JEE Main 2025 (22 Jan Shift 1) Previous Year Paper with Answer Keys

Let $a_1,a_2,a_3,\dots$ be a G.P. of increasing positive terms. If $a_1{a}_5=28$ and $a_2+a_4=29$, then $a_6$ is equal to:

Let $x=x(y)$ be the solution of the differential equation $y^{2}dx+\left(x-\frac{1}{y}\right)dy=0$. If $x(1)=1$, then $x\left(\frac{1}{2}\right)$ is:

Two balls are selected at random one by one without replacement from a bag containing 4 white and 6 black balls. If the probability that the first selected ball is black, given that the second selected ball is also black, is $\frac{m}{n}$, where $\gcd (m,n)=1$, then $m+n$ is equal to:

The product of all solutions of the equation $e^{5({\log }_{e}x{)}^2+3}=x^8$, $x>0$, is:

Let the triangle $PQR$ be the image of the triangle with vertices $(1,3)$, $(3,1)$ and $(2,4)$ in the line $x+2y=2$. If the centroid of $△PQR$ is the point $(\alpha ,\beta )$, then $15(\alpha -\beta )$ is equal to:

Let $f(x)=7{\tan }^{8}x+7{\tan }^{6}x-3{\tan }^{4}x-3{\tan }^{2}x$, $I_1={\int }_0^{\pi /4}f(x)dx$ and $I_2={\int }_0^{\pi /4}xf(x)dx$. Then $7I_1+12I_2$ is equal to:

Let the parabola $y=x^2+px-3$ meet the coordinate axes at the points $P$, $Q$ and $R$. If the circle $C$ with centre at $(-1,-1)$ passes through the points $P$, $Q$ and $R$, then the area of $△PQR$ is:

Let $L_1:\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}$ and $L_2:\frac{x-2}{3}=\frac{y-4}{4}=\frac{z-5}{5}$ be two lines. Then which of the following points lies on the line of the shortest distance between $L_1$ and $L_2$?

Let $f(x)$ be a real differentiable function such that $f(0)=1$ and $f(x+y)=f(x)f^{\prime }(y)+f^{\prime }(x)f(y)$ for all $x,y\in \mathbb{R}$. Then ${\sum }_{n=1}^{100}{\log }_{e}f(n)$ is equal to:

From all the English alphabets, five letters are chosen and are arranged in alphabetical order. The total number of ways, in which the middle letter is 'M', is:

Using the principal values of the inverse trigonometric functions, the sum of the maximum and the minimum values of $16\left[({\sec }^{-1}x{)}^2+({\mathrm{cosec}}^{-1}x{)}^2\right]$ is:

Let $f:\mathbb{R}\to \mathbb{R}$ be a twice differentiable function such that $f(x+y)=f(x)f(y)$ for all $x,y\in \mathbb{R}$. If $f^{\prime }(0)=4a$ and $f$ satisfies $f^{\prime \prime }(x)-3a{f}^{\prime }(x)-f(x)=0$, $a>0$, then the area of the region $\mathcal{R}=\{(x,y)\mid 0\le y\le f(ax),0\le x\le 2\}$ is:

The area of the region, inside the circle $(x-2\sqrt{3}{)}^2+y^2=12$ and outside the parabola $y^2=2\sqrt{3}x$ is:

Let the foci of a hyperbola be $(1,14)$ and $(1,-12)$. If it passes through the point $(1,6)$, then the length of its latus-rectum is:

If ${\sum }_{r=1}^n{T}_r=\frac{(2n-1)(2n+1)(2n+3)(2n+5)}{64}$, then ${\lim }_{n\to \infty }{\sum }_{r=1}^n\left(\frac{1}{T_r}\right)$ is equal to:

A coin is tossed three times. Let $X$ denote the number of times a tail follows a head. If $\mu$ and ${\sigma }^2$ denote the mean and variance of $X$, then the value of $64(\mu +{\sigma }^2)$ is:

