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

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## Q1. The transfer of energy in a material medium due to the periodic motion of its particles is called:

(A) Wave front
(B) Wave motion
(C) Pulse
(D) None of the above

(A) v = λυ
(B) υ = λv
(C) λ = υv
(D) v = λ\υ

## Q3. When the pitch of note produced by a harmonium is lowered, then the wavelength of the note :

(A) decreases
(B) first decreases and then increases
(C) increases
(D) remains the same

## Q4. On increasing the temperature, the speed of sound in air:

(A) Increases
(B) Decreases
(C) Does not change
(D) First increases then becomes constant

## Q5. Sound can travel through

(A) gases only
(B) vacuum only
(C) gases and liquids only
(D) solids, liquids and gases.

## Q6. 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

## Q7. Earthquake produces which kind of sound before the main shock wave begins

(A) ultrasound
(B) infrasound
(C) audible sound
(D) none of the above

(A) 20 kHz
(B) 2000 Hz
(C) 2 kHz
(D) 2,000,000 Hz

## Q9. An earthquake produces which kind of sound before the mainshock wave begins:

(A) ultrasound
(B) infrasound
(C) audible sound
(D) None of the above

## Q10. Which of the following vibrates when a musical note is produced by the cymbals in an orchestra ?

(A) stretched strings
(B) stretched membranes
(C) metal plates
(D) air columns

(A) dry air
(B) sea water
(C) ground glass
(D) human blood

## Q12. Which of the following can produce longitudinal as well as transverse waves under different conditions?

(A) Bats
(C) Tuning fork
(D) None of these

## Q13. Sound travels

(A) slower in warm air than in cold air
(B) faster in solids and liquids than in air
(C) slower in water than air
(D) none of these

## Q14. Sound wave is a

(A) transverse wave
(B) longitudinal wave
(C) both a and b
(D) None of these

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