CHEM-O-PHILIA Team Members: Sr. No. 1 2
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RULES Total Time : 55 minutes
Total Marks : 40 Marking Scheme
Section A B C D
No. Of Questions 10 5 10 5
Correct Answer +1 +2 +1 +2
Incorrect Answer -0.5 -0.5 -0.5 -0.5
The answers should be ticked on the question paper with a pen clearly and unambiguously. No separate answer sheet would be provided. p rovided. No marks will be deducted on leaving a question or on giving an incorrect answer to a fill-up type of questions. Note for Assertion-Reason Type Questions (in Section B): State the correct option on the left hand side of the question. If the test-taker exceeds the time limit or resorts to any malpractices, it will amount to immediate disqualification. In case of issues, if any, final authority lies with the event co-ordinators; and participants will have no say in such issues.
Chem-o-philia Elims, Surat
Section A
1. Which of the following fluid forces are not considered in the Navier -Stoke's equation a) Gravity forces b) Viscous forces c) Pressure forces d) Turbulent forces 2. The final boiling points of gasoline, diesel, atmospheric gas oil (AGO) and lubricating oils vary as a) Gasoline > diesel > AGO > lubricating oils b) Lubricating oils > AGO > diesel > gasoline c) AGO > lubricating oils > diesel > gasoline d) Lubricating oils > diesel > AGO > gasoline 3. For an exothermic reversible reaction, which one of the following correctly describes the dependence of the equilibrium constant (K) with temperature (T) and pressure (P) ? a) K is independent of T and P b) K increases with an increase in T and P c) K increases with T and decreases with P d) K decreases with an increase in T and is independent of P 4. A beaker is filled with two immiscible liquids of densities sufficiently different so that they settle quickly with a clear interface. A solid cube floats at the interface of two liquids. Therefore, it can be inferred that: a) The solid has a density that is equal to the arithmetic average of the densities of the lighter liquid and the heavier liquid. b) The solid has a density that is equal to the ha rmonic average of the densities of the lighter liquid and the heavier liquid. c) The solid has a density that is equal to the geometric average of the densities of the lighter liquid and the heavier liquid. d) The density of the solid is a weighted average of the densities of the two liquids where the weighing factors are the volume fractions of the solid immersed in those phases respectively. 5. A consecutive reaction : K
K
1 2 A B C
is characterized by a) maxima in the concentration of A b) maxima in the concentration of B c) High exothermicity d) None of these
Chem-o-philia Elims, Surat
6. While cooling towers is in operation, ideally water is lost in 3 ways from the tower to the surroundings. Two of them are Evaporation loss and Drift Losses. The third one is: a) Loss due to Leakage b) Blowdown Losses c) Entrapment Losses d) None of these. 7. Which of these is not a type of Distillation: a) Vacuum Distillation b) Molecular Distillation c) Equilibrium Distillation d) None of these 8. Decomposition of feedstock by heating at a high temperature is very specifically known as: a) Pyrolysis b) Cracking c) Destructive Distillation d) Gasification 9. Toothpaste, that we use every day is the a very good example of a) Bingham Fluid b) Power-law Fluid c) Inviscid Fluid d) Torrefied Fluid 10. An undesirable characteristic for the solvent used in gas absorption is: a) Low vapour pressure b) Low Viscosity c) High Gas Solubility d) Low melting point
Chem-o-philia Elims, Surat
Section B
1. Water is flowing under laminar conditions in a pipe of length L. If the diameter of the pipe is doubled, for a constant volumetric flow rate, the pressure drop across the pipe a) Decreases 2 times b) Decreases 16 times c) Increases 2 times d) Increases 16 times 2. The local velocity of a fluid along a streamline can be measured by a) Pitot Tube b) Venturi Meter c) Rotameter d) Orifice Meter 3. Which of these is a Kettle-type Reboiler:
a)
b)
c) d) All of these
Chem-o-philia Elims, Surat
Marking scheme for this type of questions: A. B. C. D.
Assertion is true, Reason is true and it is the correct reason for the assertion. Assertion is true, Reason is true but it is not the correct reason for the assertion. Assertion is true, Reason is false. Assertion is false.
4. Assertion: Raolt’s Law cannot predict the existence of azeotropes. Reason: It can be deduced from Raolt’s law that the mole fraction of more volatile component in the gas phase is always more than that in the liquid phase and hence the condition of azeotrope formation cannot be theoretically explained by Raolt’s law.
a s s
5. The figure has various kinds of ______________________________________ which are used in ______________________________ .
