GATE 2027 Sample Paper (Chemical - CH)

SAMPLE PAPER

S A M P L E Q U E S T I O N P A P E R

GATE 2027 (Chemical - CH)
Modelled on the actual exam pattern
.

QUESTIONS MAX MARKS TIME

65 100 180 Min

GENERAL INSTRUCTIONS

1. This paper contains 65 multiple-choice questions. All questions are compulsory.

2. Each question has four options — (A), (B), (C) and (D) — of which only one is correct.

3. Each correct answer carries 1 or 2 marks (varies by question); for a multiple-choice question, one-third (1-mark
question) or two-thirds (2-mark question) of the allotted marks is deducted for a wrong answer; numerical-answer-type
questions carry no negative marking.

4. Total time allowed is 180 minutes. Manage your time across all sections.

5. Use of calculators, mobile phones or any electronic device is not permitted.

6. Attempt the paper first, then check your answers against the Answer Key at the end.

Candidate Name: Roll No.: Date:

SAMPLE PAPER

GATE 2027 (Chemical - CH)
SAMPLE QUESTION PAPER

Questions 65 Max Marks 100 Time 180 Min

Attempt all questions. Choose the one correct option for each.

GENERAL APTITUDE

1. Two design consultants, P and Q, started working from 8 AM for a client. The client budgeted a total Of USD 3000
for the consultants. P stopped working when the hour hand moved by 210 degrees on the clock. Q stopped working
when the hour hand moved by 240 degrees. P took two tea breaks Of 15 minutes each during her shift, but took no
lunch break. Q took only one lunch break for 20 minutes, but no tea breaks. The market rate for consultants are USD
200 per hour and breaks are not paid. After paying the consultants, the client shall have USD _______ remaining in the
budget.

(A) 000.00

(B) 166.67

(C) 300.00

(D) 433.33

2. The missing number in the given sequence 343, 1331,
_______ 4913 is

(A) 3375

(B) 2744

(C) 2197

(D) 4096

3. X is an online media provider. By offering unlimited and exclusive online content at attractive prices for a loyalty
membership, X is almost forcing its customers towards its loyalty membership. If its loyalty membership continues to
grow at its current rate, within the next eight years more households will be watching X than cable television. Which
one Of the following statements can be inferred from the above paragraph?

(A) Most households that subscribe to X's loyalty membership discontinue watching cable television

(B) Non-members prefer to watch cable television

(C) Cable television operators don't subscribe to X's loyalty membership

(D) The X is cancelling accounts Of non-members

4. A square has sides 5 cm smaller than the sides Of a 5. The product of three integers X, Y and Z is 192. Z is
second square. The area Of the larger square is four equal to 4 and P is equal to the average of X and Y. What
times the area Of the smaller square. The side Of the is the minimum possible value of P?
larger square is ______ cm.
(A) 6
(A) 18.50 (B) 7
(B) 15.10 (C) 8
(C) 10.00 (D) 9.5
(D) 8.50

6. In a press meet on the recent scam, the minister said, 7. Suresh wanted to lay a new carpet in his new mansion
"The buck stops here". What did the minister convey by with an area Of 70 x 55 sq. mts. However an area Of 550
the statement? sq. mts. had to be left out for flower pots. If the cost Of
carpet is Rs. 50 per sq. mtS., how much money (in Rs.)
(A) He wants all the money
will be spent by Suresh for the carpet now?
(B) He will return the money
(A) Rs. 1,65,000
(C) He will assume final responsibility
(B) Rs. 1,92,500
(D) He will resist all enquiries
(C) Rs. 2,75,000

(D) Rs. 1,27,500

8. A person divided an amount Of Rs. 100,000 into two 9. In a country Of 1400 million population, 70% own
parts and invested in two different schemes. In one he mobile phones. Among the mobile phone owners, only
got profit and in the Other he got 12%. If the profit 294 million access the Internet. Among these Internet
percentages are interchanged with these investments he users, only half buy goods from e-commerce portals.
would have got Rs.120 less. Find the ratio between his What is the percentage Of these buyers in the country?
investments in the two schemes.
(A) 10.50
(A) 9: 16 (B) 14.70
(B) 11 : 14 (C) 15.00
(C) 37 : 63 (D) 50.00
(D) 47 : 53

