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question_answer1)
For an ideal gas, in an isothermal process [BHU 1998]
A)
Heat content remains constant done
clear
B)
Heat content and temperature remain constant done
clear
C)
Temperature remains constant done
clear
D)
None of the above done
clear
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question_answer2)
Can two isothermal curves cut each other
A)
Never done
clear
B)
Yes done
clear
C)
They will cut when temperature is 0°C done
clear
D)
Yes, when the pressure is critical pressure done
clear
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question_answer3)
In an isothermal expansion [KCET 2000; AFMC 2001]
A)
Internal energy of the gas increases done
clear
B)
Internal energy of the gas decreases done
clear
C)
Internal energy remains unchanged done
clear
D)
Average kinetic energy of gas molecule decreases done
clear
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question_answer4)
In an isothermal reversible expansion, if the volume of 96 gm of oxygen at 27°C is increased from 70 litres to 140 litres, then the work done by the gas will be
A)
\[300\,R{{\log }_{10}}2\] done
clear
B)
\[81\,R{{\log }_{e}}2\] done
clear
C)
\[900\,R{{\log }_{10}}2\] done
clear
D)
\[2.3\times 900\,R{{\log }_{10}}2\] done
clear
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question_answer5)
A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated) [MP PMT 1993]
A)
4/3 m done
clear
B)
0.5 m done
clear
C)
2.0 m done
clear
D)
3/4 m done
clear
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question_answer6)
For an isothermal expansion of a perfect gas, the value of \[\frac{\Delta P}{P}\] is equal [CPMT 1980]
A)
\[-{{\gamma }^{1/2}}\frac{\Delta V}{V}\] done
clear
B)
\[-\frac{\Delta V}{V}\] done
clear
C)
\[-\gamma \frac{\Delta V}{V}\] done
clear
D)
\[-{{\gamma }^{2}}\frac{\Delta V}{V}\] done
clear
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question_answer7)
The gas law \[\frac{PV}{T}=\] constant is true for [MNR 1974; MP PMT 1984; BHU 1995, 98, 2000]
A)
Isothermal changes only done
clear
B)
Adiabatic changes only done
clear
C)
Both isothermal and adiabatic changes done
clear
D)
Neither isothermal nor adiabatic changes done
clear
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question_answer8)
One mole of \[{{O}_{2}}\] gas having a volume equal to 22.4 litres at \[{{0}^{o}}C\] and 1 atmospheric pressure in compressed isothermally so that its volume reduces to 11.2 litres. The work done in this process is [MP PET 1993; BVP 2003]
A)
\[1672.5\ J\] done
clear
B)
1728 J done
clear
C)
\[-1728J\] done
clear
D)
\[-1572.5\ J\] done
clear
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question_answer9)
If a gas is heated at constant pressure, its isothermal compressibility [MP PET 1984]
A)
Remains constant done
clear
B)
Increases linearly with temperature done
clear
C)
Decreases linearly with temperature done
clear
D)
Decreases inversely with temperature done
clear
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question_answer10)
Work done per mol in an isothermal change is [RPMT 2004; BCECE 2005]
A)
\[RT{{\log }_{10}}\frac{{{V}_{2}}}{{{V}_{1}}}\] done
clear
B)
\[RT{{\log }_{10}}\frac{{{V}_{1}}}{{{V}_{2}}}\] done
clear
C)
\[RT{{\log }_{e}}\frac{{{V}_{2}}}{{{V}_{1}}}\] done
clear
D)
\[RT{{\log }_{e}}\frac{{{V}_{1}}}{{{V}_{2}}}\] done
clear
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question_answer11)
The isothermal Bulk modulus of an ideal gas at pressure P is [CPMT 1974, 81; UPSEAT 1998; IIT 1998]
A)
P done
clear
B)
\[\gamma P\] done
clear
C)
P / 2 done
clear
D)
P / g done
clear
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question_answer12)
In isothermal expansion, the pressure is determined by [AFMC 1995]
A)
Temperature only done
clear
B)
Compressibility only done
clear
C)
Both temperature and compressibility done
clear
D)
None of these done
clear
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question_answer13)
The isothermal bulk modulus of a perfect gas at normal pressure is [AFMC 1997]
A)
\[1.013\times {{10}^{5}}N/{{m}^{2}}\] done
clear
B)
\[1.013\times {{10}^{6}}N/{{m}^{2}}\] done
clear
C)
\[1.,013\times {{10}^{-11}}N/{{m}^{2}}\] done
clear
D)
\[1.013\times {{10}^{11}}N/{{m}^{2}}\] done
clear
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question_answer14)
In an isothermal change, an ideal gas obeys [EAMCET 1994; CPMT 1999]
A)
Boyle's law done
clear
B)
Charle's law done
clear
C)
Gaylussac law done
clear
D)
None of the above done
clear
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question_answer15)
In isothermic process, which statement is wrong [RPMT 1997]
A)
Temperature is constant done
clear
B)
Internal energy is constant done
clear
C)
No exchange of energy done
clear
D)
(a) and (b) are correct done
clear
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question_answer16)
An ideal gas A and a real gas B have their volumes increased from V to 2 V under isothermal conditions. The increase in internal energy [CBSE PMT 1993; JIPMER 2001, 02]
A)
Will be same in both A and B done
clear
B)
Will be zero in both the gases done
clear
C)
Of B will be more than that of A done
clear
D)
Of A will be more than that of B done
clear
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question_answer17)
