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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1751. |
Which of the following is used for the pressure measurement of only liquid?(a) Manometer(b) Piezometer(c) Differential Manometer(d) None of the mentioned |
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Answer» Correct choice is (b) Piezometer The explanation is: Piezometer is a pressure measuring device used to measure the pressure of liquid only. |
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| 1752. |
A closed manometer is filled with 3 fluids first on the left leg with density 8 kg/m^3 and length 10 cm, middle one with density 10 kg/m^3 and height difference 5 cm more on right leg and the third on the right leg with density 15 kg/m^3, what is the length of the third liquid?(a) 1 cm(b) 2 cm(c) 3 cm(d) 4 cm |
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Answer» The correct choice is (b) 2 cm The explanation: Pressure on both legs should be equal, => 8*10 = 10*5 + 15*x, => x = 2 cm. |
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| 1753. |
A closed end manometer is filled with a gas on one end and other end is close with vacuum, height difference of liquid (density = 10000 Kg/m^3) 25 cm, what is the pressure of gas?(a) 0.1 atm(b) 0.24 atm(c) 0.36 atm(d) 0.9 atm |
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Answer» Right choice is (b) 0.24 atm The best explanation: Pressure = 10000*10*0.25/101325 = 0.24 atm. |
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| 1754. |
What is the pressure difference of the ends of a U-tube manometer filled with liquid (density = 10 kg/m^3) the difference in the height of the liquid in the tubes is 5 cm?(a) 5 N/m^2(b) 10 N/m^2(c) 15 N/m^2(d) 20 N/m^2 |
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Answer» The correct choice is (a) 5 N/m^2 To explain I would say: Pressure difference = dgh = 10*10*0.05 = 5 N/m^2. |
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| 1755. |
10 moles of C6H12 reacted with 18 moles of O2, how many moles of CO2 will produce?(a) 3(b) 6(c) 9(d) 12 |
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Answer» Right choice is (d) 12 Easy explanation: The balanced chemical reaction is C6H12 + 9O2 -> 6CO2 + 3H2O, => O2 is the limiting reagent, => moles of CO2 = (18/9)*6 = 12. |
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| 1756. |
15 J of heat is supplied to a system and system does 5 J of work, what is the change in internal energy?(a) 5 J(b) 10 J(c) 15 J(d) 20 J |
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Answer» Right choice is (b) 10 J Explanation: ∆U = 15 – 5 = 10 J. |
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| 1757. |
10 J of heat and 5 J of work are supplied to the system, what is the change in internal energy?(a) 5 J(b) 10 J(c) 15 J(d) 20 J |
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Answer» Correct choice is (c) 15 J For explanation: ∆U = 5 + 10 = 15 J. |
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| 1758. |
What is the heat transferred from the system if the enthalpy of the output is 5 J and input is 10 J?(a) -5 J(b) -10 J(c) -15 J(d) 5 J |
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Answer» Right option is (d) 5 J Easiest explanation: Heat transferred from the system = 10 – 5 = 5 J. |
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| 1759. |
What is the heat transferred to the system if the enthalpy of the output is 15 J and input is 10 J?(a) 1 J(b) 2 J(c) 4 J(d) 5 J |
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Answer» Correct answer is (d) 5 J For explanation I would say: Q = 15 – 10 = 5 J. |
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| 1760. |
A closed U-tube manometer has a gas on one end with pressure 10 Pa and other end has vacuum, what is the approximate density of the liquid if the height difference of the liquid is 10 cm?(a) 1 Kg/m^3(b) 10 Kg/m^3(c) 100 Kg/m^3(d) 1000 Kg/m^3 |
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Answer» Right option is (b) 10 Kg/m^3 To explain I would say: Pressure of gas = Pressure due to height difference of liquid = d*g*h, => 10 = d*10*0.1, => d = 10 Kg/m^3. |
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| 1761. |
4 moles of CO and 2 moles of O2 are reacted, then what type of reactant O2 is?(a) Limiting reagent(b) Excess reagent(c) Can’t say(d) None of the mentioned |
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Answer» The correct choice is (d) None of the mentioned The explanation is: The balanced chemical reaction is 2CO + O2 -> 2CO2, => If 4 moles of CO are reacting, 2 moles of O2 will react, this means none of the two is limiting reagent or excess reagent. |
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| 1762. |
5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?(a) 5 J/Kg(b) 10 J/Kg(c) 15 J/Kg(d) 20 J/Kg |
