380+ Environmental Engineering Solved MCQs

Environmental engineering is a field of engineering that deals with the application of scientific and engineering principles for the protection of the environment and the health of the general public. Environmental engineers work to identify and assess the environmental impacts of human activities and design solutions to prevent or mitigate those impacts. They may work on a wide range of issues, such as air and water pollution, waste management, and sustainable development. Some common tasks of an environmental engineer include conducting environmental assessments, designing and implementing pollution control systems, and developing strategies for sustainable resource use.

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .

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201.	The maximum permissible turbidity for drinking water
A.	Zero
B.	1 - 4 ppm
C.	15 - 25 ppm
D.	3 - 50 ppm
E.	30 - 50 ppm
Answer» C. 15 - 25 ppm

202.	Per capita consumption of water is usually taken as
A.	50 - 100 litres
B.	150 - 300 litres
C.	400 - 500 litres
D.	500 - 750 litres
E.	750 - 1000 litres
Answer» B. 150 - 300 litres

203.	The incubation period of Typhoid bacillus causing typhoid fever is
A.	1 to 3 days
B.	3 to 5 days
C.	7 to 21 days
D.	20 to 30 days
E.	None of the above
Answer» C. 7 to 21 days

204.	Which of the following has least wave-length?
A.	Cosmic rays
B.	Ultraviolet rays
C.	X-rays
D.	Gamma rays
E.	None of the above
Answer» A. Cosmic rays

205.	The most injurious components of automobile exhaust for environment are
A.	Carbon monoxide and Carbon dioxide
B.	Carbon monoxide and lead
C.	Ethylene dichloride and ethylene dibromide
D.	Carbon dioxide and Sulphur dioxide
E.	Green
Answer» A. Carbon monoxide and Carbon dioxide

206.	The main disadvantage of hard water is
A.	Higher density
B.	More turbidity
C.	Foul smell
D.	Bad taste
E.	Increased soap consumption
Answer» E. Increased soap consumption

207.	Which of the following area of work needs highest level of illumination?
A.	Bakeries
B.	Book binding
C.	Confectionary factory
D.	Clothing factory
E.	None of the above
Answer» D. Clothing factory

208.	The speed of sound through water is nearly
A.	344 m/s
B.	750 m/s
C.	1500 m/s
D.	3000 m/s
E.	None of the above
Answer» C. 1500 m/s

209.	Protection from radiations is possible through
A.	shielding of source of radiation
B.	increased distance from the source of radiation
C.	limitation on time of exposure
D.	All of the above
E.	None of the above
Answer» D. All of the above

210.	Short circuit means
A.	Direct flow of current between two points of different potential
B.	Indirect flow of current between two points
C.	Direct flow of current between points of the same potential
D.	none of the above
E.	Green
Answer» A. Direct flow of current between two points of different potential

211.	Swimming pool water requires
A.	pre-chlorination
B.	super-chlorination
C.	dual-chlorination
D.	de-chlorination
E.	None of the above
Answer» D. de-chlorination

212.	Mycotoxins are poisonous chemicals produced by
A.	bacteria
B.	virus
C.	molds
D.	algae
E.	None of the above
Answer» C. molds

214.	The percentage of carbondioxide in atmospheric air is nearly
A.	3.2 percent
B.	0.32 percent
C.	0.032 percent
D.	0.0032 percent
E.	None of the above
Answer» C. 0.032 percent

215.	Turbidity in water is due to
A.	Algae
B.	Fungi
C.	Organic salts
D.	Finely divided particles of clay, silt and organic matter
E.	None of the above
Answer» D. Finely divided particles of clay, silt and organic matter

216.	The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is
A.	Idling
B.	Cruising at low speed
C.	Cruising at high speed
D.	Accelerating
E.	Decelerating
Answer» A. Idling

213.	The maximum permissible level or pesticides, in general, in drinking water is nearly
A.	1 to 50 ppm
B.	50 to 100 ppm
C.	100 to 250 ppm
D.	250 to 500 ppm
E.	500 to 1000 ppm
Answer» A. 1 to 50 ppm

217.	Mottling of teeth is associated with the presence of
A.	Chloride in water
B.	Calcium in water
C.	Sodium chloride in water
D.	Sulphur in water
E.	Fluorides in water
Answer» E. Fluorides in water

218.	The average percentage of carbon and hydrogen in petrol may be roughly given as
A.	50% C, 50% H2
B.	85% C, 15% H2
C.	15% C, 85% H2
D.	70% C, 30% H2
E.	None of the above
Answer» B. 85% C, 15% H2

219.	Sulphurdioxide can be measured by
A.	ultraviolet pulsed fluorescence
B.	flame photography
C.	permeation tube calibratio
D.	Any of the above
E.	None of the above
Answer» D. Any of the above

220.	Brackish taste of water is due to
A.	Chlorides of sodium
B.	Fluorides of sodium
C.	Turbidity
D.	Dead bacteria
E.	Any of the above
Answer» A. Chlorides of sodium

221.	Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
A.	Sulphur dioxide
B.	Sulphur trioxide
C.	Acid moist
D.	Hydrogen sulphide
E.	None of the above
Answer» D. Hydrogen sulphide

