McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
| 251. |
The disadvantage of hard water is |
| A. | More soap consumption |
| B. | Scale formation in boilers |
| C. | Corrosion of pipes |
| D. | Loss of taste in food |
| E. | All of the above |
| Answer» E. All of the above | |
| 252. |
The permissible hardness of water for public supplies is |
| A. | 10 mg/litre |
| B. | 25 mg/litre |
| C. | 75 mg/litre |
| D. | 115 mg/litre |
| E. | 400 mg/litre |
| Answer» D. 115 mg/litre | |
| 253. |
For the combustion of 1 kg of carbon, the quantity of oxygen required is |
| A. | 2.62 kg |
| B. | 3.67 kg |
| C. | 8 kg |
| D. | 11.6 kg |
| E. | None of the above |
| Answer» A. 2.62 kg | |
| 254. |
For controlling algae, the chemical generally used is |
| A. | alum |
| B. | lime |
| C. | copper sulphate |
| D. | bleaching powder |
| E. | None of the above |
| Answer» C. copper sulphate | |
| 255. |
Soft waters |
| A. | Have corrosive action on metals |
| B. | Dissolve lead |
| C. | Corrode iron |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 256. |
What will be the colour of red rose when it is seen through green glass? |
| A. | White |
| B. | Black |
| C. | Pink |
| D. | Brown |
| E. | Green |
| Answer» D. Brown | |
| 257. |
Acute poisoning may be the result of entry into the body of large of concentrated doses of poison through |
| A. | Breathing |
| B. | Swalowing |
| C. | Skin absorption |
| D. | Injection |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 258. |
Carbondioxide has all the following properties EXCEPT that it is |
| A. | colourless |
| B. | odourless |
| C. | tasteless |
| D. | readily soluble in water |
| E. | None of the above |
| Answer» D. readily soluble in water | |
| 259. |
The number of air changes per hour recommended for auditoria is |
| A. | 3 to 6 |
| B. | 6 to 10 |
| C. | 10 to 12 |
| D. | 15 to 20 |
| E. | None of the above |
| Answer» A. 3 to 6 | |
| 260. |
Identify the incorrect statement if any Zeolite process is suitable for |
| A. | Removing temporary hardness |
| B. | Removing permanent hardness |
| C. | Cent percent removal of hardness |
| D. | Acidic waters |
| E. | When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
| Answer» D. Acidic waters | |
| 261. |
Which of the following constituent of air has the least percentage? |
| A. | Argon |
| B. | Carbon dioxide |
| C. | Xenon |
| D. | Neon |
| E. | Helium |
| Answer» C. Xenon | |
| 262. |
While smoke from a diesel engine can be expected during |
| A. | Start up or idling |
| B. | High load operating |
| C. | High speed operation |
| D. | All of the above |
| E. | None of the above |
| Answer» A. Start up or idling | |
| 263. |
If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that |
| A. | Water is hard |
| B. | Water is acidic |
| C. | Water is alkaline |
| D. | Organic matter is present in water |
| E. | Chlorine content is high in water |
| Answer» D. Organic matter is present in water | |
| 264. |
Plants that grow in absence of sublight in water, are called |
| A. | Algae |
| B. | Shrubs |
| C. | Fungi |
| D. | Any of the above |
| E. | All of the above |
| Answer» C. Fungi | |
| 265. |
Which one of the following gases shows a different behaviour at high pressure? |
| A. | Carbon dioxide |
| B. | Water vapours |
| C. | Hydrogen |
| D. | Ozone |
| E. | None of these |
| Answer» C. Hydrogen | |
| 266. |
Bleaching power is |
| A. | Lime |
| B. | Stacked lime |
| C. | Chloride of lime |
| D. | Hypo-chloride of lime |
| E. | Hypo-chlorite of lime |
| Answer» E. Hypo-chlorite of lime | |
| 267. |
The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
