Question

Mulple choice questions on reflection of soun waves

Answer 1

1) Sound in air propagates in the form of :
(i) longitudinal wave
(ii) transverse wave
(iii) Both of these
(iv) None of these
[ANSWER : Option (i)]

2) The speed of sound in air at 0℃ is nearly
(i) 1450 m/s
(ii) 450 m/s
(iii) 5100 m/s
(iv) 330 m/s
[ANSWER : Option (iv)]

3) The speed of light in air (in m/s) is :
(i) 3×10^8
(ii) 330
(iii) 5100
(iv) 3×10^10
[ANSWER : Option (i)]

4) A man can hear the sound of frequency :
(i) 1 Hz
(ii) 1000 Hz
(iii) 200 kHz
(iv) 5 MHz
[ANSWER : Option (ii)]

5) The properties of ultrasound that make it useful are :
(i) high power & high speed
(ii) high power & good directivity
(iii) high frequency and high speed
(iv) high frequency and bending around the objects
[ANSWER : Option (ii)]

6) SONAR makes use of :
(i) Infrasonic sound
(ii) ultrasound
(iii) ordinary sound
(iv) light
[ANSWER : Option (ii)]

7) Factors affecting the speed of sound in a gas are :
(i) Density
(ii) Temperature
(iii) Humidity
(iv) All of these
[ANSWER : Option (iv)]

8) Which of the following factors do not affect the speed of sound in a gas ?
(i) Wavelength of sound wave
(ii) Amplitude of sound wave
(iii) Both (i) & (ii)
(iv) None of these
[ANSWER : Option (iii)]