Question Bank for JEE Main & Advanced Physics Thermodynamical Processes Isobaric and Isochoric Processes

Isobaric and Isochoric Processes Total Questions - 23

1)

A gas expands under constant pressure P from volume \[{{V}_{1}}\]to\[{{V}_{2}}\]. The work done by the gas is [CBSE PMT 1990; RPMT 2003]

A)
           \[P({{V}_{2}}-{{V}_{1}})\]

B)
           \[P({{V}_{1}}-{{V}_{2}})\]

C)
           \[P(V_{1}^{\gamma }-V_{2}^{\gamma })\]

D)
           \[P\frac{{{V}_{1}}{{V}_{2}}}{{{V}_{2}}-{{V}_{1}}}\]
View Solution
2)

When heat in given to a gas in an isobaric process, then [DPMT 2001]

A)
           The work is done by the gas

B)
           Internal energy of the gas increases

C)
           Both (a) and (b)

D)
           None from (a) and (b)
View Solution
3)

One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature T. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is

A)
           \[\frac{2V}{273}\]

B)
           \[\frac{V}{91}\]

C)
           \[\frac{V}{273}\]

D)
           V
View Solution
4)

A gas is compressed at a constant pressure of \[50N/{{m}^{2}}\] from a volume of \[10{{m}^{3}}\] to a volume of \[4{{m}^{3}}\]. Energy of 100 J then added to the gas by heating. Its internal energy is    [MNR 1994]

A)
           Increased by 400 J

B)
           Increased by 200 J

C)
           Increased by 100 J

D)
           Decreased by 200 J
View Solution
5)

Work done by air when it expands from 50 litres to 150 litres at a constant pressure of 2 atmosphere is

A)
           \[2\times {{10}^{4}}\]joules

B)
           \[2\times 100\]joules

C)
           \[2\times {{10}^{5}}\times 100\]joules

D)
           \[2\times {{10}^{-5}}\times 100\]joules
View Solution
6)

Work done by 0.1 mole of a gas at \[{{27}^{o}}C\] to double its volume at constant pressure is (R = 2 cal mol?1 oC?1) [EAMCET 1994]

A)
           54 cal

B)
           600 cal

C)
           60 cal

D)
           546 cal
View Solution
7)

Unit mass of a liquid with volume \[{{V}_{1}}\] is completely changed into a gas of volume \[{{V}_{2}}\] at a constant external pressure P and temperature T. If the latent heat of evaporation for the given mass is L, then the increase in the internal energy of the system is                                                                        [Roorkee 1999]

A)
           Zero

B)
           \[P({{V}_{2}}-{{V}_{1}})\]

C)
           \[L-P({{V}_{2}}-{{V}_{1}})\]

D)
           L
View Solution
8)

A gas expands \[0.25{{m}^{3}}\] at constant pressure \[{{10}^{3}}N/{{m}^{2}}\], the work done is [CPMT 1997; UPSEAT 1999; JIPMER 2001, 02]

A)
           2.5 ergs

B)
           250 J

C)
           250 W

D)
           250 N
View Solution
9)

Two kg of water is converted into steam by boiling at atmospheric pressure. The volume changes from \[2\times {{10}^{-3}}\,{{m}^{3}}\] to \[3.34{{m}^{3}}.\] The work done by the system is about                                        [Roorkee 2000]

A)
           ? 340 kJ

B)
           ? 170 kJ

C)
           170 kJ

D)
           340 kJ
View Solution
10)

An ideal gas has volume \[{{V}_{0}}\] at \[{{27}^{o}}C.\]It is heated at constant pressure so that its volume becomes \[2{{V}_{0}}.\] The final temperature is                                                                 [BCECE 2003]

A)
           \[{{54}^{o}}C\]

B)
           \[{{32.6}^{o}}C\]

C)
           \[327\ {}^\circ C\]

D)
           150 K
View Solution
11)

If 300 ml of a gas at \[{{27}^{o}}C\] is cooled to \[{{7}^{o}}C\] at constant pressure, then its final volume will be [Pb. PET 1999; BHU 2003; CPMT 2004]

