JEE Main 2025 (23 Jan Shift 1) Previous Year Paper with Answer Keys

If the first term of an A.P. is 3 and the sum of its first four terms is equal to one-fifth of the sum of the next four terms, then the sum of the first 20 terms is equal to

One die has two faces marked 1, two faces marked 2, one face marked 3 and one face marked 4. Another die has one face marked 1, two faces marked 2, two faces marked 3 and one face marked 4. The probability of getting the sum of numbers to be 4 or 5, when both the dice are thrown together, is

Let the position vectors of the vertices $A$, $B$ and $C$ of a tetrahedron $ABCD$ be $\hat{i}+2\hat{j}+\hat{k}$, $\hat{i}+3\hat{j}-2\hat{k}$ and $2\hat{i}+\hat{j}-\hat{k}$ respectively. The altitude from the vertex $D$ to the opposite face $ABC$ meets the median line segment through $A$ of the triangle $ABC$ at the point $E$. If the length of $AD$ is $\frac{\sqrt{110}}{3}$ and the volume of the tetrahedron is $\frac{\sqrt{805}}{6\sqrt{2}}$, then the position vector of $E$ is

If $A$, $B$, and $(\text{adj}(A^{-1})+\text{adj}(B^{-1}))$ are non-singular matrices of same order, then the inverse of $A(\text{adj}(A^{-1})+\text{adj}(B^{-1}){)}^{-1}B$, is equal to

Marks obtains by all the students of class 12 are presented in a frequency distribution with classes of equal width. Let the median of this grouped data be 14 with median class interval 12-18 and median class frequency 12. If the number of students whose marks are less than 12 is 18, then the total number of students is

Let a curve $y=f(x)$ pass through the points $(0,5)$ and $({\log }_{e}2,k)$. If the curve satisfies the differential equation $2(3+y)e^{2x}dx-(7+e^{2x})dy=0$, then $k$ is equal to

If the function $f(x) =

$iscontinuousat$x = 0$,then$k_1^2 + k_2^2$ is equal to

If the line $3x-2y+12=0$ intersects the parabola $4y=3x^2$ at the points $A$ and $B$, then at the vertex of the parabola, the line segment $AB$ subtends an angle equal to

Let $P$ be the foot of the perpendicular from the point $Q(10,-3,-1)$ on the line $\frac{x-3}{7}=\frac{y-2}{-1}=\frac{z+1}{-2}$. Then the area of the right angled triangle $PQR$, where $R$ is the point $(3,-2,1)$, is

Let the arc $AC$ of a circle subtend a right angle at the centre $O$. If the point $B$ on the arc $AC$, divides the arc such that $\frac{\text{length of arc }AB}{\text{length of arc }BC}=\frac{1}{5}$, and $OC=\alpha OA+\beta OB$, then $\alpha +\sqrt{2}(\sqrt{3}-1)\beta$ is equal to

Let $f(x)={\log }_{e}x$ and $g(x)=\frac{x^4-2x^3+3x^2-2x+2}{2x^2-2x+1}$. Then the domain of $f\circ g$ is

If the system of equations $

$hasinfinitelymanysolutions,then$\lambda^2 + \lambda$ is equal to

The number of words, which can be formed using all the letters of the word "DAUGHTER", so that all the vowels never come together, is

Let $R=\{(1,2),(2,3),(3,3)\}$ be a relation defined on the set $\{1,2,3,4\}$. Then the minimum number of elements, needed to be added in $R$ so that $R$ becomes an equivalence relation, is:

Let the area of a $△PQR$ with vertices $P(5,4)$, $Q(-2,4)$ and $R(a,b)$ be 35 square units. If its orthocenter and centroid are $O\left(2,\frac{14}{5}\right)$ and $C(c,d)$ respectively, then $c+2d$ is equal to

The value of \int_{e^2}^{e^4} \frac{1}{x}\left(\frac{e^{(\log_e x)^2 + 1} - 1}}{e^{(\log_e x)^2 + 1} - 1 + e^{(6 - \log_e x)^2 + 1} - 1}\right)dx is

Let $\left|\frac{z-i}{2z+i}\right|=\frac{1}{3}$, $z\in \mathbb{C}$, be the equation of a circle with center at $C(0,0)$. If the area of the triangle, whose vertices are at the points $(0,0)$, $C$ and $(\alpha ,0)$ is 11 square units, then ${\alpha }^2$ equals:

The value of $(\sin 70°)(\cot 10°\cot 70°-1)$ is

Let $I(x)=\int \frac{dx}{(x-11{)}^{11/13}(x+15{)}^{15/13}}$. If $I(37)-I(24)=\frac{1}{4}\left(\frac{1}{b^{1/13}}-\frac{1}{c^{1/13}}\right)$, $b,c\in \mathbb{N}$ then $3(b+c)$ is equal to