The number of non-empty equivalence relations on the set $\{1,2,3\}$ is:

A circle of radius 2 lies in the second quadrant and touches both the coordinate axes. Let $r$ be the radius of a circle that has centre at the point $(2,5)$ and intersects the circle at exactly two points. If the set of all possible values of $r$ is the interval $(\alpha ,\beta )$, then $3\beta -2\alpha$ is equal to:

Let $A=\{1,2,3,\dots ,10\}$ and $B=\left\{\frac{m}{n}:m,n\in A,m<n\text{ and }\gcd (m,n)=1\right\}$. Then $n(B)$ is equal to:

Let $z_1$, $z_2$ and $z_3$ be three complex numbers on the circle $|z|=1$ with $\arg (z_1)=-\frac{\pi }{4}$, $\arg (z_2)=0$ and $\arg (z_3)=\frac{\pi }{4}$. If $|z_1\overline{z_2}+z_2\overline{z_3}+z_3\overline{z_1}{|}^2=\alpha +\beta \sqrt{2}$, $\alpha ,\beta \in \mathbb{Z}$, then the value of ${\alpha }^2+{\beta }^2$ is:

Let $A$ be a square matrix of order 3 such that $\det (A)=-2$ and $\det (3\text{adj}(-6\text{adj}(3A)))=2^{m+n}\cdot 3^{mn}$, $m>n$. Then $4m+2n$ is equal to _______

If ${\sum }_{r=0}^5\frac{{}^{11}{C}_{2r}}{2^{r+2}}=\frac{m}{n}$, $\gcd (m,n)=1$, then $m-n$ is equal to _______

Let $\vec{c}$ be the projection vector of $\vec{b}=\lambda \hat{i}+4\hat{k}$, $\lambda >0$, on the vector $\vec{a}=\hat{i}+2\hat{j}+2\hat{k}$. If $|\vec{a}+\vec{c}|=7$, then the area of the parallelogram formed by the vectors $\vec{b}$ and $\vec{c}$ is ________

Let the function $f(x) =

$bedifferentiableforall$x \in \mathbb{R}$,where$a > 1$,$b \in \mathbb{R}$.Iftheareaoftheregionenclosedby$y = f(x)$andtheline$y = -20$is$\alpha + \beta\sqrt{3}$,$\alpha, \beta \in \mathbb{Z}$,thenthevalueof$\alpha + \beta$ is ________

Let $L_1:\frac{x-1}{3}=\frac{y-1}{-1}=\frac{z+1}{0}$ and $L_2:\frac{x-2}{2}=\frac{y}{0}=\frac{z+4}{\alpha }$, $\alpha \in \mathbb{R}$, be two lines, which intersect at the point $B$. If $P$ is the foot of perpendicular from the point $A(1,1,-1)$ on $L_2$, then the value of $26\alpha (PB{)}^2$ is _________

An electron is made to enter symmetrically between two parallel and equally but oppositely charged metal plates, each of 10 cm length. The electron emerges out of the electric field region with a horizontal component of velocity $10^6$ m/s. If the magnitude of the electric field between the plates is 9.1 V/cm, then the vertical component of velocity of electron is (mass of electron $=9.1\times 10^{-31}$ kg and charge of electron $=1.6\times 10^{-19}$ C)

Given below are two statements:

Statement-I: The equivalent emf of two nonideal batteries connected in parallel is smaller than either of the two emfs.

Statement-II: The equivalent internal resistance of two nonideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries.

In the light of the above statements, choose the correct answer from the options given below.

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. Find the moment of inertia of the remaining part of the original disc about the axis as given above.

