MCQOPTIONS
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MCQOPTIONS
This section includes 641 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
For detecting the nitrites in the sewage, the matching colour may be developed by adding_________________? |
| A. | Potassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di -sulphuric acid potassium hydroxide |
| D. | None of these |
| Answer» C. Phenol-di -sulphuric acid potassium hydroxide | |
| 252. |
For detecting the nitrates in sewage, the colour may be developed by adding________________? |
| A. | Potassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di -sulphuric acid and potassium hydroxide |
| D. | None of these |
| Answer» D. None of these | |
| 253. |
For design purposes, the normal rate of infiltration of ground water into the sewer, is___________________? |
| A. | 500 litres/km/cm |
| B. | 1000 litres/km/cm |
| C. | 1500 litres/km/cm |
| D. | 2000 litres/km/cm |
| Answer» E. | |
| 254. |
For design of sewers, percentage of sewage discharge is assumed_____________________? |
| A. | 65 to 70% |
| B. | 70 to 75% |
| C. | 75 to 80% |
| D. | 85% |
| Answer» D. 85% | |
| 255. |
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________? |
| A. | 10 cm |
| B. | 12 cm |
| C. | 15 cm |
| D. | 18 cm |
| Answer» D. 18 cm | |
| 256. |
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is__________________? |
| A. | 16 m |
| B. | 20 m |
| C. | 24 m |
| D. | 30 m |
| Answer» D. 30 m | |
| 257. |
For a continuous flow type of sedimentation tanks__________________? |
| A. | Width of the tank is normally kept about 6 m |
| B. | Length of the tank is normally kept 4 to 5 times the width |
| C. | Maximum horizontal flow velocity is limited to 0.3 m/minute |
| D. | All the above |
| Answer» E. | |
| 258. |
Flocculated particles do not change their___________________? |
| A. | Size |
| B. | Shape |
| C. | Weight |
| D. | None of these |
| Answer» E. | |
| 259. |
Facultative bacteria survive in_____________________? |
| A. | The presence of oxygen |
| B. | The absence of oxygen |
| C. | Both cases A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 260. |
During purification process of sewage the gas given off, is________________? |
| A. | Carbon dioxide |
| B. | Hydrogen |
| C. | Ammonia |
| D. | All the above |
| Answer» E. | |
| 261. |
Dry weather flow is__________________? |
| A. | Average daily rate of flow |
| B. | Average monthly rate of flow |
| C. | Average annual rate of flow |
| D. | Water supply allowance per capital |
| Answer» E. | |
| 262. |
Dry water flow in a combined sewer, is______________________? |
| A. | Industrial sewage |
| B. | Domestic sewage |
| C. | Storm water |
| D. | Inclusive of domestic and industrial sewage but excludes storm water |
| Answer» D. Inclusive of domestic and industrial sewage but excludes storm water | |
| 263. |
Drop manholes at the junctions of sewer lines, are provided if________________? |
| A. | Invert level of a branch sewer is more than 60 cm that of the main sewer |
| B. | Sewer line runs along a main road |
| C. | Ordinary manhole cannot be built |
| D. | Two sewer lines intersect |
| Answer» B. Sewer line runs along a main road | |
| 264. |
Drop manholes are the manholes___________________? |
| A. | Without entry ladders |
| B. | Without manhole covers |
| C. | With depths more than 3.5 m |
| D. | Having drains at different levels |
| Answer» E. | |
| 265. |
Dried sewage after treatment is used as____________________? |
| A. | Fertilizer |
| B. | Building material |
| C. | Chemical for lowering B.O.D. |
| D. | Base material for paints |
| Answer» B. Building material | |
| 266. |
Disposal to sewage in large cities, is done in__________________? |
| A. | Irrigation |
| B. | Dilution |
| C. | Oxidation |
| D. | Purification |
| Answer» C. Oxidation | |
| 267. |
Discrete or granular particles change their_________________ ? |
| A. | Size |
| B. | Shape |
| C. | Weight |
| D. | None of these |
| Answer» E. | |
| 268. |
Dilution method of disposing of sewage, is not preferred to_______________? |
| A. | When sewage is fresh |
| B. | When diluting water has high dissolved oxygen content |
| C. | When diluting water is used for water supply near the point of sewage disposed |
| D. | When the diluting water is having flow currents |
| Answer» D. When the diluting water is having flow currents | |
| 269. |
Design period of 40 to 50 years is adopted for_________________? |
| A. | Branch sewers |
| B. | Main sewers |
| C. | Trunk sewers |
| D. | All the above |
| Answer» E. | |
| 270. |
Depletion of ozone layer in the outer atmosphere may cause___________________ ? |
| A. | Lung cancer |
| B. | Skin cancer |
| C. | Bronchitis |
| D. | Heart disorder |
| Answer» C. Bronchitis | |
| 271. |
‘Cowl’ is provided at___________________? |
| A. | Lower end of ventilating column |
| B. | Upper end of ventilating column |
| C. | Upper end of the manhole |
| D. | First step in manhole |
| Answer» C. Upper end of the manhole | |
| 272. |
Clogging of sewers, is caused due to_______________? |
| A. | Silting |
| B. | Low discharge |
| C. | Greasy and oily matters |
| D. | All the above |
| Answer» E. | |
| 273. |
Chlorination of water is done for the removal of____________________? |
| A. | Bacterias |
| B. | Suspended solids |
| C. | Sediments |
| D. | Hardness |
| Answer» B. Suspended solids | |
| 274. |