If $\frac{\pi }{2}\le x\le \frac{3\pi }{4}$, then ${\cos }^{-1}\left(\frac{12}{13}\cos x+\frac{5}{13}\sin x\right)$ is equal to

Let the circle $C$ touch the line $x-y+1=0$, have the centre on the positive $x$-axis, and cut off a chord of length $\frac{4}{\sqrt{13}}$ along the line $-3x+2y=1$. Let $H$ be the hyperbola $\frac{x^2}{{\alpha }^2}-\frac{y^2}{{\beta }^2}=1$, whose one of the foci is the centre of $C$ and the length of the transverse axis is the diameter of $C$. Then $2{\alpha }^2+3{\beta }^2$ is equal to ______

If the equation $a(b-c)x^2+b(c-a)x+c(a-b)=0$ has equal roots, where $a+c=15$ and $b=\frac{36}{5}$, then $a^2+c^2$ is equal to

If the set of all values of $a$, for which the equation $5x^3-15x-a=0$ has three distinct real roots, is the interval $(\alpha ,\beta )$, then $\beta -2\alpha$ is equal to ______

The sum of all rational terms in the expansion of $(1+2^{1/2}+3^{1/2}{)}^6$ is equal to

If the area of the larger portion bounded between the curves $x^2+y^2=25$ and $y=|x-1|$ is $\frac{1}{4}(b\pi +c)$, $b,c\in \mathbb{N}$ then $b+c$ is equal to

A point particle of charge $Q$ is located at $P$ along the axis of an electric dipole 1 at a distance $r$ as shown in the figure. The point P is also on the equatorial plane of a second electric dipole 2 at a distance $r$. The dipoles are made of opposite charge $q$ separated by a distance $2a$. For the charge particle at P not to experience any net force,

which of the following correctly describes the situation?

A spherical surface of radius of curvature $R=1.5$ separates air from glass (refractive index $=1.5$). The centre of curvature is in the glass medium. A point object 'O' placed in air on the optic axis of the surface, so that its real image is formed at 'I' inside glass. The line OI intersects the spherical surface at P and $PO=PI$. The distance $PO$ equals to

The position of a particle moving on $x$-axis is given by $x(t)=A\sin t+B{\cos }^{2}t+C{t}^2+D$, where $t$ is time. The dimension of $\frac{ABC}{D}$ is

Given a thin convex lens (refractive index ${\mu }_2$), kept in a liquid (refractive index ${\mu }_1$, ${\mu }_1<{\mu }_2$) having radii of curvatures $|R_1|$ and $|R_2|$. Its second surface is silver polished. Where should an object be placed on the optic axis so that a real and inverted image is formed at the same place?

Refer to the circuit diagram given in the figure. Which of the following observations are correct? A. Total resistance of circuit is $6\Omega$ B. Current in Ammeter is 1 A C. Potential across $AB$ is 4 Volts. D. Potential across $CD$ is 4 Volts E. Total resistance of the circuit is $8\Omega$. Choose the correct answer from the options given below:

Given below are two statements: Statement I: The hot water flows faster than cold water Statement II: Soap water has higher surface tension as compared to fresh water. In the light above statements, choose the correct answer from the options given below

Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of radius 5 cm is cut from this disc in such a way that the edge of the hole touches the edge of the disc. The distance of centre of mass of residual or remaining disc from the origin will be

The electric flux is $\varphi =\alpha \sigma +\beta \lambda$ where $\lambda$ and $\sigma$ are linear and surface charge density, respectively. $\left(\frac{\alpha }{\beta }\right)$ represents

A sub-atomic particle of mass $10^{-30}$ kg is moving with a velocity $2.21\times 10^6$ m/s. Under the matter wave consideration, the particle will behave closely like (Given: $h=6.63\times 10^{-34}$ J.s)

Consider a moving coil galvanometer (MCG): A. The torsional constant in moving coil galvanometer has dimensions $[M{L}^2{T}^{-2}]$ B. Increasing the current sensitivity may not necessarily increase the voltage sensitivity. C. If we increase number of turns to its double $(2N)$, then the voltage sensitivity doubles. D. MCG can be converted into an ammeter by introducing a shunt resistance of large value in parallel with galvanometer. E. Current sensitivity of MCG depends inversely on number of turns of coil. Choose the correct answer from the options given below:

Match list table showing thermodynamic processes

The electric field of an electromagnetic wave in free space is $\vec{E}=57\cos [7.5\times 10^{6}t-5\times 10^{-3}(3x+4y)](4\hat{i}-3\hat{j})\text{N/C}$. The associated magnetic field in Tesla is

A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process is 625 J, then the mass of the bullet is ____ grams. (Latent heat of fusion of lead $=2.5\times 10^4\text{J}{\text{kg}}^{-1}$ and specific heat capacity of lead $=125\text{J}{\text{kg}}^{-1}{\text{K}}^{-1}$)

What is the lateral shift of a ray refracted through a parallel-sided glass slab of thickness '$h$' in terms of the angle of incidence '$i$' and angle of refraction '$r$', if the glass slab is placed in air medium?

