MCQOPTIONS
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MCQOPTIONS
This section includes 444 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
In sewage treatment, its sedimentation is speeded up by commonly adding |
| A. | Hydrochloric acid |
| B. | Lime |
| C. | Copper sulphate |
| D. | Sodium sulphate |
| Answer» C. Copper sulphate | |
| 202. |
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm. |
| A. | 5 |
| B. | 500 |
| C. | 1000 |
| D. | 2000 |
| Answer» B. 500 | |
| 203. |
Which of the following is an adsorbant used for the removal of SO₂ from gas/air? |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 204. |
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks. |
| A. | 1 to 2 |
| B. | 4 to 5 |
| C. | 9 to 10 |
| D. | 15 to 20 |
| Answer» C. 9 to 10 | |
| 205. |
In a sedimentation tank, the detention period for water ranges from __________ hours. |
| A. | 2 to 4 |
| B. | 8 to 12 |
| C. | 16 to 20 |
| D. | 24 to 32 |
| Answer» B. 8 to 12 | |
| 206. |
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere? |
| A. | Thermal power plant |
| B. | Petroleum refinery |
| C. | Nitric acid plant |
| D. | Sulphuric acid plant |
| Answer» D. Sulphuric acid plant | |
| 207. |
Dose of chlorine for disinfection of water is about __________ mg/litre of water. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 0.3 |
| D. | 1 |
| Answer» E. | |
| 208. |
Smog is not formed due to the presence of __________ in the atmosphere. |
| A. | SO₂ |
| B. | NOx |
| C. | CO₂ |
| D. | Any of these |
| Answer» D. Any of these | |
| 209. |
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water. |
| A. | Mercury |
| B. | Lead |
| C. | Fluoride |
| D. | Arsenic |
| Answer» D. Arsenic | |
| 210. |
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‚ÇÇ in contaminated air at which it acts as a natural asphyxant is ‚â• __________ percent.~! |
| A. | 84 |
| B. | 88 |
| C. | 80 |
| D. | 92 |
| Answer» B. 88 | |
| 211. |
Higher concentration of nitrogen dioxide in atmospheric air causes~! |
| A. | Cancer |
| B. | Bronchitis |
| C. | Asphyxiation |
| D. | Corrosion |
| Answer» C. Asphyxiation | |
| 212. |
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 |
| Answer» E. | |
| 213. |
Dust collection efficiency of a cyclone separator depends upon its%! |
| A. | Diameter |
| B. | Inlet gas velocity |
| C. | Overall height |
| D. | All of the above |
| Answer» E. | |
| 214. |
The pH value of potable water should be between%! |
| A. | 1 to 1.5 |
| B. | 6.5 to 8 |
| C. | 13 to 14 |
| D. | 4 to 5 |
| Answer» C. 13 to 14 | |
| 215. |
Ozone is%! |
| A. | A primary pollutant |
| B. | A secondary pollutant |
| C. | Impervious to ultra-violet rays |
| D. | Both B & C |
| Answer» E. | |
| 216. |
Aerobic biological oxidation ponds used for the purification of polluted water%! |
| A. | Destroys/removes pathogen from the sewage |
| B. | Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents |
| C. | Destroys/removes pathogen much more effectively if the sewage is chlorinated |
| D. | All of the above |
| Answer» E. | |
| 217. |
Soluble silica present in boiler feed water can be removed by%! |
| A. | Coagulation |
| B. | Filtration |
| C. | Anion exchanger |
| D. | Preheating it |
| Answer» D. Preheating it | |
| 218. |
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 | |
| 219. |
Removal of __________ results from the disinfection of water.%! |
| A. | Turbidity |
| B. | Odour |
| C. | Hardness |
| D. | Bacteria |
| Answer» E. | |
| 220. |
Which of the following is an adsorbant used for the removal of SO‚ÇÇ from gas/air?%! |
| A. | Bog iron |
| B. | Limestone powder or alkalised alumina |
| C. | Silica gel |
| D. | Active carbon |
| Answer» C. Silica gel | |
| 221. |
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called%! |
| A. | Thermosphere |
| B. | Stratosphere |
| C. | Troposphere |
| D. | Mesosphere |
| Answer» C. Troposphere | |
| 222. |
Maximum allowable concentration of CO‚ÇÇ in air for safe working is __________ ppm (parts per million).%! |
| A. | 50 |
| B. | 1000 |
| C. | 2000 |
| D. | 5000 |
| Answer» E. | |
| 223. |
Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.%! |
| A. | 105 |
| B. | 135 |
| C. | 160 |
| D. | 185 |
| Answer» C. 160 | |
| 224. |
Out of the following, TLV of __________ is maximum (about 500 ppm).%! |
| A. | Carbon dioxide |
| B. | Toluene |
| C. | Carbon disulphide |
| D. | Acetaldehyde |
| Answer» B. Toluene | |
| 225. |
*$_High noise levels produced during operation of fans and compressors can be reduced by using? |
| A. | Mufflers (silencers) |
| B. | Accoustical absorbent |
| C. | Lagging of noisy duct |
| D. | None of these |
| Answer» B. Accoustical absorbent | |
| 226. |
*$_Reingleman chart No. 2 corresponds to __________ percent black smoke.? |
| A. | 10 |
| B. | 20 |
| C. | 40 |
| D. | 80 |
| Answer» D. 80 | |
| 227. |
*$_Presence of nitrates in water in excess of 50 ppm causes? |
