Kelvin
Statement-
It is impossible to get a continuous supply of work
from a body by colling it to a temperature lower than that of its surrounding.
Planks
Statement-
It is impossible to construct an engine which work in
a complete cycle will produce no effect other than the raising of a weight and
cooling of a reservoir.
Kelvin-Plank
Statement-
It is impossible to construct an engine which
operating in a cycle has the sole effect of extracting heat from a reservoir
and performing an equivalent amount of work.
Clausius
Statement-
It is impossible for a self-acting machine working in
a cyclic process unaided by external agency to transfer heat from a body at a
lower temperature to a body at a higher temperature.
1. Kelvin Planck’s law deals with
(a) conservation of heat
(b) conservation of work
(c) conversion of heat into work
(d) conversion fo work into heat
Answer : c
2. According to Clausius statement of
second law of thermodynamics
(a) heat can’t be transferred from low
temperature source to high temperature source
(b) heat can be transferred for low
temperature to high temperature source by using refrigeration cycle.
(c) heat can be transferred from low
temperature to high temperature source if COP of process is more than unity
(d) heat can’t be transferred from low
temperature to high temperature source without the aid of external energy
(e) all of the above.
Answer : d
3. Which of the following laws was
formulated by Nernst?
(a)First law of
thermodynamics
(b) Second law of
thermodynamics
(c)Third law of thermodynamics
(d) None of the above
Answer: (c)
4. Second law of thermodynamics is
defined the
(a) Enthalpy
(b) Entropy
(c) Internal energy
(d) Pressure
Answer: b
5. Heat transfer take place according to
......
(a) Zeroth law of
thermodynamics
(B) First law of thermodynamics
(c) Second law of
thermodynamics
(d) Third law of thermodynamics
Answer: c
6. Which law of thermodynamics says that
efficiency of a heat engine cannot be 1?
(a)First
(b) zero
(c) second
(d) third
Answer: c
Hint- entropy
change in an Irreversible process has to be positive this means that heat given
to an engine cannot be totally converted into work therefore efficiency cannot
be 1
7. The second law of thermodynamics states
that
(a)
Entropy of an isolated system and
never decrease over time
(b)
Entropy of a pure crystalline
substance at zero kelvin is zero
(c)
Energy is conserved
(d)
Entropy of a system can never
decrease
Answer: a
Nice sir
ReplyDeleteYou there, this is really good post here. Thanks for taking the time to post such valuable information. Quality content is what always gets the visitors coming. Abraham Lincoln University
ReplyDelete