222.	Which of the following is the major source of flyash emission?
A.	Sintering plants
B.	Oil refineries
C.	Blast furnace
D.	Power plants
E.	Sulphuric acid plant
Answer» D. Power plants

223.	The process of killing the ineffective bacteria from the water and making it safe for use is known as
A.	Disinfection
B.	Sterilization
C.	Filtration
D.	Purification
E.	None of the above
Answer» A. Disinfection

224.	Theodolite is used by
A.	Surveyors
B.	Cartrographers
C.	Physicists
D.	Electronic Engineers
E.	None of these
Answer» A. Surveyors

225.	Which of the following space needs maximum number of air changes per hour?
A.	Assembly halls
B.	Restaurants
C.	Bed-rooms
D.	Class rooms
E.	None of the above
Answer» B. Restaurants

380+ Environmental Engineering Solved MCQs

The maximum permissible turbidity for drinking water

Per capita consumption of water is usually taken as

The incubation period of Typhoid bacillus causing typhoid fever is

Which of the following has least wave-length?

The most injurious components of automobile exhaust for environment are

The main disadvantage of hard water is

Which of the following area of work needs highest level of illumination?

The speed of sound through water is nearly

Protection from radiations is possible through

Short circuit means

Swimming pool water requires

Mycotoxins are poisonous chemicals produced by

The maximum permissible level or pesticides, in general, in drinking water is nearly

The percentage of carbondioxide in atmospheric air is nearly

Turbidity in water is due to

The emission of oxides of nitrogen in automobile exhaust will be least when the vehicle is

Mottling of teeth is associated with the presence of

The average percentage of carbon and hydrogen in petrol may be roughly given as

Sulphurdioxide can be measured by

Brackish taste of water is due to

Which of the following is unlikely to be the pollutant from a sulphuric acid plant?

Which of the following is the major source of flyash emission?

The process of killing the ineffective bacteria from the water and making it safe for use is known as

Theodolite is used by

Which of the following space needs maximum number of air changes per hour?

Water with least contamination can be be obtained from

Which of the following chemical is least poisonous?

Disinfection of drinking water means removal of

Scintillation counter can detect

Lead is a cumulative poison which ends up in

Which of the following area of work needs lowest noise level?

The hardness limit for portable water ranges between

The process used for the removal of dissolved carbondioxide from the water, is known as

Which of the following automobile will provide least pollution problems

Out of the following diesel engines, the minimum air consumption per BHP will be in

The bad smell due to decomposition of sewage, on account of the action of bacteria, is mainly due to the presence of

The permissible level of HCN in drinking water is

The chloride content in the water for public supplies should not exceed

Which of the following fuel has maximum resistance to detonation?

The most frequent method of bacterial reproduction is by

Normally the colour of exhaust from a diesel engine is

Geiger Muller counter can detect

Which of the following radio-nuclide has the shortest half life?

The becteria that can survive without oxygen is called

Bit is the unit of

The speed of sound will be maximum through

Dark, black smoke from diesel engines usually results when engine is

The noise level due to auto horn may be of the order of

Which one among the following terms best describes the method of converting a spherical surface into a plane surface?

Small concentrations of fluorides in water

226.	Water with least contamination can be be obtained from
A.	Rivers
B.	Lakes
C.	Wells
D.	Reservoirs
E.	Spring along the hill slope
Answer» E. Spring along the hill slope

227.	Which of the following chemical is least poisonous?
A.	Arsenic
B.	Lead
C.	Sodium
D.	Cyanide
E.	Mercury
Answer» C. Sodium

228.	Disinfection of drinking water means removal of
A.	Turbidity
B.	Colour
C.	Odour
D.	Oxygen
E.	Bacteria
Answer» E. Bacteria

229.	Scintillation counter can detect
A.	beta rays
B.	X-rays
C.	gamma rays
D.	All of the above
E.	None of the above
Answer» D. All of the above

230.	Lead is a cumulative poison which ends up in
A.	eyes
B.	eyes and ears
C.	bones and tissues
D.	legs and hands
E.	None of the above
Answer» C. bones and tissues

231.	Which of the following area of work needs lowest noise level?
A.	Gymnasiums
B.	Lecture halls
C.	Library
D.	Kitchens
E.	None of the above
Answer» C. Library

232.	The hardness limit for portable water ranges between
A.	10 - 50 ppm
B.	50 - 65 ppm
C.	75 - 117 ppm
D.	150 - 250 ppm
E.	300 - 700 ppm
Answer» C. 75 - 117 ppm

233.	The process used for the removal of dissolved carbondioxide from the water, is known as
A.	Coagulation
B.	Agitation
C.	Aeration
D.	Sedimentation
E.	Zeolitc
Answer» C. Aeration

234.	Which of the following automobile will provide least pollution problems
A.	Diesel engine powered
B.	Petrol engine powered
C.	Gas turbine powered
D.	Wankel engine powered
E.	Battery powered
Answer» E. Battery powered

235.	Out of the following diesel engines, the minimum air consumption per BHP will be in
A.	4 stroke mechanical injection
B.	4 stroke air injection
C.	2 stroke mechanical injection pump scavenging
D.	2 stroke air injection
E.	None of the above
Answer» A. 4 stroke mechanical injection