- Section 1
31. |
Suitable impurities are added to a semiconductor depending on its use. This is done in order to |
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33. |
It takes much longer to cook food in the hills than in the plains, because |
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34. |
Inside an aeroplane, flying at a high altitude, |
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35. |
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media? |
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