MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the temperature is half the original temperature, the volume of black-body radiation is to be ____ adiabatically ____ times its original volume for radiation to remain at equilibrium. |
| A. | decreased, four |
| B. | decreased, eight |
| C. | increased, four |
| D. | increased, eight |
| Answer» E. | |
| 2. |
For a reversible isothermal change of volume, heat to be supplied reversibly to keep temperature constant is given by |
| A. | Q = (4/3)b*(T4)*(ΔV) |
| B. | Q = (2/3)b*(T2)*(ΔV) |
| C. | Q = (1/3)b*(T)*(ΔV) |
| D. | none of the mentioned |
| Answer» B. Q = (2/3)b*(T2)*(ΔV) | |
| 3. |
The Stefan-Boltzmann law is given by |
| A. | u = b*(T2) |
| B. | u = b*(T3) |
| C. | u = b*(T4) |
| D. | u = b*T |
| Answer» D. u = b*T | |
| 4. |
If u is the energy density then pressure(p) exerted by the black-body radiation in an enclosure is |
| A. | u/2 |
| B. | u/3 |
| C. | u/4 |
| D. | u |
| Answer» C. u/4 | |
| 5. |
The equation dH=Cp*dT holds good for |
| A. | any process for an ideal gas, even when the pressure changes |
| B. | for other substances it is true only when the pressure is constant |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 6. |
If the temperature is constant, enthaply |
| A. | changes with change in p |
| B. | changes with change in V |
| C. | changes with change in both p and V |
| D. | does not change with change in p or V |
| Answer» E. | |
| 7. |
Thermal radiation in equilibrium with enclosing walls possesses an energy that depends on volume and temperature. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 8. |
The equation dU=Cv*dT holds good for |
| A. | any process for an ideal gas, even when the volume changes |
| B. | for other substances it is true only when the volume is constant |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 9. |
If the temperature is constant, internal energy |
| A. | changes with change in p |
| B. | changes with change in V |
| C. | changes with change in both p and V |
| D. | does not change with change in p or V |
| Answer» E. | |
| 10. |
If temperature is constant, internal energy does not change. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 11. |
The energy equation is given by |
| A. | (∂U/∂V) = T*(∂p/∂T) + p |
| B. | (∂U/∂V) = T*(∂p/∂T) – p |
| C. | (∂U/∂V) = -T*(∂p/∂T) – p |
| D. | (∂U/∂V) = p – T*(∂p/∂T) |
| Answer» C. (∂U/∂V) = -T*(∂p/∂T) – p | |
| 12. |
For a system which undergoes an infinitesimal reversible process between two equilibrium states, the change in internal energy is |
| A. | dU = pdV – TdS |
| B. | dU = TdS + pdV |
| C. | dU = TdS – pdV |
| D. | dU = -TdS – pdV |
| Answer» D. dU = -TdS – pdV | |