Q.1
In the given pressure-volume diagram, the isochoric, isothermal, isobaric and isotropic parts respectively are .. [ UCET 1995]
ch-12_que_no-61_img_no1.png
  • a)BA, AD, DC, CB
  • b) DC, CB, BA, AD
  • c)AB, BC, CD, DA
  • d)CD, DA, AB, BC
Q.2
In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out 30 joule of heat and 10 joule of work is done on the gas. If the initial internal energy of the gas was 40 joule, then the final internal energy will be ..[ CPMT 1988]
  • a) zero
  • b) 80 joule
  • c)20 joule
  • d)-20 joule
Q.3
When water is heated from 0° to 4° then ..[ AP 1986]
  • a) Cp=Cv
  • b) Cp > Cv
  • c) Cp < Cv
  • d) Cp - Cv=R
Q.4
One mole of an ideal mono atomic gas is heated at a constant pressure of one atmosphere from 0° to 100°. Then work done by the gas is [ CPMT 1991]
  • a) 6.56 joules
  • b) 8.32×102 joules
  • c) 12.48×102 joules
  • d) 20.8×102 joules
Q.5
The curve which represents an adiabatic change is [ AMU 1995]
  • a)
    ch-12_qn-65choice_img_no1.png
  • b)
    ch-12_qn-65choice_img_no2.png
  • c)
    ch-12_qn-65choice_img_no3.png
  • d)
    ch-12_qn-65choice_img_no4.png
Q.6
The amount of work done in a an adiabatic expansion from temperature T to T' for a gram mole of gas is given by
  • a) R (T - T')
  • b) R(T - T') / (γ- 1)
  • c)RT
  • d)R(T-T') (γ - 1)
Q.7
A monoatomic gas initially at 180°C is compressed adiabatically to one-eighth of its original volume. The temperature after compression will be [ CBSE 1996]
  • a) 180°C
  • b) 144°C
  • c)891°C
  • d)887°C
Q.8
At same temperature, pressure and volume the quantity which is same between gases will be [ Raj.PMT 1996]
  • a) Number of atoms
  • b) Average kinetic energy
  • c) Mean square velocity
  • d) Mean free path
Q.9
In isothermic process, which statement is wrong
  • a)Temperature is constant
  • b) Internal energy will be constant
  • c)No exchange of energy
  • d)(a) and (b) are correct
Q.10
One mole of an ideal mono-atomic gas changes from state A to B as shown in figure. In this process the work done and change in internal energy are
ch-12_que_no-70_img_no1.png
  • a) P1V1 ; 3P1V1
  • b) (3/2)P1V1 ; (9/2)P1V1
  • c)(3/2)P1V1 ; (3)P1V1
  • d)(3/2)P1V1 ; P1V1
Q.11
For adiabatic process, wrong statement is [ Raj. PMT 1997]
  • a) dQ=0
  • b) dU - -W
  • c)Q=constant
  • d)Entropy is not constant
Q.12
The process in which no heat enters or leaves the system is termed as [ BHU 1998]
  • a) isochoric
  • b) isobaric
  • c) isothermal
  • d) adiabatic
Q.13
Two samples A and B of a gas initially at the same temperature and pressure, are compressed from volume V to V/2 ( A isothermally and b adiabatically). The final pressure of [ MPPMT 1997]
  • a)A is greater than that of B
  • b) A is equal to that of B
  • c)A is less than that of B
  • d)A is twice that of B
Q.14
If one mole of monoatomic gas ( γ=5/3) is mixed with one mole of diatomic gas ( γ=7/5). The value of γ for the mixture is [ Raj.PET 1996]
  • a) 1.4
  • b) 1.5
  • c)1.53
  • d)3.07
Q.15
In an ideal gas, the energy is .. [ AFMC 1994]
  • a) wholly kinetic
  • b) wholly potential
  • c)sum of the two
  • d)all are true
Q.16
Arrange in ascending order of work done [ Raj. PMT 1996]
  • a) Adiabatic > Isothermal > Isobaric
