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Thermodynamics (Physics) · Ques. 17

NEET 2016 (Phase 1)MCQEasy📈 Topic in 38% papers+4−1
1

A gas is compressed isothermally to half its initial volume. The same gas is compressed separately through an adiabatic process until its volume is again reduced to half. Then

  1. Compressing the gas isothermally or adiabatically will require the same amount of work.
  2. Which of the case (whether compression through isothermal or through adiabatic process) requires more work will depend upon the atomicity of the gas.
  3. Compressing the gas isothermally will require more work to be done.
  4. Compressing the gas through adiabatic process will require more work to be done.

Answer

(4) Compressing the gas through adiabatic process will require more work to be done.

Solution

Work done on the gas = area under the P–V curve between V and V2.

Starting from the same state, during compression the adiabatic curve is steeper than the isothermal curve (PV = constant vs PV = constant, > 1).

⇒ At every intermediate volume, Padiabatic > Pisothermal (the gas also heats up in adiabatic compression)

⇒ Area under the adiabatic curve is larger

∴ Adiabatic compression requires more work, whatever the atomicity of the gas.

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Thermodynamics (Physics)

2

A refrigerator works between 4 and 30 . It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is (Take 1 cal = 4.2 Joules)

  1. 236.5 W
  2. 2365 W
  3. 2.365 W
  4. 23.65 W
NEET 2016 (Phase 1)
3

One mole of an ideal monatomic gas undergoes a process described by the equation PV3 = constant. The heat capacity of the gas during this process is

  1. 32 R
  2. 52 R
  3. 2R
  4. R
NEET 2016 (Phase 2)
4

The temperature inside a refrigerator is t2 C and the room temperature is t1 C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

  1. t1t1 - t2
  2. t1 + 273t1 - t2
  3. t2 + 273t1 - t2
  4. t1 + t2t1 + 273
NEET 2016 (Phase 2)
5

An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas ?

  1. Isochoric
  2. Isothermal
  3. Adiabatic
  4. Isobaric
AIPMT 2015
6

The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is -20 C, the temperature of the surroundings to which it rejects heat is

  1. 11 C
  2. 21 C
  3. 31 C
  4. 41 C
AIPMT 2015
7

A Carnot engine, having an efficiency of = 110 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

  1. 90 J
  2. 1 J
  3. 100 J
  4. 99 J
AIPMT 2015 (Cancelled)
8

One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure. [figure] The change in internal energy of the gas during the transition is

  1. 20 J
  2. -12 kJ
  3. 20 kJ
  4. -20 kJ
AIPMT 2015 (Cancelled)
9

Figure below shows two paths that may be taken by a gas to go from a state A to a state C. [figure] In process AB, 400 J of heat is added to the system and in process BC, 100 J of heat is added to the system. The heat absorbed by the system in the process AC will be

  1. 460 J
  2. 300 J
  3. 380 J
  4. 500 J
AIPMT 2015 (Cancelled)
10

A monatomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is (Take = 5/3)

  1. 64P
  2. 32P
  3. P/64
  4. 16P
AIPMT 2014
11

A thermodynamic system undergoes cyclic process ABCDA as shown in figure. The work done by the system in the cycle is [figure]

  1. P0V0
  2. 2P0V0
  3. P0V02
  4. zero
AIPMT 2014

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