Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : Total energy at a point comprises of _____________ energy?

A: Potential & kinetic B: Pressure C: Internal D: All A., B. & C.

Q3 : ‘Giga’ stands for__________________?

A: 109 B: 10-12 C: 1012 D: 1015

Q4 : Pick out the correct statement?

A: If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, B: A process is irreversible as long as Δ S for the system is greater than zero C: The mechanical work done by a system is always equal to∫P.dV D: The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Q5 : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?

A: -1.87 B: 0 C: 1.26 D: 3.91

Q6 : If an ideal solution is formed by mixing two pure liquids in any proportion, then the ___________________ of mixing is zero?

A: Enthalpy B: Volume C: Both A. & B. D: Neither A nor B

Q7 : When a gas in a vessel expands, its internal energy decreases. The process involved is________________?

A: Reversible B: Irreversible C: Isothermal D: Adiabatic

Q8 : The first law of thermodynamics is a restatement of the law of conservation of_________________?

A: Mass B: Energy C: Momentum D: None of these

Q9 : 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

Q10 : Raoult’s law is not applicable to the___________________?

A: Solutes which dissociate or associate in the particular solution B: Concentrated solutions C: Both B. & C. D: Solutions containing non-volatile solute

Q11 : Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is__________________?

A: 2 B: 0 C: 1 D: 3

Q12 : Maximum heat transfer rate can be expected in case of_________?

A: Laminar flow B: Co-current flow C: Turbulent flow D: Heat flow rate is independent of nature of flow

Q13 : pH value of H2SO4 (5% concentration) is__________________?

A: 5 B: 7 C: > 7 D: < 7

Q14 : Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________?

A: T B: T2 C: 1/√T D: T2

Q15 : The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight?

A: Increases B: Decreases C: Remains unchanged D: Either A. or B.; depends on the liquid

Q16 : Atoms of the same element, but of different masses are called__________________?

A: Isobars B: Isotones C: Isotopes D: None of these

Q17 : Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

A: T2/(T1 – T2) B: T1/(T1 – T2) C: (T1 – T2)/T1 D: (T1 – T2)/T2

Q18 : For an ideal gas, the chemical potential is given by______________?

A: RT d ln P B: R d ln P C: R d ln f D: None of these

Q19 : What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

A: TR/(T2 – TR) × (T1 – T2)/T1 B: TR/(T2 – TR) × T1/(T1 – T2) C: TR/(T1 – TR) × (T1 – T2)/T1 D: None of these

Q20 : The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the_______________?

A: Phase rule B: Experimental data C: Empirical equations D: Theoretical equations

Q21 : The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?

A: Increases B: Decreases C: Remains unchanged D: Decreases linearly

Q22 : 1 gm mole of methane (CH4) contains_________________?

A: 6.02 × 1023 atoms of hydrogen B: 4 gm atoms of hydrogen C: 3.01 × 1023 molecules of methane D: 3 gms of carbon

Q23 : How much O2 can be obtained from 90 kg of water ?

A: 32 kg B: 80 kg C: 64 kg D: 90 kg

Q24 : Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?

A: 0 B: ∞ C: 1 D: None of these

Q25 : Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ?

A: RT B: P + (a/V2) C: (V – b) D: 1/RT

Q26 : The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

A: 2M B: M/2 C: M D: M/4

Q27 : Unit of mass velocity is___________________?

A: kg/m.hr B: kg/m2.hr C: kg/hr D: kg/m2

Q28 : Which of the following is not correct for a reversible adiabatic process ?

A: TVγ-1 = constant B: p1-γ.TY = constant C: PVγ = constant D: None of these

Q29 : Change of state namely evaporation condensation, freezing and melting is an _______________ process?

A: Isothermal B: Adiabatic C: Isobaric D: Isochoric

Q30 : Partial molar free energy of an element A in solution is same as its__________________?

A: Chemical potential B: activity C: Fugacity D: Activity co-efficient

Q31 : A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container___________________?

A: Will be greater than 298 K B: Will be 298 K C: Will be less than 298 K D: Cannot be determined

Q32 : 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

Q33 : The value of gas constant ‘R’ is__________________?

A: 1.987 cal/gm mole °K B: 1.987 BTU/lb. mole °R C: Both A. and B D: Neither A. nor B

Q34 : Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________?

