SOUND MCQs 12 min Score: 0 Attempted: 0/12 Subscribe 1. The velocity of sound in air at 0 Ā°C is: (A) 3 Ć 10āø m/s (B) 330 km/s (C) 3300 m/s (D) 331.3 m/s 2. Sound waves are: (A) Longitudinal waves (B) Transverse waves (C) Electromagnetic waves (D) Matter waves 3. The speed of sound is greatest in: (A) Iron (B) Water (C) Air (D) Vacuum 4. Unit of intensity level of sound is: (A) Graham Bel (B) Decibel (C) W/mĀ² (D) Hertz 5. Sounds of frequencies higher than 20,000 hertz are called: (A) Ultrasonic (B) Harmonic (C) Supersonic (D) Beats 6. The property or characteristic of sound by which a shrill sound can be distinguished from a grave one is called: (A) Pitch of sound (B) Intensity of sound (C) Wavelength of sound (D) Quality of sound 7. The unit of intensity of sound is: (A) watt/m (B) N/m (C) watt/mĀ² (D) Bell 8. Ear of normal human being responds to the frequencies of sound between: (A) 20 to 20,000 Hz (B) 20 to 2000 Hz (C) 20 to 200 Hz (D) 2000 to 30,000 Hz 9. For destructive interference of sound waves the condition for path difference is: (A) S = n Ī» (B) S = 2n Ī» (C) S = (2n + 1) Ī» (D) S = (2n + 1) Ī» / 2 10. Two tuning forks of frequencies 250 and 252 hertz are heard simultaneously. The number of beats will be: (A) 2 (B) 1 (C) 4 (D) 502 11. The change in the pitch of sound caused by the relative motion of either the source of sound or the listener is called the: (A) Dopplerās Effect (B) Beats (C) Echo (D) Acoustics 12. The relationship between velocity āVā, frequency āfā and wavelength āĪ»ā of a wave is: (A) f = V Ī» (B) V = f Ī» (C) Ī» = V f (D) V = f / Ī»
