MCQOPTIONS
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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.
| 501. |
Infective bacteria in water is killed by the __________ process. |
| A. | sterilisation |
| B. | aeration |
| C. | disinfection |
| D. | none of these |
| Answer» B. aeration | |
| 502. |
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)? |
| A. | Lagooning |
| B. | Activated carbon adsorption |
| C. | Biological oxidation pond |
| D. | Chemical coagulation |
| Answer» C. Biological oxidation pond | |
| 503. |
Which of the following pollutants is absent in the emissions from a fertiliser plant ? |
| A. | SO2 & SO3 |
| B. | NO2 |
| C. | NH3 |
| D. | CO |
| Answer» E. | |
| 504. |
The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria. |
| A. | anaerobic |
| B. | saphrophytic |
| C. | aerobic |
| D. | parasitic |
| Answer» D. parasitic | |
| 505. |
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent. |
| A. | 1 |
| B. | 4 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 506. |
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. |
| A. | 90 |
| B. | 120 |
| C. | 150 |
| D. | 180 |
| Answer» C. 150 | |
| 507. |
Exposure to chemicals having carcinogenic properties cause |
| A. | dermatitis (skin disorder) |
| B. | cancer |
| C. | asphyxiation (suffocation) |
| D. | asthma |
| Answer» C. asphyxiation (suffocation) | |
| 508. |
H2S 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 | |
| 509. |
Smog is |
| A. | nothing but black smoke. |
| B. | a combination of smoke and fog. |
| C. | a liquid particle resulting from vapor condensation. |
| D. | a solid particle e.g. flyash. |
| Answer» C. a liquid particle resulting from vapor condensation. | |
| 510. |
Most of the atmospheric air pollutants are present in large quantity in |
| A. | stratosphere |
| B. | thermosphere |
| C. | trophosphere |
| D. | mesosphere |
| Answer» D. mesosphere | |
| 511. |
Persons working in cement plants and limestone quarries are more prone to disease like |
| A. | cancer |
| B. | asthma |
| C. | silicosis |
| D. | flourosis (bone disease) |
| Answer» D. flourosis (bone disease) | |
| 512. |
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ? |
| A. | Idle running |
| B. | Acceleration |
| C. | Cruising |
| D. | Deaccelaration |
| Answer» B. Acceleration | |
| 513. |
Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the |
| A. | gravity settling chamber |
| B. | cyclone separator |
| C. | electrostatic precipitator |
| D. | bag filter |
| Answer» D. bag filter | |
| 514. |
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by |
| A. | biological oxygen pond. |
| B. | aerated lagoons. |
| C. | trickling filters. |
| D. | gravity separator having oil skimming devices. |
| Answer» E. | |
| 515. |
In water treatment plant, zeolite process is used to remove the __________ of water. |
| A. | acidity |
| B. | alkalinity |
| C. | hardness |
| D. | iron & zinc |
| Answer» D. iron & zinc | |
| 516. |
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called |
| A. | fumes |
| B. | mists |
| C. | smoke |
| D. | aerosols |
| Answer» E. | |
| 517. |
Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million). |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 518. |
The term Biological Oxygen Demand (BOD) is used in relation to |
| A. | potable water |
| B. | cooling water |
| C. | distilled water |
| D. | industrial effluents |
| Answer» E. | |
| 519. |
Which of the following is the most detrimental for water used in high pressure boiler ? |
| A. | Silica |
| B. | Turbidity |
| C. | Phenol |
| D. | Dissolved oxygen |
| Answer» B. Turbidity | |
| 520. |
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings. |
| A. | hydrogen sulphide |
| B. | mercury |
| C. | cadmium |
| D. | asbestos |
| Answer» D. asbestos | |
| 521. |
Operating principle of cyclone separator is based on the action of __________ dust particles. |
| A. | diffusion of |
| B. | centrifugal force on |
| C. | gravitational force on |
| D. | electrostatic force on |
| Answer» C. gravitational force on | |
| 522. |
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes |
| A. | fire hazards. |
| B. | explosion hazards. |
| C. | persistent foam. |
| D. | depletion of dissolved oxygen. |
| Answer» D. depletion of dissolved oxygen. | |
| 523. |
Scale formation in boiler is controlled by |
| A. | preheating of feed water. |
| B. | reduction in hardness, silica & alumina in feed water. |
| C. | keeping the pH value of feed water just below 7. |
| D. | eliminating H2S in feed water. |
| Answer» C. keeping the pH value of feed water just below 7. | |
| 524. |
The commonest form of iron & manganese found in ground water as pollutant is in the form of their |
| A. | carbonates |
| B. | bi-carbonates |
| C. | chlorides |
| D. | sulphides |
| Answer» C. chlorides | |
| 525. |
Pick out the wrong statement pertaining to 'green house' for the plants. |
| A. | 'Green house' (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it. |
| B. | The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house. |
| C. | 'Green house effect' in earth's atmosphere is due to increasing CO2 level in atmosphere. where CO2 acts like the glass of 'green house' thereby warming up the earth's surface. |
| D. | 'Green house' is colder than the outside atmosphere. |
| Answer» E. | |
| 526. |
Smoke is produced due to |
| A. | insufficient supply of combustion air and insufficient time for combustion. |
| B. | poor quality of fuel and improper mixing of fuel & combustion air. |
| C. | poor design & overloading of furnace. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 527. |
Ionisation potential employed in the industrial electrostatic precipitator is of the order of |
| A. | 30 to 70 kV DC |
| B. | 30 to 70 kV AC |
| C. | 230 V AC |
| D. | 230 V DC |
| Answer» B. 30 to 70 kV AC | |
| 528. |
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by |
| A. | biological oxygen pond. |
| B. | radial settling tank (thickener) using coagulant (lime & ferrous sulphate). |
| C. | lagoons. |
| D. | filtration. |
| Answer» C. lagoons. | |