ENVIRONMENTAL ENGINEERING IN CE QUIZ

Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43961

15-20

43832

25-30

TRUE ANSWER : ?
YOUR ANSWER : ?

Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Powder

Dust

Smoke

Grit

TRUE ANSWER : ?
YOUR ANSWER : ?

Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

In vacuum filter

In clarifiers

By chemical coagulation

In sedimentation tanks equipped with mechanical scrapper

TRUE ANSWER : ?
YOUR ANSWER : ?

Corrosion in boilers can be prevented by

All of these

Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion

Enhancing pH of feed water by adding alkali

Deaeration of feed water

TRUE ANSWER : ?
YOUR ANSWER : ?

Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called

Stratosphere

Thermosphere

Troposphere

Mesosphere

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum permissible residual chlorine in treated water should be __________ mg/litre.

02 to 0.3

5 to 10

2 to 3

0.001 to 0.01

TRUE ANSWER : ?
YOUR ANSWER : ?

From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.

5

500

50

1

TRUE ANSWER : ?
YOUR ANSWER : ?

Higher concentration of CO₂ in atmosphere

Prevents solar heat being radiated out completely, resulting in

Allows visible solar radiation (ultraviolet) of short wave-length to pass through

All of these

Reflects and absorbs the longer wavelength (infra-red) radiations

TRUE ANSWER : ?
YOUR ANSWER : ?

Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

Quenching of hot coke

Filtration and recycling for cooling coke oven gas

None of these

Discharging in the river stream

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following pollutants, if present in atmosphere is detectable by its odour?

SO₂

CO₂

NO₂

CO

TRUE ANSWER : ?
YOUR ANSWER : ?