Properties of Ultrasonic Sound

Q.

In SONAR, we use

1. ultrasonic waves

2. infrasonic waves

3. radio waves

4. audible sound waves

Q.

State four practical uses of ultrasonic vibrations.

Q.

State two properties of ultrasound that make it useful to us.

Q.

State the approximate speed of ultrasound in air.

Q.

The properties of ultrasound that make it useful, are :

(a) high power and high speed

(b) high power and good directivity

(c) high frequency and high speed

(d) high frequency and bending around the objects.

Q.

How does the penetration of Ultrasound be more than that of normal sound?

Q.

The speed of highly penetrating ultrasonic waves is :

(a) lower than those of audible sound waves

(b) higher than those of audible sound waves

(c) much higher than those of audible sound waves

(d) same as those of audible sound waves

Q.

Infrasound can be heard by

1. Dogs

2. Bats

3. Rhinoceros

4. Human Beings.

Q.

Why are the waves mentioned by you (ultrasonic waves) are not audible to us?

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 wavelength

(d) very high amplitude

Q.

Humans have eyes to see and catch but bats cannot see, then how do they catch their prey?

Q. How does a bat calculate how far its prey is located. Does it do maths just as we do while solving problems?

Q.

Infrasonic vibrations have frequency:

1. less than 10 Hz

2. less than 20 Hz

3. between 20 and 20, 000 Hz

4. more than 20, 000 Hz

Q. what is sound

Q.

Explain how defects in metal blocks can be detected using ultrasound?

Q.

What are the uses of sound?

Q. Mark the correct application of ultrasound:

1. Used in electrocardiography
2. For monitoring a nuclear reaction
3. For determining the depth of sea
4. All

Q.

How is some defects in a metal block be detected using ultrasound?

Q.

Which of the following sound can be heard by monkeys and deer but not by humans?

1. infrasonics

2. ultrasonics

3. supersonics

Q.

Sound of the frequency below 20 Hz is known as

1. Ultrasonic

2. Sonar

3. Infrasonic

4. Echo

Q. Fill the vacant space in the following statement. Sound waves in the range of_____ are best at travelling over large distances.

1. Infrasound
2. Ultraviolet
3. Infrared
4. Acoustic
5. Ultrasound

Q. Ultrasound is sound above the human hearing range. It can be heard by

1. Elephants
2. Bats
3. Lions
4. Sheep

Q. State whether the given statement is True or False :

1. True
2. False

Q.

Infrasound can be heard by

1. Dog

2. Bat

3. Rhinoceros

4. Human being

Q. The ultrasound waves have a much greater penetrating power than ordinary sound because they have very high

1. Amplitude
2. Frequency
3. Wave length
4. Speed

Q.

Ultrasounds are low frequency waves.

1. True

2. False

Q. How does bats catch their prey?

1. By producing ultrasonic sound
2. By producing sound
3. None
4. By producing infrasonic sound

Q. By what bats understands position and type of prey of any obstacle in way?

1. By detecting reflection of ultrasonic sound
2. By detecting refraction of ultrasonic sound
3. By detecting deflection of infrasonic sound
4. By detecting reflection of infrasonic sound

Q. An animal which navigates and finds food by echolocation is.

1. bat
2. frog
3. tiger
4. lizard

Q. Ultrasonic waves is preferred to X-ray in medical field because ______________.