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Thermodynamics (Physics) · Question 42

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
1

If and represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?

  1. = - , in an adiabatic process
  2. = , in an isothermal process
  3. = , in an adiabatic process
  4. = - , in an isothermal process

Answer

(1) = - , in an adiabatic process

Solution

First law of thermodynamics: = +

In an adiabatic process = 0

= -

(In an isothermal process of an ideal gas = 0, so neither (2) nor (4) holds in general.)

Answer: (1)

AIPMT 2010 (Prelims)

Keep practising — Thermodynamics (Physics)

2

The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is

  1. 6400 J
  2. 5400 J
  3. 7900 J
  4. 8900 J
AIPMT 2009
3

In thermodynamic processes which of the following statements is not true ?

  1. In an isochoric process pressure remains constant.
  2. In an isothermal process the temperature remains constant.
  3. In an adiabatic process PV = constant.
  4. In an adiabatic process the system is insulated from the surroundings.
AIPMT 2009
4

If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then

  1. E = 0
  2. Q = 0
  3. W = 0
  4. Q = W = 0
AIPMT 2008
5

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62 , its efficiency is doubled. Temperatures of the source is

  1. 37
  2. 62
  3. 99
  4. 124
AIPMT 2007
6

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?

  1. 380 K
  2. 275 K
  3. 325 K
  4. 250 K
AIPMT 2006
7

The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is

  1. 9/7
  2. 7/5
  3. 8/7
  4. 5/7
AIPMT 2006
8

An ideal gas heat engine operates in Carnot cycle between 227 and 127 . It absorbs 6 104 cal of heat at higher temperature. Amount of heat converted to work is

  1. 4.8 104 cal
  2. 6 104 cal
  3. 2.4 104 cal
  4. 1.2 104 cal
AIPMT 2005
9

Which of the following processes is reversible?

  1. Transfer of heat by conduction
  2. Transfer of heat by radiation
  3. Isothermal compression
  4. Electrical heating of a nichrome wire
AIPMT 2005
10

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

  1. (T + 2.4) K
  2. (T - 2.4) K
  3. (T + 4) K
  4. (T - 4) K
AIPMT 2004
11

An ideal gas heat engine operates in a Carnot cycle between 227 C and 127 C. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to

  1. 4.8
  2. 3.5
  3. 1.6
  4. 1.2
AIPMT 2003

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