MCQOPTIONS
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MCQOPTIONS
This section includes 332 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
Chemically, mullite refractories is________________? |
| A. | 3Al2O3.2SiO2 |
| B. | Al2O3 |
| C. | ZrSO4 |
| D. | ThO2 |
| Answer» B. Al2O3 | |
| 252. |
_________________ chart is a graph related to Antoine equation ? |
| A. | Ostwald |
| B. | Cox |
| C. | Mollier’s |
| D. | Enthalpy-concentration |
| Answer» C. Mollier’s | |
| 253. |
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________? |
| A. | Fireclay |
| B. | Silicon carbide |
| C. | Corundum |
| D. | Siliceous fireclay |
| Answer» C. Corundum | |
| 254. |
Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called_________________? |
| A. | Spalling resistance |
| B. | Refractoriness |
| C. | Refractoriness under load (RUL) |
| D. | None of these |
| Answer» B. Refractoriness | |
| 255. |
Boiling point of a solution as compared to that of the corresponding solvent is _________________? |
| A. | Less |
| B. | Less |
| C. | Same |
| D. | Either more or less; depends upon the solvent |
| Answer» C. Same | |
| 256. |
Boiling point of a non-homogeneous mixture of immiscible liquids is _____________ that of any one of its separate components? |
| A. | Lower than |
| B. | Higher than |
| C. | Equal to |
| D. | Either A. or B.; depends on the liquids |
| Answer» B. Higher than | |
| 257. |
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except______________? |
| A. | Cost |
| B. | Electrical conductivity |
| C. | Thermal conductivity |
| D. | Fusion point |
| Answer» B. Electrical conductivity | |
| 258. |
Avogadro’s number is equal to__________________? |
| A. | 6.023 × 1023 molecules/kg.mole |
| B. | 6.023 × 1023 molecules/gm.mole |
| C. | 6.023 × 1016 molecules/kg.mole |
| D. | 6.023 × 1026 molecules/gm.mole |
| Answer» C. 6.023 × 1016 molecules/kg.mole | |
| 259. |
Avogadro number is the number of molecules in one ____________ of a gas? |
| A. | gram |
| B. | Kilogram |
| C. | gm.mole |
| D. | Litre |
| Answer» D. Litre | |
| 260. |
Average molecular weight of air is about ____________________? |
| A. | 21 |
| B. | 29 |
| C. | 23 |
| D. | 79 |
| Answer» C. 23 | |
| 261. |
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 | |
| 262. |
Atomic ______________ of an element is a whole number? |
| A. | Weight |
| B. | Number |
| C. | Volume |
| D. | Radius |
| Answer» C. Volume | |
| 263. |
Atmospheric pressure corresponds to a hydrostatic head of_________________? |
| A. | 13.6 cms of Hg |
| B. | 34 ft ofH2O |
| C. | 1 metre of H2O |
| D. | 13.6 metres of Hg |
| Answer» C. 1 metre of H2O | |
| 264. |
At standard conditions, N2 + 2O2 ⇌ 2NO2; ΔG° = 100 kJ/mole NO + ½O2 ⇌ 2NO2; ΔG° = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________? |
| A. | 15 |
| B. | 30 |
| C. | 85 |
| D. | 170 |
| Answer» D. 170 | |
| 265. |
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 | |
| 266. |
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) _______________ with increase in temperature? |
| A. | Varies linearly |
| B. | Increases |
| C. | Decreases |
| D. | Does not vary |
| Answer» C. Decreases | |
| 267. |
At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases linearly |
| Answer» B. Decreases | |
| 268. |
At a temperature of 0°K, the molecules of a gas have only _______________ energy? |
| A. | Rotational |
| B. | Vibrational |
| C. | Translational |
| D. | None of these |
| Answer» D. None of these | |
| 269. |
At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________? |
| A. | Decrease in mean free path |
| B. | Increased collision rate among molecules |
| C. | Increase in molecular attraction |
| D. | Increase in average molecular speed |
| Answer» D. Increase in average molecular speed | |
| 270. |
At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be_________________? |
| A. | Significantly less than 4.69 atm |
| B. | Nearly equal to 4.69 atm |
| C. | Significantly more than 4.69 atm |
| D. | Indeterminate due to lack of data |
| Answer» D. Indeterminate due to lack of data | |
| 271. |
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 | |
| 272. |
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________? |
| A. | Nature of the liquid |
| B. | Nature of the gas |
| C. | Temperature of the liquid |
| D. | Total pressure |
| Answer» C. Temperature of the liquid | |
| 273. |
Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is__________________? |
| A. | 80.1°C |
| B. | Less than 80.1°C |
| C. | 100°C |
| D. | Greater than 80.1°C but less than 100°C |
| Answer» E. | |
| 274. |
As per Kirchhoff s equation, the heat of reaction is affected by the__________________? |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | Molecularity |
| Answer» D. Molecularity | |
| 275. |
Applicability of Clausius-Clapeyron Equation is subject to the condition that the __________________? |
| A. | Vapor follows ideal gas law |
| B. | Volume in the liquid state is negligible |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 276. |
