| 1 |
Cp and C, are specific heats at constant pressure and constant volume respectively. It
is observed that
Cp Ca for hydrogen gas
CpCb for nitrogen gas
The correct relation between a and b is
- a=1/14b
- a=b
- a=14b
- a=28b
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| 2 |
An ideal gas undergoes a quasi-static, reversible process in which its molar heat capacity C remains constant. If during this process the relation of pressure P and volume V is given by PV" = constant, then n is given by (Here Cp and C, are molar specific heat at constant pressure and constant volume, respectively)
- n= C-Cp/C-Cv
- n = CP-C/C-Cu
- n = C-C/C-Cp
- n=Cp/Cv
|
| 3 |
The ratio of specific heats (Cp/Cv) in terms of degree of freedom (f) is given by |
| 4 |
For an adiabatic expansion of an ideal gas, the fractional change in its pressure is equal to (where g is the ratio of specific heats):
- -V Y/dV
- -V dV/V
- 1 dV/ yV
- dV/V
|
| 5 |
n moles of an ideal gas with constant volume heat capacity Cy undergo an isobaric expansion by a certain volume. The ratio of the work done in the process, to the heat supplied is: |
| 6 |
A diatomic gas, having Cp = R and Cy = R, is heated at constant pressure. The ratio dU: dQ: dW:
- 5:7:2
- 3:5:2
- 3:7:2
- 5:7:3
|
| 7 |
A half mole of an ideal monoatomic gas is heated at a constant pressure of 1 atm from 20°C to 90°C. Work done by the gas is close to (Gas constant R = 8.31J/molK)
- 291J
- 581J
- 146J
- 73J
|
| 8 |
A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is TV = constant, then x is
- 2/5
- 2/3
- 5/3
- 3/5
|
| 9 |
In a process, the temperature and volume of one mole of an ideal monoatomic gas are varied according to the relation VT = K, where K is a constant. In this process, the temperature of the gas is increased by DT. The amount of heat absorbed by gas is (R is gas constant)
|
| 10 |
One mole of an ideal gas passes through a process where pressure and volume obey Here Po and Vo are constants. Calculate the change = Po in the temperature of the gas if its volume changes from Vo to 2V0. |
| 11 |
The volume V of a given mass of monoatomic gas changes with temperature T according to the relation V = KTS. The work done when the temperature changes by 90 K will be xR. The value of x is [R = universal gas constant] |
| 12 |
For the given cyclic process CAB as shown for a gas, the work done is
- 30J
- 10J
- 5J
- 1J
|
| 13 |
A gas can be taken from A and B via two different processes ACB and ADB. When path ACB is used 60 J of heat flows into the system and 30/ of work is done by the system. If path ADB is used work done by the system is 10 J. The heat flow into the system in path ADB is
- 100J
- 80J
- 20J
- 40J
|
| 14 |
One mole of diatomic ideal gas undergoes a cyclic process ABC. The process BC is adiabatic. The temperatures at A, B, and C are 400 K, 800 K, and 600 K respectively. Choose the correct statement.
- The change in internal energy in the whole cyclic process is 250R
- The change in internal energy in the process CA is 700R
- The change in internal energy in the process AB is -350R
- The change in internal energy in the process BC is-500R
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| 15 |
The given diagram shows four processes i.e., isochoric, isobaric, isothermal, and adiabatic. The correct assignment of the processes, in the same order, is given by:
- adcb
- adbc
- dabc
- dacb
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