Heat energy flows
One glass of water at 40ºC is mixed with another glass of water at 60ºC. The temperature of mixture will be:
The degree of hotness or coldness of a body is measured by its
Mercury is an ideal liquid used in a thermometer because
At low temperatures ______ type of thermometers is used
Alcohol has a freezing point much lower than other given substances here.
1 cal is equal to
1 cal = 4.18 joules.
The CGS unit for energy is
When we touch a steel rod and a paper simultaneously, we feel that the rod is colder because
Heat always flows from a hotter region to a colder region. Since iron is a good conductor of heat, more heat will flow from our body to it and we will feel cold. As paper is a bad conductor, less heat will flow from our body.
The lower fixed point on the Celsius scale is
The lower fixed point in the Celsius scale is 0ºC, which is the melting point of ice.
In the Celsius scale, the upper fixed point is
The upper fixed point in the Celsius scale is 100ºC, which is the boiling point of water.
In which of the following, chemical energy is converted into heat energy.
The chemicals present in the candle burn with oxygen to give out heat.
Handles of cooking utensils should be made of materials that:
Which of the following is a good conductor of heat?
Metals are better conductors of heat than non-metals.
Which of the following is a bad conductor of heat?
Wood is a non-metal and bad conductor of heat.
Radiation depends on