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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?
विकल्प
(i)
(ii)
(iii)
(iv)
उत्तर
(iv)
Explanation:
Do not take shelter in a bus in the open.
As we know, buses are made of metals from the outside, so when lighting strikes the bus, it has no effect on the inside, and it doesn't matter what lighting does to the outside part of the bus, but for extra knowledge, the real reason is lighting is static electricity, which is different from the electricity in our homes, lighting has no effect on the inside of a hollow closed conductor but has an effect on the outside.
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संबंधित प्रश्न
Air around us exerts __________ .
The moving air is called _________ .
State whether the following statement is True or False:
Warm air is lighter than cool air.
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.
