Sound Test

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Sound Test - 8

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Weekly Quiz Competition

Question 1

1 / -0

Match the following with correct response.

(1) Speed of sound in Aluminium.	(A) 326 ms^-1
(2) Speed of sound in water.	(B) 1484 ms^-1
(3) Speed of sound in air.	(C) 6420 ms^-1
(4) Speed of sound in oxygen gas.	(D) 343 ms^-1

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

The speed of sound is not always the same. Speed of sound in different for different mediums.
(1) Speed of sound in Aluminium is 6420ms^-1.
(2) Speed of sound in water is 1484ms^-1.
(3) Speed of sound in air is 343ms^-1.
(4) Speed of sound in oxygen gas 326ms^-1.

Question 2
1 / -0

“Due to the high power of ultrasound waves. It is used for breaking and cutting objects”
The above statement is

A
True

B
False

C
Partially True

D
Partially false.

Solution

Ultrasound waves vibrate at frequency higher than 20,000Hz. Ultrasonic waves are directed towards kidneys.These waves with such a high vibration break the stones into tiny pieces so they can pass out of the kidney with the urine.
Question 3
1 / -0

Statement A: Human beings are ultrasound deaf
Statement B: Ultrasonic waves can travel easily in solid, liquid and gases.
Which of the two statements is true?

A
Statement A

B
Statement B

C
Both A and B

D
None of the two

Solution

Human beings are ultrasound deaf as humans are not able to hear frequency of sound above 20,000 Hz.

Ultrasound travels through various media including gases, liquids and solids, but cannot travel through a vacuum. The speed of sound varies by the medium it travels through. Sound is likely to travel faster through solids, followed by liquids and gases.
Question 4
1 / -0

Match the following with correct response.
(1) Laws of reflection of sound
(2) An application of multiple reflection of sound
(3) Ultrasound
(4) SONAR

(A) Megaphone
(B) Measures Depth of the sea
(C) To monitor foetus inside mother’s womb
(D) Angle of reflection is equal to angle of incidence

A
1-B, 2-D, 3-A, 4-C

B
1-D, 2-A, 3-C, 4-B

C
1-C, 2-B, 3-D, 4-A

D
1-A, 2-C, 3-B, 4-D

Solution

According to the lwas of reflection of sound, the angle of incidence is equal to the angle of reflection of sound.

When a person speaks into the narrow end of the megaphone tube, the sound waves produced by his voice are prevented from spreading by successive reflections from the wider end of the megaphone tube.

Ultra-sonography uses ultrasounds for the examination of the foetus during pregnancy.The technique is used to monitor the growth,development and well being of the foetus.

SONAR (Sound Navigation and Ranging): Sonar is a device which is used to find the depth of a sea,or to locate underwater objects like enemy's submarine ,sunken ships,shoal of fish,etc.
Question 5
1 / -0

Ultra sound is produced by
(A) Tortoise
(B) Bats
(C) Dolphins
(D) Dogs

A
(A) and (B) are correct

B
(B) and (C) are correct

C
(A), (B) and (C) are correct

D
All of these

Solution

Animals like dolphins,bats and tortoises produce sounds of frequency higher than 20000 Hz known as ultrasonic sounds.
Question 6
1 / -0

A bat hears the echo of its squeak after 0.1 second. How far is the obstacle from the bat? Speed of sound is 344 ms^-1

A
17.2 m

B
170 m

C
180 m

D
18 m

Solution

Speed of sound = 344ms^-1.

Time taken to hear echo = 0.1s

⟹2 × distance = speed × time.

⟹2d = 344 × 0.1

⟹ 2 × d = 34.4

⟹ d = 17.2

Therefore,the bat is 17.2 m from its obstacle.
Question 7
1 / -0

Sonar stands for ______

A
Sound Notation and Ranging

B
Sound Navigation and Ranging

C
Sound Native and Ranging

D
None of these.

Solution

Sonar stands for Sound navigation and ranging. Sonar is a device that is used to find the depth of the sea,or to locate underwater objects like enemy's submarine,sunken ships,shoal of fish,etc.
Question 8
1 / -0

The multiple reflection of sound in a hall is called

A
Scanning

B
Echo

C
Reverberation

D
All of these

Solution

When a number of echoes of the original sound are heard,each echo being fainter than the preceding one,such multiple echoes are called reverberations. In halls and auditorium reverberation is reduced by using sound absorbing substances.Sound absorbing panels are kept near the stage.
Question 9
1 / -0

Statement A: Porpoises use ultrasound for navigation and location of food in dark
Statement B: When you listen to music or watch TV at home, the noise level is 100-120 decibels.
Which of the two statements is true?

A
Statement A

B
Statement B

C
Both A and B

D
Neither A or B.

Solution

Bat and porpoises use ultrasound for navigation and location of food in the dark. They contain ultrasound producing organs and receiver that help them to judge the position and location of food and predator.

Music and TV sounds that we hear have noise level below 90 decibels.

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Re-Attempt Weekly Quiz Competition

Sound Test - 8

Result

Sound Test - 8

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SHARING IS CARING

Question 1

1-D, 2-A, 3-C, 4-B

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

Question 2

True

False

Partially True

Partially false.

Solution

Question 3

Statement A

Statement B

Both A and B

None of the two

Solution

Question 4

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-A, 2-C, 3-B, 4-D

Solution

Question 5

(A) and (B) are correct

(B) and (C) are correct

(A), (B) and (C) are correct

All of these

Solution

Question 6

17.2 m

170 m

180 m

18 m

Solution

Question 7

Sound Notation and Ranging

Sound Navigation and Ranging

Sound Native and Ranging

None of these.

Solution

Question 8

Scanning

Echo

Reverberation

All of these

Solution

Question 9

Statement A

Statement B

Both A and B

Neither A or B.

Solution

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