41. Insufficient washing of sand grains in a rapid sand filter causes
Air binding
Shrinkage of filtering media
Mud balls
Expansion of filtering media
✅ The correct answer is option C.
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.
42. Hazardous/polluting chemical industries should have an ‘exclusion zone’ with a green belt and general public access prohibited around it, covering a radius of ____ metres.
100
1000
400
4000
✅ The correct answer is option B.
43. Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.
0.1 to 1
3 to 6
10 to 15
15 to 20
✅ The correct answer is option B.
44. The biological decomposition of organic substances in wastes controlled conditions is called
Incineration
Biological oxidation
Composting
None of these
✅ The correct answer is option C.
45. Exposure to SO₂ containing chimney gases results in the
Reduction in strength of leather & cloth
Acceleration of corrosion rates of metals
Increased drying & hardening time of paints
All of the above
✅ The correct answer is option D.
46. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
120
140
170
200
✅ The correct answer is option C.
47. Smoke is produced due to
Insufficient supply of combustion air and insufficient time for combustion
Poor quality of fuel and improper mixing of fuel & combustion air
Poor design & overloading of furnace
All of the above
✅ The correct answer is option D.
48. TLV of NO₂ & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO₂ causes
Skin disorder
Bronchitis
Bone disease
Cancer
✅ The correct answer is option B.
49. Which is the most widely used coagulant for the treatment of turbid water?
Alum (aluminium sulphate)
Lime
Ferric chloride
Sodium aluminate
✅ The correct answer is option A.
50. Radioactive solid nuclear wastes are disposed off by
High temperature incineration
Pathological incineration
Pyrolysis
Underground burial in concrete containers
✅ The correct answer is option D.