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Answer» Right answer is (b) 10 J/Kg Best explanation: 25 = 5(U – 10), => U = 15 J/Kg. |
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| 1763. |
What is the height difference of the water (density = 1000 Kg/m3), if the change in velocity is 10 m/s and change in pressure is 1000 Pa?(a) 1.4 m(b) 2.9 m(c) 4.2 m(d) 5.1 m |
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Answer» Correct option is (d) 5.1 m To explain I would say: ∆h = (1000/1000 + 10^2/2)/10 = 5.05 m. |
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| 1764. |
What is the heat transferred to 2 Kg and 5 m3 of a rigid system, with change in enthalpy 5 J/Kg?(a) 5 J(b) 10 J(c) 15 J(d) 20 J |
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Answer» Right choice is (b) 10 J Best explanation: Since the system is rigid, ∆V = 0, => Q = ∆H = 5*2 = 10 J. |
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| 1765. |
What is the height difference of the water (density = 1000 Kg/m^3), if the change in velocity is 6 m/s and change in pressure is 2000 Pa?(a) 1.2(b) 2.0(c) 3.6(d) 4.4 |
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Answer» The correct option is (b) 2.0 Best explanation: ∆h = (2000/1000 + 6^2/2)/10 = 2.0 m. |
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| 1766. |
2 moles of N2 and 8 moles of H2 are reacted, then what type of reactant N2 is?(a) Limiting reagent(b) Excess reagent(c) Can’t say(d) None of the mentioned |
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Answer» The correct choice is (a) Limiting reagent Explanation: The balanced chemical reaction is N2 + 3H2 -> 2NH3, => If 2 moles of N2 are reacting only 6 moles of H2 will react, this means H2 is an excess reagent and N2 is a limiting reagent. |
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| 1767. |
A reactor is supplied with 6 moles of N2 and 9 moles of H2, if 3 moles of NH3 is produced, how many moles of H2 are left at the end?(a) 1.5(b) 3(c) 4.5(d) 6 |
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Answer» The correct option is (c) 4.5 Easy explanation: The reaction is N2 + 3H2 -> 2NH3, => extent of reaction = (3 – 0)/2 = 1.5, => moles of H2 left = 9 – 1.5*3 = 4.5. |
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| 1768. |
In a 2 stage process Q1 = 5 J, Q2 = 10 J, if the change in internal energy in first stage is 10 J and the total change in internal energy is 20 J, what is the work do done in second stage?(a) 0(b) 5 J(c) 10 J(d) – 5 J |
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Answer» Right choice is (a) 0 To explain I would say: Change in internal energy in second stage = 20 – 10 =10 J, Work done in second stage = 10 – 10 = 0. |
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| 1769. |
What are the number of degrees of freedom if the number of variables and number of equations are 18 and 7 respectively?(a) 7(b) 9(c) 11(d) 15 |
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Answer» Right option is (c) 11 The best I can explain: Number of degrees of freedom = 18 – 7 = 11. |
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| 1770. |
Degrees of freedom calculation treat which kind of variables?(a) Intensive(b) Extensive(c) Both(d) None of the mentioned |
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Answer» The correct answer is (a) Intensive For explanation: Degrees of freedom calculation treat intensive variables. |
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| 1771. |
What are the number of degrees of freedom if the number of variables and number of equations are 21 and 9 respectively?(a) 7(b) 9(c) 10(d) 12 |
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Answer» Correct choice is (d) 12 The explanation: Number of degrees of freedom = 21 – 9 = 12. |
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| 1772. |
What is the reversible work done if 4 m^3 of an ideal gas is compressed adiabatically pV1.5 = K from 2 Pa to 16 Pa?(a) 4 J(b) 16 J(c) 24 J(d) 56 J |
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Answer» Correct option is (b) 16 J For explanation: V2 = (2*4^1.5/16)^1/1.5 = 1 m^3, => W = –4∫^1pdv = –4∫^1 (16/v^1.5) dv = 16 J. |
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| 1773. |
Which of the following cannot be treated as a variable for degrees of freedom calculation?(a) Temperature(b) Pressure(c) Volume(d) Work |
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Answer» The correct choice is (c) Volume To elaborate: Since Volume is an extensive variable, it cannot be treated as a variable for degrees of freedom calculation. |
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| 1774. |
What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?(a) 5(b) 10(c) 15(d) 20 |
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Answer» Right choice is (b) 10 The explanation: Number of degrees of freedom = 15 – 5 = 10. |
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| 1775. |
