MCQOPTIONS
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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.
| 3251. |
Which of the following processes can not be made reversible even under ideal condition of operation? |
| A. | Free expansion of a gas. |
| B. | Compression of air in a compressor. |
| C. | Expansion of steam in a turbine. |
| D. | all (a), (b) & (c). |
| Answer» B. Compression of air in a compressor. | |
| 3252. |
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation. |
| A. | Gibbs-Duhem |
| B. | Van Laar |
| C. | Gibbs-Helmholtz |
| D. | Margules |
| Answer» B. Van Laar | |
| 3253. |
In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process. |
| A. | isothermal |
| B. | isobaric |
| C. | polytropic |
| D. | adiabatic |
| Answer» B. isobaric | |
| 3254. |
For the gaseous phase chemical reaction, C2H4(g) + H2O(g) C2H5OH(g), the equilibrium conversion does not depend on the |
| A. | steam to ethylene ratio. |
| B. | temperature. |
| C. | pressure. |
| D. | none of these. |
| Answer» E. | |
| 3255. |
The first law of thermodynamics is a statement of conservation of |
| A. | heat |
| B. | momentum |
| C. | energy |
| D. | work |
| Answer» D. work | |
| 3256. |
Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.). |
| A. | entropy |
| B. | internal energy |
| C. | enthalpy |
| D. | Gibbs free energy |
| Answer» E. | |
| 3257. |
Heat of formation of an element in its standard state is |
| A. | 0 |
| B. | < 0 |
| C. | > 0 |
| D. | a function of pressure |
| Answer» B. < 0 | |
| 3258. |
The equation relating E, P, V and T which is true for all substanes under all conditions is given by .This equation is called the |
| A. | Maxwell's equation. |
| B. | thermodynamic equation of state. |
| C. | equation of state. |
| D. | Redlich-Kwong equation of state. |
| Answer» C. equation of state. | |
| 3259. |
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is |
| A. | same in both the phases. |
| B. | zero in both the phases. |
| C. | more in vapour phase. |
| D. | more in liquid phase. |
| Answer» B. zero in both the phases. | |
| 3260. |
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about |
| A. | 0.5 |
| B. | 3.5 |
| C. | 4.5 |
| D. | 8.5 |
| Answer» C. 4.5 | |
| 3261. |
The number of degrees of freedom for a mixture of ice and water (liquid) are |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 3262. |
Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the |
| A. | calorific value |
| B. | heat of reaction |
| C. | heat of combustion |
| D. | heat of formation |
| Answer» D. heat of formation | |
| 3263. |
Clausius - Clayperon equation is applicable to __________ equilibrium processes. |
| A. | solid-vapor |
| B. | solid-liquid |
| C. | liquid-vapor |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 3264. |
After throttling, gas temperature |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | may increase or decrease ; depends on the nature of the gas |
| Answer» B. increases | |
| 3265. |
The chemical potential for a pure substance is __________ its partial molal free energy. |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | not related to |
| Answer» D. not related to | |
| 3266. |
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | increase in summer and will decrease in winter |
| Answer» B. decrease | |
| 3267. |
Domestic refrigerator usually works on the __________ refrigeration cycle. |
| A. | Carnot |
| B. | air |
| C. | absorption |
| D. | vapour-ejection |
| Answer» D. vapour-ejection | |
| 3268. |
A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor. |
| A. | isolated |
| B. | closed |
| C. | open |
| D. | none of these |
| Answer» D. none of these | |
| 3269. |
For an ideal gas, the chemical potential is given by |
| A. | <i>RT dlnP </i> |
| B. | <i>R dlnP </i> |
| C. | <i>R dlnf</i> |
| D. | none of these |
| Answer» B. <i>R dlnP </i> | |
| 3270. |
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be |
| A. | same |
| B. | doubled |
| C. | halved |
| D. | one fourth of its original value |
| Answer» B. doubled | |
| 3271. |
In the ammonia synthesis reaction, N2 + 3H2 2NH3 + 22.4 kcal, the formation of NH3 will be favoured by |
| A. | high temperature. |
| B. | low pressure. |
| C. | low temperature only. |
| D. | both low temperature and high pressure. |
| Answer» E. | |
| 3272. |
Third law of thermodynamics is helpful in |
| A. | prediction of the extent of a chemical reaction. |
| B. | calculating absolute entropies of substances at different temperature. |
| C. | evaluating entropy changes of chemical reaction. |
| D. | both (b) and (c) |
| Answer» E. | |
| 3273. |
Fugacity and pressure are numerically equal, when the gas is |
| A. | in standard state |
| B. | at high pressure |
| C. | at low temperature |
| D. | in ideal state |
| Answer» E. | |
| 3274. |
Solid and liquid phases of a substance are in equilibrium at the |
| A. | critical temperature |
