MCQOPTIONS
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MCQOPTIONS
This section includes 111 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Area under the stress-strain curve when load is gradually applied in tension represents the |
| A. | Strain energy |
| B. | Strain energy density |
| C. | Strain energy per unit weight |
| D. | Strain energy per unit area |
| Answer» C. Strain energy per unit weight | |
| 2. |
σ1, σ2, σ3 are the three mutually perpendicular principal stresses with ε1, ε2, and ε3 being the strains produced in the respective directions of the stress, the strain energy stored per unit volume in a cube is |
| A. | \(\frac{1}{2}(\sigma_1^2 \epsilon_1^2 +\sigma_2^2 \epsilon_2^2+\sigma_3^2 \epsilon_3^2)\) |
| B. | σ1ε1 + σ2ε2 + σ3ε3 |
| C. | \(\frac{1}{2}(\sigma_1 \epsilon_1^2 +\sigma_2 \epsilon_2^2+\sigma_3 \epsilon_3^2)\) |
| D. | \(\frac{1}{2}(\sigma_1 \epsilon_1 +\sigma_2 \epsilon_2+\sigma_3 \epsilon_3)\) |
| Answer» E. | |
| 3. |
For the state of stress of pure shear τ, the strain energy stored per unit volume in the elastic, homogeneous, isotropic material having elastic constants – Young’s modulus, E and Poisson’s ratio v will be |
| A. | \(\frac{{{\tau ^2}}}{{E}}\left( {1 + v} \right)\) |
| B. | \(\frac{{{\tau ^2}}}{{2E}}\left( {1 + v} \right)\) |
| C. | \(\frac{{{2\tau ^2}}}{{E}}\left( {1 + v} \right)\) |
| D. | \(\frac{{{\tau ^2}}}{{2E}}\left( {2 + v} \right)\) |
| Answer» B. \(\frac{{{\tau ^2}}}{{2E}}\left( {1 + v} \right)\) | |
| 4. |
Define strain energy. |
| A. | It refers to external work done on a bar. |
| B. | It refers to change in length of a bar. |
| C. | It is the potential energy stored by an elastic body when deformed. |
| D. | It is the energy released by a bar during loading process. |
| Answer» D. It is the energy released by a bar during loading process. | |
| 5. |
Maximum energy that a given component can absorb without undergoing any permanent deformation upto elastic limit is known as: |
| A. | Proof Resilience |
| B. | Resilience |
| C. | Hardness |
| D. | Toughness |
| Answer» B. Resilience | |
| 6. |
A cantilever beam, 2 m in length is subjected to a uniformly distributed load of 10 kN/m. If E = 200 GPa and I = 1000 cm4, the strain energy stored in the beam will be |
| A. | 7 Nm |
| B. | 12 Nm |
| C. | 8 Nm |
| D. | 40 Nm |
| Answer» E. | |
| 7. |
A circular silicon carbide rod exhibiting an elastic modulus of 450 GPa is under uniaxial stress of 450 MPa. The strain energy density stored in this specimen is |
| A. | 225 Nmm/mm3 |
| B. | 0.225 Nmm/mm3 |
| C. | 2.25 Nmm/mm3 |
| D. | 22.5 Nmm/mm3 |
| E. | 255 Nmm/mm3 |
| Answer» C. 2.25 Nmm/mm3 | |
| 8. |
In a material the principal stress are 60 MN/m2, 48 MN/m2 and -36 MN/m2. When the values of E = 200 GN/m2and \(\frac{1}{m} = 0.3\), the total strain energy per unit volume will be nearly |
| A. | 43.5 kNm/m3 |
| B. | 35.5 kNm/m3 |
| C. | 27.5 kNm/m3 |
| D. | 19.5 kNm/m3 |
| Answer» E. | |
| 9. |
A rod of 40 mm diameter, 5 m long is stressed with 47.476 N/mm2 is subjected to a gradual tensile load. Strain energy absorbed by the rod is equal to _______ N-m. Given modulus of elasticity of the material of the bar as 2 × 105 N/mm2. |
| A. | 35.81 |
| B. | 19.76 |
| C. | 12.9 |
| D. | 55.43 |
| Answer» B. 19.76 | |
| 10. |
An object deformed by applying force. Energy stored in the material during deformation is known as: |
| A. | elastic energy |
| B. | potential energy |
| C. | strain energy |
| D. | plastic energy |
| Answer» D. plastic energy | |
| 11. |
A mild steel specimen is under Uni-axial tensile stress. Strain energy per unit volume of mild steel specimen is ________, if Young's modulus and yield stress for mild steel are 2 × 105 MPa and 150 Mpa respectively. |
| A. | 56.2 N / mm2 |
| B. | 0.0562 N / mm2 |
| C. | 0.562 N / mm2 |
| D. | 5.62 N / mm2 |
| Answer» C. 0.562 N / mm2 | |
| 12. |
If a gradual tensile load (P) is applied to an elastic bar axially, the change in the length of bar is x. What will be the strain energy in the material of the bar ? |
| A. | Px |
| B. | \(\frac{Px}{2}\) |
| C. | 2Px |
| D. | zero |
| Answer» C. 2Px | |
| 13. |
A tensile force P Newton is applied gradually on a prismatic bar of length L m and areas of cross-section A m2. The strain energy stored in the bar will be equal to |
