Question 10

Paheli had brought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this

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Solution

She can easily open the bottle because of expansion of metal cap (increase in size) due to heating. When a metal object is heated, it increases in size and when the hot metal object is cooled, it decreases in size and comes back to the original size.

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Q. Paheli had brought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for five minutes. She could easily open the bottle now. Can you give the reason for this?

Q. A girl tried the new bottle of pickle with metal cap but could not do so then she took a bowl of hot water and immersed the upper end of the bottle in it for 5 minutes. she could open the bottle easily now what is the reason?

Question 17

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Q. 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

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Question 19.2

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
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