51
One kg of carbon produces __________ kg of carbon dioxide.
A)
$$\frac{3}{7}$$
B)
$$\frac{7}{3}$$
C)
$$\frac{{11}}{3}$$
D)
$$\frac{3}{{11}}$$
Answer & Solution
Answer: Option
C
52
If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
A)
80°C
B)
0°C
C)
40°C
D)
20°C
Answer & Solution
Answer: Option
B
53
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio and $$\gamma $$ = Ratio of specific heats)
A)
$$1 - {{\text{r}}^{\gamma - 1}}$$
B)
$$1 + {{\text{r}}^{\gamma - 1}}$$
C)
$$1 - \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$
D)
$$1 + \frac{1}{{{{\text{r}}^{\gamma - 1}}}}$$
Answer & Solution
Answer: Option
C
54
Work-done during adiabatic expansion is given by (where p1 , v1 , T1 = Pressure, volume and temperature for the initial condition of gas, p2 , v2 , T2 = Corresponding values for the final condition of gas, R = Gas constant and $$\gamma $$ = Ratio of specific heats)
A)
$$\frac{{{{\text{p}}_1}{{\text{v}}_1} - {{\text{p}}_2}{{\text{v}}_2}}}{{\gamma - 1}}$$
B)
$$\frac{{{\text{mR}}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{\gamma - 1}}$$
C)
$$\frac{{{\text{mR}}{{\text{T}}_1}}}{{\gamma - 1}}\left( {1 - \frac{{{{\text{p}}_2}{{\text{v}}_2}}}{{{{\text{p}}_1}{{\text{v}}_1}}}} \right)$$
D)
All of these
Answer & Solution
Answer: Option
D
55
According to First law of thermodynamics,
A)
Total internal energy of a system during a process remains constant
B)
Total energy of a system remains constant
C)
Work-done by a system is equal to the heat transferred by the system
D)
Internal energy, enthalpy and entropy during a process remain constant
Answer & Solution
Answer: Option
B
56
According to Kelvin-Planck’s statement of second law of thermodynamics,
A)
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B)
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
C)
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D)
None of the above
Answer & Solution
Answer: Option
C
57
According to Kelvin-Planck's statement of second law of thermodynamics,
A)
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
B)
It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
C)
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
D)
None of the above
Answer & Solution
Answer: Option
A
58
The heat and work are mutually convertible. This statement is called __________ law of thermodynamics.
A)
Zeroth
B)
First
C)
Second
D)
Third
Answer & Solution
Answer: Option
B
59
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?
A)
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
B)
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
C)
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
D)
None of the above
Answer & Solution
Answer: Option
B
60
Which of the following is the correct statement of the second law of thermodynamics?
A)
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
B)
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
C)
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D)
All of the above
Answer & Solution
Answer: Option
D
