Sound Test

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Sound Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

The velocity of sound in vacuum is:

A
$$332 ms^{-1}$$

B
$$330 ms^{-1}$$

C
$$288 ms^{-1}$$

D
0

Solution

We know that mechanical wave requires medium to travel. Sound is also a mechanical wave and vacuum means absence of medium therefore sound cannot travel in vacuum i.e. velocity of sound in vacuum is zero .
Question 2
1 / -0

A vibrating body:

A
will always produce sound

B
may or may not produce sound if the amplitude of vibration is low

C
will produce sound which depends upon frequency

D
none of the above

Solution

A vibrating body vibrates the surrounding air, and when these vibrations reach our ears we hear sound. But, some vibrations cannot be perceived as sound to humans as human ears can only detect sound in the frequency range of $$20Hz\ to\ 20,000Hz$$, so depending upon the vibration frequency, can only we define a vibration as sound.
Question 3
1 / -0

The number of cycles an oscillator completes in each second is called its _______________.

A
Frequency

B
Velocity

C
Amplitude

D
Angular velocity

Solution

The number of cycles an oscillator completes in each second is called its frequency.
The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
Question 4
1 / -0

A person is listening to a tone 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between the successive compression from the source ?

A
5 milli second

B
1 milli second

C
2 milli second

D
2 second

Solution

Given - $$ n=500Hz$$ ,
the time interval between two successive compressions or rarefactions is called , time period of wave , which is given by ,
$$T=1/n=1/500=0.002s=2millisecond$$
Question 5
1 / -0

What is the time period of a wave having frequency of $$50 \ Hz$$?

A
$$0.02 \ s$$

B
$$0.20 \ s$$

C
$$2.0 \ s$$

D
$$20 \ s$$

Solution

$$\text {Time period} = \dfrac{1}{\text{frequency}}= \dfrac{1}{50}=\ 0.02 \ s$$
Question 6
1 / -0

True or false.
The pitch of the sound made by a guitar string can be lowered by replacing the string with a thicker string.

A
True

B
False

C
Ambiguous

D
Data insufficient

Solution

Answer is A.
Thick strings with large diameters vibrate slower and have lower frequencies than thin ones. That is, lower the pitch. A thin string with a 10 millimeter diameter will have a frequency twice as high as one with a larger, 20 millimeter diameter. This means that the thin string will sound one octave above the thicker one. Hence, notes of different frequencies can be produced by vibrating different strings with different diameters.
Hence, the statement is true.
Question 7
1 / -0

The distance between two consecutive compressions is $$1.4 m$$. The wavelength of the wave is

A
$$2.8m$$

B
$$1.4m$$

C
$$0.7m$$

D
$$4.2m$$

Solution

Wave length $$\lambda$$ is defined as the distance between two successive compressions or rarefactions .
It is given that the distance between two successive compressions is 1.4m, therefore wavelength $$\lambda=1.4m$$ .
Question 8
1 / -0

An object attached to one end of a spring makes 20 vibrations in 10s. Its frequency is

A
2Hz

B
10s

C
0.05Hz

D
2s

Solution

Answer is A.

The frequency (f) of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
In this case, an object attached to one end of a spring makes 20 vibrations in 10 s. That is, 20 vibration in 10 seconds. S in one second it makes 2 vibrations.
Therefore, the frequency of the object is 2 Hertz.
Question 9
1 / -0

Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?

A
infrasonic sounds

B
ultrasonic sounds

C
audible sounds

D
none of these

Solution

Answer is A.

An earthquake produces infra-sound before the main shock wave. Infra-sound is a low-frequency sound. It is sound that is lower in frequency than 20 Hz (hertz) or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infra-sound, the sound pressure must be sufficiently high.
Rhinos have extremely good ears, picking up infra-sound far deeper than the range of human hearing.
Rhinos can hear down to a frequency of four hertz, whereas even a human baby, with entirely undamaged ears, can normally only pick up sounds as low as 20 hertz. Giraffes and elephants can also hear in this infra-sound range.
Hence, we can see some animals get disturbed and start running here and there just before the earthquakes because they can hear infrasonic sound.
Question 10
1 / -0

Which is true for a wave? (here n = frequency, T = time period).

A
nT = 1

B
$$\displaystyle\frac{n}{T}\,=\, 2$$

C
n = T

D
None of these

Solution

Option A

Frequency is number of vibrations per (one) second, and time period is the time taken to complete one vibration.
Let a vibrating body completes n vibrations in 1 s,
therefore time taken to complete one vibration , $$T=(1/n)$$ second
therefore we have , $$T=1/n$$ ,
or $$nT=1$$

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Re-Attempt Weekly Quiz Competition

Sound Test - 19

Result

Sound Test - 19

Score

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Rank

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SHARING IS CARING

Question 1

$$332 ms^{-1}$$

$$330 ms^{-1}$$

$$288 ms^{-1}$$

0

Solution

Question 2

will always produce sound

may or may not produce sound if the amplitude of vibration is low

will produce sound which depends upon frequency

none of the above

Solution

Question 3

Frequency

Velocity

Amplitude

Angular velocity

Solution

Question 4

5 milli second

1 milli second

2 milli second

2 second

Solution

Question 5

$$0.02 \ s$$

$$0.20 \ s$$

$$2.0 \ s$$

$$20 \ s$$

Solution

Question 6

True

False

Ambiguous

Data insufficient

Solution

Question 7

$$2.8m$$

$$1.4m$$

$$0.7m$$

$$4.2m$$

Solution

Question 8

2Hz

10s

0.05Hz

2s

Solution

Question 9

infrasonic sounds

ultrasonic sounds

audible sounds

none of these

Solution

Question 10

nT = 1

$$\displaystyle\frac{n}{T}\,=\, 2$$

n = T

None of these

Solution

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