Advertisements
Advertisements
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
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
What is the major source of fresh water in the city/town/village where you live?
Why is water essential for life?
The ultimate source of all water on the earth is
Give any three important uses of water.
Give balanced chemical equations to show the reaction between Magnesium and water.
Compare the effect of soaps and detergents on hard water.
Why is it said that seawater is useful even though it is not potable?
Give the importance of dissolved air – in water.
Give reason for the following:
The percentage of oxygen, in air dissolved in water, is higher than the percentage of oxygen in ordinary air.
Give a reason for the following:
Efflorescence is minimum during humid conditions.
Give a reason for the following:
A crusty ‘boiler scale’ is formed in boilers, when hard water is used.
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 |
________ of water is in oceans and seas.
Condensation results in the formation of dew on grass.
From where do the following usually get water? In which form is water present in them?
Aquifer
From where do the following usually get water? In which form is water present in them?
Animals
Water in our tap comes from a ______.
Fill in the blanks selecting words from the following list
snow, rain, clouds, vapour, evaporation, transpiration.
Water, as ______ goes into atmosphere by the processes of ______ and ______ and forms ______, which on condensation fall in the form of ______ and ______.
Construct a crossword puzzle of your own using the keywords.