15 Kg/s of a fluid with density 5 Kg/m^3 is passed into a tank of capacity 30 m^3, how much time will it take to fill the tank?(a) 3 Second(b) 10 Second(c) 30 Second(d) 100 Second |
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Answer» Right choice is (b) 10 Second To explain I would say: Flow rate of fluid = 15/5 = 3 m^3/s, => Time = 30/3 = 10 second. |
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| 1776. |
What is the pressure of 1 mole of an ideal gas at 27^oC occupying 1 Liter of volume?(a) 12.31 atm(b) 24.63 atm(c) 36.95 atm(d) 48.94 atm |
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Answer» The correct option is (b) 24.63 atm The best explanation: For ideal gas PV = nRT, => P = 1*0.0821*300/1 = 24.63 atm. |
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| 1777. |
10 Kg/s of a fluid with density 10 Kg/m^3 is passed into a tank of capacity 50 m3, how much time will it take to fill the tank?(a) 5 Second(b) 50 Second(c) 500 Second(d) 5000 Second |
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Answer» The correct answer is (b) 50 Second Best explanation: Flow rate of fluid = 10/10 = 1 m^3/s, => Time = 50/1 = 50 second. |
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| 1778. |
What is the reversible work done if 8 m^3 of an ideal gas is compressed isothermally from 4 Pa to 16 Pa?(a) 12.48 J(b) 28.55 J(c) 44.36 J(d) 56.96 J |
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Answer» Correct answer is (c) 44.36 J To elaborate: V2 = 8*4/16 = 2 m^3, => W = –8∫^2pdv = –8∫^2 (32/v) dv = 32 ln4 = 44.36 J. |
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| 1779. |
What is the reversible work done if 4 m^3 of an ideal gas is compressed adiabatically pV2.5 = K from 1 Pa to 32 Pa?(a) 18.6 J(b) 20.4 J(c) 24.6 J(d) 26.2 J |
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Answer» Correct answer is (a) 18.6 J For explanation I would say: V2 = (1*4^2.5/32)^1/2.5 = 1 m^3, => W = –4∫^1pdv = –4∫^1 (32/v^2.5) dv = 18.6 J. |
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| 1780. |
What is the reversible work done if 4 m^3 of an ideal gas is compressed isothermally from 2 Pa to 8 Pa?(a) 2.01 J(b) 6.11 J(c) 8.56 J(d) 11.09 J |
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Answer» The correct answer is (d) 11.09 J To explain: V2 = 2*4/8 = 1 m^3, => W = –4∫^1pdv = –4∫^1 (8/v) dv = 8 ln4 = 11.09 J. |
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| 1781. |
What is the reversible work done if 5 m^3 of an ideal gas is compressed isothermally from 1 Pa to 5 Pa?(a) 4.41 J(b) 8.01 J(c) 10.20 J(d) 14.18 J |
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Answer» Right option is (b) 8.01 J The best I can explain: V2 = 1*5/5 = 1 m^3, => W = –5∫^1pdv = –5∫^1 (5/v) dv = 5 ln5 = 8.04 J. |
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| 1782. |
What is the shape of a P-V curve for an ideal gas?(a) Straight line(b) Parabolic(c) Hyperbolic(d) Ellipse |
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Answer» The correct option is (c) Hyperbolic To explain: P-V curve is hyperbolic for an ideal gas. |
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| 1783. |
What is the shape of a V-T curve for ideal gas?(a) Straight line(b) Parabolic(c) Hyperbolic(d) Ellipse |
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Answer» The correct choice is (a) Straight line To explain I would say: V-T curve is straight line for ideal gas. |
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| 1784. |
An object is dipped in water, if the weight of the object measured by spring balance is 10 g and buoyancy force acting on the object is 0.1 N then what is the actual mass of the object?(a) 10 g(b) 20 g(c) 30 g(d) 40 g |
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Answer» Right option is (b) 20 g For explanation I would say: Weight of the object = (10*10^–3)*10 + 0.1 = 0.2 N, => actual mass of the object = 0.2/10 = 0.02 kg = 20 g. |
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| 1785. |
How many moles of H2 are recycled?(a) 1.5(b) 2.2(c) 2.8(d) 3.9 |
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Answer» Right choice is (d) 3.9 For explanation: Moles of H2 in G stream = 10*0.8 – 3*10*0.2*0.8 = 3.2 = moles of H2 in H stream. Moles of H2 in P stream = 0.95*7.5 = 7.125, => moles of H2 in R stream = 7.125 – 3.2 = 3.925. |
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| 1786. |
What is the pressure if 10 N of force acts at 30 degrees from the surface of area 5 m^2?(a) 1 Pa(b) 2 Pa(c) 5 Pa(d) 10 Pa |
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Answer» The correct option is (a) 1 Pa The explanation is: Normal component of the force = 10sin30^o = 10*0.5 = 5 N, => Pressure = 5/5 = 1 Pa. |
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| 1787. |
What is the value of R?(a) 1.4(b) 2.8(c) 4.2(d) 6.8 |
