Firstranker's choice
GATE 2018
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Q. 1 – Q. 5 carry one mark each.
Q.1 "When she fell down the __________ she received many __________ but little help.”
The words that best fill the blanks in the above sentence are
(A) stairs, stares (B) stairs, stairs
(C) stares, stairs (D) stares, stares
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Q.2 "In spite of being warned repeatedly, he failed to correct his __________ behaviour."
The word that best fills the blank in the above sentence is
(A) rational (B) reasonable
(C) errant (D) good
Q.3 For 0 = x = 2p, sin x and cos x are both decreasing functions in the interval
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(A)
Q.4 Arrange the following three-dimensional objects in the descending order of their volumes:
(i) A cuboid with dimensions 10 cm, 8 cm and 6 cm
(ii) A cube of side 8 cm
(iii) A cylinder with base radius 7 cm and height 7 cm
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(iv) A sphere of radius 7 cm
(A) (i), (ii), (iii), (iv) (B) (ii), (i), (iv), (iii)
(C) (iii), (ii), (i), (iv) (D) (iv), (iii), (ii), (i)
Q. 6 – Q. 10 carry two marks each.
Q.6 An automobile travels from city A to city B and returns to city A by the same route. The speed of the vehicle during the onward and return journeys were constant at 60 km/h and 90 km/h, respectively. What is the average speed in km/h for the entire journey?
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(A) 72 (B) 73
(C) 74 (D) 75
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GATE 2018
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Q.7 A set of 4 parallel lines intersect with another set of 5 parallel lines. How many parallelograms are formed?
(A) 20 (B) 48
(C) 60 (D) 72
Q.8 To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 candidates. Question B was answered correctly by 2,50,000 candidates. Question C was answered correctly by 2,60,000 candidates. Both questions A and B were answered correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. If the number of students answering all questions correctly is the same as the number answering none, how many candidates failed to clear the test?
(A) 30,000 (B) 2,70,000
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(C) 3,90,000 (D) 4,20,000
Q.9 If x2 + x - 1 = 0 what is the value of x4 + 1/x4 ?
(A) 1 (B) 5
(C) 7 (D) 9
Q.10 In a detailed study of annual crow births in India, it was found that there was relatively no growth during the period 2002 to 2004 and a sudden spike from 2004 to 2005. In another unrelated study, it was found that the revenue from cracker sales in India which remained fairly flat from 2002 to 2004, saw a sudden spike in 2005 before declining again in 2006. The solid line in the graph below refers to annual sale of crackers and the dashed line refers to the annual crow births in India. Choose the most appropriate inference from the above data.
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Annual sale of crackers in India
2001 2003 2005 2007
Annual crow births in India
(A) There is a strong correlation between crow birth and cracker sales.
(B) Cracker usage increases crow birth rate.
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(C) If cracker sale declines, crow birth will decline.
(D) Increased birth rate of crows will cause an increase in the sale of crackers.
END OF THE QUESTION PAPER
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Firstranker's choice
GATE 2018
Q. 1 – Q. 25 carry one mark each.
Q.1 The major product formed in the following reaction is
H
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H
O=C + CI
CI
(A)
H
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CI
CI
(C)
H
I
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?
Q.2
H
?
H
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H
CICI
(B)
H
H
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?
?
H
?
CICI
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(D)
?
H
?
The major product formed in the following reaction is
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I
ICO2E+CHO + NH3
pH 8.5
2 equiv
(A)
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EtO2C.
CO2Et
N
(C)
EtO2C
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ZI
CI
CI
EtO2C
N CO2Et
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(D)
EtO2C.
CO2Et
IN
CO2Et
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CY
Firstranker's choice
GATE 2018
Q.3 The major product of the following intramolecular cycloaddition reaction is
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(A)
?
hv
(B)
?
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(C)
(D)
?
?
Q.4 The major product of the following reaction is
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(A)
(C)
SiMe3
?
OH
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KH
B
SiMe3
Firstranker's choice
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GATE 2018
Q.5 The major product formed in the following reaction sequence is
CY
Q.6
(A)
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?