  • b) Isothermal >Adiabatic > Isochoric
  • c) Adiabatic > Isobaric > Isothermal
  • d) None of the above
Q.17
The isothermal bulk modulus of an ideal gas at pressure P is
  • a)P
  • b) γP
  • c)P/2
  • d) P / γ
Q.18
The adiabatic bulk modulus of a ideal gas at pressure P is given by
  • a) P
  • b) 2P
  • c)P/2
  • d)γP
Q.19
Half mole of an ideal gas at temperature of 27°C undergoes an isothermal expansion so that the final volume is double the initial volume. The work done by the gas is ( R=8.3 J/mol K)
  • a) 860 J
  • b) 1720 J
  • c)0.78J
  • d)zero
Q.20
The adiabatic elasticity of hydrogen gas at N.T.P is ( γ=1.4) [ MPPMT 1990]
  • a) 1×105 N/m2
  • b) 1×10-8 N/m2
  • c) 1.4 N/m2
  • d) 1.4×105 N/m2
Q.21
For ideal gas , which statement is not true.. [ Raj. PMT 1997]
  • a)It obeys Boyle's law
  • b) Follows PV=RT
  • c)Internal energy depends on temperature only
  • d)Follows Vander Waal's equation
Q.22
An ideal gas at 27°C is compressed adiabatically to 8/27 of its original volume [ TVγ-1=constant and γ=5/3]. Then the rise in temperature is [ CPMT 1998]
  • a) 450°C
  • b) 375°C
  • c)225°C
  • d)400°C
Q.23
If R is the gas constant for 1 gm mole, and Cp and Cv are specific heats for solid per mole at constant pressure and volume respectively, then
  • a)Cp - Cv=R
  • b) Cp - Cv < R
  • c)Cp - Cv=0
  • d)Cp - Cv > R
Q.24
If for hydrogen Cp - Cv=a for oxygen Cp - Cv=b where Cp and Cv refers to specific heat at constant pressure and constant volume per unit mass, the [ CBSE 1993]
  • a) a=b
  • b) a=16 b
  • c) b=16a
  • d) a and b are not related
Q.25
A gas expands from a volume of 2 m3 to 6m3 at a constant pressure of 10N/m2 and then at a constant volume of 6m3, the pressure is changed from 10N/m2 to 20N/mThe work done by the gas is [ CBSE 1993]
  • a)100 J
  • b) 40 J
  • c)40 erg
  • d)60 J
Q.26
A nonconducting partition divides a container into two equal compartments. One filled with helium gas at 200K and the other is filled with oxygen gas at 400k. The number of molecules in each gas is the same. If the partition is removed to allow the gases to mix, the final temperature will be [ CBSE 1993]
  • a) 350 K
  • b) 325 K
  • c)300 K
  • d)275 K
Q.27
Work done by 0.1 mole of gas at 27°C to double its volume at constant pressure is ..(R=2 cal/mol K) [ EAMCET 1994]
  • a) 54 cal
  • b) 600 cal
  • c)60 cal
  • d)546 cal
Q.28
Which is correct statement? [ MPPMT 1993]
  • a) For isothermal change PV=constant
  • b) In an isothermal process the change in internal energy must be equal to the work done
  • c) For an adiabatic change P2 / P1=(V2 / V1)γ, where γ is the ratio of specific heats
  • d) In an adiabatic process, the external work done must be equal to the heat entering the system
Q.29
A body of mass 5kg falls from a height of 20m on the ground and it rebounds to a height of 0.2m. If the loss in potential energy is used up by the body, then what will be the temperature rise? ( specific heat of material=0.09 cal/gm°C) .. [ CPMT 1998]
  • a)5°C
  • b) 4°C
  • c)8°C
  • d)none of above
Q.30
The density of steam is 0.6 kg/m3, 1gm water at 100°C and 1×105 N/m2 pressure is converted into steam. The external work done nearly
  • a) 0.6×105 J
  • b) 1700 J
  • c)17 J
  • d)170 J
0 h : 0 m : 1 s