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प्रश्न
Explain the following:
Water is heated generally from below.
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उत्तर १
Water is heated generally from below because water itself is a bad conductor of heat and the transfer of heat through convection take place vertically upwards
उत्तर २
Water is heated from below because water is heated by process of convection and in process of convection heat always flows in upward direction from downward direction.
संबंधित प्रश्न
Fill in the blank
The S.I. unit of temperature is ________.
Explain, why are the taps left dripping in sub-zero temperatures during winter?
Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.
The following figure shows a container in which a lighted candle has been kept. The container has two openings, p, and Q. Which way the smoke from an external source placed near P moves when it reaches P and leaves from Q. Give a reason for your answer.
Match the following
| 1. | Heat | 0o C |
| 2. | Temperature | 100o C |
| 3. | Thermal Equilibrium | kelvin |
| 4. | Ice cube | No heat flow |
| 5. | Boiling water | joule |
Temperature is the average ______ of the molecules of a substance.
Paheli and Boojho measured their body temperature. Paheli found her’s to be 98.6°F and Boojho recorded 37°C. Which of the following statement is true?
While a substance is undergoing a change of state, the temperature of the body remains the same.
Give reasons why –
we wear woolen clothes in winter
