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Chemical Engineering Mcqs 9594 MCQs [All-Courses]

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Chemical Engineering MCQs designed for job test and interview preparation, particularly for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover important topics such as the fundamentals of chemical engineering, chemical processes, chemical reactions, process control, and instrumentation, along with other key concepts in the field.

All Topics  9594

Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?
A Coal ash
B Potassium cyanide
C Ortho-xylene
D None of these
Correct Answer: Potassium cyanide
In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
A Hydrochloric acid
B Lime
C Copper sulphate
D Sodium sulphate
Correct Answer: Lime
What are the methods of treatment & disposal of radioactive wastes ?
A Evaporation & chemical precipitation
B Biological methods & adsorption in ion exchange materials
C Fixing into a solid mass with cement and sinking deep in the sea
D All A., B. & C.
Correct Answer: All A., B. & C.
Nitrogen oxides (NOx) is not produced in the ______________ industry?
A Nitric acid making
B Nitrogenous fertiliser
C Detergent
D Any of these
Correct Answer: Detergent
TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?
A 5
B 100
C 1000
D 2000
Correct Answer: 5
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream ?
A Sedimentation tank
B Circular clarifier
C Mechanical flocculation
D Chemical coagulation
Correct Answer: Chemical coagulation
The most commonly used chemical coagulant in water treatment is________________?
A Ferrous sulphate
B Alum
C Lime
D Hydrazine
Correct Answer: Alum
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?
A 100
B 1000
C 400
D 4000
Correct Answer: 100
Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
A Poor visibility due to sky darkening
B Irritation in eyes
C Respiratory trouble
D All A., B. and C.
Correct Answer: All A., B. and C.
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the_______________?
A Forestation
B Rain
C Green house effect
D Vegetation
Correct Answer: Green house effect
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