1. LDA, -78 °C
2. PhSeCl
3. ?2?2, ?
(B)
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?
(C)
(D)
?
SePh
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PhSe
The major product formed in the following reaction sequence is
1. HO2C
-SO2N3
NH
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?
CO2Bn
2. Rh2(OAc)4
(A)
?
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?
-N
?
CO2Bn
CO2Bn
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(C)
(D)
?
NH
N3
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CO2Bn
N
?
?
Q.7 The spherical harmonic function, Yl,m (?,f), with appropriate values of l and m, is an eigenfunction of Lx2 + Ly2 operator. The corresponding eigenvalue is
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(A) (l(l+1)-m2)h2
(B) (l(l+1)+m2)h2
(C) l(l+1)h2
(D) m2h2
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Firstranker's choice
GATE 2018
Q.8 Consider the operators, â+ = 1/v2(x+ipx) and â- = 1/v2(x-ipx), where x and px are the position and linear momentum operators, respectively. The commutator, [â+ , â- ] is equal to
CY
Q.9
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(A) ih
(B) -ih
(C) h
(D) –h
The temperature derivative of electrochemical cell potential E at constant pressure, (?E/?T)P , is given by
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(A) ?S/nF
(B) -?S/nF
(C) ?S/nFT
(D) -?S/nFT
Q.10 For an ionic micelle-forming surfactant near its critical micelle concentration (CMC), the dependence of molar conductivity and surface tension on surfactant concentration is best represented by
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(A)
(B)
Physical Properties
CMC
Molar Conductivity
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Surface Tension
Surfactant Concentration
Molar Conductivity
Surface Tension
Surfactant Concentration
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(C)
(D)
Physical Properties
CMC
Molar Conductivity
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Surface Tension
Surfactant Concentration
Molar Conductivity
Surface Tension
CMC
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Surfactant Concentration
Q.11 According to Eyring transition state theory for a bimolecular reaction, the activated complex has
(A) no vibrational degrees of freedom.
(B) vibrational degrees of freedom but they never participate in product formation.
(C) one high frequency vibration that leads to product formation.
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(D) one low frequency vibration that leads to product formation.
Firstranker's choice
CY
GATE 2018
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Q.12 Based on Wade's rule, the structure-type of [B5H8]- is
(A) closo
(B) nido
(C) arachno
(D) hypho
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Q.13 The coordination geometries around the copper ion of plastocyanin (a blue-copper protein) in oxidized and reduced form, respectively, are
(A) tetrahedral and square-planar
(B) square-planar and tetrahedral
(C) distorted tetrahedral for both
(D) ideal tetrahedral for both
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Q.14 The water exchange rates for the complex ions follow the order
(A) [V(H2O)6]2+ > [Co(H2O)6]2+ > [Cr(H2O)6]3+
(B) [Cr(H2O)6]3+ > [Co(H2O)6]2+ > [V(H2O)6]2+
(C) [Co(H2O)6]2+ > [Cr(H2O)6]3+ > [V(H2O)6]2+
(D) [Co(H2O)6]2+ > [V(H2O)6]2+ > [Cr(H2O)6]3+
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Q.15 The lowest energy d ? d transition of the complexes follow the order
(A) [Cr(H2O)6]3+ < [Cr(NH3)6]3+ < [Cr(CN)6]3-
(B) [Cr(CN)6]3- < [Cr(NH3)6]3+ < [Cr(H2O)6]3+
(C) [Cr(CN)6]3- < [Cr(H2O)6]3+ < [Cr(NH3)6]3+
(D) [Cr(NH3)6]3+ < [Cr(CN)6]3- < [Cr(H2O)6]3+
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Q.16 The symmetry label of valence p orbitals of a metal ion in an octahedral ligand field is
(A) t1g
(B) t1u
(C) eg + a1g
(D) t2g
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Q.17 The bond angle (Ti-C-C) in the crystal structure of {(CH3)2P(CH2)2P(CH3)2}Cl3TiCH2CH2H
86°
is severely distorted due to
(A) hydrogen-bonding interaction
(B) agostic interaction
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(C) steric bulk of the phosphine ligand
(D) higher formal charge on metal
Q.18 The molar heat capacity of a substance is represented in the temperature range 298 K to 400 K by the empirical relation Cm =14+bT JK-1 mol-1, where b is a constant. The molar enthalpy change when the substance is heated from 300 K to 350 K is 2 kJ mol-1. The value of b is __________ J K-2 mol-1. (Up to two decimal places)
