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प्रश्न
State whether the following statement is True or False:
Warm air is lighter than cool air.
पर्याय
True
False
उत्तर
True
APPEARS IN
संबंधित प्रश्न
Following are precautions one must take in case a storm is accompanied by lightning.
(i) Do not take shelter under a tree.
(ii) Do not take shelter under an umbrella with a metallic end.
(iii) Do not take shelter in open garages, storage sheds, etc.
(iv) Do not take shelter in a bus in the open.
Which one of these is not correct?
Air around us exerts __________ .
The moving air is called _________ .
To expel hot air out of the kitchen, ‘A’ has an exhaust fan fitted on the window of her kitchen and ‘B’ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why?
Match Column I with Column II. There can be more than one match.
| Column I | Column II | ||
| (a) | on heating air | (i) | descends |
| (b) | on cooling air | (ii) | expands |
| (iii) | contracts | ||
| (iv) | rises | ||
Describe an activity to demonstrate that warm air is lighter than cool air
The picture in Figure 8.4 shows a tree line along the sea coast on an island near the equator. As shown, the treetops are permanently bent in one direction. Are the trees bent towards the sea or away from it? Explain.
