80% less than 200 mesh size particles are called____________________?

A. Smoke
B. Powder
C. Grit
D. Aggregates

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

A. NOx
B. Hg
C. SO2
D. F

Higher concentration of CO2 in atmosphere_____________________?

A. Allows visible solar radiation (ultraviolet) of short wave-length to pass through
B. Reflects and absorbs the longer wavelength (infra-red) radiations
C. Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming
D. All A., B. and C.

Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?

A. Blood poisoning
B. Anaemia
C. Nervous system disorder
D. All A., B. & C.

Maximum permissible turbidity in potable water is _____________ ppm?

A. 1
B. 10
C. 250
D. 1000

H2S present in gaseous stream can be removed by adsorption on _____________________?

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

Radioactive substances present in the polluted water stream can be removed by_________________?

A. Biological oxygen treatment
B. Coagulation and filtration
C. Adsorption in ion exchange materials
D. None of these

TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?

A. 0.1
B. 25
C. 100
D. 1000

Presence of bacteria in potable (drinking) water causes_________________?

A. Turbidity
B. Disease
C. Bad odour
D. Bad taste & colour

Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?

A. 120
B. 140
C. 170
D. 200