| A. | 10 |
| B. | 5 |
| C. | 3 |
| D. | 2 |
| E. | 1 |
| Answer» C. 3 | |
| 268. |
The percentage of nitrogen in air by weight is around |
| A. | 75.5 percent |
| B. | 65.5 percent |
| C. | 24.3 percent |
| D. | 23.1 percent |
| E. | 20.3 percent |
| Answer» A. 75.5 percent | |
| 269. |
What is a laser? |
| A. | Electro-magnetic waves |
| B. | Ultrasonic waves |
| C. | Supersonic waves |
| D. | Light amplification by stimulated emission of radiation |
| E. | Green |
| Answer» D. Light amplification by stimulated emission of radiation | |
| 270. |
All of the following pollutants affect heart EXCEPT |
| A. | Cadmium |
| B. | Arsenic |
| C. | Lead |
| D. | Carbon monoxide |
| E. | None of the above |
| Answer» B. Arsenic | |
| 271. |
The permissible hardness of water for low pressure boiler is |
| A. | 50 mg/litre |
| B. | 150 mg/litre |
| C. | 250 mg/litre |
| D. | 350 kg/litre |
| E. | 450 mg/litre |
| Answer» A. 50 mg/litre | |
| 272. |
Desalination is usually needed for |
| A. | well water |
| B. | rain water |
| C. | sea water |
| D. | river water |
| E. | None of the above |
| Answer» C. sea water | |
| 273. |
To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
| A. | 0.05 to 0.2 ppm |
| B. | 0.2 to 0.8 ppm |
| C. | 1 ppm to 2 ppm |
| D. | 6 ppm to 10 ppm |
| E. | 10 ppm to 20 ppm |
| Answer» A. 0.05 to 0.2 ppm | |
| 274. |
Which of the following industry is least polluting? |
| A. | Cement industry |
| B. | Oil refinery |
| C. | Thermal power plants |
| D. | Electronic industry |
| E. | Rolling mills |
| Answer» D. Electronic industry | |
| 275. |
Carbon monoxide poisoning may cause |
| A. | headache |
| B. | drowsiness |
| C. | dizziness |
| D. | Any of the above |
| E. | None of the above |
| Answer» D. Any of the above | |
| 276. |
When the trees are planted by road side, the average distance between two trees should be |
| A. | 2 to 3 metres |
| B. | 5 to 8 metres |
| C. | 10 to 15 metres |
| D. | 25 to 30 metres |
| E. | None of the above |
| Answer» C. 10 to 15 metres | |
| 277. |
Addition to alum increases |
| A. | hardness of water |
| B. | carbonates of water |
| C. | sulphates in water |
| D. | Acidity of water |
| E. | None of the above |
| Answer» D. Acidity of water | |
| 278. |
If the pH of water is 7 it means the water is |
| A. | acidic |
| B. | alkaline |
| C. | neutral |
| D. | free from oxygen |
| E. | None of the above |
| Answer» C. neutral | |
| 279. |
The volume fraction of ozone in atmospheric air is nearly |
| A. | 0.02 ppm |
| B. | 0.2 ppm |
| C. | 2 ppm |
| D. | 20 ppm |
| E. | None of the above |
| Answer» A. 0.02 ppm | |
| 280. |
Suspended liquid droplets generated by condensation from the gaseous to the liquid state or by breaking up a liquid into a dispersed state is known as |
| A. | Dust |
| B. | Fume |
| C. | Mist |
| D. | Vapours |
| E. | None of the above |
| Answer» C. Mist | |
| 281. |
The maximum acceptable noise level in offices is |
| A. | 10 dB |
| B. | 40 dB |
| C. | 75 dB |
| D. | 100 dB |
| E. | None of the above |
| Answer» B. 40 dB | |
| 282. |
Type of radiation expected from earbon 14 is |
| A. | Alpha |
| B. | Beta |
| C. | Gamma |
| D. | Alpha, Beta, Gamma |
| E. | None of the above |
| Answer» B. Beta | |
| 283. |
The pH value of sea water is usually |
| A. | 1 |
| B. | Between 3 and 5 |
| C. | Between 5 and 7 |
| D. | Between 8 and 8.3 |
| E. | Between 13.7 and 14 |
| Answer» D. Between 8 and 8.3 | |
| 284. |
Which of the following is the major source of pollutant hydrogen sulphide? |
| A. | Decaying organic matter |
| B. | Auto exhaust |
| C. | Oil burners |
