Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Refrigerators
- B. Xerox machines
- C. Dermatological photo-therapy equipments
- D. High voltage electrical equipments
Explanation: Xerographic machines, some ultraviolet phototherapy equipment, and high-voltage electrical devices can generate ozone.
Correct answer: Refrigerators- A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
- B. All A., B. & C.
- C. Is harmful for crops and trees also besides causing eye irritation & asthma
- D. Appears only on sunny days
Explanation: Photochemical smog develops when hydrocarbons and nitrogen oxides from vehicle exhaust react in sunlight, producing oxidants such as…
Correct answer: All A., B. & C.- A. Asphyxiation
- B. Shortness of breath
- C. Both B. & C.
- D. Tuberculosis
Explanation: Silica dust causes silicosis, whose important symptom is breathlessness, and silicosis also greatly increases susceptibility to pulmonary…
Correct answer: Both B. & C.- A. Troposphere
- B. Stratosphere
- C. Ionosphere
- D. None of these
Explanation: The troposphere is the atmosphere’s lowest layer and contains most atmospheric mass and water vapour, so nearly all weather occurs in it.
Correct answer: Troposphere- A. Alkalis
- B. Chlorine
- C. Benzene hexachloride
- D. Alkyl benzene sulphonate (ABS)
Explanation: Chlorine is widely used to disinfect water because it forms hypochlorous acid, a strong antimicrobial agent that destroys many water-borne…
Correct answer: Chlorine- A. Bone decay
- B. Asphyxiation (suffocation)
- C. Cancer
- D. Anemia
Explanation: A carcinogen is an agent capable of initiating or promoting cancer, so carcinogenic air pollutants are linked directly with cancer.
Correct answer: Cancer167. The resistance of water to the passage of light through it is a measure of the___________________?
- A. Dissolved gases
- B. Color
- C. Hardness
- D. Turbidity
Explanation: Turbidity is the cloudiness of water caused by suspended particles that scatter or block light, so it measures resistance to light…
Correct answer: Turbidity- A. Grey
- B. Dark brown
- C. Red
- D. Black
Explanation: Fresh domestic sewage is usually grey or light grey because it has not yet undergone significant anaerobic decomposition.
Correct answer: Grey- A. Positively charged
- B. Negatively charged
- C. Combination of all A., B. & C.
- D. Neutral
Explanation: Atmospheric aerosols may acquire positive or negative charge, while many particles remain electrically neutral.
Correct answer: Combination of all A., B. & C.- A. 80
- B. 100
- C. 125
- D. 150
Explanation: Noise inside a jet airliner during normal flight is commonly around 100 dB, although the exact level varies with aircraft type and seating…
Correct answer: 100- A. Ozone
- B. Carbon dioxide
- C. Hydrogen
- D. None of these
Explanation: The ozone layer absorbs much of the Sun’s harmful ultraviolet radiation before it reaches Earth’s surface.
Correct answer: Ozone172. Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
- A. Mercury
- B. Fluoride
- C. Lead
- D. Arsenic
Explanation: Fluorosis results from long-term intake of excessive fluoride, producing mottling of teeth and, at higher exposure, skeletal damage.
Correct answer: Fluoride- A. Acts as a green house gas thereby raising earth's temperature
- B. Causes asphyxia
- C. Causes increase in sea level
- D. Enhances the green house effect
Explanation: Carbon monoxide binds strongly with haemoglobin, forming carboxyhaemoglobin and preventing blood from carrying oxygen, so concentrations…
Correct answer: Causes asphyxia- A. Coagulation
- B. Filtration
- C. Preheating it
- D. Anion exchanger
Explanation: Soluble silica is present as ionic or weakly ionised species and is removed effectively by a strong-base anion exchanger during…
Correct answer: Anion exchanger- A. 1
- B. 7
- C. 19
- D. 82
Explanation: The stated permissible mercury concentration in blood is about 7 micrograms per 100 cc.
Correct answer: 7- A. Hydrogen
- B. Acetylene
- C. Carbon monoxide
- D. Ammonia
Explanation: Acetylene has an exceptionally wide flammability range in air, approximately 2 to 81% by volume, so it can form explosive mixtures over a…
Correct answer: Acetylene- A. Iodine
- B. Zinc
- C. Iron
- D. Bromine
Explanation: Iron salts oxidise to hydrated ferric compounds that deposit as reddish-brown stains on fabrics.
Correct answer: Iron178. The main type of sludge gas evolved during sewage treatment in Imhoff tank is___________________?
- A. CO2
- B. H2
- C. CO
- D. CH4
Explanation: Anaerobic digestion of sewage sludge in an Imhoff tank produces biogas, whose principal combustible component is methane.
Correct answer: CH4- A. Nitric acid
- B. Sulphuric acid
- C. Chlor alkali
- D. Iron & steel
Explanation: Sulphuric acid manufacture can release sulphur dioxide, particularly from sulphur burning or sulphide-ore roasting, if gas conversion and…
Correct answer: Sulphuric acid- A. Industrial chimney exhaust
- B. Photochemical reaction in polluted atmosphere
- C. Automobiles exhaust
- D. Burning of domestic fuel
Explanation: Automobile engines produce carbon monoxide when fuel burns incompletely, especially under fuel-rich conditions.
Correct answer: Automobiles exhaust