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प्रश्न
Who am I?
I make things hot or cold.
उत्तर
I make things hot or cold- Temperature
संबंधित प्रश्न
State the temperature of ice point on the Celsius scale.
Draw a neat labelled diagram of a laboratory thermometer.
Convert 5°F to the Celsius scale.
Explain the following
In winter, water tanks (or ocean) start freezing from the surface and not from the bottom.
A body radiates out 300 calories of heat energy. How much heat energy is radiated out by the body in joules?
Two bodies are at same temperature. Do they necessarily contain same amount of heat?
Do all substances expand on heating? Give examples.
What is evaporation? Why does it cause cooling?
What do you mean by linear expansion?
What is a bimetallic strip?
Convert the following temperature into Celsius scale:
104oF
Draw a neat and labeled diagram of a Six's maximum and minimum thermometer. Explain briefly, the working of this thermometer. Give a use of this thermometer.
Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.
Explain the following:
In a solid, heat is not transferred by the process of convection.
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
Thermal energy always flows from a system at higher temperature to a system at lower temperature.
Heat energy flows from a body at a low temperature to a body at a higher temperature.
Give reasons why –
an igloo is built as a winter shelter
Give reasons why –
we wear woolen clothes in winter
Which factor determines the direction of flow of heat from one body to another?
