Q1. Which of the two sound waves have greater amplitude?
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green coloured wave
red coloured wave
blue coloured wave
all waves have same ampitude
Q2. What is the the amplitude and time period of the sound wave shown?
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amplitude-0.2cm, time period-10s
amplitude-20cm, time period- 0.8s
amplitude- 10cm, time period-0.2s
amplitude- 10cm, time period- 0.4s
3. Which one of the two sound waves gives higher pitch?
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A
B
both A and B will have same pitch
data is not sufficient
4. Which one of the following is audible?
10Hz
25Hz
19kHz
22000Hz
both 25Hz and 19kHz
5. Ultrasonic vibrations are sound waves with frequency
lesser than 20Hz
greater than 20Hz
greater than 20kHz
between 20Hz to 20kHz
6. What is the unit of frequency?
m
cm
s
hertz
7. With which unit can we measure loudness?
hertz
second
metre
decibel
8. How can you reduce noise pollution?
by planting trees
by hanging curtains
by avoiding bursting of crackers
all of the above
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Answer:
B
Explanation:
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