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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Fugacity is a measure of the |
| A. | escaping tendencies of the same substance in different phases of a system. |
| B. | relative volatility of a mixture of two miscible liquids. |
| C. | behaviour of ideal gases. |
| D. | none of these. |
| Answer» B. relative volatility of a mixture of two miscible liquids. | |
| 1752. |
The quantitative effect of temperature on chemical equilibrium is given by the |
| A. | Vant-Hoff equation. |
| B. | Le-Chatelier's principle. |
| C. | Arhenius equation. |
| D. | none of these. |
| Answer» B. Le-Chatelier's principle. | |
| 1753. |
Generation of heat by friction is an example of a/an __________ change. |
| A. | isothermal |
| B. | irreversible |
| C. | adiabatic |
| D. | reversible |
| Answer» C. adiabatic | |
| 1754. |
A domestic refrigerator has a/an __________ cooled condenser. |
| A. | water |
| B. | air |
| C. | evaporative |
| D. | gas |
| Answer» C. evaporative | |
| 1755. |
As the temperature is lowered towards the absolute zero, the value of, then approaches |
| A. | unity |
| B. | zero |
| C. | that of the heat of reaction |
| D. | infinity |
| Answer» C. that of the heat of reaction | |
| 1756. |
The extensive properties are |
| A. | volume, mass and number of moles. |
| B. | free energy, entropy and enthalpy. |
| C. | both (a) and (b). |
| D. | none of these. |
| Answer» D. none of these. | |
| 1757. |
If we increase the pressure on a substance (which is at its triple point), then the triple point |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | may increase or decrease ; depends on the substance |
| Answer» D. may increase or decrease ; depends on the substance | |
| 1758. |
The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by |
| A. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-414-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-414-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-414-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-414-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/chemical-engineering-thermodynamics/420-414-3.png"> | |
| 1759. |
Which of the following is not affected by temperature changes ? |
| A. | Fugacity |
| B. | Activity co-efficient |
| C. | Free energy |
| D. | None of these |
| Answer» E. | |
| 1760. |
For an ideal gas, the activity co-efficient is |
| A. | directly proportional to pressure. |
| B. | inversely proportional to pressure. |
| C. | unity at all pressures. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1761. |
Those solutions in which there is no volume change upon mixing the components in the liquid state and which, when diluted do not undergo any heat change (i.e. heat of dilution is zero), are called __________ solutions. |
| A. | ideal |
| B. | real |
| C. | isotonic |
| D. | none of these |
| Answer» B. real | |
| 1762. |
Which of the following liquid metals has the highest thermal conductivity ? |
| A. | Molten sodium |
| B. | Molten lead |
| C. | Mercury |
| D. | Molten potassium |
| Answer» B. Molten lead | |
| 1763. |
Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a __________ vapour. |
| A. | superheated |
| B. | desuperheated |
| C. | non-condensable |
| D. | none of these |
| Answer» B. desuperheated | |
| 1764. |
The kinetic energy of gas molecule is zero at |
| A. | 0 C |
| B. | 273 C |
| C. | 100 C |
| D. | -273 C |
| Answer» E. | |
| 1765. |
The necessary and sufficient condition for equilibrium between two phases is |
| A. | the concentration of each component should be same in the two phases. |
| B. | the temperature of each phase should be same. |
| C. | the pressure should be same in the two phases. |
| D. | the chemical potential of each component should be same in the two phases. |
| Answer» E. | |
| 1766. |
Free energy change of mixing two liquid substances is a function of the |
| A. | concentration of the constituents only. |
| B. | quantities of the constituents only. |
| C. | temperature only. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1767. |
The total change in the enthalpy of a system is independent of the |
| A. | number of intermediate chemical reactions involved. |
| B. | pressure and temperature. |
| C. | state of combination and aggregation in the beginning and at the end of the reaction. |
| D. | none of these. |
| Answer» B. pressure and temperature. | |
| 1768. |
Number of phases in a colloidal system are |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 1769. |
Which of the following has the least thermal efficiency ? |
| A. | Steam engine |
| B. | Carnot engine |
| C. | Diesel engine |
| D. | Otto engine |
| Answer» B. Carnot engine | |
| 1770. |
If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the |
| A. | process must be isobaric. |
| B. | temperature must decrease. |
| C. | process must be adiabatic. |
| D. | both (b) and (c). |
| Answer» E. | |
| 1771. |
Joule-Thomson Co-efficient at any point on the inversion curve is |
| A. | |
| B. | + ve |
| C. | 0 |
| D. | -ve |
| Answer» D. -ve | |
| 1772. |
During a reversible isothermal expansion of an ideal gas, the entropy change is |
| A. | +ve |
| B. | 0 |
| C. | -ve |
| D. | |
| Answer» B. 0 | |
| 1773. |
The value of Cp & Cv respectively for monoatomic gases in Kcal/kg Mole . K are |
| A. | 5 & 3 |
| B. | 3.987 & 1.987 |
| C. | 1.987 & 0.66 |
| D. | 0.66 & 1.987 |
| Answer» B. 3.987 & 1.987 | |
| 1774. |
In case of a close thermodynamic system, there is __________ across the boundaries. |
| A. | no heat and mass transfer |
| B. | no mass transfer but heat transfer |
| C. | mass and energy transfer |
| D. | none of these |
| Answer» C. mass and energy transfer | |
