JEE Advanced 2026 Paper 1

Consider a hydrogen atom with vk, rk, and Kk denoting the velocity, orbital radius and kinetic energy of the electron in the kth orbit, respectively. The electron undergoes a transition from the nth orbit, emitting radiation corresponding to the Lyman series. Considering h to be the Planck's constant and 0 the permittivity of the free space, the correct statement(s) is/are:

1. Magnitude of change in kinetic energy of electron can be expressed as h4 | nvnrn - v1r1 |.
2. Magnitude of change in de Broglie wavelength of the electron can be expressed as e24 0 | 1Kn - 1K1 |.
3. Frequency of the radiation emitted can be expressed as e28 0 h ( 1r1 - 1rn ).
4. Magnitude of change in total energy of the electron can be expressed as h2 | v1r1 - nvnrn |.

The electric field associated with an electromagnetic wave travelling in vacuum is given by E0 (3y + 4z + t) i, where is the angular frequency. All quantities are in SI units. The correct statement(s) about this wave is/are: [Given: speed of light in vacuum c = 3 108 ms-1.]

1. The wave is travelling in - 15 (3 j + 4 k ) direction.
2. The magnitude of the wave vector is 0.5 m-1.
3. The value of is 1.5 109 rad s-1.
4. The magnetic field associated with this wave is given by E0c (3y + 4z + t) (4 j - 3 k ).

In the List-I, four optical effects are mentioned. The physical phenomena of light which are essential to describe these optical effects are given in List-II. Choose the option which describes the correct match between the entries in List-I to those in List-II.

1. P→5, Q→4, R→1, S→3
2. P→4, Q→2, R→1, S→3
3. P→4, Q→1, R→2, S→3
4. P→5, Q→4, R→1, S→2

Consider a large disk of radius R and two smaller disks, each of radius r = R/50, lying on its circumference, as shown in the figure. The smaller disks are initially in contact with each other, with an angular separation between their centers. They are made to roll without slipping in opposite directions, with constant angular velocities and 2 while the large disk is held stationary. The time at which the smaller disks are again in contact is: [Use ( ) = and ignore gravity.] [figure]

1. = 51 (2 - 451 )/
2. = 51 (2 - 251 )/3
3. = 51 (2 - 451 )/3
4. = 51 (2 - 251 )/

Consider a circuit consisting of a capacitor of capacitance C and a coil with N turns per unit length, cross sectional area S and length d, where d2 S. There is another coil of length d/2, cross sectional area S/2 and 2N turns per unit length completely inside the larger coil, as shown in the figure. The ends of this smaller coil are connected with each other by an insulated conducting wire. The self-inductance of the larger coil is L. Neglecting edge effects and all the Ohmic resistances, the resonant frequency of the circuit is: [figure]

1. 4 15 LC
2. 6 5 LC
3. 2 3 LC
4. 23 LC

A solid cylinder of radius R rolls without slipping with a center of mass speed v0 = gR3 on a horizontal surface with a vertical edge, as shown in the figure. Here, g is the acceleration due to the gravity. At the moment when the cylinder loses contact with the surface due to rotation around the corner, the speed of its center of mass is: [figure]

1. 0
2. 5gR7
3. gR15
4. 3gR7

A double convex lens made of glass of refractive index 1.5 and radii of curvature of the curved surfaces 20 cm each is immersed in a liquid of refractive index nL. The correct plot showing the variation of the power, in the units of diopter (D), as a function of nL is:

1. [figure]
2. [figure]
3. [figure]
4. [figure]

A particle is thrown with a speed v from a point O at an angle with the horizontal plane such that it passes through the point P at a height of 1 m and horizontal distance of 5 m from O, as shown in the figure. If acceleration due to gravity is g ms-2, then the correct statement(s) is/are: [figure]

1. If = 45 , then v = 5 g2 ms-1.
2. If = 45 , the particle reaches its maximum height before it reaches P.
3. If = 30 , the particle reaches its maximum height after reaching P.
4. If = -1 ( 15 ), then v = 125 g ms-1.

