1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency ?
A
380 K
B
275 K
C
325 K
D
250 K
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Which of the following processes is reversible?
A
Transfer of heat by conduction
B
Transfer of heat by radiation
C
Isothermal compression
D
Electrical heating of a nichrome wire.
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
An ideal gas heat engine operates in Carnot cycle between 227oC and 127oC. It absorbs 6 $$ \times $$ 104 cal of heat at higher temperature. Amount of heat converted to work is
A
4.8 $$ \times $$ 104 cal
B
6 $$ \times $$ 104 cal
C
2.4 $$ \times $$ 104 cal
D
1.2 $$ \times $$ 104 cal.
4
AIPMT 2004
MCQ (Single Correct Answer)
+4
-1
One mole of an ideal gas at an initial temperature of T K does 6R joule of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be
A
(T + 2.4) K
B
(T $$-$$ 2.4) K
C
(T + 4) K
D
(T $$-$$ 4) K
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