Answers are given after 10 Mcqs.
1) Two bodies are said to in thermal
equilibrium if they have the same ____________________.
a)
Temperature b) Amount of heat c) specific heat d) Thermal capacities
2) In any process the maximum amount of
mechanical energy that can be ________________.
a) converted to heat b)
Depends upon the amount of friction c)
depends upon the intake and exhaust temperature d)In
an isothermal change, internal energy
3) In an isothermal change, internal energy ____________________.
a) Decreases b) increases c) becomes zero d) remains constant
4) A thermos bottle containing hot coffee is vigorously shaken. Consider
coffee as the system, then its temperature ______________________.
a)
Increases
b) Decreases below than 0oC
(c) remains the same
d) decreases
5) Maximum work can be obtained in the process called
______________________________.
a) cyclic b) isothermal c) adiabatic d) isochoric
6) Two ideal heat engines A and B have their sources at 600K and 400K
and their sinks at 300k and 250K respectively. What can you say about their
efficiency?
a)
A is more than B b) A is less than B c) Both are equal efficient d) The data given is sufficient
7) If the temperature of the heat source
is increased, the efficiency of a Carnot’s engine_____.
a)
increases b) decreases c)remain constant d)
first increases and then becomes
constant
8) Triple point of water is ________________________.
a) 273.16o
C b) 372.16 K c) 273.16o d) 273.16K
9) A real gas can be approximated to an
ideal gas at
a) low
density b) high
pressure c) high density d) low temperature
10 ) If the volume of the gas is to be
increased by 4 times, then
a)
Temperature and pressure must be double
b)
At constant P and temperature must be increased
by four times
c)
At constant T the pressure must be increased by
four times
d)
It cannot be increased
Answers
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1.a 2.b 3.d
4.a 5. B 6.a 7.a 8.d 9.a 10.b
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23. unit of entropy is
24. The graph between V and 1/p at constant temperature is
25. Which one is not adiabatic process?
26. Because of _________________________is not zero, so Efficiency of Carnot will not null or zero.
27. Which of these remains constant in isobaric process?
28. The absolute zero is the temperature at which:
29. The efficiency of the heat engine is ________________________________.
30. The efficiency of the heat engine is ________________________________.
11. In
which process all the heat supplied is converted into work done?
(a) Isothermal b)isochoric c )isobaric d) adiabatic
12. The
work done in isochoric process is _________________________________.
a) constant b) variable c) zero
d) depends on situation
13. The
value of ϒ for diatomic gas is _______________________________.
a) 1.67 b)1.4
c)1.2 d) 1.7
14. Which quantity
is a state function?
a) internal energy
b) heat supply c)
pressure d) volume e) temperature
15. Adiabatic
process is also called__________________________.
a) Heat exchange process
b) no Heat exchange process c) isentropic process d) both b
& c
16. In
which process entropy remains constant ?
a) isobaric
b) adiabatic c)
isochoric d) isothermal
17. For all
gases, which of the following properties of molecules of a gas is same at specific
temperature/s?
a) momentum b) velocity c)
kinetic energy d) mass
18. Boyles
law in ideal gases exist in ___________________________.
a) adiabatic process b)
isobaric process c)isochoric process d)isothermal
process
19.Standard
temperature pressure of gas means _________________________.
a) 760mm 273K b) 1
atm 273k c)76cm
0oC d)
both b & c
20. Which
one is true for internal energy?
a) It is the state fuction of a system b) it is sum of k.E and P.E
c)it is proportional to translational K.E of the molecules d) both b& c
Answers
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11.a 12. C
13. b 14. A 15. d 16.c
17.c 18. d 19.d 20.d
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21. Heat can
be produce by
a. frictional
process b. chemical process c.
electrical process d.
all of these
22. One degree
of Celsius equals to ______________________
a. 1 degree of Fahrenheit scale b. 1.8 degree of Fahrenheit scale c.
3.2 degree of Farenheit scale d. 2.12 degrees of Fahrenheit scale
23. unit of entropy is
a. JK b. JK-1 c.
J-2K d. J-1K
24. The graph between V and 1/p at constant temperature is
a. Parabola b. a
curve of various shape c. a straight line d.hyperbola
25. Which one is not adiabatic process?
a. travelling of sound waves b. bomb explosion c.
cloud formation d. rapid escape of air
from burst tyre
26. Because of _________________________is not zero, so Efficiency of Carnot will not null or zero.
a) Q1 b) T1 c) Q2 d) T2
27. Which of these remains constant in isobaric process?
a) Volume b) pressure c) temperature d)None of these
28. The absolute zero is the temperature at which:
a) 373 K b) 273.16 K c) 0K d) 3oK
29. The efficiency of the heat engine is ________________________________.
a) 10-20% b) 25-30%
c) 35-40% d) above 40%
30. The efficiency of the heat engine is ________________________________.
a) 5% b) 10% c)20% d) above 20%
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21.a 22. C
23. b 24. A 25. d 26.c
27.c 28. d 29.d 30.d
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