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प्रश्न
Why do people prefer wearing white clothes during summer?
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उत्तर
People prefer white or light coloured clothes during summer as they are good reflectors of heat and hence, they keep us cool.
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संबंधित प्रश्न
What is meant by the term temperature.
Write down the temperature of the lower fixed point on the Fahrenheit scale.
Write down the body temperature of a healthy person.
Explain the construction of a calorimeter. Draw the necessary figure.
Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.
State the volume changes that you will observe when a given mass of water is heated from 0°C to 10°C. Sketch a temperature-volume graph to show the behaviour.
1 J equals to :
What is the principle of calorimetry?
Do all substances expand on heating? Give examples.
Is conduction possible in gases?
Why is a newly made quit warmer than an old one?
Name three devices which are used to detect heat radiations.
State the advantages and disadvantages of mercury and alcohol as thermometric liquids.
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.
Analogy
Ice cube : 0o C :: Boiling water :______
Thermal energy always flows from a system at higher temperature to a system at lower temperature.
If you keep ice at 0° C and water at 0° C in either of your hands, in which hand you will feel more chillness? Why?
The coldest temperature in the world was measured in the ______ continent.
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?