10. John Thomas, an ________ writer, passed away in 2018.

(A) imminent

(B) prominent

(C) eminent

(D) dominant

CHEMICAL ENGINEERING

11. In a laboratory experiment, a unit pulse input of tracer is given to an ideal plug flow reactor operating at steady
State With a recycle ratio, R = I. The exit age distribution, E(t) , of the tracer at the outlet of the reactor is measured.
The first four pulses observed at t1 , t2, t3, and t4 are shown below. In addition, use the following data and
assumptions: R is defined as ratio of the volume of fluid returned to the entrance of the reactor to the volume leaving
the system. NO reaction occurs in the reactor Ignore any dead volume in the recycle loop If The space time of the plug
now reactor is r seconds, which one of the following is correct?

(A) t1 =τ, t2=2τ , t3=3τ and t4=4τ

(B) t1 =τ/2, t2=τ , t3=3τ/2 and t4=2τ

(C) t1 =τ/2, t2=τ/4 , t3=τ/8 and t4=τ/16

(D) t1 =τ/3, t2=2τ/3 , t3=τ and t4=4τ/3

12. Consider the gas phase reaction N2O4 ↔2N02 13. A process with transfer function, G = (2/s - 1) is to
p
occurring in an isothermal and isobaric reactor be controlled by a feedback proportional controller with a
maintained at 298 K and I .0 bar. The standard Gibbs gain K . If the transfer functions of all other elements in
c
energy change of the reaction at 298 K is = 5253 J mol-l. the control loop are unity, then which ONE of the
The standard states are those of pure ideal gases at 1.0 following conditions produces a stable closed loop
bar. The equilibrium mixture in the reactor behaves as an response?
ideal gas. The value Of the universal gas constant is
(A) K = 0.25
c
8.314 J mol-l K-l. If one mole of pure N2O4 is initially
(B) 0 K 0.25
charged to the reactor, the fraction Of that decomposes c

into N02 at equilibrium is (C) 0.25 K 0.5
c
(D) K > 0.5
(A) 0 c

(B) 0.17

(C) 0.38

(D) 1

14. Producer gas is obtained by 15. In a box, there are 5 green balls and 10 blue balls. A
person picks 6 balls randomly. The probability that the
(A) passing air through red hot coke
person has picked 4 green balls and 2 blue balls is
(B) thermal cracking of naphtha
(A) 42/1001
(C) passing steam through red hot coke
(B) 45/1001
(D) passing air and steam through red hot coke
(C) 240/1001

(D) 420/1001

16. Consider the two countercurrent heat exchanger designs for heating a cold stream from ��
to ��
, as shown in figure.
���� ������
The hot process stream is available at ��
. The inlet stream conditions and overall heat transfer coefficients are identical
����
I and II
in both the designs. The heat transfer area in Design I and Design II are respectively �� ��If heat losses are
���� ����
neglected, and if both the designs are feasible, which of the following statements holds true:
I > II
(A) �� ��TI TII
���� ���� out out
(B) I��= II ��TI = TII
���� ���� out out
I II
(C) ����T I >T II
���� ����out out
I II
(D) ����T I = TII
��������out out

17. A polymer plant with a production capacity of 10,000 18. Consider an incompressible flow of a constant
tons per year has an overall yield of 70%, on mass basis property fluid over a smooth, thin and wide flat plate.
(kg of product per kg of raw material). The raw material The free stream flows parallel to the surface of the plate
costs Rs. 50,000 per ton. A process modification is along its length and its velocity is constant. Value of the
proposed to increase the overall yield to 75% with an Reynolds number at a distance of 2.0 m from the leading
investment of Rs. 12.5 crore. In how many years can the edge of the plate is 8000. The now within the boundary
invested amount be recovered with the additional profit? layer at a distance Of I.0 m from the leading edge Of the
___________ plate is

(A) 2.77 to 2.57 (A) laminar

(B) 2.57 to 2.77 (B) turbulent

(C) 2.55 to 30 (C) transitioning from laminar to turbulent

(D) 2.55 to 2.70 (D) inviscid

19. For a binary nonideal A-B mixture exhibiting a 20. A feed stream containing pure species L flows into a
minimum boiling azeotrope, the activity coefficients, ���� (i = reactor, where L is partly converted to M as shown in the
A, B), must satisfy figure. The mass flow rate of the recycle stream is 20% of
that of the product stream. The overall conversion Of L
(A) ��> 1, ��> 1
A B
(based on mass units) in the process is 30%. Assuming
(B) ��1, ��> 1
A B steady state operation, the one-pass conversion of L
(C) ��= 1, ��= 1 (based on mass units) through the reactor is
A B
(D) ��1, ��1
A B (A) 34.2%