A radioactive nucleus $n_2$ has 3 times the decay constant as compared to the decay constant of another radioactive nucleus $n_1$. If initial number of both nuclei are the same, what is the ratio of number of nuclei of $n_2$ to the number of nuclei of $n_1$, after one half-life of $n_1$?

A light hollow cube of side length 10 cm and mass 10 g, is floating in water. It is pushed down and released to execute simple harmonic oscillations. The time period of oscillations is $y\pi \times 10^{-2}$ s, where the value of $y$ is (Acceleration due to gravity, $g=10{\text{m/s}}^2$, density of water $=10^3{\text{kg/m}}^3$)

Regarding self-inductance: A. The self-inductance of the coil depends on its geometry. B. Self-inductance does not depend on the permeability of the medium. C. Self-induced e.m.f. opposes any change in the current in a circuit. D. Self-inductance is electromagnetic analogue of mass in mechanics. E. Work needs to be done against self-induced e.m.f. in establishing the current. Choose the correct answer from the options given below:

The motion of an airplane is represented by velocity-time graph as shown below. The distance covered by

airplane in the first 30.5 second is _______ km.

Identify the valid statements relevant to the given circuit at the instant when the key is closed.

A. There will be no current through resistor $R$. B. There will be maximum current in the connecting wires. C. Potential difference between the capacitor plates A and B is minimum. D. Charge on the capacitor plates is minimum. Choose the correct answer from the options given below: [Diagram: Circuit with resistor R, capacitor with plates A and B, and 5V source]

A solid sphere of mass '$m$' and radius '$r$' is allowed to roll without slipping from the highest point of an inclined plane of length '$L$' and makes an angle $30°$ with the horizontal. The speed of the particle at the bottom of the plane is $v_1$. If the angle of inclination is increased to $45°$ while keeping $L$ constant. Then the new speed of the sphere at the bottom of the plane is $v_2$. The ratio $\frac{v_1^2}{v_2^2}$ is

A positive ion $A$ and a negative ion $B$ has charges $6.67\times 10^{-10}\text{C}$ and $9.6\times 10^{-10}\text{C}$, and masses $19.2\times 10^{-27}$ kg and $9\times 10^{-27}$ kg respectively. At an instant, the ions are separated by a certain distance $r$. At that instant the ratio of the magnitudes of electrostatic force to gravitational force is $P\times 10^{45}$, where the value of $10P$ is (Take $\frac{1}{4\pi {\epsilon }_0}=9\times 10^9{\text{Nm}}^2{\text{C}}^{-1}$ and universal gravitational constant as $6.67\times 10^{-11}{\text{Nm}}^2{\text{kg}}^{-2}$) Assume that charge may not be an integral multiple of electrons.

[Diagram: Circuit with 12V source, 3H inductor, and variable resistor R] In the given circuit the sliding contact is pulled outwards such that electric current in the circuit changes at the rate of $8$ A/s. At an instant when R is $12\Omega$, the value of the current in the circuit will be ______ A.

Two particles are located at equal distance from origin. The position vectors of those are represented by $\vec{A}=2\hat{i}+3n\hat{j}+2\hat{k}$ and $\vec{B}=2\hat{i}-2\hat{j}+4p\hat{k}$, respectively. If both the vectors are at right angle to each other, the value of $n^{-1}$ is _____ .

An ideal gas initially at temperature $0°\text{C}$, is compressed suddenly to one fourth of its volume. If the ratio of specific heat at constant pressure to that at constant volume is $\frac{3}{2}$, the change in temperature due to the thermodynamic process is _____ K.

A force $\vec{f}=x^{2}y\hat{i}+y^2\hat{j}$ acts on a particle in a plane $x+y=10$. The work done by this force during a displacement from $(0,0)$ to $(4\text{m},2\text{m})$ is ________ Joule (round off to the nearest integer)

Given below are two statements: Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent Statement II: In the presence of base, fructose undergoes rearrangement to give glucose. In the light of the above statements, choose the correct answer from the options given below

The complex that shows Facial - Meridional isomerism is:

${\text{FeO}}_2^{-}\stackrel{+2.0\text{v}}{\to }{\text{Fe}}^{3+}\stackrel{0.8\text{v}}{\to }{\text{Fe}}^{2+}\stackrel{-0.5\text{v}}{\to }{\text{Fe}}^0$ In the above diagram, the standard electrode potentials are given in volts (over the arrow). The value of $E{°}_{{\text{FeO}}_2^{-}/{\text{Fe}}^{2+}}$ is

