MCQOPTIONS
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MCQOPTIONS
This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
According to which law, all perfect gases change in volume by (1/273)th of their original volume at 0° C for every 1°C change in temperature when pressure remains constant |
| A. | Joule's law |
| B. | Boyle's law |
| C. | Regnault's law |
| D. | Charles' law |
| Answer» E. | |
| 2. |
Consider the following statements:1. Gases have a very low critical temperature2. Gases can be liquefied by isothermal compression3. In engineering problems, water vapour in atmosphere is treated as an ideal or perfect gasWhich of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» C. 1 and 3 only | |
| 3. |
Boyle’s law states that: |
| A. | The pressure of a gas varies directly with the temperature at constant volume i.e. P ∝ T |
| B. | The product of pressure and volume of a given mass of a gas is constant at constant temperature i.e. PV = constant |
| C. | The volume of a gas varies directly with the temperature at constant pressure i.e. V ∝ T |
| D. | The pressure of a gas varies directly with volume at constant temperature i.e. P ∝ V |
| Answer» C. The volume of a gas varies directly with the temperature at constant pressure i.e. V ∝ T | |
| 4. |
In case of triatomic gas, the ratio of specific heats CP/CV would be |
| A. | 1 |
| B. | 1.33 |
| C. | 1.4 |
| D. | 1.41 |
| Answer» C. 1.4 | |
| 5. |
According to the Gay - Lussac law for a perfect gas, the absolute pressure of given mass varies directly as |
| A. | Temperature |
| B. | Absolute temperature |
| C. | Absolute temperature, if volume is kept constant |
| D. | Volume, if temperature is kept constant |
| Answer» D. Volume, if temperature is kept constant | |
| 6. |
According to kinetic theory of gases, at absolute zero temperature ________. |
| A. | Specific heat of molecules reduces to zero |
| B. | Kinetic energy of molecules reduces to zero |
| C. | Volume of gas reduce to zero |
| D. | Pressure of gas reduce to zero |
| Answer» C. Volume of gas reduce to zero | |
| 7. |
Generalized compressibility chart is drawn between: |
| A. | Compressibility factor(Z) on x-axis and reduced pressure(Pr) on y-axis |
| B. | Compressibility factor(Z) on y-axis and reduced temperature (Tr) on x-axis |
| C. | Reduced pressure(Pr) on y-axis and reduced temperature (Tr) on x-axis |
| D. | Compressibility factor(Z) on y-axis and reduced pressure(Pr) on x-axis |
| Answer» E. | |
| 8. |
Equal volume of all gases, at the same temperature and pressure, contain equal number of molecules. This is according to ________. |
| A. | Charle's law |
| B. | Avogadro's law |
| C. | Joule's law |
| D. | Gay Lussac law |
| Answer» C. Joule's law | |
| 9. |
According to Boyle's law for a perfect gas |
| A. | T2/T1 = P2/P1, if V is kept constant |
| B. | T2/T1 = V2/V1, if P is kept constant |
| C. | P1/P2 = V2/V1, if T is kept constant |
| D. | None of these |
| Answer» D. None of these | |
| 10. |
Hot wire anemometer is used to measure: |
| A. | Pressure in gases |
| B. | Liquid discharge |
| C. | Pressure in Liquids |
| D. | Gas velocities |
| Answer» E. | |
| 11. |
Number of components (C), phases (P) and degrees of freedom (F) are related by Gibbs phase rule as |
| A. | C – P – F = 2 |
| B. | F - C – P = 2 |
| C. | C + F – P = 2 |
| D. | P + F – C = 2 |
| Answer» E. | |
| 12. |
Boyle's law i.e. PV = constant is applicable to gases under |
| A. | all ranges of pressures |
| B. | only small range of pressures |
| C. | high range of pressures |
| D. | steady change of pressures |
| Answer» C. high range of pressures | |
| 13. |
In an isothermal process, the internal energy of gas molecules ________. |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increase/decrease depending on the properties of gas |
| Answer» D. may increase/decrease depending on the properties of gas | |
| 14. |
Molar specific heats of an ideal gas depend on |
| A. | its pressure |
| B. | its temperature |
| C. | both its pressure and temperature |
| D. | number of atoms in a molecule |
| Answer» E. | |
| 15. |
As per Avogadro’s law, volume of 1 kmol of any gas is ________ m3 at N.T.P. |
| A. | 22.413 |
| B. | 8.314 |
| C. | 273.15 |
| D. | None of these |
| Answer» B. 8.314 | |
| 16. |
As per Charles' law, the volume of a given mass of a perfect gas varies __________ as its absolute temperature, when the absolute pressure remains constant. |
| A. | directly |
| B. | indirectly |
| C. | no relation |
| D. | none of the above |
| Answer» B. indirectly | |
| 17. |
Ideal gas equation may be written as[ where, P = absolute pressure, v = specific volume, R = characteristic gas constant, T = absolute temperature, m = mass of gas, n = number of moles of gas, Z = compressibility factor: |
| A. | P v = RT |
| B. | P v = mRT |
| C. | P v = nRT |
| D. | Pv = ZRT |
| Answer» B. P v = mRT | |
| 18. |
A perfect vacuum is obtained when: |
| A. | absolute pressure is zero. |
| B. | atmospheric pressure is zero |
| C. | gauge pressure is positive |
| D. | gauge pressure is zero |
| Answer» B. atmospheric pressure is zero | |
| 19. |
A perfect gas is heated at constant pressure. The final volume of the gas becomes 1.5 times the initial volume. If its initial temperature is 30°C, the final temperature will be: |
| A. | 45°C |
| B. | 20°C |
| C. | 181.5°C |
| D. | 330°C |
| Answer» D. 330°C | |
| 20. |
If the value of n = 0 in the equation PVn = C, then the process is called |
| A. | Constant volume process |
| B. | Adiabatic process |
| C. | Constant pressure process |
| D. | Isothermal process |
| Answer» D. Isothermal process | |
| 21. |
According to kinetic theory of gases, the absolute temperature is attained when |
| A. | Volume of the gas is zero |
| B. | Pressure of the gas is zero |
| C. | Kinetic energy of the molecules is zero |
| D. | Specific heat of the gas is zero |
| Answer» D. Specific heat of the gas is zero | |
| 22. |
As per Boyle’s law, which one is the correct statement? |
| A. | \(P\ α\ \frac{1}{V}\) |
| B. | P α V |
| C. | \(T\ α\ \frac{1}{V}\) |
| D. | T α V |
| Answer» B. P α V | |