Audible and Inaudible Sounds

Q.

What is the audible range of frequencies for human beings?

1. 1 Hz - 1 kHz

2. 1 kHz - 100 kHz

3. 20 Hz - 20 kHz

4. 10 Hz - 88 kHz

Q.

Define the Audible range of sound

Q.

The wavelength of a sound wave is 3 cm and speed of sound is 340 $m{s}^{-1}$. Will it be audible? [2 MARKS]

Q.

Ultrasonic frequency range is

1. Below 20 Hz

2. 20 Hz to 20 kHz

3. Above 20 kHz

4. no limit

Q. What is the range of ultrasonic vibration ?

Q.

The sound waves with a frequency greater than 20 KHz are known as:

1. Ultrasound

2. Infrasound

3. Supersound

4. Megasound

Q.

What is SONAR ? How is it used to determine the depth of an ocean?

Q.

Which of the sounds having the following frequencies can be heard by the human beings and which cannot?

(a) 6 Hz (b) 5000 Hz (c) 10000 Hz (di) 35000 Hz (e) 18 kHz

Q. WHY DO WE NOT HEAR THE SCREAMS OF A BAT

Q.

(a) What is the upper limit of frequency of human hearing ?

(b) What is the lower limit of frequency of human hearing ?

(c) Name one animal which can produce ultrasonic sounds.

(d) Name two animals which can hear ultrasonic sounds.

Q.

Three different vibrating objects produce three of sounds X, Y and Z. The sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X can be heard by a bat whereas the sound Y can be heard by a rhinoceros. What type of sounds are X, Y and Z ?

Q. Which of the following frequency ranges are audible to us?

1. 20-200 Hz
2. 200-2000 Hz
3. 2000-20, 000 Hz
4. 0-20 Hz

Q. Can some people really hear sounds above 20000 Hz?

Q.

One of the following can hear infrasound. This one is :

(a) dog (b) bat (c) rhinoceros (d) humans

Q.

Which of the following sound frequencies can be heard by a woman having a normal hearing range?

A. 25000 Hz

B. 15 kHz

C. 40000 Hz

D. 25 Hz

(a) A and B (b) B and C (c) B and D (d) only D

Q.

What is the name of very high frequency sounds which cannot be heard by the human ear?

Q.

Out of the following, which frequencies are not clearly audible to the human ear?

1. 30 Hz

2. 30, 000 Hz

3. 300 Hz

4. 3000 Hz

Q. Ultrasonic sound have frequency ___.

1. below 20 Hz
2. between 20-2, 000 Hz
3. between 2, 000-20, 000 Hz
4. above 20, 000 Hz

Q.

We have learnt that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heard by us?

Q. Which among the following frequencies is inaudible to humans?

1. $50Hz$
2. $30Hz$
3. $20Hz$
4. $5Hz$

Q. Audible range of frequencies for humans is .

1. 20- 2000 Hz
2. 20-200 Hz
3. 20-20000 Hz

Q.

Which of the following frequency of sound can be heard by a dog but not by a man ?

(a) 50, 000 hertz (b) 15, 000 hertz.

Q.

Select the frequencies which will not be audible by human ears: 15 Hz, 250 Hz, 1000 Hz, and 30000 Hz.

Q.

The range of audible frequencies to man is 20 Hz to 20, 000 Hz.

1. True
2. False

Q.

The ultrasound waves can penetrate into matter to a large extent because they have :

(a) very high speed (b) very high frequency (c) very high quality (d) very high amplitude.

Q. What is the approximate range of audible sound frequencies for a human with good hearing?

1. From $20Hz$ to $2000Hz$
2. From $20Hz$ to $20000Hz$
3. From $200Hz$ to $20000Hz$
4. From $200Hz$ to $200000Hz$

Q. The graph given here shows the frequency of sound emitted by a source for 30 seconds. For how many seconds a normal human being be able to hear the sound?

Time second \( \longrightarrow \)

1. 10 s
2. 20 s
3. 25 s
4. 30 s

Q. Write the audible range of frequency for the normal human ear.

Q. Assertion :Ultrasonic waves are longitudinal waves of frequency grater than $20,000Hz$ Reason: The maximum frequency of audible sound waves is $20,000Hz$

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Which of the following correctly supports the fact that bats can hunt at night?

1. They have an excellent eyesight.

2. They can smell their prey.

3. They use ultrasonic waves to detect the position of the prey.

4. They have excellent camouflage capability.