| A. | Mathenoglobenemia |
| B. | Gastroentetitis |
| C. | Asphyxiation |
| D. | Tooth decay |
| Answer» B. Gastroentetitis | |
| 228. |
*$_A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called? |
| A. | Cesspool |
| B. | Lagoon |
| C. | Skimming mill |
| D. | Septic tank |
| Answer» E. | |
| 229. |
*$_Dust collection efficiency of a cyclone separator depends upon its? |
| A. | Diameter |
| B. | Inlet gas velocity |
| C. | Overall height |
| D. | All of the above |
| Answer» E. | |
| 230. |
*$_The pH value of potable water should be between? |
| A. | 1 to 1.5 |
| B. | 6.5 to 8 |
| C. | 13 to 14 |
| D. | 4 to 5 |
| Answer» C. 13 to 14 | |
| 231. |
*$_Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?? |
| A. | Sedimentation tank |
| B. | Circular clarifier |
| C. | Mechanical flocculation |
| D. | Chemical coagulation |
| Answer» E. | |
| 232. |
*$_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 | |
| 233. |
*$_Removal of __________ results from the disinfection of water.? |
| A. | Turbidity |
| B. | Odour |
| C. | Hardness |
| D. | Bacteria |
| Answer» E. | |
| 234. |
*$_Aerobic biological oxidation ponds used for the purification of polluted water? |
| A. | Destroys/removes pathogen from the sewage |
| B. | Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents |
| C. | Destroys/removes pathogen much more effectively if the sewage is chlorinated |
| D. | All of the above |
| Answer» E. | |
| 235. |
*$_Ozone is? |
| A. | A primary pollutant |
| B. | A secondary pollutant |
| C. | Impervious to ultra-violet rays |
| D. | Both B & C |
| Answer» E. | |
| 236. |
*$_Soluble silica present in boiler feed water can be removed by? |
| A. | Coagulation |
| B. | Filtration |
| C. | Anion exchanger |
| D. | Preheating it |
| Answer» D. Preheating it | |
| 237. |
*/*_Which of the following plants does not emit appreciable amount of SO‚ÇÇ in atmosphere?? |
| A. | Thermal power plant |
| B. | Petroleum refinery |
| C. | Nitric acid plant |
| D. | Sulphuric acid plant |
| Answer» D. Sulphuric acid plant | |
| 238. |
*/*_Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by? |
| A. | Chemical coagulation |
| B. | Floatation & skimming |
| C. | Centrifugation |
| D. | Ultrafiltration |
| Answer» B. Floatation & skimming | |
| 239. |
*/*_Presence of excess flourine in water causes? |
| A. | Dental cavity |
| B. | Tooth decay |
| C. | Fluorosis |
| D. | Respiratory disease |
| Answer» D. Respiratory disease | |
| 240. |
*/*_Which of the following acts as a natural source of air pollution?? |
| A. | Forest fire |
| B. | Deforestation |
| C. | Volcanic eruption |
| D. | None of these |
| Answer» D. None of these | |
| 241. |
*/*_TLV of mercury in potable (drinking) water is about __________ ppm.? |
| A. | 0.001 |
| B. | 0.1 |
| C. | 1 |
| D. | 5 |
| Answer» B. 0.1 | |
| 242. |
*/*_Inorganic impurities causing water pollution is? |
| A. | Fats |
| B. | Carbohydrates |
| C. | Salts of metals |
| D. | Protein |
| Answer» D. Protein | |
| 243. |
*/*_The widest explosive limit is of __________ , thereby making it the most explosive gas.? |
| A. | Acetylene |
| B. | Petrol vapor |
| C. | Hydrogen |
| D. | Carbon monoxide |
| Answer» B. Petrol vapor | |
| 244. |
*/*_Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by? |
| A. | Natural aeration of water stream |
| B. | Photosynthetic action of algae |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 245. |
*/*_'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the? |
| A. | Industrial chimney exhaust |
| B. | Automobiles exhaust |
| C. | Photochemical reaction in polluted atmosphere |
| D. | Burning of domestic fuel |
| Answer» C. Photochemical reaction in polluted atmosphere | |
| 246. |
*/*_Removal of __________ is accomplished by aeration of water.? |
| A. | Dissolved gases |
| B. | Suspended solids |
| C. | Dissolved solids |
| D. | None of these |
| Answer» B. Suspended solids | |
| 247. |
*/*_A man exposed to excessive noise level in the working environment may suffer from? |
| A. | Hearing loss |
| B. | Rupture of ear drum |
| C. | Nervousness & fatigue |
| D. | All of the above |
| Answer» E. | |
| 248. |
*/*_Presence of a certain minimum quantity of flourine is desirable in potable water to prevent? |
| A. | Dental cavities |
| B. | Scale formation |
| C. | Water-borne disease |
| D. | Corrosion |
| Answer» B. Scale formation | |
| 249. |
*/*_Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m²/hr.? |
| A. | 0.1 to 1 |
| B. | 3 to 6 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» C. 10 to 15 | |
| 250. |
*/*_Photochemical smog is formed from automobile exhaust? |
| A. | By reaction of hydrocarbon & nitric oxide in presence of sunlight |
| B. | Appears only on sunny days |
| C. | Is harmful for crops and trees also besides causing eye irritation & asthma |
| D. | All of the above |
| Answer» E. | |