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# XI_PHYSICS_SOUND AND WAVES_5 online Test

If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of ____.
9
3
6
Intensity level of a sound of intensity I is 30 dB. The ratio  is (Where  is the threshold of hearing) ____.
3000
1000
300
30
Decibel is unit of ____.
intensity of light
sound loudness
Quality of a musical note depends on ____.
harmonics present
amplitude of the wave
fundamental frequency
velocity of sound in the medium
When we hear a sound, we can identify its source from ____.
amplitude of sound
intensity of sound
wavelength of sound
overtones present in the sound
A man  can hear only upto 10 kHz and another man  upto 20 kHz. A note of frequency 500 Hz is produced before them from a stretched string. Then ____.
both will hear sounds of same pitch but different quality
both will hear sounds of different pitch but same quality
both will hear sounds of different pitch and different quality
both will hear sounds of same pitch and same quality
The amplitude of two waves are in ratio 5 : 2. If all other conditions for the two waves are same, then what is the ratio of their energy densities ____.
5 : 2
10: 4
2.5 : 1
25 : 4
A is singing a note and at the same time B is singing a note with exactly one-eighth the frequency of the note of A. The energies of two sounds are equal, the amplitude of the note of B is ____.
same that of A
twice as that of A
four times as that of A
eight times as that of A
Quality depends on ____.
intensity
loudness
timbre
frequency
Assertion: Diode lasers are used as optical sources in optical communication. Reason: Diode lasers consume less energy.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false
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