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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
(c) radio waves
(d) audible sound waves
Answer: (c) radio 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
Answer: (b) amplitude
Question 6.
In the curve half the wavelength is
(a) AB
(b) BD
(c) DE
(d) AE
Answer: (b) BD
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
Answer: (a) ultrasound
Question 8.
Infrasound can be heard by
(a) dog
(b) bat
(c) rhinoceros
(d) human beings
Answer: (c) rhinoceros
Question 9.
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
(a) intensity of sound only
(b) amplitude of sound only
(c) frequency of the sitar string with the frequency of other musical instruments
(d) loudness of sound
Answer: (c) frequency of the sitar string with the frequency of other musical instruments
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