## Class 9 Science MCQ Questions for Chapter 12 Sound with Answers

We have compiled the MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download covering the entire syllabus for CBSE Class 9 Science. Practice MCQ Questions for Class 9 Science with Answers on a daily basis and score well in exams. Refer to the Sound Class 9 MCQs Quiz Questions with Answers here along with a detailed explanation.

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# MCQ Questions for Class 9 Science Chapter 12 Sound with Answers

MCQ Questions for Class 9 Science Chapter 12 Sound with Answers

Question 1.
Note is a sound
(a) of mixture of several frequencies
(b) of mixture of two frequencies only
(c) of a single frequency
(d) always unpleasant to listen

Answer: (c) of a single frequency

Question 2.
A key of a mechanical piano struck gently and then struck again but mush harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected

Answer: (a) sound will be louder but pitch will not be different

Question 3.
In SONAR, we use
(a) ultrasonic waves
(b) infrasonic waves
(d) audible sound waves

Question 4.
Sound travels in air if
(а) particles of medium travel from one place to another
(b) there is no moisture in the atmosphere
(c) disturbance moves
(d) both particles as well as disturbance travel from one place to another.

Answer: (d) both particles as well as disturbance travel from one place to another.

Question 5.
When we change feeble sound to loud sound we increase its
(a) frequency
(b) amplitude
(c) velocity
(d) wavelength

Question 6.
In the curve half the wavelength is

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

Question 7.
Earthquake produces which kind of sound before the main shock wave begins
(a) ultrasound
(b) infrasound
(c) audible sound
(d) none of the above

Question 8.
Infrasound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings