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JEE Main 22 January 2025 Shift 1 Question Paper with Answers

22 January 2025 · January session · 73 questions

73 of the 75 questions from the JEE Main 22 January 2025 Shift 1 paper, each with its correct answer and tagged to the chapter it tests. Free to read, no account needed.

2 questions are held back from this paper while we re-check the transcription or the answer key. We would rather show you nothing than show you an answer we are not confident is right.

Physics
23
Chemistry
25
Mathematics
25

Physics — JEE Main 22 January 2025 Shift 1

Q1·Physics·Experimental SkillsSingle correct
Given below are two statements. Statement I: In a vernier callipers, one vernier scale division is always smaller than one main scale division. Statement II: The vernier constant is given by one main scale division multiplied by the number of vernier scale divisions. In the light of the above statements, choose the correct answer:
  1. (A)Both Statement I and Statement II are true
  2. (B)Statement I is true but Statement II is false
  3. (C)Both Statement I and Statement II are false
  4. (D)Statement I is false but Statement II is true

Correct answer: (B)

Step-by-step solution →
Q2·Physics·Electric Field and Coulomb's LawSingle correct
A line charge of length a/2 is kept at the centre of an edge BC of a cube ABCDEFGH having edge length a (see figure). If the linear charge density of the line is λ C per unit length, then the total electric flux through all the faces of the cube is: (take ε₀ = free-space permittivity)
  1. (A)λa/8ε₀
  2. (B)λa/16ε₀
  3. (C)λa/2ε₀
  4. (D)λa/4ε₀

Correct answer: (A)

Step-by-step solution →
Q3·Physics·Current ElectricitySingle correct
The sliding contact of a potentiometer is in the middle of the potentiometer wire, which has resistance R_w = 1Ω, as shown in the figure. An external resistance R_e = 2Ω is connected via the sliding contact. The source emf is 0.9 V. The current i drawn from the source is:
  1. (A)0.3 A
  2. (B)1.35 A
  3. (C)1.0 A
  4. (D)0.9 A

Correct answer: (C)

Step-by-step solution →
Q4·Physics·Wave OpticsSingle correct
Assertion (A): If Young’s double-slit experiment is performed in an optically denser medium than air, the consecutive fringes come closer. Reason (R): The speed of light reduces in an optically denser medium than air, while its frequency does not change. In the light of the above statements, choose the most appropriate answer:
  1. (A)Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. (B)(A) is false but (R) is true
  3. (C)Both (A) and (R) are true but (R) is not the correct explanation of (A)
  4. (D)(A) is true but (R) is false

Correct answer: (A)

Step-by-step solution →
Q5·Physics·ThermodynamicsSingle correct
Two spherical bodies of the same material having radii 0.2 m and 0.8 m are placed in the same atmosphere. The temperature of the smaller body is 800 K and that of the bigger body is 400 K. If the energy radiated from the bigger body is E, the energy radiated from the smaller body (effect of the surroundings being negligible) is:
  1. (A)256E
  2. (B)E
  3. (C)64E
  4. (D)16E

Correct answer: (B)

Step-by-step solution →
Q6·Physics·Atoms and NucleiSingle correct
An electron is in the orbital radius 5.3×10⁻¹¹ m (ground state) of a hydrogen atom. The ratio of the de Broglie wavelength of the electron in the 3rd excited state to that in the ground state is:
  1. (A)4
  2. (B)9
  3. (C)3
  4. (D)16

Correct answer: (A)

Step-by-step solution →
Q7·Physics·Geometrical OpticsSingle correct
In the arrangement shown in the figure there are three lenses formed by water (μ = 4/3) and glass (μ = 3/2) at the boundaries of a container; the thickness of glass is negligible compared to |R₁| and |R₂|, the radii of curvature of the upper and lower glass surfaces. The power of the combination is:
  1. (A)−(1/6)(1/|R₁| + 1/|R₂|)
  2. (B)−(1/6)(1/|R₁| − 1/|R₂|)
  3. (C)(1/6)(1/|R₁| + 1/|R₂|)
  4. (D)(1/6)(1/|R₁| − 1/|R₂|)

Correct answer: (B)

Step-by-step solution →
Q8·Physics·Current ElectricitySingle correct
Which of the following resistivity (ρ) versus temperature (T) curves is most suitable to be used in wire-bound standard resistors? (graphs (1)–(4) shown)
  1. (A)(1)
  2. (B)(2)
  3. (C)(3)
  4. (D)(4)

Correct answer: (A)

Step-by-step solution →
Q9·Physics·WavesSingle correct
A closed organ pipe and an open organ pipe are filled with two different gases having the same bulk modulus but different densities ρ₁ and ρ₂ respectively. The frequency of the 9th harmonic of the closed pipe is identical with the 4th harmonic of the open pipe. If the length of the closed pipe is 10 cm and the density ratio of the gases is ρ₁ : ρ₂ = 1 : 16, the length of the open pipe is:
  1. (A)20/7 cm
  2. (B)15/7 cm
  3. (C)20/9 cm
  4. (D)15/9 cm

Correct answer: (C)

Step-by-step solution →
Q10·Physics·Rotational MotionSingle correct
A uniform circular disc of radius R and mass M is rotating about an axis perpendicular to its plane and passing through its centre. A small circular part of radius R/2 is removed from the original disc as shown in the figure (its boundary passes through the centre). The moment of inertia of the remaining part about the same axis is:
  1. (A)7/32 MR²
  2. (B)9/32 MR²
  3. (C)17/32 MR²
  4. (D)13/32 MR²

Correct answer: (D)

Step-by-step solution →
Q11·Physics·GravitationSingle correct
A small point mass m is placed at a distance 2R from the centre O of a big uniform solid sphere of mass M and radius R. The gravitational force on m due to M is F₁. A spherical part of radius R/3 is removed from the big sphere (on the side nearer to m, as shown) and the force on m due to the remaining part of M is F₂. The ratio F₁ : F₂ is:
  1. (A)16 : 9
  2. (B)11 : 10
  3. (C)12 : 11
  4. (D)12 : 9

Correct answer: (C)

Step-by-step solution →
Q12·Physics·Dual Nature of Matter and RadiationSingle correct
The work functions of caesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV respectively. For light of wavelength 550 nm, the photoelectric effect is possible for the case of:
  1. (A)Li only
  2. (B)Cs only
  3. (C)Neither Cs nor Li
  4. (D)Both Cs and Li

Correct answer: (B)

Step-by-step solution →
Q13·Physics·Units and MeasurementsSingle correct
If B is the magnetic field and μ₀ is the permeability of free space, then the dimensions of (B/μ₀) are:
  1. (A)M T⁻¹ A⁻¹
  2. (B)L⁻¹ A
  3. (C)L T⁻¹ A⁻¹
  4. (D)M L T⁻¹ A⁻¹

Correct answer: (B)

Step-by-step solution →
Q14·Physics·Work, Energy and PowerSingle correct
A bob of mass m is suspended at a point O by a light string of length l and left to perform vertical circular motion. Initially, by applying horizontal velocity v_a at the lowest point A, the string becomes slack at the topmost point D. The ratio of the kinetic energy of the bob at the points B and C (shown in the figure, at heights l/2 and 3l/2 above A) is:
  1. (A)2
  2. (B)1
  3. (C)4
  4. (D)3

Correct answer: (A)

Step-by-step solution →
Q15·Physics·Current ElectricitySingle correct
Given below are two statements. Statement I: The equivalent emf of two non-ideal batteries connected in parallel is smaller than either of the two emfs. Statement II: The equivalent internal resistance of two non-ideal batteries connected in parallel is smaller than either of the internal resistances of the two batteries. In the light of the above statements, choose the correct answer:
  1. (A)Statement I is true but Statement II is false
  2. (B)Both Statement I and Statement II are true
  3. (C)Both Statement I and Statement II are false
  4. (D)Statement I is false but Statement II is true

Correct answer: (D)

Step-by-step solution →
Q16·Physics·Electronic DevicesSingle correct
Which of the following circuits represents a forward-biased diode? (See figure for circuits (A)–(E) with their node potentials and diode orientations.)
  1. (A)(B), (D) and (E) only
  2. (B)(A) and (D) only
  3. (C)(B), (C) and (E) only
  4. (D)(C) and (E) only

Correct answer: (C)

Step-by-step solution →
Q17·Physics·Capacitors and DielectricsSingle correct
A parallel-plate capacitor of capacitance 40 μF is connected to a 100 V power supply. Now the intermediate space between the plates is filled with a dielectric material of dielectric constant K = 2. Due to the introduction of the dielectric, the extra charge and the change in the electrostatic energy of the capacitor, respectively, are:
  1. (A)3 mC and 0.2 J
  2. (B)8 mC and 2.0 J
  3. (C)4 mC and 0.2 J
  4. (D)2 mC and 0.2 J

Correct answer: (C)

Step-by-step solution →
Q18·Physics·Geometrical OpticsSingle correct
Given is a thin convex lens of glass (refractive index μ) and both faces having radius of curvature R. It is silvered on one side to behave like a closed reflector. An object is placed on the optic axis so that the image gets formed on the object itself. The object distance is:
  1. (A)R/μ
  2. (B)R(2μ−3)
  3. (C)R(2μ−1)
  4. (D)R/(2μ−1)

Correct answer: (D)

Step-by-step solution →
Q19·Physics·Properties of Solids and LiquidsInteger
Two soap bubbles of radius 2 cm and 4 cm are in contact with each other. The radius of curvature of the common surface, in cm, is ______.

Correct answer: 4

Step-by-step solution →
Q20·Physics·Geometrical OpticsInteger
The driver sitting inside a parked car is watching vehicles approaching from behind with the help of a convex side mirror of radius of curvature R = 2 m. A vehicle approaches from behind with a uniform speed of 90 km/h. When the vehicle is at a distance of 24 m, the magnitude of the acceleration of its image is a₀ m/s². The value of 100 a₀ is ______.

Correct answer: 8

Step-by-step solution →
Q21·Physics·ThermodynamicsInteger
Three conductors of the same length having thermal conductivities k₁, k₂ and k₃ are connected as shown in the figure (a 100°C end joined through the 1st conductor to a junction, then the 2nd conductor to a 0°C end, with the 3rd conductor also bridging the junction to 0°C). The area of cross-section of the 1st and 2nd conductors is A and that of the 3rd conductor is 2A. With k₁ = 60 J s⁻¹m⁻¹K⁻¹, k₂ = 120 J s⁻¹m⁻¹K⁻¹ and k₃ = 135 J s⁻¹m⁻¹K⁻¹, the temperature θ (°C) of the junction is ______.

Correct answer: 40

Step-by-step solution →
Q22·Physics·Rotational MotionInteger
The position vectors of two 1 kg particles A and B are given by r_A = (α₁t i + α₂t j + α₃t k) m and r_B = (β₁ i + β₂t² j + β₃t k) m, where (α₁ = 1, α₂ = 3 m/s, α₃ = 2 m/s) and (β₁ = 1 m, β₂ = ... , β₃ = ... ) are constants, with t in seconds. At t = 1 s the magnitude of the angular momentum of particle B with respect to the position of particle A is √L kg m²/s. The value of L is ______.

Correct answer: 90

Step-by-step solution →
Q23·Physics·KinematicsInteger
A particle is projected at an angle of 30° from the horizontal at a speed of 60 m/s. The height traversed by the particle in the first second is h₁ and the height traversed in the last second of its upward journey is h₂. The ratio h₁ : h₂ is ______. (take g = 10 m/s²)

Correct answer: 5

Step-by-step solution →

Chemistry — JEE Main 22 January 2025 Shift 1

Q24·Chemistry·Redox Reactions and ElectrochemistrySingle correct
A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A. The amount of aluminium deposited at the cathode is ______. (Given: molar masses of aluminium and chlorine are 27 g mol⁻¹ and 35.5 g mol⁻¹ respectively; Faraday constant = 96500 C mol⁻¹)
  1. (A)1.660 g
  2. (B)1.007 g
  3. (C)0.336 g
  4. (D)0.441 g

Correct answer: (C)

Step-by-step solution →
Q25·Chemistry·Chemical KineticsSingle correct
Which of the following statements is NOT true for radioactive decay?
  1. (A)The amount of radioactive substance remaining after three half-lives is 1/8th of the original amount
  2. (B)The decay constant does not depend upon temperature
  3. (C)The decay constant increases with increase in temperature
  4. (D)Half-life is 0.693 times (1/rate constant)

Correct answer: (C)

Step-by-step solution →
Q26·Chemistry·IsomerismSingle correct
How many different stereoisomers are possible for the molecule hex-3-en-2-ol, CH₃–CH(OH)–CH=CH–CH₂–CH₃ ?
  1. (A)3
  2. (B)1
  3. (C)2
  4. (D)4

Correct answer: (D)

Step-by-step solution →
Q27·Chemistry·Classification of Elements and Periodicity in PropertiesSingle correct
Which of the following electronegativity orders is INCORRECT?
  1. (A)Al < Mg < B < N
  2. (B)Al < Si < C < N
  3. (C)Mg < Be < B < N
  4. (D)S < Cl < O < F

Correct answer: (A)

Step-by-step solution →
Q28·Chemistry·d- and f-Block ElementsSingle correct
Lanthanoid ions with 4f⁷ configuration are: (A) Eu²⁺ (B) Gd³⁺ (C) Eu³⁺ (D) Tb³⁺ (E) Sm²⁺. Choose the correct answer from the options given below:
  1. (A)(A) and (B) only
  2. (B)(A), (B) and (E) only
  3. (C)(B) and (E) only
  4. (D)(B) and (D) only

Correct answer: (A)

Step-by-step solution →
Q29·Chemistry·Classification of Elements and Periodicity in PropertiesSingle correct
Match List-I (Increasing Order of Species) with List-II (Property). Choose the correct answer from the options given below:
List-I (Increasing Order of Species)List-II (Property)
A.Al³⁺ < Mg²⁺ < Na⁺ < F⁻I.Ionisation Enthalpy
B.B < C < O < NII.Metallic character
C.B < Al < Mg < KIII.Electronegativity
D.Si < P < S < ClIV.Ionic radii
  1. (A)A-IV, B-I, C-III, D-II
  2. (B)A-III, B-II, C-IV, D-I
  3. (C)A-IV, B-I, C-II, D-III
  4. (D)A-II, B-III, C-IV, D-I

Correct answer: (C)

Step-by-step solution →
Q30·Chemistry·BiomoleculesSingle correct
Which of the following acids is a vitamin?
  1. (A)Adipic acid
  2. (B)Aspartic acid
  3. (C)Ascorbic acid
  4. (D)Saccharic acid

Correct answer: (C)

Step-by-step solution →
Q31·Chemistry·Chemical ThermodynamicsSingle correct
A liquid kept inside a thermally insulated closed vessel at 25°C is mechanically stirred from outside. What is the correct option for the following thermodynamic parameters?
  1. (A)ΔU > 0, q = 0, w > 0
  2. (B)ΔU = 0, q = 0, w = 0
  3. (C)ΔU > 0, q = 0, w < 0
  4. (D)ΔU < 0, q = 0, w > 0

Correct answer: (A)

Step-by-step solution →
Q32·Chemistry·Atomic StructureSingle correct
The radius of the first excited state of a helium ion (He⁺) is given as ______, where a₀ = radius of the first stationary state of the hydrogen atom.
  1. (A)a₀/2
  2. (B)a₀/4
  3. (C)4a₀
  4. (D)2a₀

Correct answer: (D)

Step-by-step solution →
Q33·Chemistry·Organic Compounds Containing HalogensSingle correct
Given below are two statements. Statement I: CH₃–O–CH₂–Cl will undergo SN1 reaction though it is a primary halide. Statement II: (CH₃)₃C–CH₂–Cl will not undergo SN2 reaction very easily though it is a primary halide. In the light of the above statements, choose the most appropriate answer:
  1. (A)Statement I is incorrect but Statement II is correct
  2. (B)Both Statement I and Statement II are incorrect
  3. (C)Statement I is correct but Statement II is incorrect
  4. (D)Both Statement I and Statement II are correct

Correct answer: (D)

Step-by-step solution →
Q34·Chemistry·HydrocarbonsSingle correct
Given below are two statements. Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of H₂ gas. Statement II: Four grams of propyne reacts with NaNH₂ to liberate NH₃ gas which occupies 224 mL at STP. In the light of the above statements, choose the most appropriate answer:
  1. (A)Statement I is correct but Statement II is incorrect
  2. (B)Both Statement I and Statement II are correct
  3. (C)Statement I is incorrect but Statement II is correct
  4. (D)Both Statement I and Statement II are incorrect

Correct answer: (A)

Step-by-step solution →
Q35·Chemistry·EquilibriumSingle correct
A vessel at 1000 K contains CO₂ at a pressure of 0.5 atm. Some of the CO₂ is converted into CO on addition of graphite. If the total pressure at equilibrium is 0.8 atm, then Kp is:
  1. (A)0.18 atm
  2. (B)1.8 atm
  3. (C)0.3 atm
  4. (D)3 atm

Correct answer: (B)

Step-by-step solution →
Q36·Chemistry·IUPAC NomenclatureSingle correct
The IUPAC name of the compound shown is:
  1. (A)1,2-Carboxy-5-methoxycarbonylhexane
  2. (B)Methyl-6-carboxy-2,5-dimethylhexanoate
  3. (C)Methyl-5-carboxy-2-methylhexanoate
  4. (D)6-Methoxycarbonyl-2,5-dimethylhexanoic acid

Correct answer: (D)

Step-by-step solution →
Q37·Chemistry·Redox Reactions and ElectrochemistrySingle correct
Which of the following electrolytes can be used to obtain H₂S₂O₈ by the process of electrolysis?
  1. (A)Dilute solution of sodium sulphate
  2. (B)Dilute solution of sulphuric acid
  3. (C)Concentrated solution of sulphuric acid
  4. (D)Acidified dilute solution of sodium sulphate

Correct answer: (C)

Step-by-step solution →
Q38·Chemistry·Aldehydes and KetonesSingle correct
Among the compounds (A)–(E) shown, choose the set that gives a positive Fehling’s test.
  1. (A)(A), (C) and (D) only
  2. (B)(A), (D) and (E) only
  3. (C)(C), (D) and (E) only
  4. (D)(A), (B) and (C) only

Correct answer: (C)

Step-by-step solution →
Q39·Chemistry·Coordination CompoundsSingle correct
In which of the following complexes will the crystal-field stabilisation energy (CFSE, Δ₀) be equal to zero?
  1. (A)[Fe(NH₃)₆]Br₃
  2. (B)[Fe(en)₃]Cl₃
  3. (C)K₂[Fe(CN)₄]
  4. (D)K₃[Fe(SCN)₆]

Correct answer: (D)

Step-by-step solution →
Q40·Chemistry·SolutionsSingle correct
Arrange the following solutions in order of their increasing boiling points: (i) 10⁻⁴ M NaCl, (ii) 10⁻⁴ M Urea, (iii) 10⁻³ M NaCl, (iv) 10⁻² M NaCl.
  1. (A)(ii) < (i) < (iii) < (iv)
  2. (B)(i) < (ii) < (iii) < (iv)
  3. (C)(iv) < (iii) < (i) < (ii)
  4. (D)(iv) < (iii) < (ii) < (i)

Correct answer: (A)

Step-by-step solution →
Q41·Chemistry·Diazonium Salts and ReactionsSingle correct
Nitrobenzene is subjected to the reaction sequence (i) Br₂, AcOH; (ii) Sn, HCl; (iii) NaNO₂, HCl, 273 K; (iv) C₂H₅OH, giving products A and B. Identify A and B. (See figure for the option structures.)
  1. (A)3-bromophenol and 3-bromophenetole
  2. (B)3-bromophenetole and CH₃COOH
  3. (C)bromobenzene and CH₃CHO
  4. (D)3-bromophenol and CH₃CHO

Correct answer: (C)

