Environmental Engineering MCQs

Enhance your preparation with our Environmental Engineering MCQs with answers and explanations. Our collection covers key topics such as water and wastewater treatment, air pollution control, solid waste management, environmental impact assessment, sustainability, and environmental regulations. These multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and environmental engineering job assessments. Practice online to strengthen your concepts, improve problem-solving skills, and excel in exams with our updated Environmental Engineering MCQs.

61. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

Ozone and iodine

Chlorine or its compounds

Ultraviolet light for irradiation of water

All of the above

✅ The correct answer is option D.

62. Inhalation of silica dust causes a disease called

Bronchitis

Silicosis

Pneumoconiosis

None of these

✅ The correct answer is option B.

63. Removal of __________ is accomplished by aeration of water.

Dissolved gases

Suspended solids

Dissolved solids

None of these

✅ The correct answer is option A.

64. The lowest layer of atmosphere is known as the

Stratosphere

Troposphere

Ionosphere

None of these

✅ The correct answer is option B.

65. Carbon monoxide is a pollutant, which causes

Respiratory disease (e.g. asthma)

Asphyxiation (suffocation) leading to death

Retardation in crop growth

Damage to building materials like marble

✅ The correct answer is option B.

66. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of

CO₂

SO₂

Hydrocarbons

CFC (chloro fluoro carbon)

✅ The correct answer is option D.

67. Ozone is

A primary pollutant

A secondary pollutant

Impervious to ultra-violet rays

Both B & C

✅ The correct answer is option D.

68. Corrosion in boilers can be prevented by

Deaeration of feed water

Enhancing pH of feed water by adding alkali

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

All of the above

✅ The correct answer is option D.

69. A ‘body’ which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Global warming

Green house

Atmospheric effect

Ionosphere

✅ The correct answer is option B.

70. The principal gas evolved from sludge digestion tank is

CO

CO₂

CH₄

N₂

✅ The correct answer is option C.