Audible,Infrasonic and Ultrasonic Sound

Q.

Which of the following frequency is an ultrasonic sound?

1. 300 Hz

2. 3000 Hz

3. 30000 Hz

4. 30 Hz

Q.

A sound wave is travelling in air at a speed of 343 m/s. The wavelength of the sound wave is 0.1 cm. Find the frequency of the sound wave. Is the sound audible to humans?

1. Yes, 20000 Hz
2. No, 20000 Hz

3. Yes, 343000 Hz

4. No, 343000 Hz

Q.

What are audible and non-audible sounds?

Q.

Define audible and inaudible sounds.

Q.

Sound is travelling in air at a speed of 343 m/s. The wavelength of the sound wave is 0.1 cm. Humans can easily perceive this sound.

1. True
2. False

Q.

What is the audibility range for the normal human ear?

Q.

What is the audible frequency range for a human ear? What is the sound in this range called?

Q.

Audible range of a normal human ear is:

1. 10 Hz to 20, 000 Hz

2. 20 Hz to 20, 000 Hz

3. 20 Hz to 10, 000 Hz

4. 20 Hz to 2000 Hz

Q. Devices using the multiple reflections of the sound wave are -
1. Stethoscope
2. Ultrasound Cleaning Machine
3. Megaphones
4. Echocardiography

1. 1 and 3 are correct
2. 2 and 3 are correct
3. Only 3 correct
4. 3 and 4 correct

Q. does not involve the application of ultrasonic sound.

1. SONAR
2. Echocardiography
3. Earthquake prediction
4. Breaking kidney stones

Q. The wavelength of the upper limit of the audible sound in air, is .

1. $17\text{cm}$
2. $17\text{mm}$
3. $17\text{nm}$
4. $17\mu \text{m}$

Q. Ultrasound is sound having a frequency less than 20KHz.

1. True
2. False

Q.

Sound waves with frequency smaller than 20 Hz are called:

1. ultrasound

2. infrasound

3. nanosound

4. minisound

Q. The property of ultrasound that makes it useful is its high ____.

1. speed
2. frequency
3. wavelength
4. amplitude

Q. Ultrasound can be used for which of the following purposes?

1. Echocardiography
2. Ultrasonography
3. MRI scan
4. Loudspeakers

Q. The frequency range of hearing in humans is 20 Hz to 20 kHz.

1. True
2. False

Q. Which of the following frequency is inaudible to human being?

1. 50Hz
2. 1KHz
3. 40KHz
4. 15KHz

Q.

A person has a hearing range of $20Hz$ to $20kHz$. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as $344m{s}^{-1}$.

Q. The sound produced by the seconds pendulum is infrasonic.

1. False
2. True

Q. A sound is travelling in air at a speed of $343m{s}^{-1}$. The wavelength of the sound wave is $0.1cm$. Find the frequency of the sound wave.

1. $543000Hz$
2. $633000Hz$
3. $343000Hz$
4. $400000Hz$

Q. Sound with frequency less than 20 Hz is called:

1. Infrasonic sound
2. Supersonic sound
3. Ultrasonic sound
4. Sonic sound