Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 8th Standard Science - English Medium - Acoustics

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Samacheer Kalvi 8th Science - Acoustics - Book Back Questions in English Medium

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Question 1 Of 10

The velocity of sound in air at a particular temperature is 330 m s–1. What will be its value when the temperature is doubled and the pressure is halved?

330 ms–1 165 ms–1 330 × 2 320 / 2 ms–1

Question 2 Of 10

If a sound wave travels with a frequency of 1.25 × 104 Hz at 344 m s–1, the wavelength will be

27.52 m 275.2 m 0.02752 m 2.752 m

Question 3 Of 10

When a sound wave travels through air, the air particles

vibrate along the direction of the wave motion vibrate but not in any fixed direction vibrate perpendicular to the direction of the wave motion do not vibrate

Question 4 Of 10

Velocity of sound in a gaseous medium is 330 m s–1. If the pressure is increased by 4 times without causing a change in the temperature, the velocity of sound in the gas is

330 ms–1 660 ms1 156 ms–1 990 ms–1

Question 5 Of 10

The sound waves are reflected from an obstacle into the same medium from which they were incident.

speed frequency wavelength None of these

Question 6 Of 10

Velocity of sound in the atmosphere of a planet is 500 m s–1. The minimum distance between the sources of sound and the obstacle to hear the echo, should be

17 m 20 m 25 m 50 m

Question 7 Of 10

The frequency, which is audible to the human ear is

50 kHz 20 kHz 15000 kHz . 10000 kHz