| B. | melting point. |
| C. | freezing point. |
| D. | both (b) and (c). |
| Answer» E. | |
| 3275. |
Absolute zero temperature signifies the |
| A. | minimum temperature attainable. |
| B. | temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in. |
| C. | temperature of the heat reservoir to which a Carnot engine rejects no heat. |
| D. | none of these. |
| Answer» D. none of these. | |
| 3276. |
1 kgf/cm2 is not equal to |
| A. | 1 torr |
| B. | 1 bar |
| C. | 10000 mm wc |
| D. | 100 KPa = 100 000 N/m |
| E. | <sup>2</sup> |
| Answer» B. 1 bar | |
| 3277. |
On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes |
| A. | 1 |
| B. | 8 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 3278. |
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour |
| A. | measures the elevation in boiling point. |
| B. | is not dependent on the temperature. |
| C. | is a function of the liquid phase composition. |
| D. | measures the depression in freezing point. |
| Answer» D. measures the depression in freezing point. | |
| 3279. |
Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the |
| A. | temperature. |
| B. | volume of solution. |
| C. | moles of non-volatile solute. |
| D. | none of these. |
| Answer» B. volume of solution. | |
| 3280. |
Which of the following is an exothermic reaction ? |
| A. | Conversion of graphite to diamond |
| B. | Decomposition of water |
| C. | Dehydrogenation of ethane to ethylene |
| D. | none of these |
| Answer» E. | |
| 3281. |
Heat of solution in a system in which both solute and solvent are liquids is termed as |
| A. | heat of solvation. |
| B. | heat of hydration. |
| C. | standard integral heat of solution. |
| D. | heat of mixing. |
| Answer» E. | |
| 3282. |
Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | first fall and then rise. |
| Answer» B. decrease | |
| 3283. |
A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 3284. |
Average molecular weight of air is about |
| A. | 21 |
| B. | 29 |
| C. | 23 |
| D. | 79 |
| Answer» C. 23 | |
| 3285. |
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm. |
| A. | 0.5 |
| B. | 1 |
| C. | 3 |
| D. | 5 |
| Answer» B. 1 | |
| 3286. |
Increasing the temperature of an aqueous solution will cause decrease in its |
| A. | molality |
| B. | mole fraction |
| C. | weight percent |
| D. | molarity |
| Answer» E. | |
| 3287. |
S.T.P. corresponds to |
| A. | 1 atm. absolute pressure & 15.5 C. |
| B. | 760 mm Hg gauge pressure & 15.5 C. |
| C. | 760 torr & 0 C. |
| D. | 101.325 kPa gauge pressure & 15.5 C. |
| Answer» B. 760 mm Hg gauge pressure & 15.5 C. | |
| 3288. |
With rise in pressure, the solubility of gases in solvent, at a fixed temperature |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | decreases linearly |
| Answer» B. decreases | |
| 3289. |
Vapor pressure of water at 100 C is about __________ bar. |
| A. | 0.1013 |
| B. | 1.013 |
| C. | 10.13 |
| D. | 101.3 |
| Answer» C. 10.13 | |
| 3290. |
At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 12 |
| Answer» C. 10 | |
| 3291. |
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the |
| A. | same elevation in boiling point. |
| B. | different elevation in boiling point. |
| C. | elevation in boiling point in the ratio of their molecular weights. |
| D. | none of these. |
| Answer» B. different elevation in boiling point. | |
| 3292. |
N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60) |
| A. | 80% |
| B. | 90% |
| C. | 95% |
| D. | 98% |
| Answer» C. 95% | |
| 3293. |
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5 C). |
| A. | API = 200(G - 1) |
| B. | API = (141.5/G) - 131.5 |
| C. | API = (140/G) - 130 |
| D. | API = 145 - (145/G) |
| Answer» C. API = (140/G) - 130 | |
| 3294. |
Which of the following is not a colligative property ? |
| A. | Osmotic pressure |
| B. | Depression of freezing point |
| C. | Lowering of vapor pressure |
| D. | none of these. |
| Answer» E. | |
| 3295. |
Atoms of the same element, but of different masses are called |
| A. | isobars |
| B. | isotones |
| C. | isotopes |
| D. | none of these |
| Answer» D. none of these | |
| 3296. |
If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is __________ times. |
| A. | 10 |
| B. | 100 |
| C. | 1000 |
| D. | 10000 |
| Answer» D. 10000 | |
| 3297. |
Kopp's rule is concerned with the calculation of |
| A. | thermal conductivity. |
| B. | heat capacity. |
| C. | viscosity. |
| D. | surface tension. |
| Answer» C. viscosity. | |
| 3298. |
Density of carbon dioxide is __________ kg/Nm3. |
| A. | 44/22400 |
| B. | 44/22.4 |
| C. | 22.4/44 |
| D. | none of these |
| Answer» C. 22.4/44 | |
| 3299. |
Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263 C and 2 atm. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 3300. |
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500 C to - 100 C is |
| A. | 10.73 kJ |
| B. | 16.15 kJ |
| C. | 18.11 kJ |
| D. | 18.33 kJ |
| Answer» D. 18.33 kJ | |