MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 528 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Beyond what concentration of HS in air, acute danger to human life exists ? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 300 ppm |
| D. | 700 ppm |
| Answer» E. | |
| 2. |
TLV of NO & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO causes |
| A. | skin disorder |
| B. | bronchitis |
| C. | bone disease |
| D. | cancer |
| Answer» C. bone disease | |
| 3. |
Exposure to SO containing chimney gases results in the |
| A. | reduction in strength of leather & cloth. |
| B. | acceleration of corrosion rates of metals. |
| C. | increased drying & hardening time of paints. |
| D. | all (a), (b)and(c). |
| Answer» E. | |
| 4. |
Which of the following plants does not emit appreciable amount of SO in atmosphere ? |
| A. | Thermal power plant |
| B. | Petroleum refinery |
| C. | Nitric acid plant |
| D. | Sulphuric acid plant |
| Answer» D. Sulphuric acid plant | |
| 5. |
The maximum CO is emitted into the atmosphere by |
| A. | combustion |
| B. | urea |
| C. | biomass burning |
| D. | trees |
| Answer» B. urea | |
| 6. |
In water treatment, alum[Al(SO)] is used for the process of |
| A. | filtration |
| B. | coagulation |
| C. | sedimentation |
| D. | disinfection |
| Answer» C. sedimentation | |
| 7. |
Nitrogen oxides (NO) is not produced in the __________ industry. |
| A. | nitric acid making |
| B. | nitrogenous fertiliser |
| C. | detergent |
| D. | any of these |
| Answer» D. any of these | |
| 8. |
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters? |
| A. | I-131 |
| B. | Sr-90 |
| C. | Au-198 |
| D. | Ra-226 |
| Answer» E. | |
| 9. |
Acute danger to human life (i.e. death) exists, if the concentration of CO in atmospheric air exceeds __________ percent (by volume). |
| A. | 1 |
| B. | 3 |
| C. | 7 |
| D. | 20 |
| Answer» E. | |
| 10. |
Particles having diameter greater than 75 μm (micrometer = 10 mm) are called |
| A. | grit |
| B. | dust |
| C. | powder |
| D. | smoke |
| Answer» B. dust | |
| 11. |
Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m/hr. |
| A. | 0.1 to 1 |
| B. | 3 to 6 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» C. 10 to 15 | |
| 12. |
Water filtration rate in a slow sand filter ranges from __________ litres/m/hr. |
| A. | 10 to 20 |
| B. | 100 to 200 |
| C. | 1500 to 2500 |
| D. | 4000 to 5000 |
| Answer» C. 1500 to 2500 | |
| 13. |
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent. |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 14. |
__________ plant emits large amount of SO as an air pollutant. |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Chloralkali |
| D. | Iron & steel |
| Answer» C. Chloralkali | |
| 15. |
Which of the following is an adsorbant used for the removal of SO from gas/air ? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 16. |
Carbonaceous particles having size less than 1 μm are called |
| A. | grit |
| B. | aggregates |
| C. | aerosols |
| D. | smoke |
| Answer» E. | |
| 17. |
TLV of aldrin in public water supply system is about __________ μg/litre. |
| A. | 0.5 |
| B. | 17 |
| C. | 357 |
| D. | 1097 |
| Answer» C. 357 | |
| 18. |
When the concentration of SO in air is greater than __________ ppm, it gives a pungent smell. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 4 |
| Answer» E. | |
| 19. |
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m.(μg-microgram) |
| A. | 10 |
| B. | 90 |
| C. | 800 |
| D. | 750 |
| Answer» C. 800 | |
| 20. |
Direct reaction of unsaturated hydrocarbons with either NO or NO produces an eye irritating pollutant compound known as |
| A. | photochemical smog. |
| B. | peroxy acetyl nitrate (PAN) or methyl nitrile. |
| C. | benzopyrene. |
| D. | poly acrylonitrile |
| Answer» C. benzopyrene. | |
| 21. |
Which of the following is a green house gas other than CO ? |
| A. | Methane |
| B. | Nitrous oxide |
| C. | Chlorofluro carbons (CFC) |
| D. | All (a), (b) and (c) |
| Answer» E. | |
| 22. |
In troposphere (the weather domain), the temperature '' at height '' above the spa level in metres is given by (where, temperature at sea level is 15°C and is in °C.) |
| A. | = 15 - 0.0065 |
| B. | = 15 + 0.0065 |
| C. | = 0.0035 |
| D. | -15 |
| E. | = 15 - 0.0035 |
| Answer» B. = 15 + 0.0065 | |
| 23. |
Death may occur, when SO concentration in atmospheric air exceeds __________ ppm. |
| A. | 20 |
| B. | 100 |
| C. | 400 |
| D. | 200 |
| Answer» D. 200 | |
| 24. |
Higher concentration of CO in atmosphere |
| A. | allows visible solar radiation (ultraviolet) of short wave-length to pass through. |
| B. | reflects and absorbs the longer wavelength (infra-red) radiations. |
| C. | prevents solar heat being radiated out completely, resulting in 'heat trap' i.e., global warming. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 25. |
TLV of ozone (O) and phosgene (COCl) in air is __________ ppm. |
| A. | 0.1 |
