Advertisements
Advertisements
प्रश्न
In a filtration, plant water is filtered using layers of
विकल्प
sand and clay
clay and fine gravel
sand and fine gravel
sand, fine gravel and medium gravel
Advertisements
उत्तर
sand, fine gravel and medium gravel
Explanation:
In wastewater treatment, wastewater is allowed to enter a grit and sand removal tank. Here, the speed of wastewater is reduced in order to allow sand, grit and pebbles to settle down.
APPEARS IN
संबंधित प्रश्न
Give reason for Silica gel pouches are kept in unused water bottle.
The solubility of a gas in water.............. with rise in temperature and.......................with rise in pressure.
Give any three important uses of water.
What causes the violence associated with torrential rain?
What is the effect of impurities present in the water on the melting point and boiling point of water?
Explain why:
Water is an excellent liquid to use in cooling systems.
Give a balanced equation for the following conversion:
Sulphur dioxide to sulphurous acid using a neutral liquid.
State the importance of water for all general uses.
Select the correct word from the words in option to complete the sentence:
Dissolved air in water contains a ____ percentage of oxygen than ordinary air.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
Pour water from the ice tray into a kettle. Ask an elder at your home to heat the kettle and observe the mouth of the kettle when the water starts boiling.
What do you see?
Suggest some ideas to save rainwater in your school.
_____ is a type of rainwater harvesting.
Write a few slogans of your own on the topic “Save Water”
Nitrogen is used for the treatment of drinking water.
Among the given options, which one is not correct for the use of large amounts of fertilisers and pesticides?
Rivers from land, add minerals to seawater. Discuss how?
What is the source of water in the following?
Wells
State whether the following statement is True or False. If false, give the correct statement.
Snow and ice both are solid forms of water
A man travelling on a train threw an empty packet of food on the platform. Do you think this is a proper waste disposal method? Elaborate.