Chem-o-philia Elims, Surat
Section C 1. A milkman mixes 20 litres of water with 80 litres of milk. After selling one-fourth of this mixture, he adds water to replenish the quantity that he has sold. What is the current proportion of water to milk? a) 2:3 b) 1:2 c) 1:3 d) 3:4 2. The total number of integer pairs (x, y) satisfying the equation x + y = xy is a) 0 b) 1 c) 2 d) 3 3. Each family in a locality has at most two adults, and no family has fewer than 3 children. Considering all the families together, there are more adults than boys, more boys than girls, and more girls than families. Then the minimum possible number of families in the locality is a) 1 b) 4 c) 2 d) 3 4. Karan and Arjun run a 100-metre race, where Karan beats Arjun by 10 metres. To do a favour to Arjun, Karan starts 10 metres behind the starting line in a second 100metre race. They both run at their earlier speeds. Which of the following is true in connection with the second race? a) Karan and Arjun reach the finishing line simultaneously b) Arjun beats Karan by 1 metre. c) Arjun beats Karan by 11metres. d) Karan beats Arjun by 1 metre. 5. The length, breadth and height of a room are in the ratio 3:2:1. If the breadth and height are halved while the length is doubled, then the total area of the four walls of the room will e) Remains the same f) Decreases by 13.64% g) Decreases by 30% h) Decreases by 18.75% 6. When you reverse the digits of the number 13, the number increases by 18. Howmany other two-digit numbers increase by 18 when their digits are reversed? a) 5 b) 6 c) 7 d) 8
Chem-o-philia Elims, Surat
7. If a man cycles at 10 km/hr, then he arrives at a certain place at I p.m. If he cycles at 15 km/ hr, he will arrive at the same place at 11 a.m. At what speed must he cycle to get there at noon? a) 11km/h b) 12 km/h c) 12.7km/h d) 13.2km/h 8. In the adjoining figure, chord ED is parallel to the diameter of AC of the circle. If the angle CBE is 65°, then what is the value of angle DEC?
35° b) 55° c) 45° d) 25° 23 23 9. The remainder, when (15 + 23 ) is divided by 19, is a) 4 b) 15 c) 0 d) 18 10. What is the angle between the hands of a wall clock? I. The time is between 6 and 7. II. Half an hour back the angle was 0. a) If statement I alone is suficient but statement II alone is not sufficient b) If statement II alone is sufficient but statement I alone is not sufficient c) If both statements I & II together are sufficient but neither statements alone is sufficient d) If each statement alone is sufficient e) If statement I &II together are not sufficient. a)
Chem-o-philia Elims, Surat
Section D
Data for questions 1 and 2: A liquid phase reaction A→ B is conducted in a Continuous Stirred Tank Reactor (CSTR) followed by a Plug Flow Reactor (PFR). The overall conversion achieved by the whole reaction system consisting of CSTR and PFR is 98%. The volume of the CSTR is 50 lit. A is fed into the system at a concentration of 3 mol/lit and volumetric flow 2 rate of 5 lit/min. The rate expression is given by: – rA = 0.125 CA mol/lit-min where CA is in mol/lit. 1. The conversion achieved by CSTR is a) 50 % b) 60% c) 70 % d) 80% 2. A double-pipe heat exchanger is to be designed to heat 4 kg/s of a cold feed from 20°C to 40°C using a hot stream available at 160°C and a flow rate of 1kg/s. The two streams have equal specific heat capacities and the overall heat transfer coefficient 2 of the heat exchanger is 640 W/m -K. Then the ratio of the heat transfer areas required for the co-current to counter-current modes of operation is: (ln 2 = 0.693 and ln 3.5 = 1.253) a) 0.730 b) 0.920 c) 1.085 d) 1.250 3. According to the specifications given by TEMA, a 1-2 pass shell and tube heat exchangers is constructed, which will be used in the a Sulphuric Acid production plant. The STHE has floating head and sulphuric acid (ρ = 1.84kg/L) flows on the tube-side while water flows on the shell side. The diameter of the tubes is 10mm. What will be the pitch of the traingular tubular arrangement? a) 12.50 mm b) 18.40 mm c) 10 3 mm d) 7.84 mm 4. Crude oil of viscosisty 2.25 Stokes, flows through a 20cm diameter pipe. The rate of flow of liquid is given as 1.5L/s. The flow will be: a) Laminar b) Turbulent c) Transition d) Need more data 5. __________________ is the formation and then immediate implosion of small liquidfree zones ("bubbles") – that are the consequence of forces acting upon the liquid. This phenomenon is observed in pumps and is generally avoided by ______________.
