Chapter 23: Sound Waves - Science Mcqs for Grade 7

Q.  20 dB has hundred times more energy than

a. 10 dB
b. 0 dB
c. 5 dB
d. 2 dB


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  The normal value of decibel that our ears can detect is
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MCQs:  As compare to humans, bats can hear sounds only with
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MCQs:  In one wavelength, wave passes through
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MCQs:  If frequency is high, the peak of the waves would be
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MCQs:  If frequency increases,
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MCQs:  The organs of a human that detect sounds are
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MCQs:  Measure of decibel starts from
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MCQs:  The mixture of high and low sounds is called a
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MCQs:  Echoes are formed when sound
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MCQs:  The use of echo to measure distance is known as
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MCQs:  In a flute, the length of air cutting through the holes is changed by
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MCQs:  A strong beam of ultrasound can melt even a
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MCQs:  Sound can travel through air because
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MCQs:  Some fishing boats use echo to
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MCQs:  Most of the sounds around world are
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MCQs:  X-rays are only reflected by
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MCQs:  Sounds of birds and animals are
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MCQs:  Compared to drum, the vibration of a whistle is
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MCQs:  The part of sound wave where air pressure is greater, is known as
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MCQs:  When sound travels, it
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