Question
Heat supplied to a system is measured in _____.
This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
joules
Heat Measurement Unit
Heat is a form of energy transfer. The standard unit for measuring energy, including heat, in the International System of Units (SI) is the joule.
- Joules (J): This is the SI unit for energy and heat. When heat is supplied to a system, the amount is quantified in joules.
- Kilowatts (kW): This is a unit of power, which is the rate at which energy is transferred or work is done (1 kW = 1000 Joules per second). It measures power, not the total amount of heat energy.
- Amperes (A): This is the SI unit for electric current, measuring the flow of electric charge. It is unrelated to heat measurement.
- Degrees Kelvin (K): This is the SI unit for thermodynamic temperature. Temperature indicates the hotness or coldness of a system, not the amount of heat energy supplied.
Therefore, heat supplied to a system is measured in joules.
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Important Questions from Heat, internal energy and work
Internal energy associated with kinetic energy of molecules is ______.
Assertion (A): The heat and work transfer cannot be expressed as difference between the end states.
Reason (R): Heat and work are both exact differentials.
2 kg of liquid having specific heat of 3 kJ/kg-K is stirred in a well-insulated chamber causing temperature rise by 15°C. What will be the amount of work done on the liquid (or system)?
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