Waves Test

Result

Waves Test - 71

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Weekly Quiz Competition

Question 1
4 / -1

In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics?

A
Pitch

B
Loudness

C
Quality

D
Overtones
Question 2
4 / -1

Two waves having sinusoidal waveforms have different wavelengths and different amplitude. They will be having

A
Same pitch and different intensity

B
Same quality and different intensity

C
Different quality and different intensity

D
Same quality and different pitch
Question 3
4 / -1

Intensity level 200 cm from a source of sound is 80 dB. If there is no loss of acoustic power in air and intensity of threshold hearing is 10^–12 Wm^–2 then, what is the intensity level at a distance of 4000 cm from source

A
Zero

B
54 dB

C
64 dB

D
44 dB

Solution
Question 4
4 / -1

In the musical octave `Sa\', \'Re\', \'Ga\'

A
The frequency of the note `Sa' is greater than that of 'Re', 'Ga'

B
The frequency of the note `Sa' is smaller than that of 'Re', 'Ga'

C
The frequency of all the notes `Sa', 'Re', 'Ga' is the same

D
The frequency decreases in the sequence `Sa', 'Re', 'Ga'
Question 5
4 / -1

Learned Indian classical vocalists do not like the accompaniment of a harmonium because

A
Intensity of the notes of the harmonium is too large

B
Notes of the harmonium are too shrill

C
Diatonic scale is used in the harmonium

D
Tempered scale is used in the harmonium
Question 6
4 / -1

Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns

A
Pitch-Waveform, Quality-Frequency; Loudness-Intensity

B
Pitch-Frequency Quality-Waveform; Loudness-Intensity

C
Pitch-Intensity, Quality-Waveform; Loudness-Frequency

D
Pitch-Waveform, Quality- Intensity; Loudness-Frequency
Question 7
4 / -1

A hollow pipe of length 0.8 m is closed at one end. At its open end a 0.5 m long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is 50 N and the speed of sound is 320 ms^–1, the mass of the string is

A
5 grams

B
10 grams

C
20 grams

D
40 grams

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

The ends of a stretched wire of length L are fixed at x = 0 and x = L. In one experiment, the displacement of the wire is y₁ = A sin (πx / L) sin ωt and energy is E₁, and in another experiment its displacement is y₂ = A sin (2πx / L) sin 2ωt and energy is E₂. Then

A
E₂ = E₁

B
E₂ = 2E₁

C
E₂ = 4E₁

D
E₂ = 16E₂

Solution
Question 10
4 / -1

In a large room, a person receives direct sound waves from a source 120 metres away from him. He also receives waves from the same source which reach him, being reflected from the 25 metre high ceiling at a point halfway between them. The two waves interfere constructively for wavelength of

A
20, 20/3, 20/5 etc

B
10, 5, 2.5 etc

C
10, 20, 30 etc

D
15, 25, 35 etc

Solution