The sounds which are pleasant to our ears is…
a) Musical sound
b) Noise
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
Which of the following pollution is caused due to presence of unwanted or excessive artificial lightening?
a) noise pollution
b) water pollution
c) light pollution
d) air pollution
Which of the following are the main effects of light pollution?
a) change visibility of natural features
b) increasing amount of carbon dioxide
c) both a & b
d) none of these
By reducing air pollution, we can also protect the…………
a) weather
b) climate
c) both a & b
d) cloning