| A. | (PL/AE) |
| B. | (PL2/AE) |
| C. | P2L/2AE) |
| D. | (P2L/AE) |
| Answer» D. (P2L/AE) | |
| 14. |
Proof resilience is the property of the materials which indicates their capacity to bear |
| A. | Shocks |
| B. | Static compressive loads |
| C. | Static tensile loads |
| D. | None of these |
| Answer» B. Static compressive loads | |
| 15. |
A beam carries a uniformly distributed load throughout its length. In which of the following configurations, will the strain energy be maximum - |
| A. | Cantilever |
| B. | Fixed beam |
| C. | Simply supported beam |
| D. | Propped cantilever |
| Answer» B. Fixed beam | |
| 16. |
Enthalpy change of vaporization can be increased if |
| A. | number of protons are reduced |
| B. | isotopes are introduced |
| C. | catalysts or speed regulators are added |
| D. | number of electrons are added |
| Answer» E. | |
| 17. |
Weak electrostatic forces of attraction in ionic lattice is due to |
| A. | lower charge density |
| B. | higher charge density |
| C. | neutral charge density |
| D. | charge cancellation |
| Answer» B. higher charge density | |
| 18. |
In the enthalpy profile diagram, the reactants and products are represented on |
| A. | z-axis |
| B. | x-axis |
| C. | y-axis |
| D. | none of above |
| Answer» D. none of above | |
| 19. |
Lithium Fluoride's lattice energy to Magnesium oxide is |
| A. | lesser |
| B. | greater |
| C. | same |
| D. | never known |
| Answer» B. greater | |
| 20. |
For experiments to be carried out in a calorimeter, one should have known the amounts of |
| A. | volume of liquids |
| B. | density of liquids |
| C. | viscosity of liquid |
| D. | mass of liquids |
| Answer» B. density of liquids | |
| 21. |
Light weight batteries which produce high voltage are |
| A. | nickel cadmium cells |
| B. | aluminum air batteries |
| C. | lead(II) sulfate batteries |
| D. | lead(II) oxide batteries |
| Answer» C. lead(II) sulfate batteries | |
| 22. |
The ideal temperature for calorimetry is |
| A. | 0.1 °C only |
| B. | 0.2 °C only |
| C. | 0.9 °C |
| D. | 0.1 °C and 0.2 °C |
| Answer» E. | |
| 23. |
The value of lattice energy is affected by |
| A. | size of ions only |
| B. | charge of ions only |
| C. | mass of ions |
| D. | size and charge of ions |
| Answer» E. | |
| 24. |
The energy which is required to elevate the temperature of 1g of liquid by 1 °C is called |
| A. | ideal heat capacity |
| B. | specific heat capacity |
| C. | latent heat capacity |
| D. | specific latent heat capacity |
| Answer» C. latent heat capacity | |
| 25. |
In order to increase the Van der Waal's forces, |
| A. | contact points shall be minimized |
| B. | contact points shall be made extinct |
| C. | number of electrons shall be increased |
| D. | number of protons shall be reduced |
| Answer» D. number of protons shall be reduced | |
| 26. |
Half reaction occur in fuel cell of |
| A. | oxygen |
| B. | hydrogen |
| C. | hydrogen -oxygen |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 27. |
Polystyrene drinking cup can act like the apparatus of |
| A. | calorimeter |
| B. | spectrometer |
| C. | barometer |
| D. | manometer |
| Answer» B. spectrometer | |
| 28. |
With the increase in the size of ion, will make lattice energy |
| A. | less exothermic |
| B. | more exothermic |
| C. | stable |
| D. | constant |
| Answer» B. more exothermic | |
| 29. |
An increase in the number of electrons increases the |
| A. | Van der Waal's forces |
| B. | enthalpy change of vaporization |
| C. | boiling points of noble gases |
| D. | melting point of Nobel gases |
| Answer» C. boiling points of noble gases | |
| 30. |
The technique which we use to measure enthalpy change of reactions is known as |
| A. | spectrometry |
| B. | calorimetry |
| C. | stoichiometry |
| D. | geoalgometry |
| Answer» C. stoichiometry | |
| 31. |
The ordinary dry cells are used in |
| A. | toys only |
| B. | torches only |
| C. | car |
| D. | toys and torches |
| Answer» E. | |
| 32. |
By passing the electricity through electrochemical cells, they can be |
| A. | recharged |
| B. | charged |
| C. | discharged |
| D. | deployed |
| Answer» B. charged | |
| 33. |
Benefits of using small cells could be |
| A. | lightweight |
| B. | high voltage |
| C. | constant voltage |
| D. | all of above |
| Answer» E. | |
