Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?

Related Mcqs:

Fresh sewage is ______________ in nature?

A. Acidic B. Neutral C. Alkaline D. Highly acidic...

Pick out the correct statement?

A. Noise from ball mills can be dealt with by fibre glass lined enclosures B. Noise from vibrating chutes can be reduced by lining the metallic chute with rubber C. Noise of conveyor belt system is reduced by using urethane coated cloth conveyor belts and rubber/plastic covered metallic rollers D. All A., B. & C....

Which of the following is an adsorbent used for the removal of SO2 from gas/air ?

A. Bog iron B. Limestone powder or alkalised alumina C. Silica gel D. Active carbon...

Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?

A. Poor visibility due to sky darkening B. Irritation in eyes C. Respiratory trouble D. All A., B. and C....

Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly _____________ substances?

A. Radioactive B. Organic C. Inorganic D. None of these...