Sound Test

Sound

This is Sound Test-03 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Match the following with correct response. (1) Speed of sound in Aluminium (2) Speed of sound in water (3) Speed of sound in air at \(25^\circ C\)(4) Speed of sound in oxygen gas (A) 328 m/s (B) 1520 m/s (C) 6420 m/s (D) 347 m/s
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-C, 2-B, 3-D, 4-A
    Correct
  • D
    1-D, 2-A, 3-C, 4-B
2
Which of the following is correct- A \(V = \frac{\lambda }{t}\) B \(V = \lambda T\) C \(V = v\lambda \) D \(V = \frac{1}{T}\)
  • A
    All of these
  • B
    (a), (b) and (d) are correct
    Correct
  • C
    (a) and (b) are correct
  • D
    (b) and (c) are correct
3
“Due to the high power of ultrasound waves. It is used for breaking and cutting objects” The above statement is
  • A
    Partially True
  • B
    False
  • C
    True
    Correct
  • D
    Partially false.
4
Statement A: Human beings are ultrasound deaf Statement B: Ultrasonic waves can travel easily in solid, liquid and gases. Which of the two statements is true?
  • A
    Statement B
  • B
    Statement A
    Correct
  • C
    both a and b
  • D
    none of the two
5
Match the following with correct response. (1) Laws of reflection of sound (2) An application of multiple reflection of sound (3) Ultrasound (4) SONAR (A) Megaphone (B) Measures Depth of the sea (C) To monitor foetus inside mother’s womb (D) Angle of reflection is equal to angle of incidence
  • A
    1-C, 2-B, 3-D, 4-A
  • B
    1-D, 2-A, 3-C, 4-B
    Correct
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-A, 2-C, 3-B, 4-D
6
Ultra sound is produced by A Tortoise B Bats C Dolphins D Dogs
  • A
    (a), (b) and (c) are correct
    Correct
  • B
    (b) and (c) are correct
  • C
    (a) and (b) are correct
  • D
    All of these
7
A bat hears the echo of its squeak after 0.1 second. How far is the obstacle from the bat? Speed of sound is 344 m/s.
  • A
    18m
  • B
    180m
  • C
    170m
  • D
    17.2m
    Correct
8
Sonar stands for ______
  • A
    Sound notation and ranging
  • B
    None of these.
  • C
    Sound native and ranging
  • D
    Sound navigation and ranging
    Correct
9
The multiple reflection of sound in a hall is called
  • A
    All of these
  • B
    Scanning
  • C
    Echo
  • D
    reverberation
    Correct
10
Statement A: Porpoises use ultrasound for navigation and location of food in dark Statement B: When you listen to music or watch TV at home, the noise level is 100-120 decibels. Which of the two statements is true
  • A
    Statement A
    Correct
  • B
    Statement B
  • C
    Neither a or b.
  • D
    both a and b
11
‘The angle of incidence is equal to the angle of reflection’ is one of the law of reflection of
  • A
    Sound waves
  • B
    both a and b
    Correct
  • C
    Light waves
  • D
    Magnetic waves.
12
The good directional property of ultrasound waves are used for
  • A
    Scanning
    Correct
  • B
    none of these
  • C
    both a and b
  • D
    Echoing
13
A person clapped his hands near a cliff and heard the echo after 5sec. What is the distance of the cliff from the person if the speed of the sound V is taken as 346\({\text{m}}{{\text{s}}^{ - {\text{1}}}}\)?
  • A
    865m
    Correct
  • B
    900m
  • C
    465m
  • D
    1050m
14
Which of the following statement is true?
  • A
    The frequency of man’s voice more than that of woman’s voice.
  • B
    both a and c
    Correct
  • C
    repeated claps of thunder in quick succession are called rolling of thunder
  • D
    Timbre is a typical feature of a sound which enables us to distinguish between the sounds of same loudness and pitch.
15
During a thunderstorm, one observes lightning first and then hears the thunder, though both occur simultaneously. This is be cause
  • A
    Light travels faster than sound
    Correct
  • B
    None of the above
  • C
    Eye cells are more active
  • D
    Both (a) and (b)