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

Match the LIST-I with LIST-II [Diagram: Table showing classification of molecules based on octet rule and examples] Choose the correct answer from the options given below:

What amount of bromine will be required to convert 2 g of phenol into 2,4,6-tribromophenol? (Given molar mass in $\text{g}{\text{mol}}^{-1}$ of C, H, O, Br are 12, 1, 16, 80 respectively)

[Diagram: Five organic compounds labeled A-E] Which among the following react with Hinsberg's reagent? Choose the correct answer from the options given below:

The correct set of ions (aqueous solution) with same colour from the following is:

Given below are two statements: Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with ${\text{FeSO}}_4$ and ${\text{Na}}_4[{\text{Fe(CN)}}_6]$ In the light of the above statements, choose the correct answer from the options given below.

Propane molecule on chlorination under photochemical condition gives two di-chloro products, "x" and "y". Amongst "x" and "y", "x" is an optically active molecule. How many tri-chloro products (consider only structural isomers) will be obtained from "x" when it is further treated with chlorine under the photochemical condition?

${\text{CrCl}}_3\cdot x{\text{NH}}_3$ can exist as a complex. 0.1 molal aqueous solution of this complex shows a depression in freezing point of $0.558{}^{\circ }\text{C}$. Assuming 100% ionisation of this complex and coordination number of Cr is 6, the complex will be (Given $K_f=1.86{\text{K kg mol}}^{-1}$)

Which of the following happens when ${\text{NH}}_4\text{OH}$ is added gradually to the solution containing 1 M ${\text{A}}^{2+}$ and 1M${\text{B}}^{3+}$ ions? Given: $K_{sp}[{\text{A(OH)}}_2]=9\times 10^{-10}$ and $K_{sp}[{\text{B(OH)}}_3]=27\times 10^{-18}$ at 298 K.

The major product of the following reaction is: ${\text{CH}}_3{\text{CH}}_2\text{CH}=\text{O}\underset{\text{alkali}}{\overset{\text{excess HCHO}}{\to }}\underset{\text{reflux}}{\to }?$

Ice at $-5{}^{\circ }\text{C}$ is heated to become vapor with temperature of $110{}^{\circ }\text{C}$ at atmospheric pressure. The entropy change associated with this process can be obtained from

The incorrect statement among the following is options.

2.8 $\times 10^{-3}$ mol of ${\text{CO}}_2$ is left after removing $10^{21}$ molecules from its 'x' mg sample. The mass of ${\text{CO}}_2$ taken initially is Given: $N_A=6.02\times 10^{23}{\text{mol}}^{-1}$

Match the LIST-I with LIST-II

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this? Given: Rydberg constant $R_H=10^5{\text{cm}}^{-1}$, $h=6.6\times 10^{-34}\text{J s}$, $c=3\times 10^8\text{m/s}$

The d-electronic configuration of an octahedral Co(II) complex having magnetic moment of 3.95 BM is:

The correct stability order of the following species/molecules is:

[Diagram: Three molecular structures labeled p (cyclopropane anion), q (cyclopentadienyl anion), and r (benzene)]

The standard enthalpy and standard entropy of decomposition of ${\text{N}}_2{\text{O}}_4$ to ${\text{NO}}_2$ are 55.0 kJ mol${}^{-1}$ and 175.0 J/K/mol respectively. The standard free energy change for this reaction at $25{}^{\circ }\text{C}$ in J mol${}^{-1}$ is ________

For the thermal decomposition of ${\text{N}}_2{\text{O}}_5(g)$ at constant volume, the following table can be formed, for the reaction

mentioned below.

$x=\dots \times 10^{-3}$ atm [nearest integer] Given: Rate constant for the reaction is $4.606\times 10^{-2}{\text{s}}^{-1}$.

During "S" estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is _______ %. (Given molar mass in ${\text{gmol}}^{-1}$ of Ba : 137, S : 32, O : 16)

If 1 mM solution of ethylamine produces $\text{pH}=9$, then the ionization constant of ethylamine is $10^{-x}$. The value of $x$ is ______ (nearest integer). [The degree of ionization of ethylamine can be neglected with respect to unity.]

Consider the following sequence of reactions to produce major product (A)

[Diagram: Reaction sequence starting with methylnitrobenzene, with steps:

i) ${\text{Br}}_2$, Fe

ii) Sn, HCl

iii) NaNO${}_2$, HCl, 273K

iv) H${}_3$PO${}_2$, H${}_2$O]

Molar mass of product (A) is _______ ${\text{gmol}}^{-1}$. (Given molar mass in ${\text{gmol}}^{-1}$ of C : 12, H : 1, O : 16, Br : 80, N : 14, P : 31)