Work done on a system (like compressing gas) increases its internal energy. Increased internal energy in a gas manifests as increased temperature and thus increased average kinetic energy of the molecules.
According to the principle of energy conservation, when a piston in an automobile engine compresses the gas in a cylinder, which of the following must occur ?
Asked in UPSC CAPF 2014 · Topic: Heat and Thermodynamics (Zeroth and First Laws of Thermodynamics (Internal Energy, Work, Heat, Enthalpy))
Show answer
Answer: A. Kinetic energy of gas must increase
More Physics questions
- A Kelvin thermometer and a Fahrenheit thermometer both give the same reading for a certain sample. The corresponding Celsius temperature is about
- The temperature of a body decreases from 240 K to 210 K. The corresponding change (without sign) in the temperature in degree Fahrenheit is close to :
- At what temperature, Celcius and Fahrenheit readings will be same?
- Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy.
- In a Rankine cycle, water is pumped from 10 kPa to 2 MPa. Assuming water to be incompressible, the specific work (in kJ/kg) supplied to the pump is given by (Assume water density = 1000 kg/m³) - If the question has multiple statements, format using ... - For Assertion/Reason, retain 'Statement-I' and 'Statement-II' clearly. - For matching pairs, use HTML
- The power developed by a turbine in a certain steam power plant is 1206 kW. The heat supplied to boiler is 3500 kJ/kg. The heat rejected by steam to cooling water is 2900 kJ/kg. The feed pump work required to condense condensate back into the boiler is 6 kW. What will be mass flow rate of cycle ? (1) 2 kg/s (2) 0.002 kg/s (3) 6.22 kg/s (4) 0.00622 kg/s (5) Question not attempted
- When steam is converted into water, internal energy of the system
- Consider the following statements: Statement-I : If a system is subject to a cyclic process, the net heat absorbed by the system is equal to the net work done by the system. Statement-II : If a system is subject to a cyclic process, the change in internal energy of the system is zero. - Which of the statements given above is/are correct?