Cement concrete sewers are only suitable if non-scouring velocity is between_________________? |
| A. | 2.5 to 3.0 m/sec |
| B. | 3.0 to 4.0 m/sec |
| C. | 3.5 to 4.5 m/sec |
| D. | 4.5 to 5.5 m/sec |
| Answer» B. 3.0 to 4.0 m/sec | |
| 275. |
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________? |
| A. | pt = 3H3p/2 Z5 |
| B. | pt = 2H3p/3 Z5 |
| C. | pt = 3H3p/2Z5 |
| D. | pt = 2 3p/3Z5 |
| Answer» B. pt = 2H3p/3 Z5 | |
| 276. |
Bottom openings 15 cm × 15 cm in the standing baffle wall are provided________________? |
| A. | 15 cm c/c |
| B. | 22.5 cm c/c |
| C. | 30 cm c/c |
| D. | 50 cm c/c |
| Answer» C. 30 cm c/c | |
| 277. |
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to_______________? |
| A. | Initial demand |
| B. | First stage demand |
| C. | Carbonaceous demand |
| D. | All of these |
| Answer» E. | |
| 278. |
Before discharging the foul sewage into rivers, it is generally treated by_____________________? |
| A. | Screening |
| B. | Sedimentation |
| C. | Oxidation |
| D. | All the above |
| Answer» E. | |
| 279. |
At the junction of sewers___________________? |
| A. | Top of smaller sewer is kept lower |
| B. | Top of larger sewer is kept lower |
| C. | Tops of both the sewers are at the same level |
| D. | None of these |
| Answer» E. | |
| 280. |
Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer? |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 281. |
Assertion A.: The determination of pH value of sewerage is important. Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value________________? |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 282. |
Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________? |
| A. | Both A and R are true and R is the correct explanation of A |
| B. | Both A and R are true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not a correct explanation of A | |
| 283. |
Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________? |
| A. | Both A and R is true and R is the correct explanation of A |
| B. | Both A and R is true but R is not a correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R is true but R is not a correct explanation of A | |
| 284. |
As compared to fresh river water, sea water contains oxygen_________________? |
| A. | 10% less |
| B. | 20% less |
| C. | 10% more |
| D. | 20% more |
| Answer» C. 10% more | |
| 285. |
are available in size Stoneware sewers________________? |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | All the above |
| Answer» E. | |
| 286. |
Antisyphonage pipe is fitted_______________? |
| A. | At the end of septic tanks |
| B. | On manholes |
| C. | With a W.C. trap |
| D. | At the beginning of sewer line |
| Answer» D. At the beginning of sewer line | |
| 287. |
An inverted siphon is designed generally for____________________? |
| A. | One pipe |
| B. | Two pipes |
| C. | Three pipes |
| D. | Four pipes |
| Answer» D. Four pipes | |
| 288. |
Aerobic bacterias___________________? |
| A. | Flourish in the presence of free oxygen |
| B. | Consume organic matter as their food |
| C. | Oxidise organic matter in sewage |
| D. | All the above |
| Answer» E. | |
| 289. |
Aerobic activity is maximum_______________? |
| A. | In freshly produced sewage |
| B. | At sewer pipes |
| C. | In sewer treatment plants |
| D. | None of these |
| Answer» B. At sewer pipes | |
| 290. |
Acid regression stage of sludge digestion at a temperature 21°C extends over a period of______________? |
| A. | 15 days |
| B. | 30 days |
| C. | 60 days |
| D. | 90 days |
| Answer» E. | |
| 291. |
A well oxidized sewage contains nitrogen mainly as___________________? |
| A. | Nitrates |
| B. | Nitrites |
| C. | Free ammonia |
| D. | None of these |
| Answer» B. Nitrites | |
| 292. |
A sewer running partially full and hurried with back filled, fails in compression due to_________________? |
| A. | Weight of the pipe |
| B. | Weight of the back fill |
| C. | Superimposed traffic loads |
| D. | All the above |
| Answer» E. | |
| 293. |
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________? |
| A. | 0.30 m/sec |
| B. | 0.35 m/sec |
| C. | 0.40 m/sec |
| D. | 0.45 m/sec |
| Answer» E. | |
| 294. |
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________? |
| A. | Carbondioxide gas |
| B. | Hydrogen sulphide gas |
| C. | Methane gas |
| D. | Petrol vapours |
| Answer» D. Petrol vapours | |
| 295. |
A rainfall may be classified as acidic if its pH value is less or equal to________________? |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 6.5 |
| Answer» D. 6.5 | |
| 296. |
A rain sanitary sewer is constructed to carry_________________ ? |
| A. | Sanitary sewage |
| B. | Storm sewage |
| C. | Surface water |
| D. | Ground water |
| Answer» B. Storm sewage | |
| 297. |
A nuisance is experienced in diluting water if dilution factor is less than_________________? |
| A. | 100 |
| B. | 60 |
| C. | 40 |
| D. | 20 |
| Answer» E. | |
| 298. |
A manhole is generally provided at each__________________? |
| A. | Bend |
| B. | Junction |
| C. | Change of gradient |
| D. | All the above |
| Answer» E. | |
| 299. |
A manhole is classified as shallow if its depth is between_________________? |
| A. | 0.4 to 0.5 m |
| B. | 0.5 to 0.7 m |
| C. | 0.7 to 0.9 m |
| D. | 0.9 to 1.20 m |
| Answer» D. 0.9 to 1.20 m | |
| 300. |
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________? |
| A. | 100 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» E. | |