Q. No.In thermodynamic processes, which of the following statements is not true?
1.
In an adiabatic process, the system is insulated from the surroundings.
2.
In an isochoric process, the pressure remains constant.
3.
In an isothermal process, the temperature remains constant.
4.
In an adiabatic process, \(P V^\gamma\) = constant.
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In isothermal expansion, the pressure is determined by:
| 1. | Temperature only |
| 2. | Compressibility only |
| 3. | Both temperature and compressibility |
| 4. | None of these |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Under isothermal conditions, the volumes of ideal gas A and actual gas B grow from V to 2 V. The increase in internal energy:
| 1. | will be the same in both A and B. |
| 2. | will be zero in both the gases. |
| 3. | of B will be more than that of A. |
| 4. | of A will be more than that of B. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The specific heat of a gas in an isothermal process is:
| 1. | Infinite | 2. | Zero |
| 3. | Negative | 4. | Remains constant |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
The pressure and density of a diatomic gas changes adiabatically from (P, d) to (P', d'). If , then should be:
| 1. | 1/128 | 2. | 32 |
| 3. | 128 | 4. | None of the above |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
Two identical samples of a gas are allowed to expand, (i) isothermally and (ii) adiabatically. Work done will be:
| 1. | more in the isothermal process. |
| 2. | more in the adiabatic process. |
| 3. | equal in both processes. |
| 4. | none of the above. |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In an adiabatic expansion of a gas, if the initial and final temperatures are \(T_1\) and \(T_2\), respectively, then the change in internal energy of the gas is:
1. \(\frac{nR}{\gamma-1}(T_2-T_1)\)
2. \(\frac{nR}{\gamma-1}(T_1-T_2)\)
3. \(nR ~(T_1-T_2)\)
4. Zero
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of the gas will be:
| 1. | (T + 2.4)K | 2. | (T – 2.4)K |
| 3. | (T + 4)K | 4. | (T – 4)K |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In a cyclic process, the internal energy of the gas:
| 1. | Increases | 2. | Decreases |
| 3. | Remains constant | 4. | Becomes zero |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
In a Carnot engine, when \(T_2=0^\circ \mathrm{C}\) and \(T_1=200^\circ \mathrm{C},\) its efficiency is \(\eta_1\) and when \(T_1=0^\circ \mathrm{C}\) and \(T_2=-200^\circ \mathrm{C},\) its efficiency is \(\eta_2.\) What is the value of \(\frac{\eta_1}{\eta_2}?\)
| 1. | 0.577 | 2. | 0.733 |
| 3. | 0.638 | 4. | cannot be calculated |
To unlock all the explanations of this course, you need to be enrolled.
To unlock all the explanations of this course, you need to be enrolled.
© 2024 GoodEd Technologies Pvt. Ltd.