An amount of ice of mass $10^{-3}$ kg and temperature $-10°C$ is transformed to vapour of temperature $110°C$ by applying heat. The total amount of work required for this conversion is, (Take, specific heat of ice $=2100{\text{J kg}}^{-1}{\text{K}}^{-1}$, specific heat of water $=4180{\text{J kg}}^{-1}{\text{K}}^{-1}$, specific heat of steam $=1920{\text{J kg}}^{-1}{\text{K}}^{-1}$, Latent heat of ice $=3.35\times 10^5{\text{J kg}}^{-1}$ and Latent heat of steam $=2.25\times 10^6{\text{J kg}}^{-1}$)

An electron in the ground state of the hydrogen atom has the orbital radius of $5.3\times 10^{-11}$ m while that for the electron in third excited state is $8.48\times 10^{-10}$ m. The ratio of the de Broglie wavelengths of electron in the excited state to that in the ground state is

A bob of mass $m$ is suspended at a point $O$ by a light string of length $l$ and left to perform vertical motion (circular) as shown in figure. Initially, by applying horizontal velocity $v_0$ at the point 'A', the string becomes slack when, the bob reaches at the point 'D'. The ratio of the kinetic energy of the bob at the points $B$ and $C$ is ______

Given is a thin convex lens of glass (refractive index $\mu$) and each side having radius of curvature $R$. One side is polished for complete reflection. At what distance from the lens, an object be placed on the optic axis so that the image gets formed on the object itself?

Which of the following circuits represents a forward biased diode?

Sliding contact of a potentiometer is in the middle of the potentiometer wire having resistance $R_p=1\Omega$ as shown in the figure. An external resistance of $R_e=2\Omega$ is connected via the sliding contact. The electric current in the circuit is:

A small point of 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 $F_1$. A spherical part of radius $R/3$ is removed from the big sphere as shown in the figure and the gravitational force on m due to remaining part of M is found to be $F_2$. The value of ratio $F_1:F_2$ is

A closed organ and an open organ tube are filled by two different gases having same bulk modulus but different densities ${\rho }_1$ and ${\rho }_2$, respectively. The frequency of 9th harmonic of closed tube is identical with 4th harmonic of open tube. If the length of the closed tube is 10 cm and the density ratio of the gases is ${\rho }_1:{\rho }_2=1:16$, then the length of the open tube is:

If $B$ is magnetic field and ${\mu }_0$ is permeability of free space, then the dimensions of $\frac{B}{{\mu }_0}$ is

A line charge of length $\frac{a}{2}$ is kept at the center of an edge $BC$ of a cube $ABCDEFGH$ having edge length 'a' as shown in the figure. If the density of line charge is $\lambda$ C per unit length, then the total electric flux through all the faces of the cube will be. (Take, ${ϵ}_0$ as the free space permittivity)

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 from the options given below.

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surfaces, then photo-electric effect is possible for the case of

Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K. If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible),

In the diagram given below, there are three lenses formed. Considering negligible thickness of each of them as compared to $|R_1|$ and $|R_2|$, i.e., the radii of curvature for upper and lower surfaces of the glass lens, the power of the combination is

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion-(A): If Young's double slit experiment is performed in an optically denser medium than air, then 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 from the options given below:

A parallel-plate capacitor of capacitance $40\mu \text{F}$ 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 dielectric material, the extra charge and the change in the electrostatic energy in the capacitor, respectively, are

Which of the following resistivity ($\rho$) vs. temperature (T) curves is most suitable to be used in wire bound standard resistors?

The driver sitting inside a parked car is watching vehicles approaching from behind with the help of his side view mirror, which is a convex mirror with radius of curvature $R=2$ m. Another car approaches him from behind with a uniform speed of 90 km/hr. When the car is at a distance of 24 m from him, the magnitude of the acceleration of the image of the car in the side view mirror is 'a'. The value of 100 a is _______ m/s².

Two soap bubbles of radius 2 cm and 4 cm, respectively, are in contact with each other. The radius of curvature of the common surface, in cm, is ______ .

