Sound Test

Result

Sound Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Which of the above two graphs (a) and (b) representing the human voice is likely to be the male voice ? Give a reason for your answer.

A
A and B

B
A

C
B

D
Cannot be determined

Solution

The two vocal properties are intensity (loudness) and frequency (pitch). Pitch of a man's voice fall under low frequency, whereas woman's voice is of the high pitch type. Pitch and intensity are proportional to each other. As seen in the graph given, we can compare the intensities of male and female voice. Female's voice has more frequency components marked as 'b' compared to men which is marked as 'a'. Women speak at one octave higher than men.
Hence, the wave 'a' represents a male voice.
Question 2
1 / -0

The loudness of sound depends on:

A
its amplitude

B
its frequency

C
its time period

D
its speed

Solution

Some of the sounds appear loud whereas others appear to be faint in the ear. The faint sound has a small amplitude whereas the loud sound has a large amplitude.Thus,the loudness or softness of a sound is determined basically by the amplitude of the wave.
Question 3
1 / -0

The loudness of sound is determined by the

A
amplitude of vibration

B
ratio of amplitude and frequency of vibration

C
frequency of vibration

D
product of amplitude and frequency of vibration

Solution

The amplitude of sound determines the loudness of sound. A sound that is faint will have a small amplitude while that of a loud sound will have larger amplitude.
Question 4
1 / -0

When we change feeble sound to loud sound we increase its :

A
frequency

B
amplitude

C
velocity

D
wavelength

Solution

The amplitude is the measure of loudness of a sound. When our music system is having a feeble sound by increasing the amplitude, the sound now becomes louder.
Question 5
1 / -0

In the bell jar experiment, as air is removed from the jar :

A
intensity of sound falls

B
speed of sound falls

C
intensity of sound increase

D
speed of sound increases.
Question 6
1 / -0

Time period of a sound wave is $$10\ ms$$. What is the frequency of the sound wave?

A
50 Hz

B
100 Hz

C
200 Hz

D
400 Hz

Solution

Given
$$T= 10\ ms = \dfrac{1}{1000} = 10^{-2}\ s$$
We know
$$f= \dfrac{1}{T}$$
$$f= \dfrac{1}{10^{-2}} = 100\ Hz$$
Question 7
1 / -0

The frequency of sound waves can be expressed in

A
Hz

B
$$\dfrac{\text{Cycles}}{\text{second}}$$

C
$$s^{-1}$$

D
All of these

Solution

The frequency means the number of full cycle of the wave per second. So all the options can be used to express the frequency. They all have same dimensions $$[ T ]^{-1}$$.
Question 8
1 / -0

Which of the following cannot travel through vacuum?

A
Light waves

B
Heat waves

C
X-rays

D
Sound waves

Solution

Light waves, heat waves, X-rays are examples of electromagnetic waves, which do not require any medium for their propagation.
Sound waves cannot travel through a vacuum. It needs a material medium for its propagation. Sound waves can propagate only when the vibrational energy of the particles of the medium is travelling from one point to another.
Question 9
1 / -0

If a wave completes 20 vibrations in 2.5s, then its frequency is

A
20 Hz

B
8 Hz

C
200 Hz

D
50 Hz

Solution

Frequency is the number of vibration per second.
So in this case the frequency of the wave is:
$$f=\dfrac{20}{2.5} Hz$$ $$=8\ Hz$$
Question 10
1 / -0

Hertz is the unit of:

A
Wavelength

B
Amplitude

C
Frequency

D
None of these

Solution

The number of cycles per unit time is known as frequency. The SI unit of frequency is Hertz $$(Hz)$$.

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Re-Attempt Weekly Quiz Competition

Sound Test - 24

Result

Sound Test - 24

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Rank

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SHARING IS CARING

Question 1

A and B

A

B

Cannot be determined

Solution

Question 2

its amplitude

its frequency

its time period

its speed

Solution

Question 3

amplitude of vibration

ratio of amplitude and frequency of vibration

frequency of vibration

product of amplitude and frequency of vibration

Solution

Question 4

frequency

amplitude

velocity

wavelength

Solution

Question 5

intensity of sound falls

speed of sound falls

intensity of sound increase

speed of sound increases.

Question 6

50 Hz

100 Hz

200 Hz

400 Hz

Solution

Question 7

Hz

$$\dfrac{\text{Cycles}}{\text{second}}$$

$$s^{-1}$$

All of these

Solution

Question 8

Light waves

Heat waves

X-rays

Sound waves

Solution

Question 9

20 Hz

8 Hz

200 Hz

50 Hz

Solution

Question 10

Wavelength

Amplitude

Frequency

None of these

Solution

User

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