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Sound

Test in Sound chapter of Class 7

17 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

The approximate speed of sound in iron is

  1. 332 m/s
  2. 1500 m/s
  3. 5100 m/s
  4. 5100 km/s
  5. 12000 m/s
Question 2 Multiple Choice (Single Answer)

Which of the following is the source of sound?

  1. Still body
  2. Any moving body
  3. Vibrating body
  4. Metallic body
  5. A body in vaccum
Question 3 Multiple Choice (Single Answer)

What is the speed of sound in air at room temperature?

  1. 332 m/s
  2. 332 km/s
  3. 33.2 m/s
  4. 33.2 km/s
  5. 332 cm/s
Question 4 Multiple Choice (Single Answer)

The speed of sound will be maximum in which of the following?

  1. Railway tracks
  2. Bucket of water
  3. Carbon dioxide gas
  4. Vaccum
  5. Refined oil
Question 5 Multiple Choice (Single Answer)

Which of the following simple instruments is used to produce the sound of a fixed frequency?

  1. Simple pendulum
  2. Tongs
  3. Tuning fork
  4. Plastic scale
  5. Metallic scale
Question 6 Multiple Choice (Single Answer)

Which is the correct order of the speed of sound?

  1. Solid > Liquid > Gas
  2. Solid < Liquid < Gas
  3. Gas < Solid < Liquid
  4. Solid = Liquid = Gas
  5. Solid placed in vaccum > Solid placed in air
Question 7 Multiple Choice (Single Answer)

If a drum is hit gently, why is a soft sound produced?

  1. The frequency is less.
  2. The amplitude is less.
  3. The time period is less.
  4. The time period is more.
  5. The amplitude is more.
Question 8 Multiple Choice (Single Answer)

Which of the following relations is correct?

  1. Time period = 1/Frequency
  2. Time period = 1/Amplitude
  3. Time period = Frequency
  4. Time period = Amplitude
  5. Amplitude = Frequency
Question 9 Multiple Choice (Single Answer)

Which of the following is the correct S.I. unit of frequency?

  1. Metre
  2. Metre/Second
  3. Seconds
  4. Hertz
  5. Decibel
Question 10 Multiple Choice (Single Answer)

The Galton whistle heard by the dogs, produces which kind of vibrations?

  1. Subsonic vibrations
  2. Supersonic vibrations
  3. Sonic vibrations
  4. Ultrasonic vibrations
  5. Infrasonic vibrations
Question 11 Multiple Choice (Single Answer)

Which of the following is/are the uses of Ultrasonic vibrations?

  1. Relieving joint pain
  2. Animals catching prey.
  3. Homogenising milk
  4. Studying human anatomy
  5. All of these
Question 12 Multiple Choice (Single Answer)

The maximum displacement of a wave on either side of its mean position is known as

  1. time period
  2. oscillation
  3. vibration
  4. amplitude
  5. frequency
Question 13 Multiple Choice (Single Answer)

When we pluck a wire of violin and sitar, the notes produced are different. This is referred to as which of the following?

  1. Timbre
  2. Pitch
  3. Frequency
  4. Noise
  5. Amplitude
Question 14 Multiple Choice (Single Answer)

Why does the chirping of birds appear shrill to the ear?

  1. The Timbre is high.
  2. The amplitude is high.
  3. The frequency of sound is low.
  4. The frequency of sound is high.
  5. The amplitude is low.
Question 15 Multiple Choice (Single Answer)

Which of the following is the S.I Unit of measuring sound pressure level?

  1. Hertz
  2. Pascal
  3. Watt
  4. Decibel
  5. Ampere
Question 16 Multiple Choice (Single Answer)

Sonar fitted in ships helps to find

  1. presence of oil in sea water
  2. presence of icebergs
  3. hotness of sea water
  4. coldness of sea water
  5. depth of sea water
Question 17 Multiple Choice (Single Answer)

Why is the roaring of a lion loud?

  1. It is because the frequency of sound is high
  2. The amplitude is high
  3. The pitch is high
  4. The amplitude is low
  5. The Timbre is high
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