McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering , Mechanical Engineering .
| 351. |
Which of the following chemical is least poisonous? |
| A. | Mercury |
| B. | Cyanide |
| C. | Arsenic |
| D. | Lead |
| E. | Sodium |
| Answer» E. Sodium | |
| 352. |
Disinfection of drinking water means removal of |
| A. | Bacteria |
| B. | Colour |
| C. | Odour |
| D. | Turbidity |
| E. | Oxygen |
| Answer» A. Bacteria | |
| 353. |
The hardness limit for portable water ranges between |
| A. | 10 - 50 ppm |
| B. | 300 - 700 ppm |
| C. | 75 - 117 ppm |
| D. | 150 - 250 ppm |
| E. | 50 - 65 ppm |
| Answer» C. 75 - 117 ppm | |
| 354. |
The process used for the removal of dissolved carbondioxide from the water, is known as |
| A. | Coagulation |
| B. | Sedimentation |
| C. | Aeration |
| D. | Zeolitc |
| E. | Agitation |
| Answer» C. Aeration | |
| 355. |
Which of the following automobile will provide least pollution problems |
| A. | Battery powered |
| B. | Petrol engine powered |
| C. | Gas turbine powered |
| D. | Diesel engine powered |
| E. | Wankel engine powered |
| Answer» A. Battery powered | |
| 356. |
The permissible level of HCN in drinking water is |
| A. | More than 50 mg/litre |
| B. | Around 1 mg/litre |
| C. | Less than 0.01 mg/litre |
| D. | Between 10 to 20 mg/litre |
| E. | Around 5 mg/litre |
| Answer» C. Less than 0.01 mg/litre | |
| 357. |
The chloride content in the water for public supplies should not exceed |
| A. | 1 mg/litre |
| B. | 250 mg/litre |
| C. | 50 mg/litre |
| D. | 20 mg/litre |
| E. | 100 mg/litre |
| Answer» B. 250 mg/litre | |
| 358. |
The most frequent method of bacterial reproduction is by |
| A. | The formation of spores |
| B. | Budding |
| C. | Cell division |
| D. | Colony formation |
| E. | Sexual process |
| Answer» C. Cell division | |
| 359. |
Bit is the unit of |
| A. | Quantity of electricity |
| B. | Intensity of an earthquake |
| C. | None of these |
| D. | Memory of computer |
| E. | Amount of rain recorded |
| Answer» D. Memory of computer | |
| 360. |
Dark, black smoke from diesel engines usually results when engine is |
| A. | Running at light loads |
| B. | Running at slow speeds |
| C. | Running at full load and full speed |
| D. | Idling |
| E. | Running at full speed but under load conditions |
| Answer» C. Running at full load and full speed | |
| 361. |
Which one among the following terms best describes the method of converting a spherical surface into a plane surface? |
| A. | Projection |
| B. | Cartography |
| C. | None of these |
| D. | Geodesy |
| E. | Photogrammetry |
| Answer» A. Projection | |
| 362. |
The permissible hardness of water for public supplies is |
| A. | 400 mg/litre |
| B. | 10 mg/litre |
| C. | 25 mg/litre |
| D. | 75 mg/litre |
| E. | 115 mg/litre |
| Answer» E. 115 mg/litre | |
| 363. |
What will be the colour of red rose when it is seen through green glass? |
| A. | Pink |
| B. | White |
| C. | Brown |
| D. | Green |
| E. | Black |
| Answer» C. Brown | |
| 364. |
Identify the incorrect statement if any Zeolite process is suitable for |
| A. | When zeolite becomes inactive, it may be reactivated by flushing with brine solution |
| B. | Removing temporary hardness |
| C. | Removing permanent hardness |
| D. | Acidic waters |
| E. | Cent percent removal of hardness |
| Answer» D. Acidic waters | |
| 365. |
Which of the following constituent of air has the least percentage? |
| A. | Helium |
| B. | Carbon dioxide |
| C. | Xenon |
| D. | Neon |
| E. | Argon |
| Answer» C. Xenon | |
| 366. |
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. | Chlorine content is high in water |
| D. | Water is alkaline |
| E. | Organic matter is present in water |
| Answer» E. Organic matter is present in water | |
| 367. |
Which one of the following gases shows a different behaviour at high pressure? |
| A. | Ozone |
| B. | Hydrogen |
| C. | Carbon dioxide |
| D. | Water vapours |
| E. | None of these |
