{"id":18118,"date":"2021-02-06T15:36:08","date_gmt":"2021-02-06T10:06:08","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=18118"},"modified":"2021-02-06T16:01:57","modified_gmt":"2021-02-06T10:31:57","slug":"mcq-questions-for-class-9-science-chapter-12","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-9-science-chapter-12\/","title":{"rendered":"MCQ Questions for Class 9 Science Chapter 12 Sound"},"content":{"rendered":"

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<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Sound Class 9 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Sound Class 9 MCQs Questions with Answers<\/h2>\n

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.<\/p>\n

Multiple Choice Questions<\/span><\/p>\n

Question 1.
\nFor hearing a distinct sound, the time interval between the original sound and the reflected one must be at least:
\n(a) 1 s
\n(b) 0.1 s
\n(c) 2 s
\n(d) 0.2 s<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 0.1 s<\/p>\n<\/details>\n

\n

Question 2.
\nThe persistence of sound in an auditorium is the result of repeated reflections of sound and is called:
\n(a) reverberation
\n(b) audible
\n(c) distinct sound
\n(d) reflection<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) reverberation<\/p>\n<\/details>\n

\n

Question 3.
\nThe speed v, frequency \u03c5, and wavelength \u03bb, of sound are related by the equation:
\n(a) v = \u03bb\u03c5
\n(b) \u03c5 = \u03bbv
\n(c) \u03bb = \u03c5v
\n(d) v = \\(\\frac{\\lambda}{\u03c5}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) v = \u03bb\u03c5<\/p>\n<\/details>\n

\n

Question 4.
\nThe speed of sound is maximum in:
\n(a) solids
\n(b) liquids
\n(c) gases
\n(d) All of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) solids<\/p>\n<\/details>\n

\n

Question 5.
\nOur ears are sensitive to sound frequencies between:
\n(a) 20 Hz to 20 kHz
\n(b) 2 Hz to 20 Hz
\n(c) 20 kHz to 200 kHz
\n(d) 2000 kHz to 20000 kHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 20 Hz to 20 kHz<\/p>\n<\/details>\n

\n

Question 6.
\nWhich of the following waves are produced by bats?
\n(a) Infrasonic waves
\n(b) Ultrasonic waves
\n(c) Audible waves
\n(d) All of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Ultrasonic waves<\/p>\n<\/details>\n

\n

Question 7.
\nMaximum tolerable sound is:
\n(a) 0 dB
\n(b) 10 dB
\n(c) 60 dB
\n(d) 120 dB<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) 120 dB<\/p>\n<\/details>\n

\n

Question 8.
\nSound waves are:
\n(a) magnetic waves
\n(b) electric waves
\n(c) electromagnetic waves
\n(d) mechanical waves<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) mechanical waves<\/p>\n<\/details>\n

\n

Question 9.
\nIn SONAR, we use:
\n(a) ultrasonic waves
\n(b) infrasonic waves
\n(c) radio waves
\n(d) audible sound waves<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) ultrasonic waves<\/p>\n<\/details>\n

\n

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

\nAnswer<\/span><\/summary>\n

Answer: (c) disturbance moves<\/p>\n<\/details>\n

\n

Question 11.
\nWhen we change feeble sound to loud sound we increase its:
\n(a) frequency
\n(b) amplitude
\n(c) velocity
\n(d) wavelength<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) amplitude<\/p>\n<\/details>\n

\n

Question 12.
\nIn the curve half the wavelength is:
\n\"MCQ
\n(a) AB
\n(b) BD
\n(c) DE
\n(d) AE<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) BD<\/p>\n<\/details>\n

\n

Question 13.
\nAn earthquake produces which kind of sound before the mainshock wave begins:
\n(a) ultrasound
\n(b) infrasound
\n(c) audible sound
\n(d) None of the above<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) infrasound<\/p>\n<\/details>\n

\n

Question 14.
\nInfrasound can be heard by:
\n(a) dog
\n(b) bat
\n(c) rhinoceros
\n(d) human beings<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) rhinoceros<\/p>\n<\/details>\n

\n

Fill in the blanks.<\/span><\/p>\n

Question 15.
\nSound travels as a _______ wave through a material medium.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: longitudinal<\/p>\n<\/details>\n

\n

Question 16.
\nThe change in density from one maximum value to the minimum value and again to the maximum value makes one complete ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: oscillation<\/p>\n<\/details>\n

\n

Question 17.
\nSound waves with frequencies below the audible range are termed as ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: infrasonic<\/p>\n<\/details>\n

\n

Question 18.
\nSound waves with frequencies above the audible range are termed as ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: ultrasonic<\/p>\n<\/details>\n

\n

Question 19.
\n________ is produced due to reflections of sound from obstacles.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Echo<\/p>\n<\/details>\n

