McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
Fluorides in solution form are preferred over powdered form for fluoridation. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: fluorides in powdered form like sodium fluoride or sodium fluosilicate are toxic and must be contained in air tight containers. hence, they are not preferred. | |
| 152. |
What happens when water contains 8-20 ppm of fluoride concentration? |
| A. | blue baby disease |
| B. | crippling fluorosis |
| C. | dental fluorosis |
| D. | mottling of teeth |
| Answer» B. crippling fluorosis | |
| Explanation: dental fluorosis is caused when fluoride concentration is above 3 ppm, whereas crippling fluorosis is caused when the concentration of fluoride in water is between 8 and 20ppm. | |
| 153. |
The process of reducing the fluoride content from water is called |
| A. | chlorination |
| B. | fluoridation |
| C. | defluoridation |
| D. | flocculation |
| Answer» C. defluoridation | |
| Explanation: when the fluoride content in water is high, it is essential to reduce the fluoride content to avoid health related problems and the process of reducing the fluoride content is called defluoridation. | |
| 154. |
Which of the following is not used for defluoridation? |
| A. | calcium phosphate |
| B. | copper sulfate |
| C. | alum |
| D. | bone charcoal |
| Answer» B. copper sulfate | |
| Explanation: copper sulfate is used to remove taste, odor, color and control of algae growth and it is not used for fluoridation. | |
| 155. |
Which material is used in contact filters for the removal of fluorides? |
| A. | calcium phosphate |
| B. | copper sulfate |
| C. | synthetic tri-calcium phosphate |
| D. | bone charcoal |
| Answer» C. synthetic tri-calcium phosphate | |
| Explanation: synthetic tri-calcium phosphate is used in contact filters for the removal of fluorides. it is made from the milk of lime and phosphoric acid. | |
| 156. |
Which material is used for removing fluorides from hard water containing 3ppm of fluorides? |
| A. | lime |
| B. | copper sulfate |
| C. | synthetic tri-calcium phosphate |
| D. | bone charcoal |
| Answer» A. lime | |
| Explanation: lime is suitable for removing fluorides from hard water containing less than 4ppm. magnesium is also removed when this material is used for defluoridation. | |
| 157. |
Fluorex is a special mixture of |
| A. | di-calcium phosphate and carbon |
| B. | tri-calcium phosphate and hydroxyapatite |
| C. | di-calcium phosphate and phosphoric acid |
| D. | tri-calcium phosphate and carbon |
| Answer» B. tri-calcium phosphate and hydroxyapatite | |
| Explanation: fluorex is used for removing fluoride and it is a special mixture of tri- calcium phosphate and hydroxyapatite. it is used as a filter medium. | |
| 158. |
Which of the following is not a component of plumbing water supply system? |
| A. | washbasin |
| B. | water supply and distribution pipes |
| C. | valves |
| D. | storage tanks |
| Answer» A. washbasin | |
| Explanation: the plumbing system consists of the entire system of piping fixtures which are used for the supply and drainage of water. the various components of plumbing water supply system are water supply and distribution pipes, valves, storage tanks, etc. | |
| 159. |
Which of the following is not a component of the plumbing drainage system? |
| A. | water closets |
| B. | taps |
| C. | vent pipes |
| D. | urinals |
| Answer» B. taps | |
| Explanation: the different components of the plumbing drainage system are water closets, vent pipes, urinals, septic tanks, soil waste pipes, traps, etc. taps form the part of plumbing water supply system. | |
| 160. |
Light gauge copper tubes are used for general purpose work where the pressure is not more than 0.15 N/mm2. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: copper water service pipes are of two types. these are light gauge and heavy gauge. light gauge copper tubes are used for general purpose work where the pressure is not more than 0.15 n/mm2. | |
| 161. |
Which of the following is not true about lead pipes? |
| A. | lead pipes are highly resistant to corrosion |
| B. | they have a low hydraulic coefficient of flow |
| C. | lead pipes are highly flexible |
| D. | when lead goes into solution, it has a cumulative poisoning effect |
| Answer» B. they have a low hydraulic coefficient of flow | |
| Explanation: lead pipes have many advantages. they have a high hydraulic coefficient of flow and are highly resistant to corrosion. lead pipes are highly flexible. | |
| 162. |
Which of the following is not true about plastic pipes? |
| A. | plastic pipes are cheaper than the metal pipes |
| B. | plastic pipes are light in weight |
| C. | plastic pipes can be installed with ordinary tools |
| D. | plastic pipes are corrosive |
| Answer» D. plastic pipes are corrosive | |
| Explanation: plastic pipes are light in weight. ordinary tools are used to install plastic pipes. plastic pipes are non-corrosive and are cheaper than metal pipes. | |
| 163. |
is used to measure flows to domestic buildings. |
| A. | rain gauge |
| B. | water tank |