The specific heat of a gas in an isothermal process is [AFMC 1998]
A)
Infinite done
clear
B)
Zero done
clear
C)
Negative done
clear
D)
Remains constant done
clear
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question_answer18)
A thermally insulated container is divided into two parts by a screen. In one part the pressure and temperature are P and T for an ideal gas filled. In the second part it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will [RPET 1999]
A)
Decrease done
clear
B)
Increase done
clear
C)
Remain same done
clear
D)
None of the above done
clear
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question_answer19)
A container that suits the occurrence of an isothermal process should be made of [Pb. PMT 2000]
A)
Copper done
clear
B)
Glass done
clear
C)
Wood done
clear
D)
Cloth done
clear
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question_answer20)
In an isothermal process the volume of an ideal gas is halved. One can say that [MP PMT 2004]
A)
Internal energy of the system decreases done
clear
B)
Work done by the gas is positive done
clear
C)
Work done by the gas is negative done
clear
D)
Internal energy of the system increases done
clear
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question_answer21)
A thermodynamic process in which temperature T of the system remains constant though other variable P and V may change, is called [Pb. PMT 2004]
A)
Isochoric process done
clear
B)
Isothermal process done
clear
C)
Isobaric process done
clear
D)
None of these done
clear
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question_answer22)
If an ideal gas is compressed isothermally then [RPMT 2003]
A)
No work is done against gas done
clear
B)
Heat is relased by the gas done
clear
C)
The internal energy of gas will increase done
clear
D)
Pressure does not change done
clear
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question_answer23)
When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be \[1.5\times {{10}^{4}}\ joules\]. During this process about [MP PMT 1987]
A)
\[3.6\times {{10}^{3}}\] cal of heat flowed out from the gas done
clear
B)
\[3.6\times {{10}^{3}}\] cal of heat flowed into the gas done
clear
C)
\[1.5\times {{10}^{4}}\] cal of heat flowed into the gas done
clear
D)
\[1.5\times {{10}^{4}}\] cal of heat flowed out from the gas done
clear
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question_answer24)
When heat is given to a gas in an isothermal change, the result will be [MP PET 1995; RPMT 1997]
A)
External work done done
clear
B)
Rise in temperature done
clear
C)
Increase in internal energy done
clear
D)
External work done and also rise in temp. done
clear
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question_answer25)
When 1 gm of water at \[{{0}^{o}}C\] and \[1\times {{10}^{5}}\ N/{{m}^{2}}\] pressure is converted into ice of volume \[1.091\ c{{m}^{2}}\], the external work done will be
A)
0.0091 joule done
clear
B)
0.0182 joule done
clear
C)
? 0.0091 joule done
clear
D)
? 0.0182 joule done
clear
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question_answer26)
The latent heat of vaporisation of water is 2240 J/gm. If the work done in the process of expansion of 1 g is 168 J, then increase in internal energy is [Pb. PET 1998; CPMT 2000]
A)
2408 J done
clear
B)
2240 J done
clear
C)
2072 J done
clear
D)
1904 J done
clear
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question_answer27)
540 calories of heat convert 1 cubic centimeter of water at \[{{100}^{o}}C\] into 1671 cubic centimeter of steam at \[{{100}^{o}}C\] at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly
A)
540 cal done
clear
B)
40 cal done
clear
C)
Zero cal done
clear
D)
500 cal done
clear
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question_answer28)
One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is (R = 8.31 J/mole-K) [MP PMT 1995; UPSEAT 2000]
A)
750 joules done
clear
B)
1728 joules done
clear
C)
1500 joules done
clear
D)
3456 joules done
clear
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question_answer29)
A cylinder fitted with a piston contains 0.2 moles of air at temperature 27°C. The piston is pushed so slowly that the air within the cylinder remains in thermal equilibrium with the surroundings. Find the approximate work done by the system if the final volume is twice the initial volume [BHU (Med.) 2000]
A)
543 J done
clear
B)
345 J done
clear
C)
453 J done
clear
D)
600 J done
clear
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question_answer30)
The volume of an ideal gas is 1 litre and its pressure is equal to 72cm of mercury column. The volume of gas is made 900 cm3 by compressing it isothermally. The stress of the gas will be [UPSEAT 1999]
A)
8 cm (mercury) done
clear
B)
7 cm (mercury) done
clear
C)
6 cm (mercury) done
clear
D)
4 cm (mercury) done
clear
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question_answer31)
During an isothermal expansion of an ideal gas [UPSEAT 2005]
A)
Its internal energy decreases done
clear
B)
Its internal energy does not change done
clear
C)
The work done by the gas is equal to the quantity of heat absorbed by it done
clear
D)
Both (b) and (c) are correct done
clear
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