Sonar

Q. Question 19
Explain the working and application of a sonar.

Q.

Give the applications of ultrasound in the field of medicine.

Q.

Write short notes on SONAR.

Q.

Explain the working of sonar?

Q.

What does the acronym SONAR stand for?

1. Sound Navigation and Ranging

2. Sound Notification and Ranging

3. Sound Notification and Reverberation

4. Sound Navigation and Reverberation

Q.

The velocity of ultrasonic sound in water is 1400 m. The depth of the ocean as detected by SONAR, if the time taken to receive the reflected wave is 15s, is

1. 1050 m

2. 105 m

3. 10.5 km

4. 21 km

Q.

SONAR is based on the principle of

1. echo

2. resonance

3. reverberation

4. any one of the above

Q.

What is Sonar? Explain the working and application of Sonar. [5 MARKS]

Q.

SONAR is a technique that uses the reflection of sound to find the distance between objects.

1. True
2. False

Q.
What is Sonar? Explain the working and application of Sonar.

Q. What is full form of SONAR?

1. Sound of Natural Agriculture Research
2. Sound of Navigation and Research
3. Sound Navigation and Ranging
4. System of Navigation and Research

Q. In a sonar, ultrasonic waves are sent into the sea water and the reflected waves from a sunken ship are received after $2.0s$. If the velocity of waves in sea water is $1450ms-1$, find the depth of sunken ship.

1. $1450m$

2. $2800m$

3. $3000m$

4. $2900m$

Q. Question 1
A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

Q.

What is sonography?

Q.

The method used in SONAR is

1. Echo ranging

2. Ultrasonography

3. Echocardiography

4. None of these

Q. Explain Sonar and defect in metal block

Q.

Sonar is used to detect the ________ of a sea.

Q.

What does the acronym SONAR stand for?

1. Sound Navigation and Ranging

2. Sound Notification and Ranging

3. Sound Notification and Reverberation

4. Sound Navigation and Reverberation

Q.

SONAR is used to produce pure sound in laboratory.

1. True
2. False

Q.

SONAR works on the principle of

1. reflection of sound

2. momentum of sound waves

3. energy of sound waves

4. refraction of sound waves

Q. In a SONAR, ultrasonic waves are sent into the sea water and the reflected waves from a sunken ship are received after $2\text{s}$. If the velocity of waves in sea water is $1450{\text{m s}}^{-1}$​, find the depth of the sunken ship.

1. $2900\text{m}$
2. $1450\text{m}$
3. $2800\text{m}$
4. $3000\text{m}$

Q. What type of frequencies do bats use for echolocation?

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

Q.

Radar is developed by understanding the principle of optics

1. True
2. False

Q.

A sonar uses the reflection of light for locating the position of an object under sea.

1. True
2. False

Q.

Can birth defects be seen on ultrasound?

Q.

What does the acronym SONAR stand for?

Q.

Write the following statements in a sequential order to find the depth of the ocean bed by using SONAR.

(A) The depth of the ocean bed can be found by, $d=\frac{vt}{2}$.

(B) The velocity of ultrasonic in the ocean water is $v$ and the time is taken to receive the reflected ultrasonic from the ocean bed is$t.$

(C). At the bottom of a ship two devices, first a transmitter which produces ultrasonic and second a receiver for the detection of the reflected ultrasonic from the ocean bed, are fixed.

(D) If depth of oceans bed is d, then $v=\frac{2d}{t}$

1. CBAD

2. BCDA

3. CBDA

4. BCAD

Q. 3 conditions for an echo

Q. Choose whether true or false:-
Fishermen use echoes to locate fishes underwater.

1. True
2. False

Q. A ship moving at a speed of $1m{s}^{-1},$ emits a sonar signal directed towards the seabed and receives the signal after it has travelled $2m$. Calculate the approximate depth of seabed if the speed of sound in seawater is $1500m{s}^{-1}.$

1. 2500 m
2. 1000 m
3. 1500 m
4. 2000 m