| C. | drainpipe |
| D. | water meter |
| Answer» D. water meter | |
| Explanation: water meter is used to measure flows to domestic buildings. a water meter should be easy to maintain and repair and it should measure and register both large and small flows accurately. | |
| 164. |
is used to measure the flow velocity across a cross-section with a known area. |
| A. | inferential meter |
| B. | anemometer |
| C. | speedometer |
| D. | barometer |
| Answer» A. inferential meter | |
| Explanation: there are generally two types of meters used in water distribution systems. these are inferential meter and displacement meter. the inferential meter is used to measure the flow velocity across a cross- section with a known area. | |
| 165. |
Inferential meters can be used for both low and high flows. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: inferential meters are used only for high flows. they are also known as velocity meters. for relatively low flows, displacement meters are used. | |
| 166. |
The method of distribution of water is divided into how many types? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| Explanation: the method of distribution of water is divided into 3 types and it includes gravity system, pumping system and combined gravity and pumping system. | |
| 167. |
In which of the following distribution system, the clean water flows entirely under gravity? |
| A. | gravity system |
| B. | pressure system |
| C. | combined gravity and pumping system |
| D. | pumping system |
| Answer» A. gravity system | |
| Explanation: the purified water in gravity system flow entirely under gravity. it is the most reliable and economical distribution system. | |
| 168. |
The pressure in the distribution mains does not depend on |
| A. | altitude to supply water |
| B. | fire fighting requirements |
| C. | availability of funds |
| D. | quality of water |
| Answer» D. quality of water | |
| Explanation: the pressure in the distribution mains depends on the height to which water is required to be supplied, fire fighting requirements, whether the supply is metered or not and availability of funds. | |
| 169. |
There is a 8 storey residential building in Lucknow. What is the pressure in the distribution mains? |
| A. | 2kg/cm2 |
| B. | 5kg/cm2 |
| C. | 7kg/cm2 |
| D. | 10kg/cm2 |
| Answer» B. 5kg/cm2 | |
| Explanation: when the height of residential building is between 6 to 10 storey, the pressure in the distribution mains lies between 4 to 5.5kg/cm2. | |
| 170. |
The velocity of water in a 10 cm diameter pipe should be |
| A. | 0.2m/sec |
| B. | 0.5m/sec |
| C. | 0.9m/sec |
| D. | 1.2m/sec |
| Answer» C. 0.9m/sec | |
| Explanation: the velocity of water in a 10 cm diameter pipe should be 0.9m/sec | |
| 171. |
In which system of water supply, water is available for 24 hours but uneconomically used? |
| A. | continuous supply |
| B. | fixed supply |
| C. | intermittent supply |
| D. | low supply |
| Answer» A. continuous supply | |
| Explanation: in continuous water supply, water is wasted due to a continuous supply of water for 24 hours of the day or long duration of flow. | |
| 172. |
In which system of water supply, water is supplied only during fixed hours of the day? |
| A. | continuous supply |
| B. | fixed supply |
| C. | intermittent supply |
| D. | low supply |
| Answer» C. intermittent supply | |
| Explanation: in intermittent supply, water is supplied to the consumer during fixed hours of the day and is adopted when sufficient pressure is not available or sufficient quantity of water is not available. | |
| 173. |
The velocity of water in the pipe is 1.8m/Sec. What is the diameter of pipe used? |
| A. | 10cm |
| B. | 15cm |
| C. | 25cm |
| D. | 40cm |
| Answer» D. 40cm | |
| Explanation: it is the maximum diameter of the pipe for which the velocity of water should not be less than 1.8m/sec. | |
| 174. |
The hourly demand rate is constant throughout the day. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: the hourly demand rate is not constant throughout the day, it is more during morning and evening and less during other parts of the day. | |
| 175. |
According the mass curve method, the storage capacity is defined as |
| A. | maximum excess of supply / maximum excess of demand |
| B. | maximum excess of supply * maximum excess of demand |
| C. | maximum excess of supply – maximum excess of demand |
| D. | maximum excess of supply + maximum excess of demand |
| Answer» D. maximum excess of supply + maximum excess of demand | |
| Explanation: a mass curve of demand is the cumulative demand curve, which is obtained by continuously adding the hourly demands and plotting it against time. | |
| 176. |
causes hoop tension in pipe shell. |
| A. | internal water pressure |
| B. | external water pressure |
| C. | water hammer |
| D. | longitudinal stress |
| Answer» A. internal water pressure | |
| Explanation: internal water pressure causes hoop tension in pipe shell and its magnitude is given by f = pd/2t where p is the internal pressure of water, d is the diameter of the pipe and t is the thickness of pipe shell. | |
