Heat & Thermodynamics

Q: Carnot cycle is :

(a) :  Reversible
(b) :  Irreversible
(c) :  Sometimes A, sometimes B
(d) :  None of these
(e) :  None of the Above
Answer:  Reversible
Explanation:  

Q: A certain engine converts 20% of available heat energy into work . Then its efficiency will be :

(a) :  0.2
(b) :  0.8
(c) :  0.5
(d) :  None of these
(e) :  None of the Above
Answer:  0.2
Explanation:  

Q: Tick the examples of an irreversible process :

(a) :  Evaporation and liquefaction
(b) :  Work done by friction and explosion
(c) :  Work done by friction and liquefaction
(d) :  Evaporation and explosion
(e) :  None of the Above
Answer:  Work done by friction and explosion
Explanation:  

Q: the temperature at which all the gasses become liquid is called

(a) :  274 K
(b) :  absolute zero
(c) :  -273 K
(d) :  both B and C
(e) :  None of the Above
Answer:  absolute zero
Explanation:  

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