A: (∂T/∂V)S, ni = -(∂P/∂S)V, ni B: (∂S/∂P)T, ni = (∂V/∂T)P, ni C: (∂S/∂V)T, ni = (∂P/∂T)V, ni D: (∂T/∂P)S, ni = (∂V/∂S)P, ni

Q35 : One ‘Therm’ is equivalent to___________________?

A: 105 BTU B: 105 kcal C: 109 BTU D: 109 kcal

Q36 : The thermodynamic law, PVy = constant, is not applicable in case of______________?

A: Ideal compression of air B: Free expansion of an ideal gas C: Adiabatic expansion of steam in a turbine D: Adiabatic compression of a perfect gas

Q37 : ______________ equation gives the effect of temperature on heat of reaction ?

A: Kirchoff’s B: Maxwell’s C: Antoine D: Kistyakowsky

Q38 : Which of the following rock favors petroleum formation?

A: Sedimentary rock B: Igneous rock C: Metamorphic rock D: None of these

Q39 : Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?

A: 1.72 B: 0.58 C: 0.5 D: 0.2

Q40 : Free energy change at equilibrium is____________________?

A: Zero B: Positive C: Negative D: Indeterminate

Q41 : A gas shows deviation from ideal behaviour at______________?

A: Low pressure and high temperature B: Low pressure and low temperature C: Low temperature and high pressure D: High temperature and high pressure

Q42 : With increase in the temperature of pure (distilled) water, its____________________?

A: pOH decreases and pH increases B: pOH and pH both decreases C: pH and pOH both increases D: pH decreases and pOH increases

Q43 : The value of gas constant ‘R’ is ______________ kcal/kg.mole.°C?

A: 2.79 B: 1.987 C: 3.99 D: None of these

Q44 : Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of________________?

A: Mixing B: Adsorption C: Wetting D: Complete wetting

Q45 : Heat of neutralisation of HCl and NaOH is – 57.46 kJ/Kg mole. The heat of ionisation of water will be _____________ kJ/Kg mole?

A: 57.46 B: -57.46 C: 114.92 D: -28.73

Q46 : 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

Q47 : Baffles are provided in heat exchangers to____________?

A: Remove dirt B: Increase heat transfer rate C: Reduce vibrations D: Reduce heat transfer rate

Q48 : The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is__________________?

A: ∞ B: 1 C: 0 D: -ve

Q49 : What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?

A: 0 B: 1 C: 2 D: 3

Q50 : Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?

A: Less than B: Same as C: More than D: Half

Q51 : Size range of the colloids particles is __________________?

A: 5 – 200 milli-microns B: 50 – 200 microns C: 500 – 1000 microns D: 10 – 50 Angstrom

Q52 : The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?

A: Termed as relative saturation B: Not a function of the composition of gas mixture C: Called percentage saturation D: Not a function of the nature of vapor

Q53 : If the partial pressure of the solvent in the vapor phase is equal to the vapor pressure of the solvent at that temperature, then the system is said to be at its___________________?

A: Bubble point B: Saturation temperature C: Dew point D: Both B. and C.

Q54 : _______________ functions are exemplified by heat and work ?

A: Path B: Point C: State D: None of these

Q55 : (1/V) (∂V/∂T)P is the mathematical expression__________________?

A: Joule-Thomson co-efficient B: Specific heat at constant pressure (Cp) C: co-efficient of thermal expansion D: Specific heat at constant volume (CV)

Q56 : A ‘limiting reactant’ is the one, which decides the ____________ in the chemical reaction?

A: Equilibrium constant B: Conversion C: Rate constant D: None of these

Q57 : 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

Q58 : Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

A: Sv B: 1/St C: St D: 1/Sv

Q59 : 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

Q60 : 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

Q61 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q62 : A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

A: 0°C B: 0°K C: 136.5°C D: -136.5°K

Q63 : Cp is expressed in S.I. unit as_______________?

A: J/kg.°K B: 0°K C: W/m2.°C D: W/m.°K

Q64 : Which of the following is not an equation of state ?

A: Bertholet equation B: Clausius-Clapeyron equation C: Beattie-Bridgeman equation D: None of these

Q65 : In a turbine, the fluid expands almost_________________?

A: Isothermally B: Isobarically C: Adiabatically D: None of these

Q66 : Which of the following has the minimum value of COP for a given refrigeration effect ?

