The power of a sound from the speaker of a radio is 20 mW. By turning the knob of the volume control, the power of the sound is increased to 400 mW. The power increase in decibels as compared to the original power is ____.
13 dB
10 dB
20 dB
800 dB
If separation between screen and source is increased by 2 % what would be the effect on the intensity ____.
increases by 4 %
increases by 2 %
decreases by 2 %
decreases by 4 %
The musical interval between two tones of frequencies 320 Hz and 240 Hz is ____.
80
560
320 × 240
In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics?
Pitch
Loudness
Quality
Overtones
The intensity level due to two waves of the same frequency in a given medium is 1 bel and 5 bel. Then the ratio of amplitudes is ____.
1 : 4
1 : 2
1 : 104
1 : 102
It is possible to recognize a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice ____.
has a definite pitch
has a definite quality
has a definite loudness
can penetrate the wall
Of the following the one which emits sound of higher pitch is?
mosquito
lion
man
woman
In the musical octave ‘Sa’, ‘Re’, ‘Ga’ ____.
the frequency of the note ‘sa’ is greater than that of ‘re’, ‘ga’
the frequency of the note ‘sa’ is smaller than that of ‘re’, ‘ga’
the frequency of all the notes ‘sa’, ‘re’, ‘ga’ is the same
the frequency decreases in the sequence ‘sa’, ‘re’, ‘ga’
Tone A has frequency of 240 Hz. Of the following tones, the one which will sound least harmonious with A is ____.
240
480
360
450
Learned Indian classical vocalists do not like the accompaniment of a harmonium because ____.
intensity of the notes of the harmonium is too large
notes of the harmonium are too shrill
diatonic scale is used in the harmonium
tempered scale is used in the harmonium
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 ____.
Column A Column B
Pitch Waveform
Quality Frequency
Loudness Intensity
pitch-waveform, quality-frequency; loudness-intensity
pitch-frequency, quality-waveform; loudness-intensity
pitch-intensity, quality-waveform; loudness- frequency
pitch-waveform, quality- intensity; loudness-frequency
/
Zero
54 dB
64 dB
44 dB
A point source emits sound equally in all directions in a non-absorbing medium. Two points and are at distances of and respectively from the source. The ratio of the intensities of the waves at and is ____.
9 : 4
2 : 3
3 : 2
4 : 9
Quality depends on ____.
intensity
loudness
timbre
frequency