Sound Test

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Sound Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Find the incorrect statement,

A
The distance between crest and trough is λ/2

B
The speed of the wave doesn’t depend on properties of the medium.

C
120. dB means intensity is 1W/m²

D
Ultrasound is produced by electronic oscillator.

Solution

Explanation:

The distance between crest and trough is half of wavelength. Loudness of sound 120 dB means its intensity of 1W/m². Ultrasound is produced by electronic oscillator. The speed of the wave depends on properties of medium.
Question 2
1 / -0

A boat at anchor is rocked by waves whose consecutive crests are 100m apart. The wave velocity of the moving crests is 20m|s. What is the frequency of rocking of the boat?

A
0.2Hz

B
0.3Hz

C
0.4Hz

D
0.1Hz

Solution

Explanation:

Distance between two consecutive crests is called wavelength. Here, wavelength= 100 m, wave velocity = 20m/s. frequency = wave velocity/ wavelength. Frequency= 20/100 = 0.2Hz.
Question 3
1 / -0

Calculate the wavelength of a sound wave whose frequency is 820Hz and speed is 440m/s in a given medium.

A
0.55

B
0.50

C
0.53

D
0.57

Solution

Explanation:

Wavelength= wave speed / frequency, wavelength=440ms⁻¹/840Hz = 0.53m.
Question 4
1 / -0

“Wave motion shifts mass from one region to another” The above statement is

A
Partially true

B
False

C
True

D
Partially false.

Solution

Explanation:

Wave motion shifts wave energy from one region to another region. Mass is not transferred during wave motion.
Question 5
1 / -0

A source produces 20 crests and 20 troughs in 0.2 second. Find the frequency of the wave.

A
150Hz

B
100Hz

C
1Hz

D
200Hz

Solution

Explanation:

Time–period=0.2/20 = 0.01 second. Frequency = 1/time–period = 1/0.01 = 100Hz.
Question 6
1 / -0

Which wave property determines loudness?

A
frequency

B
amplitude

C
pitch

D
All of these

Solution

Explanation:

Loudness of sound depends upon amplitude. Amplitude is the maximum displacement from mean position.
Question 7
1 / -0

The maximum displacement of the particle of the mean from its mean position is called the

A
Amplitude

B
wavelength

C
none of these

D
wave number

Solution

Explanation:

The maximum displacement from the particle of the mean position is called the Amplitude. Loudness of sound depends upon amplitude.
Question 8
1 / -0

Sound wave is a

A
transverse wave

B
both a and b

C
longitudinal wave

D
None of these.

Solution

Explanation:

Sound wave is a longitudinal wave as the wave particles of sound travel parallel to the direction of motion by forming compression and rarefaction.
Question 9
1 / -0

X – rays, light rays are electromagnetic waves is a

A
True statement

B
Partially True

C
Partially false

D
False statement

Solution

Explanation:

X-rays, light rays are electrostatic waves. These waves do not require material medium for its propagation.
Question 10
1 / -0

Crests and troughs are formed in

A
Transverse wave

B
both a and b

C
Longitudinal wave

D
None of these.

Solution

Explanation:

Crests and troughs are formed in transverse wave. The upward movement from mean position is called crest and downward movement is called troughs.

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Re-Attempt Weekly Quiz Competition

Sound Test - 1

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Sound Test - 1

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SHARING IS CARING

Question 1

The distance between crest and trough is λ/2

The speed of the wave doesn’t depend on properties of the medium.

120. dB means intensity is 1W/m2

Ultrasound is produced by electronic oscillator.

Solution

Question 2

0.2Hz

0.3Hz

0.4Hz

0.1Hz

Solution

Question 3

0.55

0.50

0.53

0.57

Solution

Question 4

Partially true

False

True

Partially false.

Solution

Question 5

150Hz

100Hz

1Hz

200Hz

Solution

Question 6

frequency

amplitude

pitch

All of these

Solution

Question 7

Amplitude

wavelength

none of these

wave number

Solution

Question 8

transverse wave

both a and b

longitudinal wave

None of these.

Solution

Question 9

True statement

Partially True

Partially false

False statement

Solution

Question 10

Transverse wave

both a and b

Longitudinal wave

None of these.

Solution

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120. dB means intensity is 1W/m²