A: Reverse Carnot cycle B: Ordinary vapour-compression cycle C: Vapour-compression process with a reversible expansion engine D: Air refrigeration cycle

Q67 : A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

A: 380 B: 630 C: 760 D: 880

Q68 : What is the value of ln y (where y = activity co-efficient) for ideal gases ?

A: Zero B: Unity C: Infinity D: Negative

Q69 : The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________?

A: Specific heat B: 1 Kcal C: Sensible heat D: Latent heat

Q70 : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?

A: Critical B: Boyle C: Inversion D: Reduced

Q71 : The heat of solution depends upon the____________________?

A: Nature of solvent B: Concentration of solution C: Nature of solute D: All A., B. & C.

Q72 : A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be_________________?

A: 3 kmole/hr B: 4 kmole/hr C: 5 kmole/hr D: 6 kmole/hr

Q73 : Which of the following decreases with increase in pressure ?

A: Melting point of ice B: Melting point of wax C: Boiling point of liquids D: None of these

Q74 : If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

A: The solvent begins to freeze out even before B: It will undergo no change until C: It will not solidify even on D: None of these

Q75 : In _______________ process, ions of salts react with water to produce acidity or alkalinity ?

A: Hydration B: Hydrolysis C: Electrolysis D: Dialysis

Q76 : 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

Q77 : In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________?

A: Increase the partial pressure of H2 B: Increase the partial pressure of I2 C: Increase the total pressure and hence shift the equilibrium towards the right D: Not affect the equilibrium conditions

Q78 : 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

Q79 : Which of the following has the smallest least effect on the solubility of a solute into the solvent ?

A: Nature of the solute B: Nature of the solvent C: Temperature D: Pressure

Q80 : Boiling of liquid is accompanied with increase in the__________________?

A: Vapor pressure B: Specific Gibbs free energy C: Specific entropy D: All (A), B. and (C)

Q81 : Internal energy is independent of the ____________ for an ideal gas?

A: Pressure B: Volume C: Both A. & B. D: Neither A. nor B.

Q82 : 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.

Q83 : 1m3 is approximately equal to_________________?

A: 28 litres B: 35 ft3 C: 4.5 litres D: 4.5 ft3

Q84 : Increasing the temperature of an aqueous solution will cause decrease in its________________?

A: Molality B: Mole fraction C: Weight percent D: Molarity

Q85 : The number of degrees of freedom at the triple point of water is__________________?

A: 0 B: 1 C: 2 D: 3

Q86 : Isotopes are atoms having the same _____________________?

A: Mass number B: Number of neutrons C: Atomic mass D: None of these

Q87 : Elements in a periodic table are arranged in order of their__________________?

A: Atomic number B: Mass number C: Atomic weight D: Metallic characteristics

Q88 : Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?

A: Do not lose energy on collision B: Are above the inversion temperature C: Do not exert attractive force on each other D: Do work equal to loss in kinetic energy

Q89 : Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?

A: Vapor to liquid B: Vapor to solid C: Solid to liquid D: One allotropic form to another allotropic form

Q90 : 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.

Q91 : Enthalpy ‘H’ is defined as___________________?

A: H = E – PV B: H = F – TS C: H – E = PV D: None of these

Q92 : Solutions which distil without change in composition are called________________?

A: Ideal B: Saturated C: Supersaturated D: Azeotropic

Q93 : The principle applied in liquefaction of gases is_____________________?

A: Adiabatic expansion B: Joule-Thomson effect C: Both A. and B D: Neither A. nor B

Q94 : A chemical process is said to occur under unsteady state, if the_________________?

A: Inventory changes do not take place B: Ratio of streams entering/leaving are independent of time C: Flow rates & composition both are time dependent D: None of these

Q95 : With increase in temperature, the surface tension of water _____________________?

A: Increases B: Decreases C: Remain constant D: Increases linearly

Q96 : What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?

A: AB3 B: A2B3 C: A2B D: AB2

Q97 : 1 torr is equivalent to_________________?

A: 1 mm Hg B: 1 Pascal C: 1 atm D: 1 mm wc

Q98 : The temperature at which a real gas obeys Boyle’s law is termed as the__________________?

A: Triple point B: Boyle’s temperature C: Eutectic point D: Inversion temperature

Q99 : In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?

A: Increase B: Decrease C: Remain unchanged D: None of these

Q100 : The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?

A: Increases with pressure rise B: Decreases with increasing pressure C: Becomes zero at the critical point D: Both B. & C.

Free Chemical Engineering MCQs Mock Test Online with Answers

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