250+ TOP MCQs on Water Conservation, Rainwater Harvesting, Watershed Management and Answers

Energy and Environment Management Multiple Choice Questions & Answers on “Water Conservation, Rainwater Harvesting, Watershed Management”.

1. What is called for the collection of rainwater for use?
a) Rain collection
b) Rainwater harvesting
c) Rain digging
d) Rain water pumping

Answer: b
Clarification: Rainwater harvesting is a technique of collection and storage of rainwater into natural reservoirs or tanks. Rainwater can be collected from rivers, roofs and in many places. The stored water can be used in needy situation.

2. What is the name of the process to clean water using filters?
a) Sublimation
b) Oxidation
c) Rainwater harvesting
d) Purification

Answer: d
Clarification: Purification of water is the process of removing undesirable chemicals, biological contaminants and gases from water. Water filter, the device uses small scale quality improvement clean the water for domestic purposes.

3. What is called for the method of removing dust and other particles from water using filters?
a) Filtration
b) Sublimation
c) Rainwater harvesting
d) Evaporation

Answer: a
Clarification: Filtration is a process that removes particles from suspension in water. Removal of particles takes place by a number of mechanisms that include straining, flocculation, surface capture and more types.

4. Which one of the following is the best way to conserve water?
a) Taking shower with less water
b) Taking shower with more water
c) Not taking shower
d) Using other liquids instead of water for shower

Answer: a
Clarification: Using less water in shower save water and it also saves time for shower. Various methods like installation of a low-flow showerhead, turning off the tap when not using, spending less time in shower can conserve water efficiently.

5. What is the gallon to use in new toilets according to Federal plumbing standards?
a) 1.6
b) 2.5
c) 3.9
d) 4.3

Answer: a
Clarification: Old toilets can use 3.5, 5, or even up to 7 gallons of water with every flush. Federal plumbing standards now specify that new toilets can only use up to 1.6 gallons per flush and high efficiency toilets that use up to 1.28 gallons.

6. We only use water for drinking.
a) True
b) False

Answer: b
Clarification: We don’t just use water for drinking. We use water for washing and we use water to produce everything from food to clothing. Fresh water supplies are being used faster than ever for crop production.

7. How many methods of rainwater harvesting are there?
a) One
b) Two
c) Three
d) Four

Answer: b
Clarification: There are two ways of harvesting rainwater, 1. Surface runoff harvesting: In urban area rainwater flows away as surface runoff, this runoff can be used for recharging aquifers. 2. Roof top rainwater harvesting: It is a system of catching rainwater where it falls.

8. How can we increase the water efficient irrigation system?
a) By pouring unnecessary water to the land
b) By not supplying adequate water
c) By applying drip irrigation method
d) By using more manures

Answer: c
Clarification: Drip irrigation is a method of controlled irrigation in which water is slowly delivered to the root system of multiple plants. Drip irrigation increases the water efficient irrigation system and hence it is very helpful in water conservation.

9. What are the two main types of drip irrigation?
a) Surface and Subsurface drip irrigation
b) Under and Subsurface drip irrigation
c) Top and Surface drip irrigation
d) Top and Under drip irrigation

Answer: a
Clarification: Surface drip irrigation and subsurface drip irrigation are the two main types of drip irrigation. In surface drip irrigation the water is delivered to the surface of the soil directly above the root system of the plants. In subsurface drip irrigation the water is applied directly to the root system.

10. Why should people implement rainwater harvesting?
a) In order to play with the water
b) In order to use during scarcity of water
c) In order to pour the rain water directly to the sewage
d) In order to time pass

Answer: b
Clarification: Rainwater harvesting helps to store the rain water and it can be used during the scarcity of water. We can use as per convince either directly or for recharging groundwater as the rain falling on the surface to flow away fast.

11. Which one of the following is the benefit of rainwater harvesting?
a) Flood mitigation
b) Provide a lot of water to play
c) Create good aesthetic view
d) Decrease the ground water level

Answer: a
Clarification: Rainwater harvesting helps for flood mitigation. Appropriate designed recharges in open public spaces will help to keep the roads from flooding. When water is not allowed to leave the premises there is less chance for choking up of the roads.

12. Which one of the following is an effective way of conserving water?
a) Increase food waste
b) Eat less meat
c) Always turn on the taps
d) Boil the water when there is no need

Answer: b
Clarification: Eat less meat is one of the effective ways of conserving water. Rearing animals for meat and dairy is incredibly water intensive. By cutting down on the amount of meat consume we can save water drastically.

13. What is called for an area surrounding a body of water in which that body of water is subject to?
a) Rainwater harvesting
b) Watershed
c) Water pumping
d) Water cycle

Answer: b
Clarification: Watersheds include groundwater flow as well slowly flows through deep soil. For example, if a river is flowing through a city, its watershed would be the surrounding land that is sloped towards the river including forests.

14. Rainwater harvesting increases the groundwater levels.
a) True
b) False

Answer: a
Clarification: Rainwater harvesting increases the ground water level, it marked the improvement of both the quantity as well as the quality of the groundwater in areas which have implemented rainwater harvesting.