Practice Questions with Answers - Multiple Choice Questions

# MCQ Questions for Class 9 Science Chapter 12 Sound

## MCQ Questions for Class 9 Science Chapter 12 Sound

Multiple Choice Questions

Question 1.
For hearing a distinct sound, the time interval between the original sound and the reflected one must be at least:
(a) 1 s
(b) 0.1 s
(c) 2 s
(d) 0.2 s

Question 2.
The persistence of sound in an auditorium is the result of repeated reflections of sound and is called:
(a) reverberation
(b) audible
(c) distinct sound
(d) reflection

Question 3.
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 = $$\frac{\lambda}{υ}$$

Question 4.
The speed of sound is maximum in:
(a) solids
(b) liquids
(c) gases
(d) All of these

Question 5.
Our ears are sensitive to sound frequencies between:
(a) 20 Hz to 20 kHz
(b) 2 Hz to 20 Hz
(c) 20 kHz to 200 kHz
(d) 2000 kHz to 20000 kHz

Answer: (a) 20 Hz to 20 kHz

Question 6.
Which of the following waves are produced by bats?
(a) Infrasonic waves
(b) Ultrasonic waves
(c) Audible waves
(d) All of these

Question 7.
Maximum tolerable sound is:
(a) 0 dB
(b) 10 dB
(c) 60 dB
(d) 120 dB

Question 8.
Sound waves are:
(a) magnetic waves
(b) electric waves
(c) electromagnetic waves
(d) mechanical waves

Question 9.
In SONAR, we use:
(a) ultrasonic waves
(b) infrasonic waves
(d) audible sound waves