Step-by-step solution →
Q42·Chemistry·Coordination CompoundsSingle correct
From the magnetic behaviour of [NiCl₄]²⁻ (paramagnetic) and [Ni(CO)₄] (diamagnetic), choose the correct geometry and oxidation state:
  1. (A)[NiCl₄]²⁻: Ni⁰, square planar; [Ni(CO)₄]: Ni(0), square planar
  2. (B)[NiCl₄]²⁻: Ni⁰, tetrahedral; [Ni(CO)₄]: Ni(0), tetrahedral
  3. (C)[NiCl₄]²⁻: Ni²⁺, tetrahedral; [Ni(CO)₄]: Ni⁰, square planar
  4. (D)[NiCl₄]²⁻: Ni²⁺, tetrahedral; [Ni(CO)₄]: Ni(0), tetrahedral

Correct answer: (D)

Step-by-step solution →
Q43·Chemistry·HydrocarbonsSingle correct
Identify the INCORRECT statements regarding geometrical isomerism: (A) Propene shows geometrical isomerism. (B) The trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) cis-but-2-ene has a higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) The trans isomer has a lower melting point than the cis isomer. Choose the correct answer:
  1. (A)(A), (D) and (E) only
  2. (B)(C), (D) and (E) only
  3. (C)(B) and (E) only
  4. (D)(A) and (D) only

Correct answer: (A)

Step-by-step solution →
Q44·Chemistry·Some Basic Concepts in ChemistryInteger
Some CO₂ gas was kept in a sealed container at a pressure of 1 atm and 273 K. This entire amount of CO₂ was later passed through an aqueous solution of Ca(OH)₂. The excess unreacted Ca(OH)₂ was neutralised with 40 mL of 0.1 M HCl. The CO₂ reacted with exactly half the initial amount of Ca(OH)₂ present. If the volume of the sealed container of CO₂ was x, then x is ______ cm³ (nearest integer).

Correct answer: 45

Step-by-step solution →
Q45·Chemistry·Purification and Characterisation of Organic CompoundsInteger
In the Carius method for the estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ______ %. (molar masses: AgCl = 143.5, Ag = 108, Cl = 35.5)

Correct answer: 20

Step-by-step solution →
Q46·Chemistry·Chemical Bonding and Molecular StructureInteger
The number of molecules/ions that show linear geometry among the following is ______: SO₂, BeCl₂, CO₂, N₃⁻, NO₂, F₂O, XeF₂, NO₂⁺, I₃⁻, O₃.

Correct answer: 6

Step-by-step solution →
Q47·Chemistry·Chemical KineticsInteger
A molecule A changes into its isomeric form B by first-order kinetics at 1000 K. If the energy barrier with respect to the reactant is 191.48 kJ mol⁻¹ and the frequency factor is 10²⁰, the time required for 50% of A to convert to B is ______ picoseconds (nearest integer). (R = 8.314 J K⁻¹ mol⁻¹)

Correct answer: 69

Step-by-step solution →
Q48·Chemistry·Diazonium Salts and ReactionsInteger
Consider the following sequence of reactions on nitrobenzene: (i) Sn + HCl; (ii) NaNO₂, HCl, 0 °C; (iii) Cu₂Cl₂; (iv) Na, ether. The molar mass of the product A formed is ______ g mol⁻¹.

Correct answer: 154

Step-by-step solution →

Mathematics — JEE Main 22 January 2025 Shift 1

Q49·Mathematics·Sets, Relations and FunctionsSingle correct
The number of non-empty equivalence relations on the set {1,2,3}\{1,2,3\}{1,2,3} is:
  1. (A)6
  2. (B)7
  3. (C)5
  4. (D)4

Correct answer: (C)

Step-by-step solution →
Q50·Mathematics·Area Under CurvesSingle correct
Let f:R→Rf:\mathbb{R}\to\mathbb{R}f:R→R be twice differentiable with f(x+y)=f(x)f(y)f(x+y)=f(x)f(y)f(x+y)=f(x)f(y) for all x,yx,yx,y. If f′(0)=4af'(0)=4af′(0)=4a and f′′(x)−3a f′(x)−f(x)=0 (a>0)f''(x)-3a\,f'(x)-f(x)=0\,(a>0)f′′(x)−3af′(x)−f(x)=0(a>0), then the area of R={(x,y):0≤y≤f(ax), 0≤x≤2}R=\{(x,y):0\le y\le f(ax),\,0\le x\le 2\}R={(x,y):0≤y≤f(ax),0≤x≤2} is:
  1. (A)e4−1e^{4}-1e4−1
  2. (B)e2+1e^{2}+1e2+1
  3. (C)e4+1e^{4}+1e4+1
  4. (D)e2−1e^{2}-1e2−1

Correct answer: (D)

Step-by-step solution →
Q51·Mathematics·Straight LinesSingle correct
Let triangle PQR be the image of the triangle with vertices (1,3),(3,1),(2,4)(1,3),(3,1),(2,4)(1,3),(3,1),(2,4) in the line x+2y=2x+2y=2x+2y=2. If the centroid of △PQR\triangle PQR△PQR is (α,β)(\alpha,\beta)(α,β), then 15(α−β)15(\alpha-\beta)15(α−β) equals:
  1. (A)24
  2. (B)19
  3. (C)21
  4. (D)22

Correct answer: (D)

