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 Bel
(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 or characteristic 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 normal human being responds to the frequencies of sound 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 and 252 Hz are heard simultaneously. The number of beats will be:
(A) 1
(B) 2
(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:
(A) Doppler’s Effect
(B) Beats
(C) Echo
(D) Acoustics
12. . The relationship between velocity V, frequency f, and wavelength λ of a wave is:
(A) f = V λ
(B) V = f λ
(C) λ = V f
(D) V = f/λ