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Published on: 03/09/2019
Acoustics
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
A whistle giving out a sound of frequency 450 Hz, approaches a stationary observer at a speed of 33 ms–1. The frequency heard by the observer is (speed of sound = 330 ms–1) ______.
2.
If the energy in a longitudinal wave travels from south to north, the particles of the medium would be vibrating in _____
3.
Rapid back and forth motion of a particle about its mean position is called _____
4.
High pressure region
5.
Ultrasonic
6.
Echo
7.
Infrasonic
8.
Name three animals, which can hear ultrasonic vibrations.
9.
What will be the frequency sound having 0.20 m as its wavelength, when it travels with a speed of 331 m s–1?
10.
A sound wave has a frequency of 200 Hz and a speed of 400 m s–1 in a medium. Find the wavelength of the sound wave.
11.
Why does sound travel faster on a rainy day than on a dry day?
12.
Velocity of sound in the atmosphere of a planet is 500 ms-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
13.
The sound waves are reflected from an obstacle into the same medium from which they were incident. Which of the following changes?
speed
frequency
wavelength
none of these
14.
Velocity of sound in a gaseous medium is 330 ms-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 ms-1
156 ms-1
990 ms-1
15.
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
16.
Suppose that a sound wave and a light wave have the same frequency, then which one has a longer wavelength?
a) Sound
b) Light
c) both a and b
d) data not sufficient.
1.
( )
500 Hz
2.
( )
South to north
3.
( )
Vibration
4.
Compressions
5.
22 kHz
6.
Ultrasonography
7.
10 Hz
8.
Dolphins, dogs, bats can hear the ultrasonic vibrations.
9.
Given: V = 331 ms-1, λ = 0.20 m, n =?
V = n x λ
331 = n(0.20)
n = \(\frac{331}{0.20}\) = 1655 Hz
10.
Given:
n = 200 Hz
v = 400 ms-1
λ = ?
V = n x λ
\(λ= \frac { V }{ n } =\frac { 400 }{ 200 } \)
λ = 2m
11.
(i) During rainy days, the moisture content is more in the atmosphere and speed of sound increases with increase in humidity.
(ii) Hence the sound travels faster on rainy days.
12.
(c)
25 m
13.
(d)
none of these
14.
(a)
330 ms-1
15.
(a)
vibrate along the direction of the wave motion
16.
b) Light
The light wave has a longer wave length. Because, it has much greater speed.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