Step-by-step solution →
Q52·Mathematics·Complex NumbersSingle correct
Let z1,z2,z3z_1,z_2,z_3z1​,z2​,z3​ lie on ∣z∣=1|z|=1∣z∣=1 with arg⁡z1=−π4, arg⁡z2=0, arg⁡z3=π4\arg z_1=-\tfrac{\pi}{4},\ \arg z_2=0,\ \arg z_3=\tfrac{\pi}{4}argz1​=−4π​, argz2​=0, argz3​=4π​. If ∣z1zˉ2+z2zˉ3+z3zˉ1∣2=α+β2 (α,β∈Z)|z_1\bar z_2+z_2\bar z_3+z_3\bar z_1|^2=\alpha+\beta\sqrt2\ (\alpha,\beta\in\mathbb{Z})∣z1​zˉ2​+z2​zˉ3​+z3​zˉ1​∣2=α+β2​ (α,β∈Z), then α2+β2\alpha^2+\beta^2α2+β2 is:
  1. (A)24
  2. (B)41
  3. (C)33
  4. (D)29

Correct answer: (D)

Step-by-step solution →
Q53·Mathematics·Inverse Trigonometric FunctionsSingle correct
Using principal values, the sum of the maximum and minimum values of 16[(sec⁡−1x)2+(cosec⁡−1x)2]16\big[(\sec^{-1}x)^2+(\operatorname{cosec}^{-1}x)^2\big]16[(sec−1x)2+(cosec−1x)2] is:
  1. (A)24π224\pi^224π2
  2. (B)18π218\pi^218π2
  3. (C)31π231\pi^231π2
  4. (D)22π222\pi^222π2

Correct answer: (D)

Step-by-step solution →
Q54·Mathematics·Statistics and ProbabilitySingle correct
A coin is tossed three times. Let XXX be the number of times a tail follows a head. If μ,σ2\mu,\sigma^2μ,σ2 are the mean and variance of XXX, then 64(μ+σ2)64(\mu+\sigma^2)64(μ+σ2) equals:
  1. (A)51
  2. (B)48
  3. (C)32
  4. (D)64

Correct answer: (B)

Step-by-step solution →
Q55·Mathematics·Sequence and SeriesSingle correct
Let a1,a2,…a_1,a_2,\dotsa1​,a2​,… be a G.P. of increasing positive terms. If a1a5=28a_1a_5=28a1​a5​=28 and a2+a4=29a_2+a_4=29a2​+a4​=29, then a6a_6a6​ equals:
  1. (A)628
  2. (B)526
  3. (C)784
  4. (D)812

Correct answer: (C)

Step-by-step solution →
Q56·Mathematics·Three Dimensional GeometrySingle correct
Let L1:x−12=y−23=z−34L_1:\dfrac{x-1}{2}=\dfrac{y-2}{3}=\dfrac{z-3}{4}L1​:2x−1​=3y−2​=4z−3​ and L2:x−23=y−44=z−55L_2:\dfrac{x-2}{3}=\dfrac{y-4}{4}=\dfrac{z-5}{5}L2​:3x−2​=4y−4​=5z−5​. Which point lies on the line of shortest distance between L1L_1L1​ and L2L_2L2​?
  1. (A)(−53,−7,1)\left(-\tfrac53,-7,1\right)(−35​,−7,1)
  2. (B)(2,3,13)\left(2,3,\tfrac13\right)(2,3,31​)
  3. (C)(83,−1,13)\left(\tfrac83,-1,\tfrac13\right)(38​,−1,31​)
  4. (D)(143,−3,223)\left(\tfrac{14}{3},-3,\tfrac{22}{3}\right)(314​,−3,322​)

Correct answer: (D)

Step-by-step solution →
Q57·Mathematics·Quadratic EquationsSingle correct
The product of all solutions of e5(log⁡ex)2+3=x8 (x>0)e^{5(\log_e x)^2+3}=x^{8}\,(x>0)e5(loge​x)2+3=x8(x>0) is:
  1. (A)e8/5e^{8/5}e8/5
  2. (B)e6/5e^{6/5}e6/5
  3. (C)e
  4. (D)e2e^{2}e2

Correct answer: (A)

Step-by-step solution →
Q58·Mathematics·Sequence and SeriesSingle correct
If ∑r=1nTr=(2n−1)(2n+1)(2n+3)(2n+5)64\displaystyle\sum_{r=1}^{n}T_r=\dfrac{(2n-1)(2n+1)(2n+3)(2n+5)}{64}r=1∑n​Tr​=64(2n−1)(2n+1)(2n+3)(2n+5)​, then lim⁡n→∞∑r=1n1Tr\displaystyle\lim_{n\to\infty}\sum_{r=1}^{n}\dfrac1{T_r}n→∞lim​r=1∑n​Tr​1​ equals:
  1. (A)1
  2. (B)0
  3. (C)23\tfrac2332​
  4. (D)13\tfrac1331​

Correct answer: (C)

Step-by-step solution →
Q59·Mathematics·Permutations and CombinationsSingle correct
From the English alphabet, five letters are chosen and arranged in alphabetical order. The number of ways in which the middle letter is "M" is:
  1. (A)14950
  2. (B)6084
  3. (C)4356
  4. (D)5148

Correct answer: (D)

