Sound Class 9 MCQ Questions With Answers CBSE

NCERT Class 9 Science Chapter 12 MCQs Questions With Answers

Students are advised to practice the NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download is available here. MCQ Questions for Class 9 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Sound Class 9 MCQs Questions with Answers and assess their preparation level.

Sound Class 9 MCQ

Solving the Sound Multiple Choice Questions of Class 9 Science Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Sound Class 9 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 12 Science Class 9 and cross-check your answers during preparation.

Multiple Choice Questions

Question 1.
For hearing a distinct sound, the time interval between the original sound and the reflected one must be at least:
(a) 1 s
(b) 0.1 s
(c) 2 s
(d) 0.2 s

Question 2.
The persistence of sound in an auditorium is the result of repeated reflections of sound and is called:
(a) reverberation
(b) audible
(c) distinct sound
(d) reflection

Question 3.
The speed v, frequency υ, and wavelength λ, of sound are related by the equation:
(a) v = λυ
(b) υ = λv
(c) λ = υv
(d) v = $$\frac{\lambda}{υ}$$

Question 4.
The speed of sound is maximum in:
(a) solids
(b) liquids
(c) gases
(d) All of these

Question 5.
Our ears are sensitive to sound frequencies between:
(a) 20 Hz to 20 kHz
(b) 2 Hz to 20 Hz
(c) 20 kHz to 200 kHz
(d) 2000 kHz to 20000 kHz

Answer: (a) 20 Hz to 20 kHz

Question 6.
Which of the following waves are produced by bats?
(a) Infrasonic waves
(b) Ultrasonic waves
(c) Audible waves
(d) All of these

Question 7.
Maximum tolerable sound is:
(a) 0 dB
(b) 10 dB
(c) 60 dB
(d) 120 dB

Question 8.
Sound waves are:
(a) magnetic waves
(b) electric waves
(c) electromagnetic waves
(d) mechanical waves

Question 9.
In SONAR, we use:
(a) ultrasonic waves
(b) infrasonic waves
(d) audible sound waves

Question 10.
Sound travels in the air if:
(a) particles of medium travel from one place to another
(b) there is no mixture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another

Question 11.
When we change feeble sound to loud sound we increase its:
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength

Question 12.
In the curve half the wavelength is:

(a) AB
(b) BD
(c) DE
(d) AE

Question 13.
An earthquake produces which kind of sound before the mainshock wave begins:
(a) ultrasound
(b) infrasound
(c) audible sound
(d) None of the above

Question 14.
Infrasound can be heard by:
(a) dog
(b) bat
(c) rhinoceros
(d) human beings

Fill in the blanks.

Question 15.
Sound travels as a _______ wave through a material medium.

Question 16.
The change in density from one maximum value to the minimum value and again to the maximum value makes one complete ________

Question 17.
Sound waves with frequencies below the audible range are termed as ________

Question 18.
Sound waves with frequencies above the audible range are termed as ________

Question 19.
________ is produced due to reflections of sound from obstacles.

Question 20.
Wave velocity = Frequency × ________

Question 21.
Sound frequencies greater than 20,000 Hz are known as ________

Question 22.
Echo can be heard clearly if the minimum distance between the source of the sound and the obstacle is ________

Question 23.
Echo is produced due to _______ of sound from obstacles.

True/False.

Question 24.
Sound is produced due to the vibration of different objects.

Question 25.
Sound travels as successive compressions and rarefactions in the medium.

Question 26.
In sound propagation, it is the energy of the sound that travels and not the particles of the medium.

Question 27.
Sound propagates in a vacuum.

Question 28.
The speed of sound does not depend primarily on the nature and the temperature of the transmitting medium.

Question 29.
Loudness is a physiological response of the ear to the intensity of sound.

Question 30.
The audible range of hearing for average human beings is in the frequency range of 20Hz – 20kHz.

Question 31.
Sound frequencies above 20 Hz are known as inaudible sound.

Question 32.
Rhino can hear the sound frequency of 5 Hz.

Question 33.
SONAR is used to determine the depth of the sea.

Question 34.
The transverse and longitudinal waves are called progressive waves.

Match the Column.

Question 35.

 A B 1. Frequency below 20 Hz (i) 120 dB 2. Heartbeat (ii) Audible sounds 3. Maximum tolerable sound (iii) Infrasonic sounds 4. Frequency of 20 Hz to 20,000 Hz (iv) Stethoscope 5. Uses of SONAR (v) Decibel 6. The unit of intensity of sound (vi) Depth of sea

 A B 1. Frequency below 20 Hz (iii) Infrasonic sounds 2. Heartbeat (iv) Stethoscope 3. Maximum tolerable sound (i) 120 dB 4. Frequency of 20 Hz to 20,000 Hz (ii) Audible sounds 5. Uses of SONAR (vi) Depth of sea 6. The unit of intensity of sound (v) Decibel

Question 36.
What is the term given to the distance between two consecutive compression or two consecutive rarefactions?

Question 37.
What is the term given to the time taken by the wave for one complete oscillation of the density of the medium?

Question 38.
What is the amount of sound energy passing each second through the unit area?

Question 39.
Which technique is used to locate underwater hills, valleys, submarines, icebergs, sunken ships, etc.?

Question 40.
What type of mechanical waves are produced in the air (gases)?

Question 41.
What type of mechanical waves are produced on the surface of the water?

Question 42.
What type of waves are sound waves?