Q. During the compression of a spring the work done is 10 kJ and 2 kJ escaped to the surroundings as heat. The change in internal energy, ΔU (in kJ) is (Magnitude):
Q. Internal energy is an example of
- None of these
- Path function
- State function
- Both (a) and (b)
Q. Internal energy of an ideal gas depends on
- None of these
Q. The Internal Energy Change (ΔU) of a Process does not depends upon
Amount of substance undergoing the change.
Path of the process.
Nature of substance undergoing the change.
Q. Internal energy of a system increases, when the system
- absorbs heat
- does work
- loses heat
Q. A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy ΔU of the gas in joules will be:
- −500 J
- −505 J
- 1136.25 J
- +505 J
Q. Which of the following is incorrect regarding the internal energy of the system?
- It increases with increase in temperature
- It is a state function
- It can be calculated by experiment
- It remains unaffected with change in temperature
Q. The value of ΔH−ΔU for the following reaction at 37o C will be
- 51.54 J mol−1
- −51.54 J mol−1
- 51.54 kJ mol−1
- 5.154 kJ mol−1
Q. The internal energy of an ideal gas:
- increases with increase in temperature
- remains unaffected with temperature
- decreases with increase in temperature
- can be calculated by the reaction, E=mc2
Q. A gas sample is cooled and loses 65 J of heat. The gas contracts as it cools and work done on the system equal to 20 J. What are q, w and △U ?
- q=−65 J, w=20 J, △U=−45 J
- q=−70 J, w=10 J, △U=35 J
- q=65 J, w=10 J, △U=−35 J
- q=65 J, w=20 J, △U=45 J