Sound which has jarring effect on ears is……..
a) Noise
b) Music’s
c) Pleasant sound
d) Soul music
A safe level of noise depends on……………...
a) Level of noise and exposure to noise
b) Pitch
c) Frequency
The sounds which are pleasant to our ears is…
a) Noise
b) Musical sound
c) Frequency
d) Amplitude
Even speaking loudly also contributes to…..… pollution.
a) Air
b) Water
c) Noise
d) Soil
Sound becomes hazardous noise pollution at decibels……………
a) Above 80
b) Above 20
c) Above 50
d) Above 120
Greenhouse effect is responsible for:
NTS PST–P-2----2015
a) melting of glaciers
b) rising sea level
c) dramatic climate change
d) all of these