A quasi-static cycle of a monoatomic ideal gas contains an isothermal process (ab), followed by an isochoric process (bc) and an adiabatic process (ca) as shown in the figure. The volumes of the gas are V1 and V2 at a and b, respectively. If the cycle has heat input Qin and output Qout, then the efficiency of the cycle is defined as = Qin - QoutQin. The correct statement(s) is/are: [Given: 2 0.7] [figure]

1. If V2/V1 = 8, the heat released in the process bc is smaller than the heat absorbed in the process ab.
2. For a given value of V2/V1, does not depend on the temperature of the isothermal process.
3. If V2/V1 = 8, then the temperature of the gas at a is 4 times the temperature of the gas at c.
4. If V2/V1 = 8, then the pressure of the gas at a is 4 times the pressure of the gas at b.

A tank contains two immiscible liquids of densities 6 and 2 . The higher density liquid is filled up to a height L/2 from the bottom. A thin rod of density and length L is fully immersed and hinged at the bottom so that it can oscillate freely, as shown in the figure. If the rod is slightly disturbed from its equilibrium, the time period of small oscillations is 2 n Lg, where g is the acceleration due to the gravity. The value of n is: [figure]

As shown in the figure, five Carnot engines, each with efficiency and same number of cycles per unit time, are operating between six heat reservoirs. The amount of heat released per cycle by one engine is completely absorbed by the next engine. Consider Q0 to be the amount of heat absorbed per cycle by the first engine and W as the amount of total work done by all the engines per cycle, then the net efficiency of the system is found to be net = WQ0 = 211243. The value of is: [figure]

As shown in the figure, an insulated container is fitted with a thermally conducting but immovable partition (P1) and a freely movable but thermally insulated piston (P2). The partition P1 with thermal conductivity K, cross sectional area A and width x divides the container into two sections, S1 and S2, each containing one mole of a monoatomic gas. The piston P2 moves freely such that the gas in S2 is always at the atmospheric pressure. Initially, the difference between the temperatures of S1 and S2 is T0. The time it takes for the temperature difference to become T02 is nxR/KA, where R is the universal gas constant. The value of n is: [ Given: 2 0.7 ] [figure]

A hollow, right circular cone of base radius R and height h, with its tip at the origin is rotating about the Z-axis with an angular velocity , as shown in the figure. The cone carries a total charge Q uniformly distributed on its curved surface. The magnitude of magnetic field at a point (0, 0, z), where z R and z h, is n 04 QR2 z3. The value of n is: [figure]

List-I shows four configurations made of straight and semi-circular narrow tubes containing air. A sound wave of wavelength = 0.29 m enters these structures at the point S and a sound detector is placed at D. Between the points S and D, the sound travels only through the tubes. List-II contains the possible smallest values of l (refer to the figures) for which the detector D records maximum amplitude. Ignore effects of sharp corners. [Given (15 ) = 0.97] Choose the option that best describes the match between the entries in List-I to those in List-II.

1. P→4, Q→3, R→5, S→1
2. P→4, Q→3, R→1, S→5
3. P→3, Q→4, R→1, S→2
4. P→3, Q→4, R→5, S→2

List-I contains four conducting loops lying in the XY plane, as shown in the figures. The loops are rotating about Z axis passing through the point O with time period T in clockwise direction. The region x > 0 contains a uniform magnetic field B in the +z direction. List-II contains the qualitative variation of the induced current i(t) for each of these loops. Choose the option which describes the correct match between the entries in List-I to those in List-II.

1. P → 5, Q → 4, R → 1, S → 3
2. P → 3, Q → 2, R → 5, S → 4
3. P → 3, Q → 2, R → 1, S → 4
4. P → 5, Q → 1, R → 2, S → 3

List-I shows four planar structures made of uniform solid rods each of mass m and length l. In the List-II the possible moment of inertia of these structures about an axis OCO', which lies in the plane of the structures, are given. Choose the option that describes the correct match between the entries in List-I to those in List-II.

