5851. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
Pipe vibrations
Cavitation
Boundary layer separation
Fluctuation in liquid flow
✅ The correct answer is option B.
Chemical Engineering
Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.
5852. Presence of iron and manganese in water causes
Reduction in its dissolved oxygen content
Discoloration of bathroom fixtures
Temporary hardness
None of these
✅ The correct answer is option B.
5853. A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
Cesspool
Lagoon
Skimming mill
Septic tank
✅ The correct answer is option D.
5854. Pollution by particulate matter emission in the atmosphere does not take place during metal
Grinding
Machining
Cutting
Polishing
✅ The correct answer is option D.
5855. Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.
2
42
332
1050
✅ The correct answer is option B.
5856. In a sedimentation tank, the detention period for water ranges from __________ hours.
2 to 4
8 to 12
16 to 20
24 to 32
✅ The correct answer is option A.
5857. Lagooning process is mainly a means of the
Sludge disposal
Reduction of excessive flow in sewers
Biological treatment of wastes
None of these
✅ The correct answer is option A.
5858. Which of the following industries discharge mercury as a pollutant?
Chloro-alkali industry
Tanneries
Beverage plant
Phosphoric acid plant
✅ The correct answer is option A.
5859. Tolerable limit of nitrogen oxides in air is __________ ppm.
0.1
1
5
25
✅ The correct answer is option C.
5860. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
1
5
50
500
✅ The correct answer is option B.