Thermodynamics
20 Questions
1.
2.
The first law of thermodynamics states that the change in the internal energy of a system is
equal to the difference in energy transferred to or from the system as heat and
force
mass
pressure
work done
Which best describes ENTROPY?
Heat that can be stored to be used at a
later date
A state of order in a physical system
Random energy that escapes from the
system
Useful heat energy needed to drive an
engine
3.
Which state of H2O has the greatest entropy?
Ice
Water
Vapor
4.
Transfer of heat in a gas or liquid by the motion of particles in the heated fluid
conduction
convection
radiation
5.
1200 J of heat are added to a sample of gas while the gas does 400 J of work on the
environment. What is the change in internal energy of the gas?
-1600 J
800 J
-800 J
1600 J
6.
During process A, from state 1 to state 2, the temperature of the
ideal gas
decreases
stays the same
is half as much
increases
7.
During an adiabatic process, a sample of gas does 400 J of work on the environment. What
change occurs with the internal energy of the gas?
The internal energy increases by 400 J.
The internal energy decreases by 400 J.
The internal energy doesn't change.
There is not enough information if we
don't know how much heat was added or
removed.
8.
9.
Process B on the PV diagram is an ____________ process.
isothermal
isobaric
isochoric
adiabatic
A system comprising a single phase is called a
(e) heterogeneous system.
(d) homogeneous system
(c) isolated system
(b) open system
(a) closed system
10.
11.
12.
In an irreversible process, there is a
(a) loss of heat
(b) no loss of heat
(c) gain of heat
(d) no gain of heat.
The heating and expanding of a gas is called
(b) thermodynamic cycle
(c) thermodynamic process
(a) thermodynamic system
(d) thermodynamic law.
The value of one bar (in SI units) is equal to
(a) 100 N/m2
(d) 1 × 105 N/m2
(c) 1 × 104 N/m2
(b) 1000 N/m2
(e) 1 × 106 N/m2.
13.
In an extensive property of a thermodynamic system
(d) all of the above
(e) none of the above.
(c) extensive energy is utilised
(b) extensive work is done
(a) extensive heat is transferred
14.
15.
16.
17.
18.
19.
20.
Which of the following is an intensive property of a thermodynamic system ?
(b) Temperature
(d) Energy.
(a) Volume
(c) Mass
When two bodies are in thermal equilibrium with a third body they are also in thermal
equilibrium with
each other. This statement is called
(b) First law of thermodynamics
(a) Zeroth law of thermodyamics
(d) Kelvin Planck’s law.
(c) Second law of thermodynamics
2.Internal energy depends on
Only Volume
Only Mass
Only pressure
Only Temperature
3. 1st Law of thermodynamics is the conservation of
Electric energy
Heat energy
Radiation energy
Magnetic energy
6. Area under P-V diagram gives
Temperature
Internal energy
Heat
Work done
7. Which of the following process is used to do maximum work done on the ideal gas if the
gas is compressed to half of its initial volume?
Isothermal
Isochoric
Adiabatic
Isobaric
10. 1 Calorie is equal to
3.6 J
5.2J
4.2 J
3.2 J
Answer Key
1.d
2.c
3.c
4.b
5.b
6.d
7.b
8.c
9.b
10.a
11.a
12.b
13.b
14.a
15.b
16.d
17.b
18.d
19.c
20.c