1. . The velocity of sound in air at 0°C is:
(A) 3 × 10⁸ m/s
(B) 330 km/s
(C) 331.3 m/s
(D) 3300 m/s
2. . Sound waves are:
(A) Transverse waves
(B) Longitudinal 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 Bell
(B) Hertz
(C) W/m²
(D) Decibel
5. . Sounds of frequencies higher than 20,000 Hz are called:
(A) Harmonic
(B) Ultrasonic
(C) Supersonic
(D) Beats
6. . The property of sound by which a shrill sound can be distinguished from a grave one is called:
(A) Pitch of sound
(B) Quality of sound
(C) Wavelength of sound
(D) Intensity of sound
7. . The unit of intensity of sound is:
(A) watt/m
(B) watt/m²
(C) N/m
(D) Bell
8. . Ear of a normal human being responds to frequencies between:
(A) 20 to 200 Hz
(B) 20 to 2000 Hz
(C) 20 to 20,000 Hz
(D) 2000 to 30,000 Hz
9. . For destructive interference of sound waves, the condition for path difference is:
(A) S = nλ
(B) S = 2nλ
(C) S = (2n + 1)λ
(D) S = (2n + 1)λ / 2
10. . Two tuning forks of frequencies 250 Hz and 252 Hz are sounded together. The number of beats produced is:
(A) 1
(B) 2
(C) 4
(D) 502
11. . The change in pitch due to relative motion between source and listener is called:
(A) Doppler’s Effect
(B) Beats
(C) Echo
(D) Acoustics