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Answer» The correct choice is (c) 4.2 To explain: Recycled moles of H2 = 3.925, recycled moles of N2 = (10*0.2 – 10*0.2*0.8) – 0.05 = 0.35, => R = 3.925 + 0.35 = 4.275. |
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| 1788. |
What is the shape of a P-T curve for ideal gas?(a) Straight line(b) Parabolic(c) Hyperbolic(d) Ellipse |
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Answer» Right option is (a) Straight line To explain I would say: P-T curve is a straight line for ideal gas. |
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| 1789. |
What is the pressure if 10 N of force is acting normally on 5 m^2 surface area?(a) 2 Pa(b) 4 Pa(c) 8 Pa(d) 10 Pa |
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Answer» The correct choice is (a) 2 Pa Best explanation: Pressure = 10/5 = 2Pa. |
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| 1790. |
What is the pressure of 1900 mm Hg in atm?(a) 0.5(b) 1(c) 1.5(d) 2.5 |
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Answer» The correct option is (d) 2.5 Best explanation: Pressure = 1900/760 = 2.5 atm. |
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| 1791. |
Which of the following term does not involve in ideal gas law?(a) Pressure(b) Volume(c) Temperature(d) Time |
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Answer» Right option is (d) Time Easy explanation: Ideal gas law is PV = nRT, which does not involve time. |
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| 1792. |
Reversible process can be reversed by differential change in which of the following?(a) Temperature(b) Pressure(c) Volume(d) All of the mentioned |
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Answer» The correct choice is (d) All of the mentioned The best explanation: Differential change in driving potential (dP, dV, dT, etc) can reverse a reversible process. |
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| 1793. |
How long would it take for an irreversible process to complete?(a) Instant(b) Finite(c) Infinite(d) Cannot say |
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Answer» Right choice is (b) Finite For explanation I would say: It takes a finite time for an irreversible process to complete. |
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| 1794. |
What is the pressure of 38 mm Hg in atm?(a) 0.05(b) 0.5(c) 1(d) 5 |
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Answer» The correct answer is (a) 0.05 The explanation is: Pressure = 38/760 = 0.05 atm. |
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| 1795. |
What is the pressure of 1900 Torr in bar?(a) 2.1(b) 2.3(c) 2.4(d) 2.5 |
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Answer» The correct answer is (c) 2.4 For explanation I would say: Pressure = 1900/760*100000/101325 = 2.4 bar. |
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| 1796. |
What is the pressure of 190 torr in atm?(a) 0.25(b) 0.5(c) 0.8(d) 1 |
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Answer» The correct choice is (a) 0.25 Explanation: Pressure = 190/760 = 0.25 atm. |
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| 1797. |
The equation of material balance, (Final condition + Sum of outputs) is equal to which of the following?(a) Initial condition – Sum of inputs(b) Initial condition + Sum of inputs(c) Sum of inputs – Initial condition(d) None of the mentioned |
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Answer» Right option is (b) Initial condition + Sum of inputs The explanation: Equation of material balance is Final condition – Initial condition = Sum of inputs – Sum of outputs, => Final condition + Sum of outputs = Initial condition + Sum of inputs. |
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| 1798. |
Which of the following does both of the reversible and irreversible processes involve?(a) Increase molecular disorder(b) Dissipative effects(c) Friction(d) All of the mentioned |
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Answer» The correct option is (a) Increase molecular disorder To explain I would say: Both reversible and irreversible processes increases molecular disorder. |
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| 1799. |
A container has 10 grams of water 5 grams of water is added and 2 grams of water is taken out, what is the final amount of water?(a) 7 grams(b) 10 grams(c) 13 grams(d) 15 grams |
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Answer» Right answer is (c) 13 grams The explanation: Final condition = Initial condition + sum of inputs – sum of outputs = 10 + 5 – 2 = 13 grams. |
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| 1800. |
What is the pressure of 38 mm Hg in Torr?(a) 0.05(b) 0.5(c) 1(d) 38 |
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Answer» The correct option is (d) 38 To elaborate: Pressure = 38 Torr. |
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