Advertisements
Advertisements
प्रश्न
Open drain system is a breeding place for which of the following?
विकल्प
Flies
Mosquitoes
Organisms which cause diseases
All of these
Advertisements
उत्तर
All of these
Explanation:
In some places, there are open drains to dispose off the sewage. These drains can easily get blocked by plastic bags and can overflow. Therefore, the problems of smell, breeding of mosquitoes, flies and germs are encountered in open drains.
APPEARS IN
संबंधित प्रश्न
Give balanced chemical equation for the reaction of water with Sodium .
Give balanced chemical equation for the reaction of water with Iron .
Give balanced chemical equation for the reaction of water with Sodium oxide.
The solubility of a gas in water.............. with rise in temperature and.......................with rise in pressure.
Match the statements in column A with that in column B.
| Column A | Column B |
| (a) deliquescent substance | (1) sodium bicarbonate |
| (b) hygroscopic substance | (2) magnesium chloride |
| (c) efflorestance substance | (3) conc. sulphuric acid |
| (d) substance causing temporary hardness | (4) washing soda |
Explain how the peculiar variation of density of water with temperature can protect marine-life.
State whether the given statement are true or false. If true, write the reason.
Ganga−Brahmaputra plain of India is an overpopulated region.
How is aquatic life benefited by the fact that water has maximum density at 4oC?
Identify A, B, C and D; first one is done for you.
Explain why rivers and lakes do not freeze easily.
Explain why:
If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.
Explain why:
Water is an excellent liquid to use in cooling systems.
Complete the statement by filling the blank with the correct word from the option.
Kerosene & water form a _______ mixture.
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 |
What happens when a spoonful of sugar, sawdust, and soil are added to a glass of water?
If, at some place, it did not rain for a very long period of time, what would be its effect on the life of the people there?
Match the following
| 1. | Flood | Lake |
| 2. | Surface water | Evaporation |
| 3. | Sunlight | Water vapour |
| 4. | Cloud | Pole |
| 5. | Frozen water | Increased rainfall |
“Every Drop Counts” is a slogan related to
Complete the following chart by writing appropriate words in the boxes marked (a) to (e).
Which of the following is waste water?
