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प्रश्न
In a filtration, plant water is filtered using layers of
पर्याय
sand and clay
clay and fine gravel
sand and fine gravel
sand, fine gravel and medium gravel
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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.
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संबंधित प्रश्न
Why is water very precious for all living being ?
Water has ...................... density and .................. volume at 4°C.
The solubility of a gas in water.............. with rise in temperature and.......................with rise in pressure.
Answer the following question:
Name two gases dissolved in natural water.
Which property of water enables it to modify the climate?
Explain why rivers and lakes do not freeze easily.
What is the importance of dissolved impurities in water?
Compare the effect of soaps and detergents on hard water.
Select the correct answer of the following statement:
A decahydrate crystal.
Select the correct answer of the following statement:
A drying agent placed in desiccator.
Give a balanced equation for the following conversion:
Calcium sulphate in permanent hard water to calcium carbonate using sodium carbonate.
Complete the statement by filling the blank with the correct word from the option.
The ratio of hydrogen & oxygen in water is ____.
Fill in the blank:
The type of water softened by addition of washing soda is ______.
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 |
Suggest some ideas to save rainwater in your school.
_____ is a type of rainwater harvesting.
Water changes to ice at ______.
Mountains helps to regulate the temperature of our earth.
How is the life of organisms living in water affected when water gets polluted?
Think and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.
