Double-layered paper cups keep coffee hot for a longer time than single layered cups. Will the double-layered cups also keep ice cream shakes cold for a longer time? Explain your answer.

Double-layered paper cups keep coffee hot for a longer time than single-layered cups. We know heat flows from a hot body to a cold body. When hot coffee is poured into the cup, the liquid inside the cup is at a higher temperature than the cup. Hence, the heat flows from the liquid to cup. Now, the double-layered cups have air trapped in between the walls and the air is a bad conductor of heat. Hence, the rate of transfer of heat from the cup reduces thereby the coffee remains hot for a longer time. Similarly, when we take a cold beverage in the cup, the flow of heat from outside into the cup is also reduced due to the presence of air. Hence, the double-layered cups will also keep ice cream shakes cold for a longer time.

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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 3

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Which process causes the air above the hot tea to get heated?

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Important Questions on Heat

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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 6

Double-layered paper cups keep coffee hot for a longer time than single layered cups.

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Will the double-layered cups also keep ice cream shakes cold for a longer time? Explain your answer.

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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 7

Boojho has three thermometers as shown in the figure. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?
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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 8

Observe the picture given below. Water is being boiled in a pan of wide base.

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The box $P$ indicates ______ mode of heat transfer

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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 9

Which of the following could be placed in a glass tumbler before pouring hot milk into it to reduce the chances of the tumbler cracking due to the heat?

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Science Textbook of Competency Based Questions for Class VII>Chapter 4 - Heat>Exercise>Q 10

A wet cloth was placed on a balance and left for several days. The change in its mass is shown in the graph below: What was the mass of water in the cloth at the start of the experiment?