Distinguish clearly between heat and temperature.
Distinguish clearly between heat and temperature.
Ans: –The heat and temperature of the different object are mentioned by different way. The heat is determined by the thermal energy but temperature is determined by the molecular kinetic energy.
During change of state: (i) Is there a rise in temperature of the material on heating it? and (ii)What happens to the heat we supply?
Ans: – Yes there will be rise in temperature of the material on heating. As when the state is changes to the other state the molecules in it will have more kinetic energy as compared to previous.
Name the factors on which the thermal expansion of a wire depends.
Ans: – The thermal expansion of wire is dependent on the various factor like-
- The area of the wire.
- The length of the wire.
- Surrounding temperature.
- Material of the wire.
Give any two uses of a bimetallic strip.
Ans: – There are two different elements in a bimetallic strip. This bimetallic strip isused in the displacement changes by mechanical stretch.These two elements have different temperature.
If you have an uncalibrated mercury thermometer how will you calibrate it into a
(a) Celsius thermometer (b) Fahrenheit thermometer.
Ans: – There present a bulb in the thermometer which get equilibrium at standard temperature when it kept in the water or ice try to make in equilibrium. There is a difference between the Celsius and Fahrenheit thermometer as Fahrenheit thermometer is more superior.
Explain the following:
(i) Why is mercury used as a thermometric liquid?
(ii) Why does a bimetallic strip bend on heating?
(iii) Why does steam at 100°C gives more severe burns than water at100°C?
(iv) Why do we use ice for cooling our drinks and not water at 0°C.?
Ans: – (i)The element which is used in thermometer is mercury as this have some specific quality like it quickly heated up and get down and don’t stick in the wall.
(ii)There are two different elements in bimetallic strip and both have different temperature.
(iii) Because of the latent heat at 100℃ of steam is more than the water so this is more severe than the water at 100℃.
(iv)As the specific heat of ice ore than the other so this is used.
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