Sound
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Production and Propagation of Sound
SubtopicProduction and Propagation of Sound under Sound for Grade 8 CBSE.
Preview questions (no answers)
- 1.
If you scratch one end of a long wooden log, your friend at the other end can hear it. This proves sound travels through:
A.Gases
B.Liquids
C.Solids
D.Vacuum
- 2.
The sound of a school bell travels to our ears through the:
A.Water
B.Wood
C.Air
D.Iron
- 3.
In a toy telephone made of two paper cups and a string, sound travels through the:
A.Air inside the cups
B.String
C.Empty space
D.Light
Download the worksheet for Sound - Production and Propagation of Sound to practice offline. It includes additional chapter-level practice questions.
Sound Produced by Humans: Larynx
SubtopicSound Produced by Humans: Larynx under Sound for Grade 8 CBSE.
Preview questions (no answers)
- 1.
What type of sound is produced when the vocal cords are loose and thick?
A.High pitch
B.Low pitch
C.Screaming
D.No sound
- 2.
Which part of the body acts like the 'bellows' that provide the air stream for speech?
A.The stomach
B.The lungs
C.The throat
D.The mouth
- 3.
If you touch your larynx while humming, the sensation you feel is due to:
A.Air pressure
B.Vibration
C.Muscle growth
D.Heat transfer
Download the worksheet for Sound - Sound Produced by Humans: Larynx to practice offline. It includes additional chapter-level practice questions.
Characteristics of Sound: Amplitude and Frequency
SubtopicCharacteristics of Sound: Amplitude and Frequency under Sound for Grade 8 CBSE.
Preview questions (no answers)
- 1.
To change a feeble sound to a loud sound, we must increase its:
A.Frequency
B.Amplitude
C.Pitch
D.Speed
- 2.
The time period of a vibrating body is seconds. Its frequency is:
A.20 Hz
B.50 Hz
C.100 Hz
D.200 Hz
- 3.
A sound with a high pitch is often described as being:
A.Dull
B.Hoarse
C.Shrill
D.Faint
Download the worksheet for Sound - Characteristics of Sound: Amplitude and Frequency to practice offline. It includes additional chapter-level practice questions.
Audible and Inaudible Sounds
SubtopicAudible and Inaudible Sounds under Sound for Grade 8 CBSE.
Preview questions (no answers)
- 1.
A child can often hear slightly higher frequencies than an elderly person, but the standard lower limit for humans is generally considered to be:
A.B.C.D. - 2.
Which of the following sounds is inaudible due to having a frequency that is too low?
A.Ultrasonic sound
B.Audible sound
C.Infrasonic sound
D.Loud sound
- 3.
If an object vibrates at , the number of vibrations it makes in one second is:
A.1
B.5
C.20
D.50
Download the worksheet for Sound - Audible and Inaudible Sounds to practice offline. It includes additional chapter-level practice questions.
Noise Pollution and Control Measures
SubtopicNoise Pollution and Control Measures under Sound for Grade 8 CBSE.
Preview questions (no answers)
- 1.
If a neighbor is playing loud music late at night, what is the most responsible action to take?
A.Play your own music even louder
B.Politely request them to lower the volume or report to local authorities if it continues
C.Break their music system
D.Do nothing and stay awake all night
- 2.
Which of these is a non-technical way to reduce noise pollution in a community?
A.Installing expensive sound walls
B.Creating awareness about the harmful effects of noise
C.Buying everyone noise-canceling headphones
D.Banning all electronics
- 3.
How can we help people with hearing impairment caused by noise?
A.By shouting at them
B.By providing them with hearing aids
C.By ignoring them
D.By playing louder music
Download the worksheet for Sound - Noise Pollution and Control Measures to practice offline. It includes additional chapter-level practice questions.