(B) 30%

(C) 26.3%

(D) 23.8%

22. A binary distillation column is operating with a mixed

21. feed containing 20 mol% vapour. If the feed quality is
changed to 80 mol % vapour, the change in the slope of
(A) 7.95 to 8.03
the q-line is ________________
(B) 7.99 to 7.98
(A) 3.6 to 3.9
(C) 7.99 to 8.01
(B) 3.7 to 4.01
(D) 8.01 to 8.03
(C) 3.4 to 3.7

(D) 3.9 to 3.6

23. A fluid flows over a heated horizontal plate
maintained at temperature Tw. The bulk temperature of
the fluid is T∞. The temperature profile in the thermal
boundary layer is given by: T=T +(T -T )[(1)/(2)(yδ )3-
w w ∞ t
(3)/(2)(yδ )], 0 ≤ y ≤ δ Here, y is the vertical distance
t t
from the plate, 5t is the thickness of the thennal
boundary layer and k is the thermal conductivity of the
fluid. The local heat transfer coefficient is given by

(A) K/2δt

(B) K/δt

(C) 3 K/2δt

(D) 2K/δt

24. Three distillation schemes for separating an equimolar, constant relative volatility ABC mixture into nearly pure
components are shown. The usual simplifying assumptions such as constant molal overflow, negligible heat loss, ideal
trays are valid. All the schemes are designed for minimum total reboiler duty. Given that the relative volatilities are in
the ratio a :a :a = 8:2:1, the correct option that arranges the optimally-designed schemes in ascending order of total
A B C
reboiler duty is

(A) I, II, III

(B) III, I, II

(C) II, I, III

(D) III, II, I

25. For a fully-developed turbulent hydrodynamic 26. The molecular formula of the predominant chemical
boundary layer for flow past a flat plate, the thickness of compound in commercial sugar is
the boundary layer increases with distance x from the
(A) C12H22O11
leading edge of the plate, along the free-stream flow
(B) C12H24O12
direction, as
(C) C6H10O5
0.5
(A) ��
(D) C6H12O6
(B) 1.5
��
0.4
(C) ��

(D) 0.8
��

27. For a single component system, vapor (subscript ��) 28. Consider a batch distillation process for an equimolar
and liquid (subscript ��) coexist in mechanical, thermal and mixture of benzene and toluene at atmospheric pressure.
phase equilibrium when The mole fraction of benzene in the distillate collected
after 10 minutes is 0.6. The process is further continued
(A) ��
= ��(equality of specific internal energy)
�� f
for additional 10 minutes. The mole fraction of benzene
(B) ℎ = ℎ (equality of specific enthalpy)
�� f in the total distillate collected after the 20 minutes of
(C) ��
= ��(equality of specific entropy) operation is
�� f
(D) ��
= ��(equality of specific Gibbs free energy)
�� f (A) less than 0.6

(B) exactly equal to 0.6

(C) exactly equal to 0.7

(D) greater than 0. 7

29. Which ONE of the following statements is CORRECT 30. In a constant-pressure cake filtration with an
for the surface renewal theory? incompressible cake layer, volume of the filtrate (V) is
measured as a function of time t. The plot of t/V versus V
(A) Mass transfer takes place at steady state
results in a straight line with an intercept of 104 s m-3.
(B) Mass transfer takes place at unsteady state
Area of the filter is 0.05 m2, viscosity of the filtrate is 10-
(C) Contact time is same for all the liquid elements 3 pa s, and the overall pressure drop across the filter is
(D) Mass transfer depends only on the film resistance 200 kPa. value of the filter-medium resistance (in In-I) is

(A) 1 x 109

(B) 1 x 1010

(C) 1 x 1011

(D) 1 x 1012

31. Consider the hyperbolic functions in Group — 1 and 32. In order to produce fine solid particles between 5 and
their definitions in Group — The correct combination is: 10 μm, the appropriate size reducing equipment is

