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. Hearing loss
- B. All A., B. & C.
- C. Nervousness & fatigue
- D. Rupture of ear drum
Explanation: Excessive workplace noise can cause temporary or permanent hearing loss, extreme exposure can rupture the eardrum, and prolonged exposure…
Correct answer: All A., B. & C.- A. 3
- B. 30
- C. 7
- D. 70
Explanation: Furnace noise rises when the fuel firing rate and combustion turbulence increase; a 50% increase is commonly taken as producing roughly a…
Correct answer: 3- A. 1
- B. 25
- C. 150
- D. 650
Explanation: The permissible lead concentration associated with public sewer or wastewater discharge is about 1 ppm.
Correct answer: 1- A. Foaming
- B. Undesirable plant growth
- C. Odour nuisances
- D. Turbidity
Explanation: Nitrogen and phosphorus act as nutrients and cause eutrophication, which stimulates excessive or undesirable aquatic plant and algal…
Correct answer: Undesirable plant growth- A. Nitrogen dioxide
- B. Sulphur dioxide
- C. Photochemical smog
- D. Dust particles
Explanation: Photochemical smog is formed in the atmosphere when nitrogen oxides and hydrocarbons react in sunlight, so it is a secondary pollutant.
Correct answer: Photochemical smog- A. 7 x 10^7
- B. 7 x 10^-7
- C. 107
- D. 10-7
Explanation: At 25°C, distilled water is neutral, so its hydrogen-ion concentration is 1.0 × 10^-7 mol/L.
Correct answer: 10-7- A. Blanketing effect of CO2 in the atmosphere
- B. Automobile exhaust
- C. De-forestation
- D. Thickening of ozone layer
Explanation: Carbon dioxide contributes to global warming by absorbing outgoing infrared radiation and producing a blanketing or greenhouse effect.
Correct answer: Blanketing effect of CO2 in the atmosphere- A. Ionosphere
- B. Troposphere
- C. Stratosphere
- D. None of these
Explanation: The troposphere is the lowest atmospheric layer and contains most of the atmosphere's mass because air density decreases rapidly with…
Correct answer: Troposphere- A. Skin disorder
- B. Cancer
- C. Bone disease
- D. Bronchitis
Explanation: Long-term exposure to nitrogen dioxide irritates and inflames the respiratory tract and can lead to bronchitis.
Correct answer: Bronchitis150. Which of the following processes is involved in the biochemical treatment of sewage effluents ?
- A. Oxidation
- B. Reduction
- C. Dehydration
- D. Fermentation
Explanation: In aerobic biological sewage treatment, microorganisms oxidise biodegradable organic matter, reducing its oxygen demand.
Correct answer: Oxidation- A. Urea
- B. Combustion
- C. Biomass burning
- D. Trees
Explanation: Combustion converts carbon in fuels into carbon dioxide and is the largest broad source among the listed choices.
Correct answer: Combustion- A. Electro-chemical cell
- B. Colorimeter
- C. Tintometer
- D. Turbidimeter
Explanation: A tintometer determines water colour by visually comparing the sample with standard coloured glass discs or solutions.
Correct answer: Tintometer- A. 10 to 20
- B. 4000 to 5000
- C. 1500 to 2500
- D. 100 to 200
Explanation: Slow sand filters operate at a very low filtration rate, commonly about 100 to 200 litres per square metre per hour.
Correct answer: 100 to 200- A. Cesspool
- B. Septic tank
- C. Skimming mill
- D. Lagoon
Explanation: A septic tank is an underground masonry or concrete chamber in which sewage undergoes anaerobic decomposition.
Correct answer: Septic tank- A. 60
- B. 90
- C. 105
- D. 120
Explanation: The commonly used occupational limit for continuous noise exposure over an eight-hour shift is about 90 dB.
Correct answer: 90- A. 0.001 to 0.01
- B. 5 to 10
- C. 2 to 3
- D. 0.2 to 0.3
Explanation: Treated drinking water is generally maintained with about 0.2 to 0.3 mg/L residual chlorine so that disinfection continues through the…
Correct answer: 0.2 to 0.3- A. Asphyxiation (suffocation)
- B. Shortness of breath
- C. Tuberculosis
- D. All A., B. and C.
Explanation: Inhaled silica dust causes silicosis, producing breathlessness and severely impaired respiration; it can also increase susceptibility to…
Correct answer: All A., B. and C.- A. 8 to 12
- B. 2 to 4
- C. 16 to 20
- D. 24 to 32
Explanation: Water is normally retained in a sedimentation tank for roughly 2 to 4 hours, allowing suspended particles to settle under gravity.
Correct answer: 2 to 4- A. Fats
- B. Carbohydrates
- C. Salts of metals
- D. Protein
Explanation: Salts of metals are inorganic pollutants because they do not consist primarily of carbon-based biological matter.
Correct answer: Salts of metals- A. Radioactive
- B. Water
- C. Noise
- D. Air
Explanation: The Ringelmann chart estimates the density or opacity of smoke from chimneys, so it is used to assess air pollution.
Correct answer: Air