1. P→5, Q→1, R→4, S→2
2. P→1, Q→3, R→4, S→2
3. P→5, Q→3, R→2, S→1
4. P→5, Q→4, R→2, S→1

An ideal gas (0.5 mol), initially at 2 bar pressure, is compressed at a constant temperature of 600 K in two steps: first, against a constant external pressure of P bar (2 < P < 8), and then against constant external pressure of 8 bar. At each step, the compression is stopped only when the pressure of the gas becomes equal to the external pressure. The total work done on the gas in these steps is W. Considering all possible values of P (2 < P < 8) and taking the gas constant as R (in J K-1 mol-1), the minimum value of |W| (in J) is

1. 207R
2. 600R
3. 630R
4. 900R

The correct order of dipole moments for the given species is

1. BF3 = NH4+ < NF3 < NH3
2. BF3 < NH4+ < NF3 < NH3
3. NH4+ < BF3 < NH3 < NF3
4. BF3 < NH4+ < NH3 < NF3

The 2s and the 2p orbital energies of hydrogen atom are E2s(H) and E2p(H), respectively. The 2s and the 2p orbital energies of lithium atom are E2s(Li) and E2p(Li), respectively. The correct option(s) about the orbital energies is(are)

1. E2s(Li) < E2p(Li)
2. E2s(H) = E2p(H)
3. E2p(H) < E2s(Li)
4. E2s(H) > E2s(Li)

Correct statement(s) about the compounds X, Y and Z is(are) MnO2 + Conc. HCl MnCl2 + (greenish yellow gas)X + H2O NH3 + (excess)X Y + HCl X + (excess)F2 573 K Z

1. X is used for sterilizing drinking water.
2. Y has a planar structure.
3. Z is used in the enrichment of 235U.
4. Y is a stronger Lewis base than ammonia.

Reaction of PtF6 with oxygen (O2) gas results in the formation of an ionic compound, X+Y-. Correct statement(s) is(are)

1. The bond order of X+ is 1.5.
2. Valence d-orbitals of the metal ion in X+Y- has 5 electrons.
3. PtF6 acts as an oxidant in this reaction.
4. PtF6 acts as a fluorinating agent in this reaction.

Two cylinders, both fitted with frictionless pistons, are filled with mixtures of He and Ar gases. In the first cylinder, the masses of He and Ar are m1 and m2, respectively. In the second cylinder, the masses of He and Ar are m2 and m1, respectively. The molar mass of Ar is 10 times the molar mass of He. The external pressure applied by the piston on the first cylinder needs to be 5 times that on the second cylinder so that the volume of the gas mixtures in both the cylinders are equal at the same temperature. Assuming He and Ar behave like ideal gases, the value of (m1/m2) is .

The total number of all possible isomers for the square planar complex with formula K[M(NCS)(NO2)(gly)] is . (M = metal ion and gly = NH2CH2COO-)

List-I contains various physical/chemical processes, and List-II contains combinations of changes in enthalpy ( H) and entropy ( S). Match each entry in List-I to the appropriate entry in List-II, and choose the correct option.

1. P → 2; Q → 3; R → 5; S → 4
2. P → 4; Q → 3; R → 5; S → 1
3. P → 2; Q → 5; R → 1; S → 4
4. P → 2; Q → 5; R → 1; S → 3

Consider the following species: SOCl2, XeOF4, ClF3, ClF5, XeF5+, SO32-, XeF3+, SF4 List-I contains different molecular shapes and List-II contains total number of species with the same molecular shapes from the given species. Match each entry in List-I with the appropriate entry in List-II and choose the correct option.

1. P → 1; Q → 2; R → 5; S → 3
2. P → 5; Q → 4; R → 2; S → 3
3. P → 3; Q → 2; R → 1; S → 4
4. P → 1; Q → 3; R → 5; S → 4

For a reversible reaction R P, at constant temperature, both the forward and the backward reactions are first order elementary reactions with rate constants kf and kb, respectively. At time zero, the concentration of R is [R]0 and the concentration of P is zero. At any given time, [R] and [P] are the concentrations of R and P, respectively. If kb = 4kf, the correct graphical representation of the reaction is

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Treatment of buta-1,3-diyne with NaNH2 (2 equivalents), followed by reaction with excess of trans- CH3-CH=CH-CH2-Br gives X as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in X is .

The List-II contains products obtained from the reaction of compounds in List-I with O3/Zn-H2O followed by cyclization (via more stable enolate) in the presence of aqueous NaOH. Match each entry in List-I with appropriate entry in List-II and choose the correct option.

