Advertisements
Advertisements
Question
Explain the following observations very briefly
The arrow of weather cock points towards a particular direction at a particular moment.
Advertisements
Solution
A weather cock is an instrument which is used to indicate the direction in which air is moving. It consists of an arrow, mounted at its centre of gravity so it can move freely about a vertical axis.
APPEARS IN
RELATED QUESTIONS
How is greenhouse effect produced?
Fill in the blank:
_____________ discovered the oxygen gas.
What is air pollution?
Tick (√) the correct alternative from the choice given for the following statement.
Air consists of
Name the following.
Inert gases in the air
Complete the statement given below by filling in the blank with the correct word/s from the word/s given below
____________ is an example of a pollutant present in the air.
What is global warming?
Match the following:
| 1. | Layer of air | a. | Hand fan |
| 2. | Electrical energy | b. | 21% |
| 3. | Nitrogen | c. | Windmill |
| 4. | Oxygen | d. | Atmosphere |
| 5. | Palm Trees | e. | 78% |
Explain the following observations very briefly
A firki does not rotate in a closed area.
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