Firstranker's choice
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GATE 2018
Q.19 For low partial pressure of ozone (O3), the adsorption of ozone on graphite surface is fully dissociative in nature, and follows Langmuir isotherm. Under these conditions, if the dependence of the surface coverage of graphite (?) on partial pressure of ozone (PO3) is given by ? ? (PO3)x, the value of x is __________ . (Up to two decimal places)
Q.20 For the radioactive isotope 131I, the time required for 50% disintegration is 8 days. The time required for the 99.9% disintegration of 5.5 g of 131I is __________ days. (Up to one decimal place)
Q.21 Two moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under isothermal-isobaric condition. The entropy change on mixing is __________ J K-1. (Up to one decimal place. Use R = 8.31 J K-1 mol-1)
Q.22 The energy of a hydrogen molecule in its ground state equilibrium configuration is –31.7 eV. Its dissociation energy is __________ eV. (Up to one decimal place)
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Q.23 The total number of valence electrons in W(?3-Cp)(?5-Cp)(CO)2 is __________. (Atomic number of W = 74)
Q.24 In the 1H NMR spectrum of an organic compound recorded on a 300 MHz instrument, a proton resonates as a quartet at d 4.20 ppm. The individual signals of the quartet appear at d 4.17, 4.19, 4.21 and 4.23 ppm. The coupling constant J in Hz is __________ .
Q.25 In the electron ionization mass spectra, methyl hexanoate, methyl heptanoate and methyl octanoate give the same base peak. The m/z value of the base peak is __________ .
CY
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Firstranker's choice
GATE 2018
Q. 26 – Q. 55 carry two marks each.
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Q.26 In the following reaction,
CH3
Si(CH3)3
CH3
CH3
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+
Ph
Ph
Ph
TiCl4
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H
OH
X
OH
Y
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(A) X is the major product and Y is the minor product
(B) X is the only product
(C) Y is the only product
(D) X is the minor product and Y is the major product
Q.27 The enantiomeric pair, among the following, is
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(A)
(B)
CH3
CH3
H
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CI
H
and
and
CI
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H
H/,,,
CI
CI
CH3
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CH3
(C)
(D)
CO2H
O2N
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and
and
HO2C
?
Q.28 The major product formed in the lowing reaction sequence is
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SFSO3
T
1.
2. Raney-Ni, A
NO2
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and
O2N
CO2H
NO2
HO2C
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CY
(A)
?
?
(B)
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(C)
?
?
(D)
?
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?
Firstranker's choice
GATE 2018
Q.29 The major product in the following reaction sequence is
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1. mCPBA, NaHCO3
MeO
2. NaOH, H2O
3. I2, KI, NaHCO3, H2O
(A)
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?
(B)
H
MeO
OH
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(C)
MeO
HO
OMe
HO,
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(D)
H
MeO
HO,,
Q.30 The major product formed in the following reaction sequence is
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CO2Me
(A)
?
(C)
HO
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OH
1. CF3CO2H
2. BH3 (1 equiv)
(B)
HO
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OH
(D)
HO
CO2Me
CY
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Firstranker's choice
GATE 2018
Q.31 The major product of the following reaction sequence is
Br
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N
Me
1.
SnBu3, Pd(PPh3)4
N
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Boc
2. toluene, A
(A)
N
Me
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(B)
Br
N
Me
N
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Boc
N
Boc
(C)
(D)
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N
Mé
?
N
Boc
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N
Me
N-Boc
Q.32 The major product formed in the following retro-aldol reaction is
TsOH, 50% aq. dioxane
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OH
OH
(A)
HO
OHC
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(B)
H
OHC
HO
?
