1. The average quantity of water (in lpcd) required for domestic purposes according to IS code is ________
a) 100
b) 120
c) 70
d) 135
Explanation: The average domestic water demand in India is 135 litres per capita per day. For developed countries, average domestic water demand is around 340 lpcd because they live a luxurious life.
2. The average consumption of water required in factories in lpcd is ___________
a) 10-15
b) 20-30
c) 30-45
d) 70-80
Explanation: The average water consumption in factories is 30lpcd when no bathrooms are required and 45lpcd when bathrooms are required.
3. In which type of water demand, minimum average consumption of water takes place?
a) Domestic water demand
b) Industrial water demand
c) Institutional and commercial water demand
d) Fire demand
Explanation: The minimum average water consumption takes place in fire demand. It accounts to 1lpcd which is very less but this water is required in very less duration.
4. What is the minimum water pressure available at fire hydrants?
a) 80-100kN/m²
b) 100-150kN/m²
c) 40-60kN/m²
d) 150-200kN/m²
Explanation: The minimum water pressure available at fire hydrants is 100-150kN/m2 i.e 10-15m of water head and it should be maintained for 4 to 5 hours.
5. What is the fire demand of the city of 1lakh population by Buston’s formula?
a) 5663
b) 56630
c) 566300
d) 5663000
Explanation: By Buston’s formula, Q = 5663√P where P in thousands. Here, P =100, Q = 5663√100 => Q = 56630
6. Water lost in theft and waste contributes to how much % of total consumption?
a) 5
b) 10
c) 15
d) 20
Explanation: Water loss in thefts and wastes contributes to 15% of total consumption, which includes the water loss due to leakage or stolen due to illegal connection
7. Which is the correct statement regarding per capita demand?
a) Daily water required by an individual
b) Water required for various purposes by a person
c) Water required by an individual in a year
d) Annual average amount of daily water required by one person
Explanation: The per capita demand is the annual average amount of daily water required by one person. It is denoted by q in litres per day per person.
8. What are the factors affecting per capita demand?
a) Size of city
b) Size of city, habit of people
c) Cost of water, quality of water, size of city
d) Cost of water, quality of water, size of city, habit of people
Explanation: Increase in cost of water, quality of water and size of the city will result in more consumption of water. Poor habits of people in the utilization of water will also cause greater consumption.
9. Which of the following statement is correct?
a) Rich class consumes less water
b) Intermittent water supplies leads to less water consumption
c) Loss of water is more if the pressure in the distribution system is less
d) Water consumption is less in flush system
Explanation: Rich class consumes more water, loss of water is more if the pressure in distribution system is more, water consumption is more in flush system and b option is the only correct statement.
10. If the annual average hourly demand of the city is 10000m3, what is the maximum hourly consumption?
a) 2700 m3
b) 27000 m3
c) 270000 m3
d) 2700000 m3
Explanation: Maximum hourly demand = 2.7 * annual average hourly demand
= 2.7 * 10000
= 27000m3.