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Standard XII
Physics
1st Law of Thermodynamics
12. in an iso...
Question
12. in an isothermal reaction of a gaseous sample the correct relation is a) w rev>w irrev b)w irrev> w rev c) q rev
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Q.
Which of the following is not a state function?
a.
U
+
P
V
b.
q
+
w
c.
q
r
e
v
T
d.
q
Q.
In an isothermal expansion of a gaseous sample the correct relation is:
(consider w(work) with sign according to new IUPAC convention)
[The reversible and irreversible processes are carried out between same initial and final states]
Q.
Let Q and W denote the amount of heat given to an ideal gas and the work done by it in an isothermal process.
(a) Q = 0
(b) W = 0
(c) Q ≠ W
(d) Q = W
Q.
A fan is rotating with angular velocity
100
rev/sec
. Then, it is switched off. It takes
5
minutes to stop. Find the average angular velocity during this interval.
(correct answer + 1, wrong answer - 0.25)
Q.
Calculate
q
,
w
,
Δ
U
for the isothermal reversible expansion of 1 mole of an ideal gas from an initial pressure of
1.0
b
a
r
to a final pressure of
0.1
b
a
r
at a constant temperature of
273
K
.
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