The position vectors of two 1 kg particles, (A) and (B), are given by $\overrightarrow{r_A}=({\alpha }_1{t}^2\hat{i}+{\alpha }_{2}t\hat{j}+{\alpha }_{3}t\hat{k})$ m and $\overrightarrow{r_B}=({\beta }_{1}t\hat{i}+{\beta }_2{t}^2\hat{j}+{\beta }_{3}t\hat{k})$ m, respectively; $({\alpha }_1=1{\text{m/s}}^2$, ${\alpha }_2=3n\text{m/s}$, ${\alpha }_3=2\text{m/s}$, ${\beta }_1=2\text{m/s}$, ${\beta }_2=-1{\text{m/s}}^2$, ${\beta }_3=4p\text{m/s})$, where t is time, n and p are constants. At $t=1$ s, $|\overrightarrow{V_A}|=|\overrightarrow{V_B}|$ and velocities $\overrightarrow{V_A}$ and $\overrightarrow{V_B}$ of the particles are orthogonal to each other. At $t=1$ s, the magnitude of angular momentum of particle (A) with respect to the position of particle (B) is $\sqrt{L}{\text{kg m}}^2{\text{s}}^{-1}$. The value of L is _______ .

Three conductors of same length having thermal conductivity $k_1$, $k_2$ and $k_3$ are connected as shown in figure.

Area of cross sections of 1st and 2nd conductor are same and for 3rd conductor it is double of the 1st conductor. The temperatures are given in the figure. In steady state condition, the value of $\theta$ is _______ °C. (Given: $k_1=60{\text{J s}}^{-1}{\text{m}}^{-1}{\text{K}}^{-1}$, $k_2=120{\text{J s}}^{-1}{\text{m}}^{-1}{\text{K}}^{-1}$, $k_3=135{\text{J s}}^{-1}{\text{m}}^{-1}{\text{K}}^{-1}$)

A particle is projected at an angle of $30°$ from horizontal at a speed of 60 m/s. The height traversed by the particle in the first second is $h_0$ and height traversed in the last second, before it reaches the maximum height, is $h_1$. The ratio $h_0:h_1$ is _________ [Take, $g=10$ m/s²]

Radius of the first excited state of Helium ion is given as: $a_0\to$ radius of first stationary state of hydrogen atom.

The incorrect statements regarding geometrical isomerism are: (A) Propene shows geometrical isomerism. (B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) Trans-isomer has lower melting point than cis isomer. Choose the correct answer from the options given below:

A liquid when kept inside a thermally insulated closed vessel at $25°C$ was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters?

Which of the following electronegativity order is incorrect?

Lanthanoid ions with $4f^7$ configuration are: (A) ${\text{Eu}}^{2+}$ (B) ${\text{Gd}}^{3+}$ (C) ${\text{Eu}}^{3+}$ (D) ${\text{Tb}}^{3+}$ (E) ${\text{Sm}}^{2+}$ Choose the correct answer from the options given below:

Given below are two statements:

Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of ${\text{H}}_2$ gas.

Statement II: Four g of propyne reacts with ${\text{NaNH}}_2$ to liberate ${\text{NH}}_3$ gas which occupies 224 mL at STP.

In the light of the above statements, choose the most appropriate answer from the options given below:

Choose the correct answer from the options given below :

Which of the following electrolyte can be used to obtain ${\text{H}}_2{\text{S}}_2{\text{O}}_8$ by the process of electrolysis?

Given below are two statements: Statement I: ${\text{CH}}_3-\text{O}-{\text{CH}}_2-\text{Cl}$ will undergo ${\text{S}}_{\text{N}}1$ reaction though it is a

primary halide. Statement II: will not undergo ${\text{S}}_{\text{N}}2$ reaction very easily though it is a primary halide. In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following acids is a vitamin?

Match List-I with List-II.

