All of the following are precautions which should be taken into consideration while measuring the mechanical equivalent of heat by electric method EXCEPT that the
Correct answer: D. thermometer should touch the base of the calorimeter.
- A. supply of voltage is steady.
- B. heating coil should be immersed in water.
- C. calorimeter should be placed in an insulation box.
- D. thermometer should touch the base of the calorimeter.
Explanation
D) Thermometer should touch the base of the calorimeter: This is not a precaution; in fact, it's something to avoid. For accurate temperature measurement of the water, the thermometer bulb should be immersed in the water but should not touch the heating coil or the base of the calorimeter. If the thermometer touches the base or the coil, it might measure their temperature instead of the water's, leading to inaccurate readings and errors in the experiment.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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