List of top Air and Noise Pollution Questions on Pollution asked in GATE ES

The equipment that can be used to control particulate air pollution in an industrial unit is/are

Which is/are the secondary air pollutant(s)?

A gravity settling chamber of height ‘H' and length ‘L' is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is $'V_h'$ and terminal settling velocity of the target particle is $'V_ť$. Which one of the following expressions is the correct concept used to calculate the minimum size of the target particle that will be removed with 100% efficiency?

Match the following: Plastic Types and Applications

Code	Plastic Type	Common Applications
P	High-density polyethylene (HDPE)	(iv) Geomembrane for landfill liner
Q	Low-density polyethylene (LDPE)	(i) Garbage bags, bubble packaging
R	Polyethylene terephthalate (PET)	(iii) Water bottles
S	Polystyrene (PS)	(ii) Pharmaceutical bottles, Styrofoam cups

Which of the following is true according to the Central Pollution Control Board (CPCB), Government of India’s notification issued in the year 2009?

A ground level source emits 1000 g/day of SO$_2$. Wind speed = 2 m/s. Dispersion coefficients at 1000 m downwind are given. Estimate the ground-level SO$_2$ concentration (in $\mu$g/m$^3$, rounded off to two decimals) at 1000 m at the plume centerline.

According to the National Ambient Air Quality Standards (CPCB, Govt. of India, 2009), which of the following statement(s) is/are correct?

A relatively calm room has background sound power level (SPL) of 30 decibels (dB). A television and a radio with SPL of 80 dB and 70 dB, respectively, started operating simultaneously in this room. Given the reference sound power is $10^{-12}$ Watts, what will be the resulting SPL in the room, assuming all the sources operate independently?

PM$_{2.5}$ concentrations in ambient air can be measured using