Sound Test

Sound

This is Sound Test-02 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Statement A: Speed of sound is same at different temperature Statement B: Loudness is measured in decibels. Which of the two statements is true?
  • A
    Statement A
  • B
    Both a and b
  • C
    Statement B
    Correct
  • D
    None of these
2
Frequency of infrasonic waves is ____________ than frequency of ultrasound waves.
  • A
    less
    Correct
  • B
    none of these.
  • C
    more
  • D
    almost same
3
The velocity, wavelength and time period of a wave are related as
  • A
    none of these
  • B
    \(V = \lambda T\)
  • C
    \(T = \frac{\lambda }{V}\)
  • D
    \(V = \frac{\lambda }{T}\)
    Correct
4
The upper limit of frequency of sound waves audible to human beings are
  • A
    5Hz
  • B
    20Hz
  • C
    20,000Hz
    Correct
  • D
    35,000Hz.
5
The distance between a consecutive crest and trough is x. The wavelength of the wave is
  • A
    \(\frac{x}{2}\)
  • B
    \(x\)
  • C
    \(4x{\text{ }}\)
  • D
    2x
    Correct
6
Children can hear sound of frequency up to
  • A
    20,000Hz
  • B
    20Hz
  • C
    30,000Hz
  • D
    25,000
    Correct
7
A wave moves a distance of 10m in 0.05 second. Find the wavelength of the wave if frequency is 200Hz?
  • A
    0.5m
  • B
    0.8M
  • C
    1m
    Correct
  • D
    0./m
8
Statement A: Speeds greater than the speed of sound in air are called infrasonic speed. Statement B: the amount of sound energy, passing each second through unit area is called intensity of sound. Which of the above two statement is true
  • A
    Statement B
    Correct
  • B
    Both a and b
  • C
    Statement A
  • D
    neither a or b.
9
The frequency of a source on sound is 546 Hz. It vibrates ___________ times in a second
  • A
    223
  • B
    \(\frac{1}{{546}}\)
  • C
    1092
  • D
    546
    Correct
10
A sound wave travels at a speed of\({\text{344m}}{{\text{S}}^{ - {\text{1}}}}\). If its wavelength is 0.02m, what is the frequency of wave?
  • A
    1700Hz
  • B
    17820Hz
  • C
    none of these.
  • D
11
Which of the following condition is not favourable for producing higher pitch?
  • A
    Vibrating string should be thick.
    Correct
  • B
    Length of the vibrating portion should be small.
  • C
    Length of the vibrating column should be shorter.
  • D
    Vibrating string should be very thin
12
The frequency of sound is 100 Hz. How many times does it vibrate in a minute?
  • A
    6000Hz
    Correct
  • B
    5000Hz
  • C
    60Hz
  • D
    600Hz
13
Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440m/s in a given medium.
  • A
    8m
  • B
    0.5m
  • C
    2m
    Correct
  • D
    4m
14
Statement A: Sound travel faster in summer season than in winter season Statement B: Speed of sound does not depend on the pressure of the medium. If temperature of the medium remains constant Which of the two statement is true
  • A
    Neither a or b.
  • B
    Statement B
  • C
    both a and b
    Correct
  • D
    Statement A
15
Match the following with correct response. (1) Amplitude (2) Time period (3) Frequency (4) Velocity (A) Duration to complete one oscillation (B) Distance covered by sound in unit time (C) Number of oscillation in one second (D) Maximum displacement from mean position
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-D, 2-A, 3-C, 4-B
    Correct
  • C
    1-C, 2-B, 3-D, 4-A
  • D
    1-B, 2-D, 3-A, 4-C