Environmental Engineering in CE MCQs

Question 1

Pick out the wrong statement pertaining to 'green house' for the plants.

Accepted Answer

'Green house' is colder than the outside atmosphere

Answer

'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it

Answer

The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house

Answer

'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere. where CO2 acts like the glass of 'green house' thereby warming up the earth's surface

Question 2

Insufficient washing of sand grains in a rapid sand filter causes

Accepted Answer

Mud balls

Answer

Air binding

Answer

Shrinkage of filtering media

Answer

Expansion of filtering media

Question 3

Presence of high concentration of ozone and smog in atmospheric air causes the

Accepted Answer

Cracking of rubber products

Answer

Embrittlement & decrease of folding resistance of paper

Answer

Fading of dye on textiles

Answer

Damage of electrical insulator on high tension power line

Question 4

Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause

Accepted Answer

Explosion

Answer

Non biodegradable foam

Answer

Undesirable plant growth

Answer

Corrosion

Question 5

Turbidity of water is an indication of the presence of

Accepted Answer

Suspended inorganic matter

Answer

Dissolved solids

Answer

Floating solids

Answer

Dissolved gases

Question 6

Pick out the wrong statement.

Accepted Answer

The radio waves used in the long distance radio communication are reflected back to earth by stratosphere

Answer

The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone

Answer

Mesosphere is characterised by very low atmospheric pressure and low temperature

Answer

Troposhere is a dusty zone containing water vapor and clouds

Question 7

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

Accepted Answer

170

Answer

120

Answer

140

Answer

200

Question 8

Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.

Accepted Answer

90

Answer

20

Answer

60

Answer

120

Question 9

The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

Accepted Answer

90

Answer

60

Answer

105

Answer

120