Chapter: Sound, Exercise 5: Chapter Practice with Hints & Solutions

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 5

The frequency is expressed in metre ( $m$ ).

MEDIUM

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 6

Higher the amplitude of vibration, lesser is the pitch.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 7

Regular vibrations produce musical sounds.

MEDIUM

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 8

Shriller sound has more frequency.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 9

Plantation along roadside can reduce noise pollution.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 10

Man cannot hear the sound of bats.

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 1

Match the Column I with Column II.

Column I	Column II
$(a)$ Audible frequency range	$(i)$ More than $20 kHz$ .
$(b)$ Normal breathing	$(ii) 20 Hz to 20 kHz$
$(c)$ Ultrasonic waves	$(iii) 10 dB$
$(d)$ Length of vocal cords in man	$(iv)$ Frequency
$(e)$ Number of oscillations per second	$(v) 20 mm$ long

EASY

8th CBSE

IMPORTANT

All in One - SCIENCE CBSE Class 8>Chapter 13 - Sound>Chapter Practice>Q 2

Match the Column $I$ with Column $II$ .

Column $I$	Column $II$
$(a)$ Unit of frequency	$(i)$ Low shrillness
$(b)$ Pleasant sound	$(i i)$ Noise
$(c)$ Low frequency	$(i i i)$ Hertz
$(d)$ Sound	$(i v)$ Music
$(e)$ Unwanted sounds	$(v)$ Vibration of body

Learn and Prepare for any exam you want !

|

|

|

|

|

|

|

|