Step-by-step solution →
Q60·Mathematics·Differential EquationsSingle correct
Let x=x(y)x=x(y)x=x(y) be the solution of dxdy+xy2=1y3\dfrac{dx}{dy}+\dfrac{x}{y^{2}}=\dfrac{1}{y^{3}}dydx​+y2x​=y31​ with x(1)=1x(1)=1x(1)=1. Then x(12)x\big(\tfrac12\big)x(21​) is:
  1. (A)12+e\tfrac12+e21​+e
  2. (B)32+e\tfrac32+e23​+e
  3. (C)3-e
  4. (D)3+e

Correct answer: (C)

Step-by-step solution →
Q61·Mathematics·CirclesSingle correct
Let the parabola y=x2+px−3y=x^2+px-3y=x2+px−3 meet the axes at P, Q, R. If the circle with centre (−1,−1)(-1,-1)(−1,−1) passes through P, Q, R, then the area of △PQR\triangle PQR△PQR is:
  1. (A)4
  2. (B)6
  3. (C)7
  4. (D)5

Correct answer: (B)

Step-by-step solution →
Q62·Mathematics·CirclesSingle correct
A circle C of radius 2 lies in the second quadrant and touches both axes. Another circle has centre (2,5)(2,5)(2,5) and radius rrr and intersects C at exactly two points. If the set of possible rrr is (α,β)(\alpha,\beta)(α,β), then 3β−2α3\beta-2\alpha3β−2α equals:
  1. (A)15
  2. (B)24
  3. (C)12
  4. (D)10

Correct answer: (A)

Step-by-step solution →
Q63·Mathematics·Definite IntegrationSingle correct
Let f(x)=7tan⁡8x+7tan⁡6x−3tan⁡4x−3tan⁡2xf(x)=7\tan^8x+7\tan^6x-3\tan^4x-3\tan^2xf(x)=7tan8x+7tan6x−3tan4x−3tan2x, I1=∫0π/4f(x) dxI_1=\int_0^{\pi/4}f(x)\,dxI1​=∫0π/4​f(x)dx, I2=∫0π/4x f(x) dxI_2=\int_0^{\pi/4}x\,f(x)\,dxI2​=∫0π/4​xf(x)dx. Then 7I1+12I27I_1+12I_27I1​+12I2​ is:
  1. (A)2π2\pi2π
  2. (B)π\piπ
  3. (C)1
  4. (D)2

Correct answer: (C)

Step-by-step solution →
Q64·Mathematics·DifferentiabilitySingle correct
Let fff be differentiable with f(0)=1f(0)=1f(0)=1 and f(x+y)=f(x)f(y)f(x+y)=f(x)f(y)f(x+y)=f(x)f(y). Under the given conditions, ∑n=1100f′(n)\displaystyle\sum_{n=1}^{100}f'(n)n=1∑100​f′(n) equals:
  1. (A)2384
  2. (B)2525
  3. (C)5220
  4. (D)2406

Correct answer: (B)

Step-by-step solution →
Q65·Mathematics·Sets, Relations and FunctionsSingle correct
Let A={1,2,…,10}A=\{1,2,\dots,10\}A={1,2,…,10} and B={mn:m,n∈A, m<n, gcd⁡(m,n)=1}B=\{\tfrac{m}{n}:m,n\in A,\ m<n,\ \gcd(m,n)=1\}B={nm​:m,n∈A, m<n, gcd(m,n)=1}. Then n(B)n(B)n(B) equals:
  1. (A)31
  2. (B)36
  3. (C)37
  4. (D)29

Correct answer: (A)

Step-by-step solution →
Q66·Mathematics·Area Under CurvesSingle correct
The area of the region inside the circle (x−23)2+y2=12(x-2\sqrt3)^2+y^2=12(x−23​)2+y2=12 and outside the parabola y2=23 xy^2=2\sqrt3\,xy2=23​x is:
  1. (A)6π−86\pi-86π−8
  2. (B)3π−83\pi-83π−8
  3. (C)6π−166\pi-166π−16
  4. (D)5π+85\pi+85π+8

Correct answer: (C)

Step-by-step solution →
Q67·Mathematics·Statistics and ProbabilitySingle correct
Two balls are drawn one by one without replacement from a bag of 4 white and 6 black balls. If the probability that the first ball is black given that the second ball is black is mn\tfrac{m}{n}nm​ (gcd⁡(m,n)=1\gcd(m,n)=1gcd(m,n)=1), then m+nm+nm+n equals:
  1. (A)14
  2. (B)4
  3. (C)11
  4. (D)13

Correct answer: (A)

Step-by-step solution →
Q68·Mathematics·HyperbolaSingle correct
The foci of a hyperbola are (1,14)(1,14)(1,14) and (1,−12)(1,-12)(1,−12), and it passes through (1,6)(1,6)(1,6). The length of its latus rectum is:
  1. (A)256\tfrac{25}{6}625​
  2. (B)245\tfrac{24}{5}524​
  3. (C)2885\tfrac{288}{5}5288​
  4. (D)1445\tfrac{144}{5}5144​

Correct answer: (C)

Step-by-step solution →
Q69·Mathematics·DifferentiabilityInteger
Let f(x)={−3ax2−2,x<1a2+bx,x≥1f(x)=\begin{cases}-3ax^2-2,&x<1\\ a^2+bx,&x\ge1\end{cases}f(x)={−3ax2−2,a2+bx,​x<1x≥1​ be differentiable for all x∈Rx\in\mathbb{R}x∈R (a>1a>1a>1). With the region enclosed by y=f(x)y=f(x)y=f(x) and the given line equal to β3\beta\sqrt3β3​ (α,β∈Z\alpha,\beta\in\mathbb{Z}α,β∈Z), find α+β\alpha+\betaα+β.