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H
(C)
(D)
CHO
HO
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CY
?
OHC
HO
?
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Firstranker's choice
GATE 2018
Q.33 The elimination product of the following reaction is
CY
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CH3
CO
'Rh
CO (35 bar)
453 K
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CO
(A) I2
(B) CH3I
(C) CH3COI
(D) 13
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Q.34 A one-dimensional anharmonic oscillator is treated by perturbation theory. The harmonic oscillator is used as the unperturbed system and the perturbation is 1/6 ?x3 (? is a constant). Using only the first order correction, the total ground state energy of the anharmonic oscillator is
(Note: For a one-dimensional harmonic oscillator ?(x) = (a/p)1/4 e-ax2; a = v(kµ)/h )
(A) -h v(k/µ)/2
(B) h v(k/µ)/2
(C)+
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(D)+
1/2
1/4
1/2
1/2
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1
k
6
µ
k
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6 µ
1
k
µ
h
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212
µ
Q.35 The O2 coordinated to metal ion centres in oxy-myoglobin and oxy-hemocyanin exists, respectively, as
(A) superoxide and peroxide
(B) superoxide and superoxide
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(C) peroxide and peroxide
(D) superoxide and oxygen
Q.36 Spectroscopic ground state term symbols of cobalt ions in [Co(H2O)6]2+ and [CoCl4]2-, respectively, are
(A) 2T1g and 4A2
(B) 4T1g and 4A2
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(C) 4T2g and 4T1
(D) 2T1 and 4A1
Q.37 Generally, the coordination number and the nature of the electronic absorption band (f? f transition) of lanthanide(III) ion in their complexes are, respectively,
(A) greater than 6 and sharp
(B) 6 and broad
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(C) less than 6 and sharp
(D) greater than 6 and broad
Firstranker's choice
GATE 2018
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Q.38 Second-order rate constant for the reaction between [Co(NH3)5X]n+ (n = 3 for X = NH3 and H2O; n = 2 for X = Cl-) and [Cr(H2O)6]2+ at room temperature varies with the X as
(A) NH3 > H2O > Cl-
(B) Cl-> H2O > NH3
(C) NH3 > Cl- > H2O
(D) H2O > NH3 > Cl-
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Q.39 For the following reaction sequence,
1. ?, C6H5Cl
3 NH4Cl + 3 BCl3 ? X
2. LiBH4
3 H2O
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RT
Y
X and Y, respectively, are
(A) {HB(NH)}3 and {H(OH)B(NH2)}3
(B) {HB(NH)}3 and {HB(NH2OH)}3
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(C) (NH4){(H)2(BH2)3} and {H(OH)(NH2OH)}3
(D) (NH4){(H)2(BH2)3} and {HB(NH2OH)}3
Q.40 For an inverse spinel, AB2O4, the A and B, respectively, can be
(A) Ni(II) and Ga(III)
(B) Zn(II) and Fe(III)
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(C) Fe(II) and Cr(III)
(D) Mn(II) and Mn(III)
Q.41 The reaction of PCl3 with PhLi in 1:3 molar ratio yields X as one of the products, which on further treatment with CH3I gives Y. The reaction of Y with n-BuLi gives product Z. The products X, Y and Z, respectively, are
(A) [PPh4]Cl, [Ph2P=CH2] and Ph2P(n-Bu)3
(B) PPh3, [Ph3PI](CH3) and Ph2P(n-Bu)3
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(C) PPh3, [Ph3P(CH3)]I and Ph3P=CH2
(D) [PPh4]Cl, [Ph3P=CH2] and [Ph3P(n-Bu)]Li
Q.42 The reaction of equimolar quantities of Fe(CO)5 and OH- gives a complex species X which on further reaction with MnO2 gives species Y. X and Y, respectively, are
(A) [Fe(CO)5(OH)]- and Fe2(CO)9
(B) [Fe(CO)4]2- and Mn2(CO)10
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(C) [HFe(CO)4]- and Fe2O3
(D) [HFe(CO)4] and Fe3(CO)12
Q.43 The rate constant of a first order reaction, X?Y, is 1.6 × 10-3 s-1 at 300 K. Given that the activation energy of the reaction is 28 kJ mol-1 and assuming Arrhenius behavior for the temperature dependence, the total time required to obtain 90% of Y at 350 K is __________ s. (Up to one decimal place. Use R = 8.31 J K-1 mol-1 )
