Thermodynamics Test

Directions For Questions

The work done during adiabatic reversible process is given by $$\displaystyle w=\dfrac { nR[{ T }_{ f }-{ T }_{ i }] }{ \gamma -1 } $$. Thus, if $$\displaystyle { T }_{ f }>{ T }_{ i }$$, then since $$\displaystyle \gamma-1=+ve\ (\because \gamma >1)$$, the work done is +ve i.e., work is done on gas. Also if $$\displaystyle { T }_{ f }<{ T }_{ i },w=-ve$$, thus work is done by the gas.

The adiabatic process are more steeper than isothermal process and slope of adiabatic process $$\displaystyle =\gamma \times $$slope of isothermal process and slope of adiabatic process > slope of isothermal process (since $$\displaystyle \gamma >1$$). Also the adiabatic process obey $$\displaystyle { PV }^{ \gamma }$$= constant, whereas in isothermal process PV = constant.

...view full instructions

Which of the following shows adiabatic process in the figures given below?

Thermodynamics ...

Question 1

(i), (ii), (iii)

(i), (ii)

(i), (iii)

(i)

Question 2

$$T_A=T_B=T_C$$

$$V_A < V_B, P_B < P_C$$

$$W_{AB} > W_{BC}$$

$$U_A < U_B$$

Question 3

$$T_1 > T_2$$

$$T_1 = T_2$$

$$T_1 < T_2$$

the relation between $$T_1$$ and $$T_2$$ cannot be deduced

Question 4

$$P_1 < P_2$$

$$P_1=P_2$$

$$P_1 > P_2$$

the relation between $$P_1$$ and $$P_2$$ cannot be deduced

Question 5

II. III

I, III

II, IV

I, IV

Question 6

$$\displaystyle W+W_{b}=\Delta U$$

$$\displaystyle H\neq 0$$

$$\displaystyle H=\Delta U$$

W = 0

Question 7

$${ 1 }/{ \gamma }$$

$$\gamma $$

$$\gamma -1$$

$$\gamma +1$$

Question 8

$$\displaystyle { 99 }^{ \circ }C,{ 37 }^{ \circ }C$$

$$\displaystyle { 80 }^{ \circ }C,{ 37 }^{ \circ }C$$

$$\displaystyle { 95 }^{ \circ }C,{ 37 }^{ \circ }C$$

$$\displaystyle { 90 }^{ \circ }C,{ 37 }^{ \circ }C$$

Question 9

$$167.4\ kJ$$

$$16.7\ kJ$$

$$8.4\ kJ$$

$$4.2\ kJ$$

Question 10

240 J absorbed

240 J dissipated

880 J absorbed

880 J dissipated

None of the above

User

Question Analysis

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.