This set of Civil Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Water Supply Works”.
1. Name the open drains provided for conveying water from kitchens, bathroom and rain water to main sewers.
a) drains
b) Sewers
c) Soak pit
d) Surface drains
View Answer
Explanation: These are usually provided at the side of the road and along the boundary line of the building. As far as possible drains should not be laid under the buildings. For efficient draining the surface drains should have certain qualities, such as should be laid in such a gradient to develop self -cleaning velocity, should have a reasonable free board at the top, joint should be smooth finished, easy curves, inner surface should be smooth, cheap in construction and maintenance.
2. The _______ are used for preventing foul gas from sewers to back flow in the house.
a) air freshners
b) traps
c) naphthalene balls
d) phenyl
View Answer
Explanation: In plumbing, a trap is a device which has a shape that uses a bending path to capture water to prevent sewer gases from entering buildings, while allowing waste to pass through. In refinery applications, traps are used to prevent hydrocarbons and other dangerous gases from escaping outside through drains.
3. Which type of trap is shown by the figure below?
a) S- trap
b) P- trap
c) Q-trap
d) R-trap
View Answer
Explanation: In domestic applications, traps are typically U, S, Q or J-shaped pipe located below or within a plumbing fixture. An S-shaped trap is also known as an S-bend. It was invented by Alexander Cummings in 1775 but became known as the U-bend following the introduction of the U-shaped trap by Thomas Crapper in 1880. The new U-bend could not jam, so, unlike the S-bend, it did not need an overflow. The most common of these traps in houses is referred to as a P-trap. It is the addition of a 90 degree fitting on the outlet side of a U-bend, thereby creating a P-like shape.
4. The figure below is a __________ of urinal.
a) squatting type
b) bowl type
c) slab type
d) trough type
View Answer
Explanation: Urinals are basically of three types- Bowl type, Slab or stall type and squatting type.
5. In office building what is the requirement of a water closet for 50 persons?
a) 4
b) 5
c) 2
d) 1
View Answer
Explanation: In office building the requirement of a water closet for 25 people or part thereof, 1 closet is required.
6. Number of urinals required in hostels for 25 persons.
a) 5
b) 1
c) 5
d) 10
View Answer
Explanation: In office building- 1 per persons, 2 per 21-45, 3 per 46-70 persons, 4 per 71-100. In cinema 1 for 25 persons or part thereof. In restaurant 1 per 50 seats.
7. For 1 wash Basin how many persons are allowed to use it at a time at office buildings?
a) 45
b) 35
c) 25
d) 15
View Answer
Explanation: In Cinema and theatres 1 for 200 persons or part thereof, in restaurant 1 for every water closet provision, in hostels 1 for 8 persons or part thereof.
8. In 2010, about __________ of the global population had access to piped water supply through house connections or to an improved water source through other means than house, including standpipes, water kiosks, spring supplies and protected wells.
a) 90%
b) 55%
c) 87%
d) 65%
View Answer
Explanation: In 2010, about 87% of the global population (5.9 billion people) had access to piped water supply through house connections or to an improved water source through other means than house, including standpipes, water kiosks, spring supplies and protected wells. However, about 13% (about 900 million people) did not have access to an improved water source and had to use unprotected wells or springs, canals, lakes or rivers for their water needs.
9. 90% of urban water supply and sanitation services are currently in the ______________
a) industry
b) agriculture
c) government
d) public sector
View Answer
Explanation: They are owned by the state or local authorities, or also by collectives or cooperatives. They run without an aim for profit but are based on the ethos of providing a common good considered to be of public interest. In most middle and low-income countries, these publicly owned and managed water providers can be inefficient as a result of political interference, leading to over-staffing and low labour productivity.
10. In _________________ system the source of supply is lake or impounding reservoir at some elevation.
a) parallel
b) gravity distribution
c) pumps distribution
d) rain distribution
View Answer
Explanation: This system is possible when the source of supply is lake or impounding reservoir at some elevation above the city so that sufficient pressure can be maintained in the mains.
11. The full cost of supplying water in urban areas in developed countries is about _________ per cubic meter depending on local costs and local water consumption levels.
a) US$6-7
b) US$10-12
c) US$1–2
d) US$11-12
View Answer
Explanation: The cost of sanitation (sewerage and wastewater treatment) is another US$1–2 per cubic meter. These costs are somewhat lower in developing countries. Throughout the world, only part of these costs is usually billed to consumers, the remainder being financed through direct or indirect subsidies from local, regional or national governments (see section on tariffs).
12. ________ traps are used for receiving waste water from kitchen sinks, baths and rain and surface water from house.
a) Gully
b) Floor
c) Intercepting
d) Reverse
View Answer
Explanation: At the top of the trap cast iron grating is provided to prevent entry of solid matters. The gully traps may be either of stone ware or caste iron.
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