[5 Mark Question Answer]

Question 15 Marks

Write two differences between loudness and pitch.

Answer

S. No.	Loudness	Pitch
$1.$	It is a characteristic of sound which distinguishes a feeble sound from a loud one of the same frequency.	It is the characteristic of sound that distinguishes a shrill sound from a hoarse sound.
$2.$	It depends on the amplitude of the sound.	It depends on the frequency of the sound.

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Question 25 Marks

Classify percussion instruments on the basis of the pitch produced by them.

Answer

Percussion instruments are classified on the basis of pitch produced by them into two groups : pitched and unpitched instruments.

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Question 35 Marks

Differentiate between music and noise. Why is it advisable to listen to music at a moderate level?

Answer

Musical sound :
$1.$ Musical sound has a pleasing effect on the ears.
$2.$ It is produced by regular vibrations-in a material
$3.$Amplitude of vibration and frequency do not change suddenly.
$4.$ The waveform is regular.
Noise :
$1.$ Noise has an irritating and unpleasant effect on the ears.
$2.$ It is produced by irregular vibrations in a material.
$3.$ Amplitude of vibration and frequency change suddenly.
$4.$ The waveform is irregula.
$5.$ It is advisable to hear music at moderate level because sounds above $80\ dB$ can cause many health hazards,
some of which are listed below.
$1.$ Feeling of annoyance, aggression, anxiety and stress
$2.$ High blood pressure heart problems
$3.$ Headache, feeling of fatigue, sleep disturbances
$4.$ Reduced work efficiency
$5.$ Loss of hearing

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PHYSICS [5 Mark Question Answer]

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