Students of class 9 Science should refer to MCQ Questions Class 9 Science Sound with answers provided here which is an important chapter in Class 9 Science NCERT textbook. These Multiple Choice Questions have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 9 Science. The following MCQs can help you to practice and get better marks in the upcoming class 9 Science examination

Question. Sound waves can not pass through–
(A) A solid liquid mixture
(B) A liquid gas mixture
(C) An ideal gas
(D) A perfect vaccum

Question. The equipment (device) used for locating the position and distance of an object inside sea, using ultrasound is called–
(A) Pukar
(B) Upkar
(C) Radar
(D) Sonar

Question. Human ear can hear–
(A) audible sound
(B) infra sound
(C) ultra sound
(D) all the above

Question. In which medium sound travels faster–
(A) solid
(B) liquid
(C) gas
(D) none of these

Question. A periodic wave is characterized by–
(A) Phase only
(B) Wavelength only
(C) Frequency only
(D) All the above

Question. The unit of quantity on which pitch of the sound depends is–
(A) Hertz
(B) metre
(C) metre/second
(D) second

Question. A sound wave travels from east to west, in which direction do the particles of air move–
(A) East-west
(B) North-south
(C) Up and down
(D) None of theseV

Question. Voice of a friend is recognised by its–
(A) pitch
(B) quality
(C) intensity
(D) velocity

Question. The unit of quantity on which loudness of sound depends is–
(A) metre
(B) Hertz
(C) metre/second
(D) second

Question. Sound waves in air are–
(A) longitudinal waves
(B) Radio waves
(C) Transverse waves
(D) Electromagnetic waves

Question. The speed of sound is maximum in–
(A) Air
(B) Hydrogen
(C) Water
(D) Iron

Question. Ultrasonic frequency range is–
(A) below 20 Hz
(B) 20 Hz to 20 kHz
(C) Above 20 kHz
(D) No limit

Question. When sound waves travelling in air enter into the medium of water, the quantity which remains unchanged is–
(A) Wavelength
(B) Velocity
(C) Frequency
(D) None

Question. The speed of sound in air at constanttemperature–
(A) Decreases with increase of pressure
(B) Increases with increase of pressure
(C) Remains the same with the increase in pressure
(D) None of these

Question. For the echo of the last syllable of the speech to be heard the least distance of the reflector must be (approximately)–
(A) 22 metre
(B) 32 metre
(C) 110 metre
(D) 340 metre

Question. The part of the ear, that is filled with a liquid is the –
(A) cochlea
(B) ear canal
(C) anril
(D) hammer

Question. With the rise of temperature, the velocity of sound–
(A) Decreases
(B) Increases
(C) Remains the same
(D) Is independent of temperature

Question. A fishing boat sonar detects a shoal of fish 190 m below it. How much time elapsed between sending the ultra sonic signal which detected the fish and receiving the signals echo ? (speed of sound in sea water is 1519 ms–1)–
(A) 0.25 s
(B) 0.50 s
(C) 0.75 s
(D) 1.0 s

Question. Infrasonic frequency range is–
(A) below 20 Hz
(B) 20 Hz to 20 kHz
(C) Above 20 kHz
(D) No limit

Question. The frequency of sound waves in water is –
(A) Same as that of frequency of source
(B) Less than frequency of source
(C) More than frequency of source
(D) None

Question. What is the name of short duration wave–
(A) Pulse
(B) Frequency
(C) Time period
(D) Velocity

Question. The eardrum is a–
(A) bone
(B) coiled tube
(C) stretched membrane
(D) fluid

Question. Nature of sound wave is–
(A) transverse
(B) longitudinal
(C) electromagnetic
(D) seismve

Question. Pitch of high frequency sound is–
(A) high
(B) low
(C) zero
(D) infinite

Question. What is the velocity of sound in water at room temperature–
(A) 1500 m/s
(B) 330 m/s
(C) 1500 km/s
(D) 330 km/s

Question. A sonar echo takes 4.4s to return from a submarine. If the speed of sound in water is 1500 ms–1, then the distance of submarine from the sonar is-
(A) 1500 m
(B) 3000 m
(C) 3300 m
(D) 3600 m

Question. During summer, an echo is heard–
(A) Sooner than during winter
(B) Later than during winter
(C) After same time as in winter
(D) Rarely

Question. The velocity of sound in air at 30°C is approximately–
(A) 332 ms–1
(B) 350 ms–1
(C) 530 ms–1
(D) 332 kms–1

We hope the above multiple choice questions for Class 9 Science for Chapter 12 Sound provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. Sound is an important chapter in Class 9 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for benefit of class 9 commerce students. Please go though these and let us know if you have any feedback in the comments section.