Vibration produces…… NTS PST 24/11/2019 (11:30)
a) light
b) sound
c) heat
d) speed
The pleasant effect of sound is…………..
a) Music
b) Loud sound
c) Low sound
d) Noise
Noisy environment is due to …………….
a) Unpleasant sound
b) Slow wind
c) Music
d) Pleasant sound
Sound cannot travel through … PST ---P-1----18L
a) Liquids
b) Vacuum
c) Sounds
d) gases
Sound waves produced by……………..
a) Linear motion
b) Circular motion
c) Vibrating motion
d) Transitional motion
To hear a clear echo, the reflecting surface should be at least ……..away from the source of sound.
a) 13 m
b) 17 m
c) 21 m
d) 27 m
