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Sound - 1 (Class IX)

All about sound

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following ranges of frequency is known as the audible range?

  1. 0 - 20 Hz
  2. 20 Hz - 20,000 Hz
  3. 20,000 Hz - 40000 Hz
  4. 40000 Hz - 10,0000 Hz
  5. None of these
Question 2 Multiple Choice (Single Answer)

Pitch is expressed in

  1. metres
  2. metre/second
  3. hertz
  4. second
  5. metre square
Question 3 Multiple Choice (Single Answer)

Bats produce ultrasound to catch their prey. Which of the following animals do(es) the same?

  1. Dogs
  2. Elephant
  3. Monkey
  4. Dolphin
  5. All of the above
Question 4 Multiple Choice (Single Answer)

When sound wave travels through a medium, the particles of the medium show compression and rarefaction. What happens when compression takes place in the medium?

  1. The density of the medium decreases.
  2. The pressure of the medium decreases.
  3. The molecules of the medium come closer to each other.
  4. The wavelength of the wave increases.
  5. All of the above
Question 5 Multiple Choice (Single Answer)

Why are sound waves considered as mechanical waves?

  1. The sound wave is a disturbance that is transported through a medium.
  2. The particles of sound waves vibrate in a direction perpendicular to the direction of propagation of wave.
  3. The particles of sound waves always tend to come back to their original positions when set in wave motion.
  4. All of the above
  5. None of these
Question 6 Multiple Choice (Single Answer)

Which of the following is/are the main characteristics of sound waves?

  1. Wavelength
  2. Amplitude
  3. Frequency
  4. Phase
  5. All of the above
Question 7 Multiple Choice (Single Answer)

The outer ear collects sound from the surroundings. These sound vibrations are amplified several times by the three bones in the middle ear. These three bones are

  1. pinna, anvil and stirrup
  2. hammer, anvil and stirrup
  3. hammer, cochlea and stirrup
  4. pinna, cochlea and stirrup
  5. hammer, anvil and pinna
Question 8 Multiple Choice (Single Answer)

The velocity of sound waves in different media depends upon

  1. nature of the medium
  2. temperature
  3. humidity present in the air
  4. All of the above
  5. None of these
Question 9 Multiple Choice (Single Answer)

According to the wave equation, which of the following statements is correct about the velocity of sound waves?

  1. It is inversely proportional to frequency.
  2. It is inversely proportional to wavelength.
  3. It is directly proportional to wavelength and frequency.
  4. It is directly proportional to frequency and inversely proportional to wavelength.
  5. It is directly proportional to wavelength and inversely proportional to frequency.
Question 10 Multiple Choice (Single Answer)

Which of the following characteristics of sound allow(s) the ear to distinguish sounds that have the same pitch and loudness?

  1. Wavelength
  2. Intensity
  3. Tone
  4. Timbre
  5. All of the above
Question 11 Multiple Choice (Single Answer)

SONAR measures distance, direction and speed of underwater objects using

  1. infrared waves
  2. ultrasonic waves
  3. radio waves
  4. microwaves
  5. All of the above
Question 12 Multiple Choice (Single Answer)

One can hear his sound echo by shouting loudly in a big hall. What causes this echo of sound?

  1. Refraction of sound waves
  2. Dispersion of sound waves
  3. Reflection of sound waves
  4. Diffraction of sound waves
  5. None of these
Question 13 Multiple Choice (Single Answer)

Which of the following is the correct order of sound waves reaching our ears?

(a) Disturbance in the medium
(b) Vibration
(c) Compression rarefaction
(d) Propagation of waves
(e) Ears
(f) Sound energy produced

  1. (a), (d), (b), (f), (c), (e)
  2. (a), (b), (c), (d), (e), (f)
  3. (b), (f), (a), (c), (d), (e)
  4. (f), (b), (a), (c), (d), (e)
  5. None of these
Question 14 Multiple Choice (Single Answer)

What is the time interval between the original sound and reflected sound when echo is heard?

  1. Less than 1/10 s
  2. Less than 1/20 s
  3. More than 1/10 s
  4. More than 1/20 s
  5. None of these
Question 15 Multiple Choice (Single Answer)

The speed of sound is maximum in

  1. iron
  2. rubber
  3. wood
  4. brick
  5. diamond
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