Advertisements
Advertisements
Question
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?
Advertisements
Solution
I see the water turns into vapour and bubbles are formed.
APPEARS IN
RELATED QUESTIONS
Name the gas produced when steam is passed over hot coke.
Give reason of Carbonated drinks are bottled under high pressure.
Explain how the peculiar variation of density of water with temperature can cause water— pipes to burst in very cold places.
Define
Henry's law
Fill in the blank:
Unpolluted water has _____ amount of dissolved oxygen.
Water is the most ________ resource on the Earth.
In the coastal areas, wind current moves from the sea towards the land during the day; but during the night it moves from land to the sea. Discuss the reason.
On which of the following day is World Water Day observed?
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 |
Write any two activities which require more than a bucket of water.
