Thermodynamics Test

Result

Thermodynamics Test - 84

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Question 1
1 / -0

When a gas is compressed adiabatically

A
$$V P ^ { r } = \operatorname { cons } \tan t$$

B
$$P / V ^ { \gamma } = \operatorname { cons } \tan t$$

C
$$P V ^ { r } = \operatorname { con } s \tan t$$

D
$$V / P ^ { \gamma } = c o n s \tan t$$

Solution
Question 2
1 / -0

The coefficient of performance of a refrigeration working between $${ 10 }^{ \circ }C$$ and $${ 20 }^{ \circ }$$ C is :-

A
1

B
14.15

C
28.3

D
3.53

Solution
Question 3
1 / -0

One mole of $$O_{ 2 }$$ gas having a volime equal to 22.2 litres. at 0 c and 1 atmospheic pressure isd compressed isothermaally so that its volume reduces to 11.2 litres. The work done in this process is

A
1672.5J

B
1728J

C
-1728J

D
-1572.5J

Solution
Question 4
1 / -0

The thermodynamic co-ordinates of a jar filled with gas A are P, V and T and another jar B filled with another gas are 2P,V/4 and 2T, where the symbols have their usual meaning. The ratio of the number of molecules of jar A to those of jar B is-

A
4:1

B
2:1

C
1:2

D
1:1

Solution
Question 5
1 / -0

A perfect gas is found to obey the relation $$ PV^{3/2} -= constant $$, during an adiabatic process . if such a gas , initially as a temperature T, is compressed adiabatically to half its initial volume, then its final temperature will be

A
2T

B
4T

C
$$\sqrt 2 T$$

D
2V2T

Solution
Question 6
1 / -0

The temperature of an ideal gas in a sealed $$0.50\,{m^3}$$ container is reduced from 370 K to 270 K. the final pressure of the gas is 80 kPa .the molar heat capacity at constant volume of the gas is 280.0 J/mol K.
2. The work done by the gas, in kJ , is closest to.

A
zero

B
+50

C
+65

D
-50
Question 7
1 / -0

one ruble of a gas expands obeying the relation as shown in the P-V diagram the maximum temperature in this process is equal to

A
$$\dfrac { { P }_{ 0 }{ V }_{ 0 } }{ R } $$

B
$$\dfrac { { 3P }_{ 0 }{ V }_{ 0 } }{ R } $$

C
$$\dfrac { { 9P }_{ 0 }{ V }_{ 0 } }{ 8R } $$

D
None of these

Solution
Question 8
1 / -0

Directions For Questions

Two identical gas samples are initially at same temperature and pressure they are separately taken into two cylinders of volume V (each) and are compressed to volume $$ \frac {V}{2} $$ one isothermally and other adiabtically

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Entropy change for surrounding is

A
positive for adiabatic process

B
negative for adiabatic process

C
positive for isothermal process

D
zero for isothermal process
Question 9
1 / -0

A monoatomic ideal gas is expanded adiabatically to n times of its initial volume.The ratio of final rate of collisions of molecules with unit area of container walls to the initial rate will be:-

A
$$ n^{-4/3} $$

B
$$ n^{4/3} $$

C
$$ n^{2/3} $$

D
$$ n^{-5/3} $$

Solution
Question 10
1 / -0

$$RMS$$ speed of a monatomic gas is increased to two times of its initial value. If the process is done adiabatically then the ratio of final volume to initial volume will be

A
$$1:4$$

B
$$1:8$$

C
$$1:2^{3/2}$$

D
$$1:4^{2/3}$$