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

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 9 Science book Chapter 12 Sound with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 9 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Sound. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 9 free Pdf and prepare to exam and help students understand the concept very well.

(i) v = λυ
(ii) υ = λv
(iii) λ = υv
(iv) v = λ\υ

(i) v = λυ

## Q2. On increasing the temperature, the speed of sound in air:

(i) Increases
(ii) Decreases
(iii) Does not change
(iv) First increases then becomes constant

(i) Increases

## Q3. Note is a sound

(i) of mixture of several frequencies
(ii) of mixture of two frequencies only
(iii) of a single frequency
(iv) always unpleasant to listen

(iii) of a single frequency

## Q4. The upper frequency limit of the audible range of human hearing is about

(i) 20 kHz
(ii) 2000 Hz
(iii) 2 kHz
(iv) 2,000,000 Hz

(i) 20 kHz

## Q5. Which of the following vibrates when a musical note is produced by the cymbals in an orchestra ?

(i) stretched strings
(ii) stretched membranes
(iii) metal plates
(iv) air columns

(iii) metal plates

## Q6. The speed of sound is maximum in:

(i) solids
(ii) liquids
(iii) gases
(iv) All of these

(i) solids

### Q7. Which of the following can produce longitudinal as well as transverse waves under different conditions?

(i) Bats
(iii) Tuning fork
(iv) None of these

## Q8. In SONAR, we use

(i) ultrasonic waves
(ii) infrasonic waves
(iv) audible sound waves

x

## Q9. Sound wave is a

(i) transverse wave
(ii) longitudinal wave
(iii) both a and b
(iv) None of these

(ii) longitudinal wave

## Q10. Which one of the following does not consist of transverse waves ?

(i) light emitted by a CFL
(ii) TV signals from a satellite
(iii) ripples on the surface of a pond
(iv) musical notes of an orchestra

(iv) musical notes of an orchestra

(i) 0 dB
(ii) 10 dB
(iii) 60 dB
(iv) 120 dB

(iv) 120 dB

(i) 20 m
(ii) 0.2 m
(iii) 200 m
(iv) 2 m

(ii) 0.2 m

(i) frequency
(ii) amplitude
(iii) velocity
(iv) wavelength

(ii) amplitude

## Q14. Sound travels

(i) slower in warm air than in cold air
(ii) faster in solids and liquids than in air
(iii) slower in water than air
(iv) none of these

(ii) faster in solids and liquids than in air

## Q15. The maximum speed of vibrations which produce audible sound will be in :

(i) dry air
(ii) sea water
(iii) ground glass
(iv) human blood

(iii) ground glass

## Q16. An earthquake produces which kind of sound before the mainshock wave begins:

(i) ultrasound
(ii) infrasound
(iii) audible sound
(iv) None of the above

(ii) infrasound

## Q17. Earthquake produces which kind of sound before the main shock wave begins

(i) ultrasound
(ii) infrasound
(iii) audible sound
(iv) none of the above

(i) ultrasound

## Q18. Sound can travel through

(i) gases only
(ii) vacuum only
(iii) gases and liquids only
(iv) solids, liquids and gases.

(iv) solids, liquids and gases.

### Q19. When the pitch of note produced by a harmonium is lowered, then the wavelength of the note :

(i) decreases
(ii) first decreases and then increases
(iii) increases
(iv) remains the same

(iii) increases

## Q20. The transfer of energy in a material medium due to the periodic motion of its particles is called:

(i) Wave front
(ii) Wave motion
(iii) Pulse
(iv) None of the above

(ii) Wave motion

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