(A) P-IV, Q-I, R-III, S-II (A) fluid energy mill

(B) P-II, Q-III, R-I, S-IV (B) hammer mill

(C) P-IV, Q-I, R-II, S-III (C) jaw crusher

(D) P-I, Q-II, R-IV, S-III (D) smooth roll crusher

33. A first-order process having a transfer function, GP = 34. Consider a cylinder (diameter D and length D ), a
2/7s+1 is controlled by a proportional controller with gain sphere (diameter D ) and a cube (side length D ). Which
of 3.2. The process time constant is in minutes. Addition of the following statements concerning the sphericity ( )
of the integral control action with an integral time of the above objects is true:
constant of 5 minutes leads to increase in
(A) ዊ >ዊ >ዊ
sphere cylinder cube
(A) offset (B) ዊ =ዊ =ዊ
sphere cylinder cube
(B) speed of response (C) ዊ ዊ ዊ
sphere cylinder cube
(C) order of the closed loop system (D) ዊ >ዊ =ዊ
cylinder sphere cube
(D) proportional band

35. Time domain function of s / (a2+s2) is given by?

(A) cos at

(B) sin at

(C) cot at

(D) tan at

36. A tank initially contains a gas mixture with 21 mol % oxygen and 79 mol % nitrogen. Pure nitrogen enters the
tank, and a gas mixture of nitrogen and oxygen exits the tank. The molar flow rate Of both the inlet and exit streams
is 8 mol s-l. In addition, use the following data and assumptions -Assume the tank contents to be well mixed - Assume
ideal gas behavior -The temperature and pressure inside the tank are held constant - Molar density of the gas mixture
in the tank is constant at 40 mol m If the volume of the tank is 20 , then the time (in seconds) required for oxygen
content in the tank to decrease to I mol 0/0 is

(A) 100.45

(B) 304.45

(C) 3.445

(D) 10

37. Catalytic cracking is

(A) a hydrogen addition process 38.
(B) a carbon rejection process
(A) positive
(C) an exothermic process
(B) negative
(D) a coking process
(C) real

(D) imaginary

39. The Annual Fixed Charges (AFC) and Annual Utilities Costs (AUC) of a distillation column being designed are
expressed in terms of the reflux ratio (R) as AFC (Rs. Lakh) = 641 x R2 - 1796 x R + 1287 +1/(R -1.16) AUC (Rs. Lakh) =
80 + 62.5 x R The reflux ratio (Ropt) for optimizing the total cost of the distillation column may be found by solving

(A) 1282 x Ropt - 1796 - 1/(Ropt - 1.16)2 = 0

(B) 62.5 + 1282 x Ropt - 1796 - 1/(Ropt - 1.16)2 = 0

(C) 80 + 62.5 x Ropt + R2opt x - 1796 x Ropt + 1287 + 1/(Ropt - 1.16) = 0

(D) 80 + 62.5 x Ropt + R2opt x + 1796 x Ropt - 1287 - 1/(Ropt - 1.16) = 0

40. A U-tube manometer contains two manometric fluids 41.  Which one of the following methods requires
Of densities 1000 kg m-3 and 600 kg m-3. When both the specifying an initial interval containing the root (i.e.,
limbs are open to the atmosphere, the difference bracketing) to obtain the solution of f (x) = O, where f (x)
between the two levels is 10 Cm at equilibrium, as shown is a continuous non-linear algebraic function?
in the figure. The rest Of the manometer is filled with air
(A) Newton-Raphson method
Of negligible density. The acceleration due to gravity is
(B) Regula falsi method
9.81 m s-2and the atmospheric pressure is 100 kPa. How
much absolute pressure (in kPa) has to be applied on the (C) Secant method

limb 'P' to raise the fluid in the limb 'Q' by another 20 (D) fixed point iteration method
cm?

(A) 100.175

(B) 103.924

(C) 547.231

(D) 8206

42. The fourth order Runge-Kutta (RK4) method to solve 43. Which ONE of the following statements is CORRECT?
an ordinary differential equation dy/dx = f(x,y) is given
(A) The major components of biodiesel are triglycerides
as y(x + h) = y(x) + 1/6( k1 + 2k2 + 2k3 + k4 ) k1 =
(B) Biodiesel is essentially a mixture of ethyl esters
hf(x,y) k2 = hf(x + h/2, y + k1/2) k3 = hf(x + h/2, y +
k2/2) k4 = hf(x + h, y + k3) For a special case when the (C) Biodiesel is highly aromatic

function f depends solely on x, the above RK4 method (D) Biodiesel has a very low aniline point
reduces to

