Sound Test

Sound

This is Sound Test-01 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Crests and troughs are formed in
  • A
    Transverse wave
    Correct
  • B
    None of these.
  • C
    both a and b
  • D
    Longitudinal wave
2
X – rays, light rays are electromagnetic waves is a
  • A
    False statement
  • B
    Partially false
  • C
    True statement
    Correct
  • D
    Partially True
3
Sound wave is a
  • A
    transverse wave
  • B
    longitudinal wave
    Correct
  • C
    both a and b
  • D
    None of these.
4
The maximum displacement of the particle of the mean from its mean position is called the
  • A
    Amplitude
    Correct
  • B
    none of these
  • C
    wave number
  • D
    wavelength
5
Which wave property determines loudness?
  • A
    frequency
  • B
    amplitude
    Correct
  • C
    pitch
  • D
    All of these
6
A source produces 20 crests and 20 troughs in 0.2 second. Find the frequency of the wave.
  • A
    150Hz
  • B
    1Hz
  • C
    100Hz
    Correct
  • D
    200Hz
7
“Wave motion shifts mass from one region to another” The above statement is
  • A
    Partially false.
  • B
    Partially true
  • C
    True
  • D
    False
    Correct
8
Calculate the wavelength of a sound wave whose frequency is 820Hz and speed is 440m/s in a given medium.
  • A
    0.57
  • B
    0.53
    Correct
  • C
    0.50
  • D
    0.55
9
A boat at anchor is rocked by waves whose consecutive crests are 100m apart. The wave velocity of the moving crests is 20m|s. What is the frequency of rocking of the boat?
  • A
    0.1Hz
  • B
    0.4Hz
  • C
    0.2Hz
    Correct
  • D
    0.3Hz
10
Find the incorrect statement,
  • A
    Ultrasound is produced by electronic oscillator.
  • B
    The speed of the wave doesn’t depend on properties of the medium.
    Correct
  • C
    120. dB means intensity is \({\text{1W/}}{{\text{m}}^{\text{2}}}\)
  • D
    The distance between crest and trough is \(\lambda\)/2
11
In which of the following speed of sound is maximum?
  • A
    Helium
  • B
    Water
  • C
    Aluminium
    Correct
  • D
    Air
12
Hertz is a unit of
  • A
    Frequency
    Correct
  • B
    Time period
  • C
    Amplitude
  • D
    Loudness
13
Match the following with correct response. (1) A moving disturbance (2) Propagation require material medium (3) Particles vibrates perpendicular to the (4) Back and forth motion (A) Mechanical waves (B) Oscillatory motion (C) Transverse waves direction of wave propagation (D) Wave
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-B, 2-D, 3-A, 4-C
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
14
Longitudinal waves are produced in- A Solids and liquids B Gases C Insolids and liquids only D In solids and gases only
  • A
    (b) and (c) are correct
  • B
    (a) and (b) are correct
    Correct
  • C
    (a), (b) and (c) are correct
  • D
    All of these
15
Which of the following does not require medium for propagation- A Sound waves B Light waves C Radio waves D Water waves
  • A
    All of these
  • B
    (a), (b) and (c) are correct
  • C
    (a) and (b) are correct
  • D
    (b) and (c) are correct
    Correct