Sound waves travel very fast in

(a)

air

(b)

metals

(c)

vacuum

(d)

liquids

Which of the following are the characteristics of vibrations?
i. Frequency
ii. Time period
iii. Pitch
iv. Loudness

(a)

i and ii

(b)

ii and iii

(c)

iii and iv

(d)

i and iv

The amplitude of the sound wave decides its

(a)

speed

(b)

pitch

(c)

loudness

(d)

frequency

What kind of musical instrument is a sitar?

(a)

String instrument

(b)

Percussion instrument

(c)

Wind instrument

(d)

None of these

Find the odd one out.

(a)

Harmonium

(b)

Flute

(c)

Nadaswaram

(d)

Violin

Noise is produced by

(a)

vibrations with high frequency.

(b)

regular vibrations.

(c)

regular and periodic vibrations.

(d)

irregular and non-periodic vibrations.

The range of audible frequency for the human ear is

(a)

2 Hz to 2000 Hz

(b)

20 Hz to 2000 Hz

(c)

20 Hz to 20000 Hz

(d)

200 Hz to 20000 Hz

If the amplitude and frequency of a sound wave are increased, which of the following is true?

(a)

Loudness increases and pitch is higher.

(b)

Loudness increases and pitch is unchanged.

(c)

Loudness increases and pitch is lower.

(d)

Loudness decreases and pitch is lower.

High-frequency sounds that cannot be heard by you are called_________.

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Ultrasonic sound.

If the thickness of a vibrating string is increased, its pitch ___________.

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decreased