| 177. |
The water supply pipes are buried underground. The load on the buried pipe due to earth filling is given by |
| A. | w = c*y*b |
| B. | w = c*y/b |
| C. | w = c*y*b2 |
| D. | w = c*y2*b |
| Answer» C. w = c*y*b2 | |
| Explanation: according to marston, the load w on buried pipes due to earth filling is given | |
| 178. |
Which of the following stress in pipe depends on temperature? |
| A. | internal water pressure |
| B. | stress due to foundation reaction |
| C. | longitudinal stress |
| D. | temperature stress |
| Answer» D. temperature stress | |
| Explanation: temperature stress is caused in pipes when they are laid above ground. when they are subjected to temperature variation, changes in the length of pipe takes place. | |
| 179. |
Pipe corrosion can be minimized by |
| A. | removal of copper sulfate |
| B. | addition of calcium carbonate |
| C. | addition of carbon dioxide |
| D. | removal of dissolved oxygen |
| Answer» D. removal of dissolved oxygen | |
| Explanation: pipe corrosion can be minimized by ph adjustment, control of calcium carbonate, removal of dissolved oxygen, removal of carbon dioxide and by the addition of sodium silicate. | |
| 180. |
How many types of pumps are present? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| Explanation: pumps are of two types. submersible pumps and open type pumps. submersible pumps require very less maintenance and are used inside water. both types can be used for traditional as well as hydro-pneumatic system. | |
| 181. |
Submersible pumps require high maintenance. |
| A. | true |
| B. | false |
| Answer» B. false | |
| Explanation: submersible pumps require very less maintenance and are used inside water. both types can be used for traditional as well as hydro-pneumatic system. | |
| 182. |
What is the minimum diameter of pipes used for drainage of waste water? |
| A. | 50 mm |
| B. | 75 mm |
| C. | 100 mm |
| D. | 105 mm |
| Answer» B. 75 mm | |
| Explanation: waste water is from showers, basins, kitchen sinks, washing machines and the like. this is also called grey water. | |
| 183. |
What is the wastewater from kitchen sinks called? |
| A. | grey water |
| B. | black water |
| C. | yellow water |
| D. | brown water |
| Answer» A. grey water | |
| Explanation: normally a minimum of 75 mm diameter pipes are used for drainage of waste water. waste water is from showers, basins, kitchen sinks, washing machines and the like. this is also called grey water. | |
| 184. |
What is the water from urinals called? |
| A. | black water |
| B. | yellow water |
| C. | grey water |
| D. | brown water |
| Answer» A. black water | |
| Explanation: soil water or sewage is from wcs and urinals. this is also called black water. minimum of 100 mm diameter pipes are used for waste water. these can be of cast iron or of pvc. | |
| 185. |
What is the minimum diameter of the pipe used to collect black water? |
| A. | 50 mm |
| B. | 75 mm |
| C. | 100 mm |
| D. | 125 mm |
| Answer» C. 100 mm | |
| Explanation: soil water or sewage is from wcs and urinals. this is also called black water. minimum of 100 mm diameter pipes are used for waste water. | |
| 186. |
What is the recommended slope ratio for soil water pipes? |
| A. | 1:12 |
| B. | 1:20 |
| C. | 1:30 |
| D. | 1:40 |
| Answer» D. 1:40 | |
| Explanation: soil water pipes should run at a steeper slope, such as 1:40, as they have solids. these can be of cast iron or of pvc. minimum of 100 mm diameter pipes are used for waste water. | |
| 187. |
Grease should not be allowed to enter the normal drainage system. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: a grease trap should be used when draining waste from kitchens, grease | |
| 188. |
is used to clean blockage in the line. |
| A. | lateral chamber |
| B. | main chamber |
| C. | inspection chamber |
| D. | sewer chamber |
| Answer» C. inspection chamber | |
| Explanation: tone ware (ceramic) pipes are used when soil and waste water is to be transported in external soil. an inspection chamber is used to clean blockage in the line and change direction of pipes. | |
| 189. |
What is the shape of the septic tank? |
| A. | square |
| B. | rectangle |
| C. | circular |
| D. | oval |
| Answer» B. rectangle | |
| Explanation: a septic tank is a rectangular underground tank with compartments. it is always full of sewage that can be removed manually. the less water put into a septic tank, the better it will function. | |
| 190. |
What is the percentage of purification of septic tank effluent? |
| A. | 30% |
| B. | 50% |
| C. | 70% |
| D. | 90% |
| Answer» C. 70% | |
| Explanation: the effluent that flows out of this, which is about 70% purified, is then put into a soak pit. a soak pit is a cylindrical tank with porous brick walls surrounded by a layer of gravel. | |
| 191. |
should not be placed near water body. |
| A. | power generator |
| B. | soak pit |
| C. | pump stations |
| D. | houses |
| Answer» B. soak pit | |
| Explanation: a soak pit should not be placed | |
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