(A) Euler’s explicit method

(B) Trapezoidal rule

(C) Euler’s implicit method

(D) Simpson’s 1/3 rule

44. The correct expression for the Colburn j-factor for 45. Match the following
mass transfer that relates Sherwood number (Sh), Group 1 Group 2
Reynolds number (Re) and Schmidt number (Sc) is P Tank in I Non-

(A) Sh(Re)(Sc)1/3 series isothermal
model reaction
(B) Sh(Re)1 / 2(Sc)
Q Liquid-liquid II Mixer-
(C) Sh(Re)1 / 2(Sc)1 / 3
extraction settler
(D) (Sh)/((Re)(Sc))
R Optimum III PFR with
temperature axial mixing
progression

S Thiele IV Solid
modulus catalyzed
reaction

(A) P─II, Q─IV, R─I, S─III

(B) P─I, Q─II, R─III, S─IV

(C) P─III, Q─I, R─II, S─IV

(D) P─III, Q─II, R─I, S─IV

46. An LVDT (Linear Variable Differential Transformer) is
a transducer used for converting
47.
(A) displacement to voltage

(B) voltage to displacement (A) 7.97 to 7.99

(C) resistance to voltage (B) 7.99 to 8.01

(D) voltage to current (C) 7.95 to 7.93

(D) 8.01 to 7.99

48. Pool boiling equipment operating above ambient 49. Liquid phase isomerization of o-xylene to p-xylene
temperature is usually designed to operate using a zeolite catalyst was carried out in a CSTR. Three
sets of kinetic data at different temperatures and stirring
(A) far above the critical heat flux
speeds were obtained as shown below. The operating
(B) near the critical heat flux
condition at which the reaction rate is not controlled by
(C) far above the Leidenfrost point external mass transfer resistance is
(D) near the Leidenfrost point
(A) T = 500 K; rpm = 3000

(B) T = 600 K; rpm = 1000

(C) T = 700 K; rpm = 1000

(D) T = 700 K; rpm = 2000

50. Two film theory applies for absorption of a solute 51. The value of the complex number .i-1 / 2 (where i=√(-
from a gas mixture into a liquid solvent. The interfacial 1)) is
mass transfer coefficient (in mol In-2 s-l) for the gas side
(A) 1√(2)(1-i)
is 0.1 and for the liquid side is 3. The equilibrium
(B) -1√(2) i
relationship is y* = 2x , where x and y* are mole fractions
of the solute in the liquid and gas phases, respectively. (C) 1√(2) i

The ratio Of the mass transfer resistance in the liquid (D) 1√(2)(1+i)
film to the overall resistance is

(A) 0.0161

(B) 0.0322

(C) 0.0625

(D) 0.0645

52. In a steady and incompressible flow of a fluid (density 53. Match the following
= 1.25 kg m-3), the difference between stagnation and Group 1 Group 2
static pressures at the same location in the flow is 30 mm P Turbulence I Reciprocating pump
of mercury (density = 13600 kg m-3). Considering
Q NPSH II Packed bed
gravitational acceleration as 10 ms-2 , the fluid speed (in
R Ergun equation III Fluctuating velocity
ms-1 ) is ______________
S Rotameter IV Impeller
(A) 79 to 82
T Power number V Vena contracta
(B) 82 to 85
(A) P─III, R─II, T─IV
(C) 85 to 83
(B) Q─V, R─II, S─III
(D) 83 to 79
(C) P─III, R─IV, T─II

(D) Q─III, S─V, T─IV

54. The integrating factor for the differential equation dy 55. Carbon monoxide (CO) is burnt in presence of 200%
/ dx - y / 1 + x = (1 + x) is excess pure oxygen and the flame temperature achieved
is 2298 K. The inlet streams are at 25 °C. The standard
(A) 1 / 1 + x
heat of formation (at 25 °C) of CO and CO are ─110 kJ
2
(B) (1 + x)
mol-1 and ─390 kJ mol-1 , respectively. The heat
(C) x(1 + x) capacities (in J mol-1 K-1 ) of the components are C =
po2
(D) x / 1 + x 25 + 14 × 10−3 T C = 25 + 42 × 10 − 3 T where, T is
pco 2
the temperature in K. The heat loss (in kJ) per mole of CO
burnt is_____________