°API gravity of water at N.T.P. is about__________________? |
| A. | 0 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» D. 100 | |
| 277. |
An ideal gas can be liquefied, because ___________________? |
| A. | Its molecular size is very small |
| B. | Its critical temperature is more than 0°C |
| C. | Forces operative between its molecules are negligible |
| D. | It gets solidified directly without becoming liquid |
| Answer» D. It gets solidified directly without becoming liquid | |
| 278. |
An equation for calculating vapour pressure is given by, log10 P = A – B(t + c). This is called the________________? |
| A. | Kistyakowsky equation |
| B. | Antoine equation |
| C. | Kopp’s rule |
| D. | Trouton’s rule |
| Answer» C. Kopp’s rule | |
| 279. |
An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________? |
| A. | Is saturated |
| B. | Is unsaturated |
| C. | Shows negative deviation from Raoult’s law |
| D. | Shows positive deviation from Raoult’s law |
| Answer» E. | |
| 280. |
An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________? |
| A. | 0.2500 |
| B. | 0.2528 |
| C. | 0.5000 |
| D. | 0.5055 |
| Answer» E. | |
| 281. |
Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg? |
| A. | 80.38 |
| B. | 80 |
| C. | 79.62 |
| D. | 78.51 |
| Answer» D. 78.51 | |
| 282. |
Addition of zircon to silica refractory brick improves its_________________? |
| A. | Crushing strength |
| B. | Resistance to slag attack |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» C. Both A. and B. | |
| 283. |
Addition of a non-volatile solute to a solvent produces a ______________ in its solvent? |
| A. | Freezing point elevation |
| B. | Boiling point depression |
| C. | Vapor pressure lowering |
| D. | All A., B. & C. |
| Answer» D. All A., B. & C. | |
| 284. |
Addition of a non-volatile solute to a pure solvent ____________________? |
| A. | Increases its freezing point |
| B. | Increases its boiling point |
| C. | Decreases its freezing point |
| D. | Both B. and C. |
| Answer» E. | |
| 285. |
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ? |
| A. | log (1/H+) |
| B. | – log (1/H+) |
| C. | 1/log H+ |
| D. | None of these |
| Answer» B. – log (1/H+) | |
| 286. |
According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________? |
| A. | T |
| B. | T0.5 |
| C. | T1.5 |
| D. | T2 |
| Answer» C. T1.5 | |
| 287. |
According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition? |
| A. | No component is concentrated at the surface of the solution |
| B. | The component molecules are non polar and are of almost equal size |
| C. | In the formation of solution, chemical combination/molecular association between unlike molecules takes place |
| D. | The attractive forces between like and unlike molecules are almost equal |
| Answer» D. The attractive forces between like and unlike molecules are almost equal | |
| 288. |
A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ? |
| A. | 17 |
| B. | 20 |
| C. | 25 |
| D. | 34 |
| Answer» B. 20 | |
| 289. |
A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________? |
| A. | x1/x2 |
| B. | x2/x1 |
| C. | 1 – (x1/x2) |
| D. | 1/x2 |
| Answer» B. x2/x1 | |
| 290. |
A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor? |
| A. | Saturated |
| B. | Superheated |
| C. | Unsaturated |
| D. | Dry gaseous |
| Answer» C. Unsaturated | |
| 291. |
A vapor whose partial pressure is less than its equilibrium vapor pressure is called a ______________ vapor? |
| A. | Saturated |
| B. | Supersaturated |
| C. | Superheated |
| D. | None of these |
| Answer» D. None of these | |
| 292. |
A vapor that exists above its critical temperature is termed as a _____________ vapor? |
| A. | Saturated |
| B. | Unsaturated |
| C. | Gaseous |
| D. | Sub-cooled |
| Answer» D. Sub-cooled | |
| 293. |
A sugar solution containing _________________ percent sugar is equivalent to 1 Brix? |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» D. 10 | |
| 294. |
A solution with reasonably permanent pH is called a/an _______________ solution? |
| A. | Ideal |
| B. | Non-ideal |
| C. | Buffer |
| D. | Colloidal |
| Answer» D. Colloidal | |
| 295. |
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. | 0.05 |
| Answer» D. 0.05 | |
| 296. |
A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________? |
| A. | 3 |
| B. | 100 |
| C. | 1000 |
| D. | None of these |
| Answer» D. None of these | |
| 297. |
A saturated vapor on being compressed would___________________? |
| A. | Condense |
| B. | Form wet steam |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 298. |
A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ? |
| A. | 350 |
| B. | 485 |
| C. | 140 |
| D. | 345 |
| Answer» B. 485 | |
| 299. |
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________? |
| A. | 13728 J |
| B. | 19206 J |
| C. | 4576 J |
| D. | 12712 J |
| Answer» C. 4576 J | |
| 300. |
A reduction process is accompanied with increase in the_______________? |
| A. | Number of electrons |
| B. | Oxidation number |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» B. Oxidation number | |