To keep her soup warm Paheli wrapped the container in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.
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A patient in a hospital is given soup daily in a cylindrical bowl of diameter 7 cm. If the bowl is filled with soup to a height of 4 cm,
Here, r = 7/ 2 cm = 3.5 cm, h = 4 cm Capacity of 1 cylindrical bowl = π r2h = 22 7 × 3.5 × 3.5 × 4 cm3...
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Which of the following cannot be charged easily by friction? a. A plastic scale b. A copper rod c. An inflated balloon d. A woollen cloth
(a). A plastic scale
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A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted
(a) (iii); (b) (i); (c) (ii); (d) (iv)
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A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because
(b) air trapped between the layers of newspaper is a bad conductor of heat.
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Paheli and Boojho measured their body temperature. Paheli found her’s to be 98.6 °F and Boojho recorded 37°C. Which of the followng statement is true?
(c) Both have normal body temperature.
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Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel
No. The towel may burn due to the heat produced by the bulb. Besides, it will also result in wastage of electric energy.
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It was Paheli’s birthday. Her grandmother gave her two gifts made of metals,
The silver spoon on long exposure to moist air has lost its shine and appears dull whereas gold does not tarnish.
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It was Paheli’s birthday, her brother Simba was helping her to decorate the house for the birthday .
Activities (i), (iv), (v), (vi) and (vii) can be reversed and rest cannot be reversed.
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Paheli was writing a letter to her friend. She crumpled and threw the first draft of her letter on the floor as it had become untidy.
No. Use the paper for doing rough work or convert it into paper pulp to make a handicraft item.
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Fold a piece of cloth 3-4 times. Now bring it close to your mouth and blow hard on it. Did the cloth become warm?
Yes, the cloth has become warm.
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