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Thermodynamics (Physics) · Question 44

AIPMT 2009MCQEasy📈 Topic in 38% papers+4−1
1

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.

Answer

(1) In an isochoric process pressure remains constant.

Solution

In an isochoric process the volume remains constant (pressure can change). So statement (1) is not true.

In an isothermal process temperature is constant; in an adiabatic process PV = constant and the system is insulated from the surroundings (no heat exchange). These are true.

Answer: (1)

AIPMT 2009

Keep practising — Thermodynamics (Physics)

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

The efficiency of Carnot engine is 50\% and temperature of sink is 500 K. If temperature of source is kept constant and its efficiency raised to 60\%, then the required temperature of sink will be

  1. 100 K
  2. 600 K
  3. 400 K
  4. 500 K
AIPMT 2002
11

A scientist says that the efficiency of his heat engine which works at source temperature 127 and sink temperature 27 is 26\%, then

  1. it is impossible
  2. it is possible but less probable
  3. it is quite probable
  4. data are incomplete.
AIPMT 2001

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