| 1775. |
Ideal refrigeration cycle is |
| A. | same as Carnot cycle. |
| B. | same as reverse Carnot cycle. |
| C. | dependent on the refrigerant's properties. |
| D. | the least efficient of all refrigeration processes. |
| Answer» C. dependent on the refrigerant's properties. | |
| 1776. |
The following heat engine produces power of 100000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is |
| A. | 100, 000 kW |
| B. | 160, 000 kW |
| C. | 200, 000 kW |
| D. | 320, 000 kW |
| Answer» E. | |
| 1777. |
Refrigeration cycle |
| A. | violates second law of thermodynamics. |
| B. | involves transfer of heat from low temperature to high temperature. |
| C. | both (a) and (b). |
| D. | neither (a) nor (b). |
| Answer» C. both (a) and (b). | |
| 1778. |
The enthalpy change when ammonia gas is dissolved in water is called the heat of |
| A. | solution |
| B. | formation |
| C. | dilution |
| D. | combustion |
| Answer» B. formation | |
| 1779. |
All gases above its inversion temperature, in a throttling process will show |
| A. | a heating effect. |
| B. | no change in temperature. |
| C. | a cooling effect. |
| D. | either (a) or (c). |
| Answer» B. no change in temperature. | |
| 1780. |
Near their critical temperatures, all gases occupy volumes __________ that of the ideal gas. |
| A. | less than |
| B. | same as |
| C. | more than |
| D. | half |
| Answer» B. same as | |
| 1781. |
Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ____with the increase of reduced temperature. |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | decreases logarithmically |
| Answer» C. remains constant | |
| 1782. |
What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ? |
| A. | 2 |
| B. | 0 |
| C. | 3 |
| D. | 1 |
| Answer» B. 0 | |
| 1783. |
At normal boiling point, molar entropy of vaporisation is __________ Joule/K .mole. |
| A. | 72 |
| B. | 92 |
| C. | 142 |
| D. | 192 |
| Answer» C. 142 | |
| 1784. |
For an ideal solution, the value of activity co-efficient is |
| A. | 0 |
| B. | 1 |
| C. | < 1 |
| D. | > 1 |
| Answer» C. < 1 | |
| 1785. |
The expression, nCv(T2 - T1), is for the __________ of an ideal gas. |
| A. | work done under adiabatic condition |
| B. | co-efficient of thermal expansion |
| C. | compressibility |
| D. | none of these |
| Answer» B. co-efficient of thermal expansion | |
| 1786. |
__________ law of thermodynamics ascertains the direction of a particular spontaneous process. |
| A. | Zeroth |
| B. | First |
| C. | Second |
| D. | Third |
| Answer» D. Third | |
| 1787. |
Which of the following exemplifies an adiabatic process ? |
| A. | Melting of ice. |
| B. | Condensation of alcohol vapor. |
| C. | Sudden bursting of a cycle tube. |
| D. | Evaporation of water. |
| Answer» D. Evaporation of water. | |
| 1788. |
Entropy, which is a measure of the disorder of a system is |
| A. | independent of pressure. |
| B. | independent of temperature. |
| C. | zero at absolute zero temperature for a perfect crystalline substance. |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 1789. |
Critical temperature is defined as the temperature above which a gas will |
| A. | not liquify (barring exceptions). |
| B. | immediately liquify. |
| C. | never liquify however high the pressure may be. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1790. |
Melting of ice exemplifies a/an |
| A. | adiabatic process. |
| B. | endothermic reaction. |
| C. | exothermic reaction. |
| D. | process involving a chemical reaction. |
| Answer» C. exothermic reaction. | |
| 1791. |
__________ explains the equilibrium constant for any chemical reaction. |
| A. | Henry's law |
| B. | Law of mass action |
| C. | Hess's law |
| D. | none of these |
| Answer» C. Hess's law | |
| 1792. |
A refrigeration cycle is the same as a __________ cycle, |
| A. | turbine |
| B. | heat engine |
| C. | reversed heat engine |
| D. | none of these |
| Answer» D. none of these | |
| 1793. |
At __________ point, all the three phases (i.e.solid, liquid and gas) co-exist. |
| A. | eutcetic |
| B. | triple |
| C. | plait |
| D. | critical |
| Answer» C. plait | |
| 1794. |
Kopp's rule is used to calculate the heat capacity of |
| A. | solids |
| B. | liquids |
| C. | gases |
| D. | all (a), (b) & (c) |
| Answer» B. liquids | |
| 1795. |
The heat capacities for the ideal gas state depend upon the |
| A. | pressure |
| B. | temperature |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 1796. |
Which of the following will increase the volume of a real gas by four times ? |
| A. | Doubling the absolute temperature as well as pressure of the gas. |
| B. | Reducing pressure to one fourth at constant temperature. |
| C. | Reducing temperature to one fourth at constant pressure. |
| D. | Reducing the temperature to half and doubling the pressure. |
| Answer» C. Reducing temperature to one fourth at constant pressure. | |
| 1797. |
The equation, PV = nRT, is best obeyed by gases at |
| A. | low pressure & high temperature. |
| B. | high pressure & low temperature. |
| C. | low pressure & low temperature. |
| D. | none of these. |
| Answer» B. high pressure & low temperature. | |
| 1798. |
Internal energy of an element at 1 atm and 25 C is __________ kcal/kg.mole. |
| A. | 0 |
| B. | 273 |
| C. | 25 |
| D. | none of these |
| Answer» B. 273 | |
| 1799. |
Work done is a |
| A. | property of the system |
| B. | path function |
| C. | point function |
| D. | state description of a system |
| Answer» C. point function | |
| 1800. |
Entropy of the system decreases, when |
| A. | snow melts into water. |
| B. | a gas expands spontaneously from high pressure to low pressure. |
| C. | water is converted into ice. |
| D. | both (b) & (c). |
| Answer» E. | |