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.

1. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.

Low amount of excess combustion air

Large quantity of excess combustion air

Hydrocarbon fuel

Pulverised coal as fuel

✅ The correct answer is option A.

2. A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth’s atmosphere, which absorbs it.

Hydrogen

Carbon dioxide

Ozone

None of these

✅ The correct answer is option C.

3. Most of the atmospheric air pollutants are present in large quantity in

Stratosphere

Thermosphere

Trophosphere

Mesosphere

✅ The correct answer is option C.

4. Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

Gravity settling chamber

Cyclone separator

Electrostatic precipitator

Bag filter

✅ The correct answer is option C.

5. Maximum permissible turbidity in potable water is __________ ppm.

1

10

250

1000

✅ The correct answer is option B.

6. Which of the following is a secondary air pollutant?

Photochemical smog

Sulphur dioxide

Nitrogen dioxide

Dust particles

✅ The correct answer is option A.

7. The pH value of oxidised sewage is about

1.8

6.2

7.3

13.4

✅ The correct answer is option C.

8. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

Chemical coagulation

Floatation & skimming

Centrifugation

Ultrafiltration

✅ The correct answer is option A.

9. Reingleman chart is used for the evaluation of __________ pollution.

Air

Water

Noise

Radioactive

✅ The correct answer is option A.

10. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?

NOx

Hg

SO₂

F

✅ The correct answer is option C.