| Answer» B. Hydrogen | |
| 368. |
Bleaching power is |
| A. | Stacked lime |
| B. | Hypo-chloride of lime |
| C. | Chloride of lime |
| D. | Hypo-chlorite of lime |
| E. | Lime |
| Answer» D. Hypo-chlorite of lime | |
| 369. |
The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is |
| A. | 10 |
| B. | 1 |
| C. | 2 |
| D. | 5 |
| E. | 3 |
| Answer» E. 3 | |
| 370. |
The percentage of nitrogen in air by weight is around |
| A. | 24.3 percent |
| B. | 23.1 percent |
| C. | 65.5 percent |
| D. | 75.5 percent |
| E. | 20.3 percent |
| Answer» D. 75.5 percent | |
| 371. |
What is a laser? |
| A. | Electro-magnetic waves |
| B. | Light amplification by stimulated emission of radiation |
| C. | Supersonic waves |
| D. | Green |
| E. | Ultrasonic waves |
| Answer» B. Light amplification by stimulated emission of radiation | |
| 372. |
The permissible hardness of water for low pressure boiler is |
| A. | 150 mg/litre |
| B. | 50 mg/litre |
| C. | 350 kg/litre |
| D. | 250 mg/litre |
| E. | 450 mg/litre |
| Answer» B. 50 mg/litre | |
| 373. |
To keep the water safe against pathogenetic bacteria the residual chlorine should remain between |
| A. | 10 ppm to 20 ppm |
| B. | 1 ppm to 2 ppm |
| C. | 0.2 to 0.8 ppm |
| D. | 0.05 to 0.2 ppm |
| E. | 6 ppm to 10 ppm |
| Answer» D. 0.05 to 0.2 ppm | |
| 374. |
Which of the following industry is least polluting? |
| A. | Rolling mills |
| B. | Oil refinery |
| C. | Cement industry |
| D. | Thermal power plants |
| E. | Electronic industry |
| Answer» E. Electronic industry | |
| 375. |
The pH value of sea water is usually |
| A. | Between 3 and 5 |
| B. | 1 |
| C. | Between 8 and 8.3 |
| D. | Between 13.7 and 14 |
| E. | Between 5 and 7 |
| Answer» C. Between 8 and 8.3 | |
| 376. |
The pH value of concentrated sulphuric acid could be expected between |
| A. | 6 and 5 |
| B. | 7 and 6 |
| C. | 1 and 0 |
| D. | 4 and 3 |
| E. | 3 and 1 |
| Answer» C. 1 and 0 | |
| 377. |
Ultra-violet rays are used for the treatment of water known as |
| A. | Dechlorination |
| B. | Aeration |
| C. | Disinfection |
| D. | Filtration |
| E. | Bleaching |
| Answer» C. Disinfection | |
| 378. |
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. | Chlorination |
| D. | Aeration |
| E. | Sterilization |
| Answer» E. Sterilization | |
| 379. |
In one litre sample of drinking water the coliform organism should not exceed |
| A. | 1 |
| B. | 100 |
| C. | 10 |
| D. | 1000 |
| E. | 500 |
| Answer» C. 10 | |
| 380. |
Turbidity in water may be removed by |
| A. | Aeration |
| B. | Sedimentation |
| C. | Oxidation |
| D. | Filtration |
| E. | Agitation |
| Answer» B. Sedimentation | |
| 381. |
Which one of the following is not directly related to the phenomenon of evaporation? |
| A. | None of these |
| B. | Temperature of liquid |
| C. | Surface winds over the liquid |
| D. | Volume of the liquid |
| E. | Surface area of the liquid |
| Answer» D. Volume of the liquid | |
| 382. |
For the maximum acidity of water, pH value would be |
| A. | 0.1 |
| B. | 10 |
| C. | 1 |
| D. | 0.01 |
| E. | 11 |
| Answer» D. 0.01 | |
| 383. |
The process of passing the water through a thick layer of filtering media is known as |
| A. | Sedimentation |
| B. | Disinfection |
| C. | Putrification |
| D. | Filtration |
| E. | Purification |
| Answer» D. Filtration | |
| 384. |
In case of public supplies, the maximum permissible nitrite content is |
| A. | 250 ppm |
| B. | 100 ppm |
| C. | 50 ppm |
| D. | 200 ppm |
| E. | zero ppm |
| Answer» E. zero ppm | |
| 385. |
The presence of which of the following material in water is not considered to be dangerous? |
| A. | Copper |
| B. | Zinc |
| C. | Mercury |
| D. | Calcium |
| E. | Lead |
| Answer» D. Calcium | |
| 386. |
The desirable temperature of portable water is |
| A. | 10?C |
| B. | 37?C |
| C. | 27?C |
| D. | zero degree centigrade |
| E. | 20?C |
| Answer» A. 10?C | |
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