(A) 38.0 to 45.0

(B) 33.0 to 38.0

(C) 32.0 to 38.0

(D) 34.0 to 41.0

56. The bottom face of a horizontal slab of thickness 6 57. In the year 2005, the cost of a shell and tube heat
mm is maintained at 300 ° C. The top face is exposed to a exchanger with 68 m2 heat transfer area was Rs. 12.6
flowing gas at 30 °C. The thermal conductivity of the slab Lakh. Chemical Engineering Index for cost in 2005 was
is 1.5 W m-1 K-1 and the convective heat transfer 509.4 and now the index is 575.4. Based on index of 0.6
coefficient is 30 W m-2 K-1 . At steady state, the for capacity scaling, the present cost (in Lakhs of rupees)
temperature (in °C) of the top face is __________ of a similar heat exchanger having 100 m2 heat transfer
area is estimated to be
(A) 275 to 268

(B) 262 to 268 (A) 17.94

(C) 268 to 262 (B) 19.94

(D) 268 to 274 (C) 20.94

(D) 22.94

59. A vapour phase catalytic reaction (Q + R → S)follows

58. Rideal mechanism (R and S are not adsorbed). Initially,
the mixture contains only the reactants in equimolar
(A) 3 / s4 ratio. The surface reaction step is rate controlling. With

(B) 1/ s2 constants a and b, the initial rate of reaction( - r ) in
o
terms of total pressure (P ) is given by
(C) 2 / s3 T

(D) 2 / s4

(A)

(B)

(C)

(D)

60. Consider the following block diagram for a closed- 61. The thickness of the laminar boundary layer over a
loop feedback control system .A proportional controller is flat plate varies along the distance from the leading edge
being used with K = − 4 . If a step change in disturbance of the plate. As the distance increases, the boundary
c
of magnitude 2 affects the system, then the value of the layer thickness
offset is ____________
(A) increases

(B) decreases

(C) initially increases and then decreases

(D) initially decreases and then increases

(A) 0.47 to 0.51

(B) 0.49 to 0.47

(C) 0.51 to 0.53

(D) 0.49 to 0.51

62. Which of the following statements are CORRECT? P. 63. The combination that correctly matches the process
For a rheopectic fluid, the apparent viscosity increases in Group-1 with the entries in Group-2 is
with time under a constant applied shear stress Q. For a
(A) P-II, Q-IV, R-III, S-I
pseudoplastic fluid, the apparent viscosity decreases
(B) P-III, Q-IV, R-II, S-I
with time under a constant applied shear stress R. For a
Bingham plastic, the apparent viscosity increases (C) P-IV, Q-I, R-II, S-III

exponentially with the deformation rate S. For a dilatant (D) P-II, Q-I, R-IV, S-III
fluid, the apparent viscosity increases with increasing
deformation rate

(A) P and Q only

(B) Q and R only

(C) R and S only

(D) P and S only

64. A spherical storage vessel is quarter–filled with 65. According to the surface renewal theory, the unit of
toluene. The diameter of the vent at the top of the vessel fractional rate of surface renewal is
is 1/20th of the diameter of the vessel. Under the steady
(A) m2 s-2
state condition, the diffusive flux of toluene is maximum
(B) m2 s-1
at
(C) m s-1
(A) the surface of the liquid
(D) s-1
(B) the mid-plane of the vessel

(C) the vent

(D) a distance 20 times the diameter of the vent away from
the vent

ANSWER KEY

1. (B) 2. (C) 3. (A) 4. (C) 5. (B) 6. (C) 7. (A)

8. (D) 9. (A) 10. (C) 11. (B) 12. (B) 13. (D) 14. (D)

15. (B) 16. (D) 17. (D) 18. (A) 19. (A) 20. (C) 21. (C)

22. (A) 23. (C) 24. (B) 25. (D) 26. (A) 27. (D) 28. (A)

29. (B) 30. (C) 31. (C) 32. (A) 33. (C) 34. (A) 35. (A)

36. (B) 37. (B) 38. (C) 39. (B) 40. (B) 41. (B) 42. (D)

43. (B) 44. (A) 45. (D) 46. (A) 47. (B) 48. (B) 49. (A)

50. (C) 51. (A) 52. (A) 53. (A) 54. (A) 55. (C) 56. (D)

57. (A) 58. (D) 59. (C) 60. (D) 61. (A) 62. (D) 63. (B)

64. (C) 65. (D)