Sound MCQ Questions for Class 9 Science Chapter 12 with Answers

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All questions answers in the last paragraph

MCQ Questions for Class 9 Science with Answers Physics

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

Q2. The speed v, frequency υ, and wavelength λ, of sound are related by the equation:

(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

Q8. The upper frequency limit of the audible range of human hearing is about

(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

Q11. The maximum speed of vibrations which produce audible sound will be in :

(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
(B) Slinky
(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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All questions answers

QUESTIONS NO :	ANSWERS :
1	B
2	A
3	C
4	A
5	D
6	C
7	A
8	A
9	B
10	C
11	C
12	B
13	B
14	B