List-I:

(A) ${\text{Al}}^{3+}<{\text{Mg}}^{2+}<{\text{Na}}^{+}<{\text{F}}^{-}$

(B) $\text{B}<\text{C}<\text{O}<\text{N}$

(C) $\text{B}<\text{Al}<\text{Mg}<\text{K}$

(D) $\text{Si}<\text{P}<\text{S}<\text{Cl}$

List-II:

(I) Ionisation Enthalpy

(II) Metallic character

(III) Electronegativity

(IV) Ionic radii

Which of the following statement is not true for radioactive decay?

Consider the following sequence of reactions:

How many different stereoisomers are possible for the given molecule?

${\text{CH}}_3-\text{CH}-\text{CH}=\text{CH}-{\text{CH}}_3$

$|$

$\text{OH}$

A vessel at $1000\text{K}$ contains ${\text{CO}}_2$ with a pressure of $0.5\text{atm}$. Some of ${\text{CO}}_2$ is converted into $\text{CO}$ on addition of graphite. If total pressure at equilibrium is $0.8\text{atm}$, then $K_p$ is:

A solution of aluminium chloride is electrolysed for 30 minutes using a current of $2\text{A}$. The amount of the aluminium deposited at the cathode is [Given: molar mass of aluminium and chlorine are $27\text{g}{\text{mol}}^{-1}$ and $35.5\text{g}{\text{mol}}^{-1}$ respectively. Faraday constant $=96500\text{C}{\text{mol}}^{-1}$]

The IUPAC name of the following compound is:

In which of the following complexes the CFSE, ${\Delta }_o$, will be equal to zero?

Arrange the following solutions in order of their increasing boiling points. (i) $10^{-4}\text{M}\text{NaCl}$ (ii) Urea $10^{-4}\text{M}$ (iii) $10^{-3}\text{M}\text{NaCl}$ (iv) $10^{-2}\text{M}\text{NaCl}$

From the magnetic behaviour of $[{\text{NiCl}}_4{]}^{2-}$ (paramagnetic) and $[{\text{Ni(CO)}}_4]$ (diamagnetic), choose the correct geometry and oxidation state.

The number of molecules/ions that show linear geometry among the following is ________

${\text{SO}}_2,{\text{BeCl}}_2,{\text{CO}}_2,{\text{N}}_3^{-},{\text{NO}}_2,{\text{F}}_2\text{O},{\text{XeF}}_2,{\text{NO}}_2^{+},{\text{I}}_3^{-},{\text{O}}_3$

The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of $1000\text{K}$. If the energy barrier with respect to reactant energy for such isomeric transformation is $191.48\text{kJ}{\text{mol}}^{-1}$ and the frequency factor is $10^{20}$, the time required for $50\%$ molecules of A to become B is _________ picoseconds (nearest integer).

[Given: $R=8.314\text{J}{\text{K}}^{-1}{\text{mol}}^{-1}$]

Consider the following sequence of reactions:

Molar mass of the product formed (A) is _______ $\text{g}{\text{mol}}^{-1}$.

Some ${\text{CO}}_2$ gas was kept in a sealed container at a pressure of $1\text{atm}$ and at $273\text{K}$. This entire amount of ${\text{CO}}_2$ gas was later passed through an aqueous solution of ${\text{Ca(OH)}}_2$. The excess unreacted ${\text{Ca(OH)}}_2$ was later neutralized with $0.1\text{M}$ of $40\text{mL}\text{HCl}$. If the volume of the sealed container of ${\text{CO}}_2$ was $x$, then $x$ is ________ ${\text{cm}}^3$ (nearest integer).

[Given: The entire amount of ${\text{CO}}_2(g)$ reacted with exactly half the initial amount of ${\text{Ca(OH)}}_2$ present in the aqueous solution.]

In Carius method for estimation of halogens, $180\text{mg}$ of an organic compound produced $143.5\text{mg}$ of $\text{AgCl}$. The percentage composition of chlorine in the compound is _______ $\%$.

[Given: molar mass in $\text{g}{\text{mol}}^{-1}$ of Ag: 108, Cl: 35.5]