Tag: chemistry

Questions Related to chemistry

Why it is very important that water is used carefully?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. To avoid shortage of water.

  2. To save cost as water is expensive.

  3. Excess usage of water is not ethical.

  4. All of the above.

Show answer
Correct Option: A
Explanation:

There is shortage of water in many parts of the world. Hence, it is very important that water is used carefully to avoid shortage of water.

What is rainwater harvesting?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. collecting, storing and distributing rainwater

  2. seeding in clouds

  3. distribution of stored water

  4. water supply

Show answer
Correct Option: A
Explanation:

Rainwater harvesting is the process of collection of rainwater from surfaces on which rain falls, filtering it and storing it for multiple uses  'OR' the method of collecting, storing and distributing rainwater for different uses. 

The collected water can be stored for direct use or it can be diverted for groundwater recharge.

Which of the following is true about Rooftop rainwater harvesting?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. The rainwater is collected from the rooftop to a storage tank, through pipes.

  2. This water may contain soil from the roof and need filtering before it is used.

  3. Instead of collecting rainwater in the tank, the pipes can go directly into a pit in the ground.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Following are true about Rooftop rainwater harvesting:
1) The rainwater is collected from the rooftop to a storage tank, through pipes.
2) This water may contain soil from the roof and need filtering before it is used.
3) Instead of collecting rainwater in the tank, the pipes can go directly into a pit in the ground.

When rainwater percolates into the cracks of RCC, it further gets weakened due to the:

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. formation of $H _2CO _3$

  2. increase in pH value

  3. increase in the percentage of free lime

  4. exothermic hydration process

Show answer
Correct Option: A
Explanation:

Formation of $H _{2}CO _{3}$:

RCC contains $CaCO _{3}$ which when reacted with water forms carbonic acid which therefore gets weakened.
$CaCO _{3} + H _{2}O \rightarrow CaO + H _{2}CO _{3}$

Hence, the co0rrect option is $(A)$.

Which of the following situations is classified as suffering from water scarcity?
(a) Region with high annual rainfall.
(b) Region having high annual rainfall and large population.
(c) Region having high annual rainfall but water is highly polluted.
(d) Region having low rainfall and low population. 

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. a and b

  2. a and d

  3. c and d

  4. b and c

Show answer
Correct Option: D
Explanation:

Region having high annual rainfall and large population and  Region having high annual rainfall but water is highly polluted regions have high water scarcity problem because of high use of water tends to water pollution.Polluted water is unusable for humans.

Where can rain water harvesting not be practised?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. Playground

  2. Rooftops

  3. Bathroom

  4. Can be used in all of the above

Show answer
Correct Option: C
Explanation:

Rainwater harvesting cannot be practiced in Bathroom as the bathroom is a closed area and the rain water cannot directly comes into it.

As all other are open area where rain water directly falls so there we can practice rainwater harvesting

Where can Rain Water Harvesting be implemented?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. Homes

  2. Schools

  3. Any other space as long as there is a catchment area

  4. All of these

Show answer
Correct Option: C
Explanation:

Rainwater harvesting can be implanted in an open area where the rain falls directly.

so it  can be implanted in any space as long as there is a catchment area.
As it cannot be implanted in closed area so it cannot be implanted in homes and schools. 

Which of the following increase the rate of percolation of rain water into the soil?

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. Constructing check dams

  2. Vegetation and trees

  3. Overgrazing

  4. All of the above

Show answer
Correct Option: A

Rain water harvesting is a method employed to:

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. stop soil erosion

  2. raise the water table 

  3. increase afforestation 

  4. decrease floods and droughts 

Show answer
Correct Option: B
Explanation:

Rainwater harvesting is the accumulation and storage of rainwater for reuse on-site, rather than allowing it to run off. All the water was collected into a well and helps in raising water table.

"Catch it where it falls" is the basic idea behind :

chemistry water: a natural resource water resources and conservation receding water table water conservation and irrigation

  1. making dams to store water

  2. recycling of water

  3. rain water harvesting

  4. condensation of water vapour

Show answer
Correct Option: C
Explanation:

'Catch it where it falls'  is the basic idea behind the rain water harvesting. Rain water harvesting is the accumulation and storage of rain water for reuse on site rather than allowing it to run off.