McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 251. |
Percussion drilling is unsuitable in |
| A. | Unconsolidated sand |
| B. | Unconsolidated gravel |
| C. | Quick sand |
| D. | Consolidated rocks |
| Answer» D. Consolidated rocks | |
| 252. |
Rapid gravity filters can remove bacterial impurities up to a maximum of |
| A. | 50 % |
| B. | 60 % |
| C. | 70 % |
| D. | 80 % |
| Answer» D. 80 % | |
| 253. |
Continuous flow of water can be expected from |
| A. | Gravity springs |
| B. | Surface springs |
| C. | Artesian springs |
| D. | None of these |
| Answer» C. Artesian springs | |
| 254. |
Reciprocating pumps |
| A. | Are not suitable for variable heads |
| B. | Are four times costlier than centrifugal pumps |
| C. | Are not suitable for pumping water containing sediments |
| D. | Single stroke produce pulsating flow |
| Answer» A. Are not suitable for variable heads | |
| 255. |
Low turbidity of water is detected by |
| A. | Turbidity tube |
| B. | Jackson turbidity meter |
| C. | Baylis turbidimeter |
| D. | Hellige turbidimeter |
| Answer» C. Baylis turbidimeter | |
| 256. |
Silt storage is the same as |
| A. | Dead storage |
| B. | Live storage |
| C. | Effective storage |
| D. | None of these |
| Answer» A. Dead storage | |
| 257. |
The type of pipe commonly used in water supply distribution schemes, is |
| A. | R.C.C. pipes |
| B. | Hume pipes |
| C. | Cast iron pipes |
| D. | G.I. pipes |
| Answer» C. Cast iron pipes | |
| 258. |
Pick up the incorrect statement from the following. The source of surface water is from |
| A. | Streams and rivers |
| B. | Storage reservoirs |
| C. | Springs |
| D. | Ponds and lakes |
| Answer» C. Springs | |
| 259. |
The discharge Q = 2𝜋𝐾𝐻𝑆/2.3 log10 (R/rw) for the confined tube well is obtained from |
| A. | Thiem's formula |
| B. | Darcy's formula |
| C. | Tolman's formula |
| D. | Dupuits formula |
| Answer» D. Dupuits formula | |
| 260. |
m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by |
| A. | Velocity area method |
| B. | Weir or spillway method |
| C. | Use of venturi-meter |
| D. | Using power plant consumption |
| Answer» A. Velocity area method | |
| 261. |
In a rapid gravity filter |
| A. | Raw water from the source is supplied |
| B. | Disinfected raw water is supplied |
| C. | Raw water passed through coagulation tank is supplied |
| D. | None of these |
| Answer» C. Raw water passed through coagulation tank is supplied | |
| 262. |
The maximum permissible nitrites in public water supplies, is |
| A. | Nil |
| B. | 0.5 P.P.M. |
| C. | 1.0. P.P.M. |
| D. | 1.5 P.P.M. |
| Answer» A. Nil | |
| 263. |
Most commonly used section in grade aqueducts, is |
| A. | Circular |
| B. | Rectangular |
| C. | Parabolic |
| D. | Horse shoe section |
| Answer» B. Rectangular | |
| 264. |
The most important and widely used tube well in India, is |
| A. | Strainer well |
| B. | Cavity well |
| C. | Slotted well |
| D. | Perforated pipe well |
| Answer» A. Strainer well | |
| 265. |
Critical time for developing a water hammer, is the time required for |
| A. | Closing the valve |
| B. | The wave to travel from valve to the reservoir |
| C. | The wave to travel from the valve to the reservoir and back |
| D. | None of these |
| Answer» C. The wave to travel from the valve to the reservoir and back | |
| 266. |
Bacterias which can survive with or without free oxygen, are known |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Facultative bacterias |
| D. | None of these |
| Answer» C. Facultative bacterias | |
| 267. |
The standard B.O.D. at 20°C, is taken for the consumption in |
| A. | 2 days |
| B. | 3 days |
| C. | 4 days |
| D. | 5 days |
| Answer» D. 5 days | |
| 268. |
Distribution of wash water is provided in |
| A. | Sedimentation tank |