| D. | Solar energy |
| E. | None of the above |
| Answer» A. Decaying organic matter | |
| 285. |
The pH value of concentrated sulphuric acid could be expected between |
| A. | 7 and 6 |
| B. | 6 and 5 |
| C. | 4 and 3 |
| D. | 3 and 1 |
| E. | 1 and 0 |
| Answer» E. 1 and 0 | |
| 286. |
Ultra-violet rays are used for the treatment of water known as |
| A. | Dechlorination |
| B. | Disinfection |
| C. | Aeration |
| D. | Filtration |
| E. | Bleaching |
| Answer» B. Disinfection | |
| 287. |
The process of kolling at the pathogenic bacteria of water-borne diseases to make it safe for hospital use, is known as |
| A. | Zeoliting |
| B. | Debacterialisation |
| C. | Sterilization |
| D. | Aeration |
| E. | Chlorination |
| Answer» C. Sterilization | |
| 288. |
Electric fuses provide protection against |
| A. | sparking |
| B. | overloads |
| C. | single phasing |
| D. | low current and voltage |
| E. | None of the above |
| Answer» B. overloads | |
| 289. |
In one litre sample of drinking water the coliform organism should not exceed |
| A. | 1000 |
| B. | 500 |
| C. | 100 |
| D. | 10 |
| E. | 1 |
| Answer» D. 10 | |
| 290. |
When the trees are to be planted by the road side the minimum distance from the out edge of side width should be |
| A. | 0.5 to 1 metre |
| B. | 2 to 3 metres |
| C. | 5 to 8 metres |
| D. | 12 to 15 metres |
| E. | None of the above |
| Answer» B. 2 to 3 metres | |
| 291. |
All of the following are souhd obsorptive materials EXCEPT |
| A. | Rugs |
| B. | Mirrors |
| C. | Carpets |
| D. | Heavy drapes |
| E. | None of the above |
| Answer» B. Mirrors | |
| 292. |
Which of the following pollutant results from decaying organic matter? |
| A. | Acetylene |
| B. | Ozone |
| C. | Ammonia |
| D. | Nitric oxide |
| E. | None of the above |
| Answer» C. Ammonia | |
| 293. |
All of the following pollutants result from auto-exhaust EXCEPT |
| A. | Acetylene |
| B. | Olefins |
| C. | Hydrogen sulphide |
| D. | Ethylene |
| E. | None of the above |
| Answer» A. Acetylene | |
| 294. |
Dust particles in industrial processes may be generated by |
| A. | Crushing |
| B. | Grinding |
| C. | Detonation |
| D. | Rapid impact |
| E. | Any of the above processes |
| Answer» E. Any of the above processes | |
| 295. |
Turbidity in water may be removed by |
| A. | Sedimentation |
| B. | Filtration |
| C. | Agitation |
| D. | Aeration |
| E. | Oxidation |
| Answer» A. Sedimentation | |
| 296. |
Which of the following area of work needs lowest level of illumination? |
| A. | Engraving |
| B. | Cloth inspection |
| C. | Assembly of instrument |
| D. | Paper converting processes |
| E. | None of the above |
| Answer» D. Paper converting processes | |
| 297. |
Which one of the following is not directly related to the phenomenon of evaporation? |
| A. | Temperature of liquid |
| B. | Volume of the liquid |
| C. | Surface area of the liquid |
| D. | Surface winds over the liquid |
| E. | None of these |
| Answer» B. Volume of the liquid | |
| 298. |
For the maximum acidity of water, pH value would be |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| E. | 11 |
| Answer» A. 0.01 | |
| 299. |
The process of passing the water through a thick layer of filtering media is known as |
| A. | Sedimentation |
| B. | Filtration |
| C. | Disinfection |
| D. | Purification |
| E. | Putrification |
| Answer» B. Filtration | |
| 300. |
Which of the following is an insect born disease? |
| A. | Q-fever |
| B. | Ring worm |
| C. | Jaundice |
| D. | Tetanus |
| E. | None of the above |
| Answer» A. Q-fever | |
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