Sound Test

Sound

This is Sound Test-04 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Principle of reflection of sound is used in

A
Megaphone
B
All of these
Correct
C
Stethoscope
D
Sound boards

Match the following with correct response. (1) Echo (2) Reverberation (3) SONAR (4) Sound board (A) Bouncing back of sound (B) Sound navigation & Ranging (C) Persistence of sound due to repeated reflection (D) Concave surface

A
1-A, 2-C, 3-B, 4-D
Correct
B
1-B, 2-D, 3-A, 4-C
C
1-D, 2-A, 3-C, 4-B
D
1-C, 2-B, 3-D, 4-A

Match the following with correct response. (1) Audible range (2) Infrasonic (3) Ultrasonic (4) Supersonic (A) Less than 20 Hz (B) Speed greater than sound in air (C) More than 20,000 Hz (D) 20 Hz to 20,000 Hz

A
1-D, 2-A, 3-C, 4-B
Correct
B
1-C, 2-B, 3-D, 4-A
C
1-A, 2-C, 3-B, 4-D
D
1-B, 2-D, 3-A, 4-C

An echo is heard when- A Minimum distance is 17m B Minimum time gap between two sounds is \(\frac{1}{{10th}}\)of second C Minimum distance is 18m D Minimum time gap between two sounds is \(\frac{1}{{100th}}\)of second

A
(b) and (c) are correct
B
(a) and (b) are correct
Correct
C
All of these
D
(a), (b) and (c) are correct

The eardrum is a

A
bone
B
A stretched membrane.
Correct
C
fluid
D
coiled tube

Cochlea, semicircular canals and the auditory nerve are associated with

A
None of these
B
Middle ear
C
Inner ear
Correct
D
External ear

Wave motion is a periodic ____________ produced by a vibrating body.

A
Momentum
B
Disturbance
Correct
C
Energy
D
Energy

Statement A: Molecules also move from one place to another in wave motion. Statement B: Electromagnetic waves don’t need material medium to travel. Which of the two statement is true

A
Statement A
B
Statement B
Correct
C
Both a and b
D
Neither a or b.

Statement A: Molecules also move from one place to another in wave motion. Statement B: Electromagnetic waves don’t need material medium to travel. Which of the two statement is true

A
Neither a or b.
B
Both a and b
C
Statement A
D
Statement B
Correct

“In a human ear, the sound is amplified in the outer ear as well as in the middle ear because of which we are able to listen loud sound only the above statement is

A
False
Correct
B
Information irrelevant.
C
True
D
Partially false

Statement A: An object moving at a speed greater than that of a sound is moving at ultrasonic speed. Statement B: In a wave motion only energy is transferred formed. Which of the two statements is true?

A
both a and b
B
Statement B
Correct
C
Statement A
D
Neither a or b.

Match the following with correct response. (1) Crest (2) Trough(3) Compression (4) Refraction (A) Depression (B) Particles of the medium are farther (C) Particles of the medium are closer (D) Elevation

A
1-D, 2-A, 3-C, 4-B
Correct
B
1-B, 2-D, 3-A, 4-C
C
1-C, 2-B, 3-D, 4-A
D
1-A, 2-C, 3-B, 4-D

Match the following with correct response. (1) Loudness (2) Supersonic speed (3) Pitch (4) Timbre(A) Frequency (B) Amplitude (C) Distinguish two sounds (D) v

A
1-A, 2-C, 3-B, 4-D
B
1-C, 2-B, 3-D, 4-A
C
1-D, 2-A, 3-C, 4-B
D
1-B, 2-D, 3-A, 4-C
Correct

Match the following with correct response. (1) Sound waves (2) Radio waves (3) Supersonic jet (4) Mechanical waves (A) Longitudinal waves (B) Shock waves (C) Transverse waves (D) Elastic waves

A
1-A, 2-C, 3-B, 4-D
Correct
B
1-C, 2-B, 3-D, 4-A
C
1-B, 2-D, 3-A, 4-C
D
1-D, 2-A, 3-C, 4-B

Which of following is in correct- A Unit of frequency is hertz B Unit of wavelength is m/s C Unit of velocity is <tex>m/{s^2} D Unit of time period is second

A
(b) and (c) are correct
Correct
B
(a) and (b) are correct
C
All of these
D
(a), (b) and (c) are correct