| B. | Slow sand filter |
| C. | Rapid gravity filter |
| D. | All the above |
| Answer» C. Rapid gravity filter | |
| 269. |
If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula Q = 1135 [(P/5) + 10] is suggested by |
| A. | National Board of fire under-writers |
| B. | Freeman |
| C. | Kuichling |
| D. | None of these |
| Answer» B. Freeman | |
| 270. |
During treatment of water, sedimentation is done |
| A. | Before filtration |
| B. | After filtration |
| C. | Simultaneously with filtration |
| D. | Along with chlorination |
| Answer» A. Before filtration | |
| 271. |
The ratio of the maximum daily consumption to the average daily demand, is |
| A. | 1.0 |
| B. | 1.2 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 272. |
From the surface of reservoir, evaporation may be minimized by sprinkling |
| A. | Spirit |
| B. | Hydrochloric acid |
| C. | Acetyl alcohol |
| D. | Methane |
| Answer» C. Acetyl alcohol | |
| 273. |
The transitional middle portion of a logistic curve follows |
| A. | A geometric growth |
| B. | A logarithmic growth |
| C. | A first over curve |
| D. | A constant rate |
| Answer» D. A constant rate | |
| 274. |
For plain chlorination of water, the quantity of chlorine used, is |
| A. | 0.1 mg/litre |
| B. | 0.2 mg/litre |
| C. | 0.3 mg/litre |
| D. | 0.5 mg/litre |
| Answer» D. 0.5 mg/litre | |
| 275. |
In distribution pipes, air valves are provided at |
| A. | Lower points |
| B. | Junction points |
| C. | Higher points |
| D. | Anywhere |
| Answer» C. Higher points | |
| 276. |
Manholes along the mains from the source to a city are provided at 500 m intervals in |
| A. | Steel pipes |
| B. | R.C.C. pipes |
| C. | Hume steel pipes |
| D. | All the above |
| Answer» D. All the above | |
| 277. |
The maximum permissible colour for domestic supplies based on cobalt scale, is |
| A. | 5 ppm |
| B. | 10 ppm |
| C. | 15 ppm |
| D. | 20 ppm |
| Answer» D. 20 ppm | |
| 278. |
Increase in population of a rapidly growing city, may be estimated by |
| A. | Arithmetical mean method |
| B. | Geometrical method |
| C. | Incremental increase method |
| D. | Graphical comparison method |
| Answer» B. Geometrical method | |
| 279. |
Per capita demand of water is calculated in litres |
| A. | Per person per day |
| B. | Per person per month |
| C. | Per person per year |
| D. | None of these |
| Answer» A. Per person per day | |
| 280. |
Hard water for public water supply is discarded because |
| A. | ) It consumes more soap |
| B. | It contains lot of turbidity |
| C. | It contains pathogenic bacterias |
| D. | It possesses bad taste and odour |
| Answer» A. ) It consumes more soap | |
| 281. |
Pick up the incorrect statement from the following: |
| A. | Iron salts produce heavy flocks and hence remove more suspended matter |
| B. | Iron salts remove hydrogen sulphides |
| C. | Iron salts can be used over a limited range of pH values |
| D. | Iron salts impart corrosiveness to water |
| Answer» C. Iron salts can be used over a limited range of pH values | |
| 282. |
Asbestos pipes are |
| A. | Light in weight and easy to transport |
| B. | Highly resistant to corrosion |
| C. | High flexible to accommodate deflection upto 12° |
| D. | All the above |
| Answer» D. All the above | |
| 283. |
A strainer type well sunk through three previous layers intervened by three impervious aquicludes, draws water from |
| A. | Top most pervious layer |
| B. | Central pervious layer |
| C. | Lowest pervious layer |
| D. | All the pervious layers |
| Answer» D. All the pervious layers | |
| 284. |
Runoff is the quantity of water which flows |
| A. | In sewer pipes |
| B. | Due to leakage in pipes |
| C. | In rivers |
| D. | None of these |
| Answer» C. In rivers | |
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