CY
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Q.44 The molar conductivity of a 0.01 M weak acid (HX) at 298 K, measured in a conductivity cell with cell constant of 0.4 cm-1, is 64.4 S cm2 mol-1. The limiting molar conductivities at infinite dilution of H+ and X- at 298 K are 350 and 410 S cm2 mol-1, respectively. Ignoring activity coefficients, the pKa of HX at 298 K is __________ (Up to two decimal places)
Q.45 The Latimer diagram of oxygen is given below. The value of x is __________ V. (Up to two decimal places)
+ 0.70 V
+ 1.76 V
O2 ? H2O2 ? H2O
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xV
Q.46 At temperature T, the canonical partition function of a harmonic oscillator with fundamental frequency (v) is given by
qvib (T) = e-hv/2kBT / (1-e-hv/kBT)
For hv/kBT = 3, the probability of finding the harmonic oscillator in its ground vibrational state is __________ (Up to two decimal places)
Q.47 The enthalpy of vaporization of a liquid at its boiling point (Tb = 200 K) is 15.3 kJ mol-1. If the molar volumes of the liquid and the vapour at 200 K are 110 and 12000 cm3 mol-1, respectively, then the slope dP/dT of the liquid-vapour boundary is __________ kPa K-1. (Up to two decimal places. Note: 1 Pa =1Jm-3)
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Q.48 In a molecule XY, let ?x and ?y denote normalized atomic orbitals of atoms X and Y, respectively. A normalized molecular orbital of XY is given by ?1 =0.56(?x+?y). The value of the overlap integral of ?x and ?y is __________ (Up to two decimal places)
CY
Firstranker's choice
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GATE 2018
Q.49 The absorption maxima of two dyes X and Y are 520 and 460 nm, respectively. The absorbance data of these dyes measured in a 1 cm path length cell are given in the table below.
Dye solution Absorbance at 460 nm Absorbance at 520 nm
X (9 mM) 0.144 0.765
Y (12 mM) 0.912 0.168
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Mixture of X and Y 0.700 0.680
The concentration of Y in the mixture is __________ mM. (Up to two decimal places)
Q.50 The p electrons in benzene can be modelled as particles in a ring that follow Pauli's exclusion principle. Given that the radius of benzene is 1.4 Å, the longest wavelength of light that is absorbed during an electronic transition in benzene is __________ nm. (Up to one decimal place. Use m =9.1×10-31 kg, h=6.6×10-34 Js, c=3.0×108 m s-1)
Q.51 The spacing between the two adjacent lines of the microwave spectrum of H35Cl is 6.35 × 1011 Hz. Given that the bond length of D35Cl is 5% greater than that of H35Cl, the corresponding spacing for D35Cl is __________ × 1011 Hz. (Up to two decimal places)
Q.52 For a diatomic vibrating rotor, in vibrational level v = 3 and rotational level J, the sum of the rotational and vibrational energies is 11493.6 cm-1. Its equilibrium oscillation frequency is 2998.3 cm-1, anharmonicity constant is 0.0124 and rotational constant under rigid rotor approximation is 9.716 cm-1. The value of J is __________ (Up to nearest integer)
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Q.53 Number of carbonyl groups present in the final product of the following reaction sequence is __________
1. O3, H2O2
+
2. ?3?, ?
CY
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Q.54 A tetrapeptide, made up of natural amino acids, has alanine as the N-terminal residue which is coupled to a chiral amino acid. Upon complete hydrolysis, the tetrapeptide gives glycine, alanine, phenylalanine and leucine. The number of possible sequences of the tetrapeptide is __________
This download link is referred from the post: GATE Previous Last 10 Years 2010-2020 Question Papers With Solutions And Answer Keys
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