Sound Quiz - ICSE Class 7 Science
Free practice quiz: Sound (ICSE Class 7 Science). 45 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is the SI unit of frequency?
- Watt
- Decibel
- Hertz
- Volt
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Answer: C. Hertz
Frequency is defined as the number of oscillations or cycles per second. The SI unit for frequency is Hertz (Hz).
A vibrating tuning fork is placed near the surface of water. What would be observed?
- The water level rises
- The water surface ripples
- The water freezes
- The water evaporates
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Answer: B. The water surface ripples
The vibrations of the tuning fork are transmitted to the water molecules. These vibrations cause disturbances on the water surface, leading to the formation of ripples.
What happens to the pitch of a sound if its frequency is increased?
- The pitch becomes lower
- The pitch becomes higher
- The pitch remains the same
- The loudness increases
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Answer: B. The pitch becomes higher
Pitch is directly proportional to frequency. A higher frequency means more vibrations per second, resulting in a higher-pitched or shriller sound.
Which of the following is an example of infrasound?
- A whistle
- A dog's bark
- Earthquakes
- A high-pitched musical note
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Answer: C. Earthquakes
Infrasound refers to sound waves with frequencies below the lower limit of human audibility (typically below 20 Hz). Earthquakes generate vibrations with frequencies in this range.
Soundproofing materials are designed to:
- Increase sound reflection
- Increase sound absorption
- Increase sound transmission
- Generate sound
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Answer: B. Increase sound absorption
Soundproofing aims to reduce the amount of sound that passes through a barrier or reflects within a space. This is primarily achieved by using materials that absorb sound energy.