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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Science Test1.
A strong sound signal is sent from a ship towards the bottom of the sea. It is received back after 1s. What is the depth of sea given that the speed of sound in water 1450 m s–1?
2.
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 second respectively. What is the speed of sound in the air?
3.
A person who is sitting at a distance of 400 m from a source of sound is listening to a sound of 600 Hz. Find the time period between successive compressions from the source?
4.
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.
5.
Explain why, the ceilings of concert halls are curved.
1.
Given:
t = 1s
v = 1450 ms-1
\(d = \frac{v\times t}{2}= \frac {1450 \times 1 }{ 2 } \)
d = 725 m
2.
d = 680 m
t = 1.1 + 0.9 = 2, c = ?
\(d=\frac { ct }{2} \)
c = \(\frac { 2 \times d }{ t } \)
\(c=\frac { 2\times 680 }{ 2 } \)
c = 340 ms-1 which is the speed of sound in air
3.
Given:
Frequency of sound, n = 600 Hz
T = ?
\(T = \frac{1}{n}\)
\(=\frac{1}{600}=0.0016 \ s\)
(or)
T = 1.6 ms
4.
Given:
n = 200 Hz
v = 400 ms-1
λ = ?
V = n x λ
\(λ= \frac { V }{ n } =\frac { 400 }{ 200 } \)
λ = 2m
5.
(i) When sound is reflected from a concave surface, the reflected waves are converged at a point.
(ii) So, the ceilings of the concrete wall is curved.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