\n

Question 20.
\nWave velocity = Frequency \u00d7 ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: wavelength<\/p>\n<\/details>\n

\n

Question 21.
\nSound frequencies greater than 20,000 Hz are known as ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: ultrasonic sound<\/p>\n<\/details>\n

\n

Question 22.
\nEcho can be heard clearly if the minimum distance between the source of the sound and the obstacle is ________<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 17.2 meter<\/p>\n<\/details>\n

\n

Question 23.
\nEcho is produced due to _______ of sound from obstacles.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: reflection<\/p>\n<\/details>\n

\n

True\/False.<\/span><\/p>\n

Question 24.
\nSound is produced due to the vibration of different objects.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 25.
\nSound travels as successive compressions and rarefactions in the medium.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 26.
\nIn sound propagation, it is the energy of the sound that travels and not the particles of the medium.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 27.
\nSound propagates in a vacuum.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: False<\/p>\n<\/details>\n

\n

Question 28.
\nThe speed of sound does not depend primarily on the nature and the temperature of the transmitting medium.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: False<\/p>\n<\/details>\n

\n

Question 29.
\nLoudness is a physiological response of the ear to the intensity of sound.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 30.
\nThe audible range of hearing for average human beings is in the frequency range of 20Hz – 20kHz.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 31.
\nSound frequencies above 20 Hz are known as inaudible sound.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: False<\/p>\n<\/details>\n

\n

Question 32.
\nRhino can hear the sound frequency of 5 Hz.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 33.
\nSONAR is used to determine the depth of the sea.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Question 34.
\nThe transverse and longitudinal waves are called progressive waves.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: True<\/p>\n<\/details>\n

\n

Match the Column.<\/span><\/p>\n

Question 35.<\/p>\n\n\n\n\n\n\n\n\n\n
A<\/td>\nB<\/td>\n<\/tr>\n
1. Frequency below 20 Hz<\/td>\n(i) 120 dB<\/td>\n<\/tr>\n
2. Heartbeat<\/td>\n(ii) Audible sounds<\/td>\n<\/tr>\n
3. Maximum tolerable sound<\/td>\n(iii) Infrasonic sounds<\/td>\n<\/tr>\n
4. Frequency of 20 Hz to 20,000 Hz<\/td>\n(iv) Stethoscope<\/td>\n<\/tr>\n
5. Uses of SONAR<\/td>\n(v) Decibel<\/td>\n<\/tr>\n
6. The unit of intensity of sound<\/td>\n(vi) Depth of sea<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\nAnswer<\/span><\/summary>\n

Answer:<\/p>\n\n\n\n\n\n\n\n\n\n
A<\/td>\nB<\/td>\n<\/tr>\n
1. Frequency below 20 Hz<\/td>\n(iii) Infrasonic sounds<\/td>\n<\/tr>\n
2. Heartbeat<\/td>\n(iv) Stethoscope<\/td>\n<\/tr>\n
3. Maximum tolerable sound<\/td>\n(i) 120 dB<\/td>\n<\/tr>\n
4. Frequency of 20 Hz to 20,000 Hz<\/td>\n(ii) Audible sounds<\/td>\n<\/tr>\n
5. Uses of SONAR<\/td>\n(vi) Depth of sea<\/td>\n<\/tr>\n
6. The unit of intensity of sound<\/td>\n(v) Decibel<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/details>\n
\n

Answer in Word\/Sentence.<\/span><\/p>\n

Question 36.
\nWhat is the term given to the distance between two consecutive compression or two consecutive rarefactions?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Wavelength (\u03bb)<\/p>\n<\/details>\n

\n

Question 37.
\nWhat is the term given to the time taken by the wave for one complete oscillation of the density of the medium?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Time Period (T)<\/p>\n<\/details>\n

\n

Question 38.
\nWhat is the amount of sound energy passing each second through the unit area?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: The intensity of sound<\/p>\n<\/details>\n

\n

Question 39.
\nWhich technique is used to locate underwater hills, valleys, submarines, icebergs, sunken ships, etc.?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: The SONAR<\/p>\n<\/details>\n

\n

Question 40.
\nWhat type of mechanical waves are produced in the air (gases)?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Longitudinal waves<\/p>\n<\/details>\n

\n

Question 41.
\nWhat type of mechanical waves are produced on the surface of the water?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Transverse waves<\/p>\n<\/details>\n

\n

Question 42.
\nWhat type of waves are sound waves?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Longitudinal mechanical waves<\/p>\n<\/details>\n

\n

Question 43.
\nWhat type of waves are produced by the bats while flying?<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Ultrasound waves<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 9 Science Sound MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"

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 …<\/p>\n

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MCQ Questions for Class 9 Science with Answers are prepared as per the Latest Exam Pattern. 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