Correct answer: 34

Step-by-step solution →
Q70·Mathematics·Sequence and SeriesInteger
A finite sum of the form ∑(r+2)/(2r+1)\sum (r+2)/(2^{r+1})∑(r+2)/(2r+1)-type series evaluates to mn\tfrac{m}{n}nm​ with gcd⁡(m,n)=1\gcd(m,n)=1gcd(m,n)=1. Find m−nm-nm−n.

Correct answer: 2035

Step-by-step solution →
Q71·Mathematics·Matrices and DeterminantsInteger
Let AAA be a 3×33\times33×3 matrix with det⁡A=−2\det A=-2detA=−2. If det⁡(3 adj(−6 adj(3A)))=2m⋅3n\det\big(3\,\mathrm{adj}(-6\,\mathrm{adj}(3A))\big)=2^{m}\cdot 3^{n}det(3adj(−6adj(3A)))=2m⋅3n with m>nm>nm>n, find 4m+2n4m+2n4m+2n (per the paper).

Correct answer: 34

Step-by-step solution →
Q72·Mathematics·Three Dimensional GeometryInteger
Let L1:x−13=y−1−1=z+10L_1:\dfrac{x-1}{3}=\dfrac{y-1}{-1}=\dfrac{z+1}{0}L1​:3x−1​=−1y−1​=0z+1​ and L2:x−22=y+40=z+4αL_2:\dfrac{x-2}{2}=\dfrac{y+4}{0}=\dfrac{z+4}{\alpha}L2​:2x−2​=0y+4​=αz+4​ meet at B. If P is the foot of perpendicular from A(1,−1,1)A(1,-1,1)A(1,−1,1) on L2L_2L2​, find 26 α (PB)26\,\alpha\,(PB)26α(PB) (as integer).

Correct answer: 216

Step-by-step solution →
Q73·Mathematics·Vector AlgebraInteger
Let c^\hat cc^ be the projection vector of b⃗=λi^+4k^ (λ>0)\vec b=\lambda\hat i+4\hat k\ (\lambda>0)b=λi^+4k^ (λ>0) on a⃗=i^+2j^+2k^\vec a=\hat i+2\hat j+2\hat ka=i^+2j^​+2k^. If ∣a⃗+c^∣=7|\vec a+\hat c|=7∣a+c^∣=7, find the area of the parallelogram formed by b⃗\vec bb and c^\hat cc^.

Correct answer: 16

Step-by-step solution →

Chapters tested in this paper

Open any chapter to practise every past-year question on that topic across all papers, and see how often it has actually appeared.

  • Properties of Solids and Liquids 172/186
  • Three Dimensional Geometry 176/186
  • Matrices and Determinants 180/186
  • Coordination Compounds 176/186
  • Sets, Relations and Functions 165/186
  • Current Electricity 160/186
  • Sequence and Series 164/186
  • Definite Integration 168/186
  • Rotational Motion 172/186
  • Redox Reactions and Electrochemistry 177/186
  • Geometrical Optics 172/186
  • Kinematics 156/186
  • Vector Algebra 173/186
  • Differential Equations 167/186
  • Probability 176/186
  • Permutations and Combinations 162/186
  • Chemical Bonding and Molecular Structure 151/186
  • d- and f-Block Elements 126/186
  • Thermodynamics 154/186
  • Aldehydes and Ketones 135/186
  • Equilibrium 163/186
  • Solutions 158/186
  • Chemical Thermodynamics 165/186
  • Units and Measurements 149/186
  • Hydrocarbons 126/186
  • Complex Numbers 165/186
  • Biomolecules 162/186
  • Chemical Kinetics 169/186
  • Gravitation 152/186
  • Electric Field and Coulomb's Law 133/186
  • Atomic Structure 161/186
  • Electronic Devices 145/186
  • Circles 142/186
  • Dual Nature of Matter and Radiation 155/186
  • Quadratic Equations 148/186
  • Work, Energy and Power 132/186
  • Some Basic Concepts in Chemistry 129/186
  • Wave Optics 130/186
  • Area Under Curves 139/186
  • Purification and Characterisation of Organic Compounds 116/186
  • Organic Compounds Containing Halogens 109/186
  • Straight Lines 114/186
  • Waves 109/186
  • Capacitors and Dielectrics 115/186
  • Atoms 112/186
  • Classification of Elements and Periodicity in Properties 113/186
  • Differentiability 91/186
  • Inverse Trigonometric Functions 93/186
  • Hyperbola 77/186
  • Experimental Skills 68/186
  • Diazonium Salts and Reactions 53/186
  • Isomerism 51/186
  • IUPAC Nomenclature 37/186
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