| B. | 25 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 25 | |
| 26. |
HS present in gaseous stream can be removed by adsorption on |
| A. | silica gel |
| B. | active carbon |
| C. | bog iron |
| D. | limestone powder |
| Answer» D. limestone powder | |
| 27. |
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO in air is __________ ppm. |
| A. | 5 |
| B. | 500 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 500 | |
| 28. |
Maximum allowable concentration of CO in air for safe working is __________ ppm (parts per million). |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 29. |
Which of the following is represented b the green curve in the above figure? |
| A. | deoxygenation curve |
| B. | reoxygenation curve |
| C. | oxygen sag curve |
| D. | equilibrium concentration of oxygen |
| Answer» C. oxygen sag curve | |
| 30. |
In which type of settling, settling of particles takes place by the contact of impurities with each other present inwastewater? |
| A. | flocculent settling |
| B. | hindered settling |
| C. | compression settling |
| D. | discrete settling |
| Answer» D. discrete settling | |
| 31. |
is the velocity at which the solid matter in sewage remained in suspended form. |
| A. | settling velocity |
| B. | self cleansing velocity |
| C. | mean velocity |
| D. | non scouring velocity |
| Answer» C. mean velocity | |
| 32. |
Which of the following device is used for the removal of oil and grease? |
| A. | skimming tank |
| B. | grit chambers |
| C. | tube settlers |
| D. | flocculator |
| Answer» B. grit chambers | |
| 33. |
Screens are inclined to the direction offlow to |
| A. | increase the flowvelocity |
| B. | increase theopening area |
| C. | decrease theflow velocity |
| D. | increase the headloss |
| Answer» D. increase the headloss | |
| 34. |
The wet weather flow is also known by |
| A. | minimum sewageflow |
| B. | maximum sewageflow |
| C. | storm waterflow |
| D. | average rate offlow |
| Answer» D. average rate offlow | |
| 35. |
How many types of aerators are commonly used in the treatment ofwastewater? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 36. |
How is mixing done in SBR? |
| A. | manual |
| B. | mechanical |
| C. | air stripping |
| D. | agitation by air |
| Answer» C. air stripping | |
| 37. |
The design velocity of flow of adetritus tank is |
| A. | 1m/sec |
| B. | 1.2m/sec |
| C. | 0.9m/sec |
| D. | 0.5m/sec |
| Answer» D. 0.5m/sec | |
| 38. |
Which system of collection of sewageis a dry system? |
| A. | conservancysystem |
| B. | biologicaldigestion |
| C. | incernation |
| D. | water carriagesystem |
| Answer» B. biologicaldigestion | |
| 39. |
What is yellow curve represents in the following figure? |
| A. | deoxygenation curve |
| B. | reoxygenation curve |
| C. | oxygen sag curve |
| D. | equilibrium concentration of oxygen |
| Answer» B. reoxygenation curve | |
| 40. |
In which type of settling, sedimentation of discrete particlestakes place? |
| A. | zone settling |
| B. | compression settling |
| C. | hindered settling |
| D. | discrete settling |
| Answer» E. | |
| 41. |
Which of the following process is not adopted in oxidation ditches? |
| A. | adsorption |
| B. | desorption |
| C. | oxidation |
| D. | decomposition |
| Answer» C. oxidation | |
| 42. |
Which reactors are characterized by non- continuous reactions? |
| A. | plug flow reactor |
| B. | continuous reactor |
| C. | batch reactor |
| D. | fluidized bed reactor |
| Answer» D. fluidized bed reactor | |
| 43. |
What is the minimum depth of water to be kept in the oxidation pond? |
| A. | 0.3m |
| B. | 0.5m |
| C. | 1 m |
| D. | 1.5m |
| Answer» D. 1.5m | |
| 44. |
The average time required by water to pass through the settling tank is called |
| A. | detention time |
| B. | flow through period |
| C. | time of flow |
| D. | mean time |
| Answer» C. time of flow | |
| 45. |
is the flow through sewers available during non-rainfall period. |
| A. | gradually varied flow |
| B. | rapidly varied flow |
| C. | dry weather flow |
| D. | storm water flow |
| Answer» D. storm water flow | |
| 46. |
The maximum size of filter media of apercolating filter is |
| A. | 10mm |
| B. | 25mm |
| C. | 60mm |
| D. | 75mm |
| Answer» E. | |
| 47. |
is the ratio of volume of recirculated sewage to the raw sewage. |
| A. | recirculation factor |
| B. | recirculation ratio |
| C. | food to mass ratio |
| D. | bod |
| Answer» C. food to mass ratio | |
| 48. |
The recirculation ratio for the low ratetrickling filter is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| Answer» E. | |
| 49. |
is the additional flowoccurring during rainy season. |
| A. | gradually variedflow |
| B. | rapidly variedflow |
| C. | dry weatherflow |
| D. | storm waterflow |
| Answer» E. | |
| 50. |
The size of filter media in a high ratetrickling filter is |
| A. | 10-20mm |
| B. | 34-68mm |
| C. | 25-60mm |
| D. | 20-50mm |
| Answer» D. 20-50mm | |