A)
           540 ml

B)
           350 ml

C)
           280 ml

D)
           135 ml
View Solution
12)

Which of the following is correct in terms of increasing work done for the same initial and final state [RPMT 1996]

A)
           Adiabatic < Isothermal < Isobaric

B)
           Isobaric < Adiabatic < Isothermal

C)
           Adiabatic < Isobaric < Isothermal

D)
           None of these
View Solution
13)

A sample of gas expands from volume \[{{V}_{1}}\] to\[{{V}_{2}}\]. The amount of work done by the gas is greatest when the expansion is [CBSE PMT 1997; AIIMS 1998; JIPMER 2000]

A)
           Isothermal

B)
           Isobaric

C)
           Adiabatic

D)
           Equal in all cases
View Solution
14)

Which of the following is a slow process        [J & K CET 2000]

A)
           Isothermal

B)
           Adiabatic

C)
           Isobaric

D)
           None of these
View Solution
15)

How much work to be done in decreasing the volume of and ideal gas by an amount of \[2.4\times {{10}^{-4}}{{m}^{3}}\] at normal temperature and constant normal pressure of \[1\times {{10}^{5}}N/{{m}^{2}}\] [UPSEAT 1999]

A)
           28 joule

B)
           27 joule

C)
           25 joule

D)
           24 joule
View Solution
16)

A Container having 1 mole of a gas at a temperature 27°C has a movable piston which maintains at constant pressure in container of 1 atm. The gas is compressed until temperature becomes 127°C. The work done is (Cp for gas is 7.03 cal/mol?K)                                                 [DCE 2005]

A)
           703 J

B)
           814 J

C)
           121 J

D)
           2035 J
View Solution
17)

In a reversible isochoric change                              [NCERT 1990]

A)
           \[\Delta W=0\]

B)
           \[\Delta Q=0\]

C)
           \[\Delta T=0\]

D)
           \[\Delta U=0\]
View Solution
18)

Entropy of a thermodynamic system does not change when this system is used for                                         [AIIMS 1995]

A)
                   Conduction of heat from a hot reservoir to a cold reservoir

B)
                   Conversion of heat into work isobarically

C)
                   Conversion of heat into internal energy isochorically

D)
                   Conversion of work into heat isochorically
View Solution
19)

The work done in which of the following processes is zero [UPSEAT 2003]

A)
           Isothermal process

B)
           Adiabatic process

C)
           Isochoric process

D)
           None of these
View Solution
20)

In which thermodynamic process, volume remains same [Orissa PMT 2004]

A)
           Isobaric

B)
           Isothermal

C)
           Adiabatic

D)
           Isochoric
View Solution
21)

In an isochoric process if \[{{T}_{1}}={{27}^{o}}C\] and \[{{T}_{2}}={{127}^{o}}C,\] then \[{{P}_{1}}/{{P}_{2}}\] will be equal to                                                     [RPMT 2003]

A)
           9 / 59

B)
           2 / 3

C)
           3 / 4

D)
           At constant volume \[P\propto T\]Þ \[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{{{T}_{1}}}{{{T}_{2}}}\]Þ\[\frac{{{P}_{1}}}{{{P}_{2}}}=\frac{300}{400}=\frac{3}{4}\]
View Solution
22)

Which is incorrect                                                             [DCE 2001]

A)
           In an isobaric process, \[\Delta p=0\]

B)
           In an isochoric process, \[\Delta W=0\]

C)
           In an isothermal process, \[\Delta T=0\]

D)
           In an isothermal process, \[\Delta Q=0\]
View Solution
23)

Which relation is correct for isometric process [RPMT 2001; BCECE 2003]

A)
           \[\Delta Q=\Delta U\]\[\]

B)
           \[\Delta W=\Delta U\]

C)
           \[\Delta Q=\Delta W\]

D)
           None of these
View Solution

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JEE Main & Advanced Physics Thermodynamical Processes Question Bank

done Isobaric and Isochoric Processes Total Questions - 23

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Isobaric and Isochoric Processes Total Questions - 23