Sound Test

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Sound Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

The amplitude of the vibration of an ordinary conversation between two persons is approximately

A
10-7 metres

B
10-9 metres

C
10-11 metres

D
10-13 metres

Solution

The magnitude of maximum disturbance in the medium on either side of the mean position is called the amplitude of the wave. In the case of ordinary talk, the amplitude of vibration is approximately $$10^{-9}$$m.
Question 2
1 / -0

If the time period of a wave increases, then its frequency will

A
Increase

B
Decrease

C
Remain the same

D
First increases then decreases

Solution

$$f = \dfrac{1}{T}$$

$$f\rightarrow frequency$$

$$T\rightarrow time period$$

Frequency is inversely proportional to the time period of the wave. So when time period increases then the frequency will decrease.
Question 3
1 / -0

Which of the following instrument is not a percussion instrument?

A
Mridangam

B
Dholak

C
Guitar

D
Tabla

Solution

Guitar is not a percussion instrument. Percussion instruments have a membrane which vibrates to produce sound when struck with some force.

Guitar produces sound when its strings are struck with hands and the strings start vibrating.
Question 4
1 / -0

If the amplitude of a sound is doubled, then its

A
Velocity is doubled

B
Frequency is doubled

C
Wavelength is doubled

D
None of the above

Solution

The amplitude of a sound is independent of velocity, frequency, and wavelength. So it can't be changed by changing any of them.
Hence option D.
Question 5
1 / -0

Frequency ($$\nu$$) and time period $$(T)$$ are related as

A
$$\nu$$$$\times T = 1$$

B
$$\nu$$$$/T=1$$

C
$$\nu$$$$ = T/2$$

D
$$\nu$$ = $$T^2$$

Solution

Frequency is the reciprocal of the time period.
So, frequency and time period are related as $$\nu =\dfrac{1}{T}$$
$$\therefore \nu \times T=1$$.
Question 6
1 / -0

Which of the following frequencies can be heard by a normal human being?

A
$$10^4 Hz$$

B
$$10^5 Hz$$

C
$$10^6 Hz$$

D
$$10^7 Hz$$

Solution

The audible range of frequency for human ear is $$20 \ Hz$$ to $$20 \ kHz.$$ Among the given options, only $$10^4 \ Hz$$ frequency lies in the audible range.
So option A is the answer.
Question 7
1 / -0

The pitch of a given sound can be measured by its ....................

A
Frequency

B
Wavelength

C
Time period

D
Intensity

Solution

The pitch of a given sound can be measured by its frequency. A high pitch sound corresponds to a high frequency sound wave and a low pitch sound corresponds to a low frequency sound wave.
Question 8
1 / -0

Name the sounds of the frequencies given below $$10Hz$$.

A
$$ultrasonic$$

B
$$infrasonic$$

C
$$supersonic$$

D
None of the above

Solution

Infra-sound is a low-frequency sound. It is sound that is lower in frequency than $$20 \ Hz$$ or cycles per second, the normal limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infra-sound, but at higher intensities it is possible to feel infra-sound vibrations in various parts of the body.
Question 9
1 / -0

Which of the following voice is likely to have minimum frequency?

A
Baby girl

B
Baby boy

C
A man

D
A woman

Solution

The voice of an adult man is of lower pitch in comparison to the voices of the baby boy, a baby girl and a woman. Since frequency of a sound is directly proportional to its pitch, man’s voice is of minimum frequency in comparison to a boy, a girl or a woman’s voice
Question 10
1 / -0

The unit of frequency is:-

A
Hertz

B
Joule

C
Ohm

D
Kilo Calorie

Solution

Frequency is the number of complete vibrational cycles of a medium per a given amount of time. The frequency would have units of cycles/second, waves/second or vibrations/second. The unit for frequency is the Hertz (abbreviated Hz) where 1 Hz is equivalent to 1 cycle/second.

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Re-Attempt Weekly Quiz Competition

Sound Test - 11

Result

Sound Test - 11

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Rank

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SHARING IS CARING

Question 1

10-7 metres

10-9 metres

10-11 metres

10-13 metres

Solution

Question 2

Increase

Decrease

Remain the same

First increases then decreases

Solution

Question 3

Mridangam

Dholak

Guitar

Tabla

Solution

Question 4

Velocity is doubled

Frequency is doubled

Wavelength is doubled

None of the above

Solution

Question 5

$$\nu$$$$\times T = 1$$

$$\nu$$$$/T=1$$

$$\nu$$$$ = T/2$$

$$\nu$$ = $$T^2$$

Solution

Question 6

$$10^4 Hz$$

$$10^5 Hz$$

$$10^6 Hz$$

$$10^7 Hz$$

Solution

Question 7

Frequency

Wavelength

Time period

Intensity

Solution

Question 8

$$ultrasonic$$

$$infrasonic$$

$$supersonic$$

None of the above

Solution

Question 9

Baby girl

Baby boy

A man

A woman

Solution

Question 10

Hertz

Joule

Ohm

Kilo Calorie

Solution

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