Advertisements
Advertisements
Question
The jumbled word is given here. Write the correct form of each word.
CHARREGE
Solution
RECHARGE
APPEARS IN
RELATED QUESTIONS
Give reason On opening a bottle of a cold drink, a fizz sound is heard.
Give balanced chemical equation for the reaction of water with Sodium oxide.
Give reason of Alcohol is mixed with water and is used in car radiator.
The solubility of a gas in water.............. with rise in temperature and.......................with rise in pressure.
Give one word for the following statement:
A mixture of common salt and ice .
Answer the following question:
Why is acid added to water before electrolysis ?
How do fishes and aquatic animals survive when the pond gets covered with thick ice?
Explain why:
Air dissolved in water contains a higher proportion of oxygen.
Explain why:
Fused CaCl2 or conc. H2SO4 is used in a desiccator.
What do you understand by soft water?
Answer in your own words.
Why is there a shortage of water even though it occupies about 71% of the earth’s surface?
Fill in the blank:
Unpolluted water has _____ amount of dissolved oxygen.
Explain why oil spills have an adverse effect on marine life.
Select the correct word from the words in option to complete the sentence:
If pressure on the surface of water increases its boiling point ____ and freezing point ____.
Match the following
| 1. | Flood | Lake |
| 2. | Surface water | Evaporation |
| 3. | Sunlight | Water vapour |
| 4. | Cloud | Pole |
| 5. | Frozen water | Increased rainfall |
What is the source of water in each of the following?
Wells
The jumbled word is given here. Write the correct form of each word.
QUIFERA
Complete the following chart by writing appropriate words in the boxes marked (a) to (e).
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
In which of the following activities will you use minimum amount of water?