| 34. |
Reaction of Carbon(s) with O₂(g) is an example of |
| A. | combustion |
| B. | Thermal decomposition |
| C. | Neutralization |
| D. | Respiration |
| Answer» B. Thermal decomposition | |
| 35. |
The estimated range of voltage of ordinary dry cells is |
| A. | 1.5-5V |
| B. | 1.2-5V |
| C. | 1.5-2V |
| D. | 2V |
| Answer» D. 2V | |
| 36. |
Conversion of solid Ammonium Nitrate (NH₄NO₃(s)) into aqueous Ammonium Nitrate (NH₄NO₃(aq)) is an example of |
| A. | combustion |
| B. | Thermal decomposition |
| C. | Neutralization |
| D. | dissolving |
| Answer» E. | |
| 37. |
Overall energy change can be calculated by |
| A. | subtracting the energy taken in when bonds are broken from the energy given out, when bonds are made |
| B. | adding the energy taken in when bonds are broken and the energy given out, when bonds are made |
| C. | subtracting the energy given out when bonds are made from the energy taken in, when bonds are broken |
| D. | multiplying all the enthalpy changes |
| Answer» B. adding the energy taken in when bonds are broken and the energy given out, when bonds are made | |
| 38. |
Energy can be conserved through |
| A. | insulating lofts with fiber glass |
| B. | use of lame burn engines |
| C. | using catalytic converters |
| D. | controlling temperature |
| Answer» B. use of lame burn engines | |
| 39. |
CHP stands for |
| A. | Compressed hydrogenated petrol |
| B. | combustible halogenated propane |
| C. | combined heat and power |
| D. | controlled hallucinating pressures |
| Answer» D. controlled hallucinating pressures | |
| 40. |
Exothermic compounds are |
| A. | highly volatile |
| B. | rarely stable |
| C. | very stable |
| D. | can be decomposed into their elements |
| Answer» D. can be decomposed into their elements | |
| 41. |
Endothermic reactions include |
| A. | conversion of sodium nitrate crystal to sodium nitrate solution |
| B. | upon heating, hydrogen results in water |
| C. | neutralization of acids and alkalis |
| D. | respiration |
| Answer» B. upon heating, hydrogen results in water | |
| 42. |
Purpose of Lean Burn engines is to |
| A. | produce less air pollution |
| B. | consume lesser oxygen |
| C. | produce more efficient fuel combustion |
| D. | use them in sky rockets |
| Answer» D. use them in sky rockets | |
| 43. |
Endothermic changes are indicated through |
| A. | breaking of chemical bonds |
| B. | making of chemical bond |
| C. | burning of carbon |
| D. | all of the above |
| Answer» B. making of chemical bond | |
| 44. |
Exothermic reactions take place when |
| A. | energy given out in making bonds is less than the energy taken in for breaking bonds |
| B. | energy given out in making bonds is more than the energy taken in for breaking bonds |
| C. | energy given out in making bonds is equal to the energy taken in for breaking bonds |
| D. | the final energy content of products is lower |
| Answer» C. energy given out in making bonds is equal to the energy taken in for breaking bonds | |
| 45. |
On burning, hydrogen is changed into |
| A. | hydroxides |
| B. | water vapors |
| C. | dilute acids |
| D. | hydrogen gas |
| Answer» C. dilute acids | |
| 46. |
Incorrect statement is: An exothermic reaction, |
| A. | forms a compound which gives out heat while being formed |
| B. | contains products that are very stable |
| C. | resulting in overall enthalpy change zero |
| D. | gives overall negative enthalpy. |
| Answer» C. resulting in overall enthalpy change zero | |
| 47. |
Temporary dipole-induced dipole forces are also called as |
| A. | Van der Waal's forces |
| B. | electrovalent forces |
| C. | electromagnetic forces |
| D. | electric forces |
| Answer» B. electrovalent forces | |
| 48. |
Methane (CH₄) is an excellent fuel because |
| A. | it is basically an endothermic reaction |
| B. | it gives off a lot of heat |
| C. | it produces carbon monoxide |
| D. | it contains a lot of carbon |
| Answer» C. it produces carbon monoxide | |
| 49. |
The advantage of fuel cell over petrol is its only product |
| A. | oxygen |
| B. | water |
| C. | nitrogen |
| D. | CO₂ |
| Answer» C. nitrogen | |
| 50. |
Noble gases can be liquefied at |
| A. | low temperatures |
| B. | high temperatures |
| C. | low pressures |
| D. | high bond energies |
| Answer» B. high temperatures | |