1. P ⟶ 2; Q ⟶ 4; R ⟶ 1; S ⟶ 3
2. P ⟶ 3; Q ⟶ 4; R ⟶ 5; S ⟶ 2
3. P ⟶ 2; Q ⟶ 1; R ⟶ 5; S ⟶ 3
4. P ⟶ 3; Q ⟶ 5; R ⟶ 4; S ⟶ 2

Match the major products obtained in the reactions given in List-I with the corresponding structures in List-II and choose the correct option.

1. P → 2; Q ⟶ 1; R → 5; S ⟶ 4
2. P → 1; Q ⟶ 2; R → 4; S ⟶ 5
3. P → 1; Q ⟶ 2; R → 3; S ⟶ 4
4. P → 2; Q ⟶ 1; R → 3; S ⟶ 5

Considering LiBH4 reduces an ester group to the corresponding alcohol and does not reduce a carboxylic acid group, the correct statement about the major products P, Q, R and S is [figure]

1. P & Q are identical, and R & S are diastereomers.
2. P & Q are diastereomers, and R & S are identical.
3. P & Q are diastereomers, and R & S are diastereomers.
4. P & Q are identical, and R & S are identical.

In the following reaction sequence, Q, R, S and T are the major products. [figure] The correct statement(s) about Q, R, S and T is(are)

1. S on warming with ammoniacal AgNO3 results in the formation of silver mirror.
2. Q on treatment with Cl2(excess)/UV gives gammaxane.
3. T is a heterocyclic compound.
4. R on acid catalyzed intramolecular cyclization followed by treatment with Zn-Hg/HCl gives 9,10-dihydroxyanthracene.

The sum of total number of carbonyl groups ( >C=O ) present in the major products X and Y in the following reactions is . [figure]

Consider the function f : (0, ) (- , ) given by f(x) = x e(x) - x + 1 . Then which one of the following statements is TRUE ?

1. The derivative of the function f is decreasing in the interval (0, 1)
2. The function f has a local maximum at some point a (0, )
3. The function f has a local minimum at some point b (0, )
4. The function f has NEITHER a point of local maximum NOR a point of local minimum in the interval (0, )

Let P be the point on the parabola y = x2 such that the slope of the tangent to the parabola at the point P is 4 . Let Q be the point in the first quadrant lying on the circle x2 + y2 = 2 such that the slope of the tangent to the circle at the point Q is -1 . Let R be the point in the first quadrant lying on the ellipse x2 + 4y2 = 8 such that the slope of the tangent to the ellipse at the point R is - 12 . Then the radius of the circle passing through the points P, Q and R is

1. 10
2. 5
3. 52
4. 2 5

Which one of the following matrices can be obtained by performing elementary row transformations on the 3 3 identity matrix ?

1. bmatrix 1 & 1 & 1 \ 1 & 1 & 1 \ 1 & 1 & 1 bmatrix
2. bmatrix 1 & 1 & 1 \ 2 & 3 & 4 \ 1 & 2 & 1 bmatrix
3. bmatrix 1 & 1 & 1 \ 2 & 3 & 4 \ 2 & 5 & 8 bmatrix
4. bmatrix 1 & 1 & 1 \ -1 & 1 & 2 \ 0 & 2 & 3 bmatrix

Considering only the principal values of the inverse trigonometric functions, the value of -1( (-11)) + 10 (2 -1 ( 1 2 ) ) + 10 (2 -1(2)) is

1. 3 + 7
2. 7
3. 4 + 7
4. 3 - 5

Suppose that Box I contains 6 red balls and 9 green balls, and Box II contains 8 red balls and 12 green balls. All the balls of Box I and Box II are mixed together and a ball is chosen at random from them. Let E1 be the event that the ball chosen belonged to Box I and let E2 be the event that the ball chosen belonged to Box II. Let F1 be the event that the ball chosen is red and let F2 be the event that the ball chosen is green. Then which of the following statements is (are) TRUE ?

1. The events E1 and F1 are independent
2. The events E2 and F2 are dependent
3. The conditional probability P(F1 E1) is equal to the conditional probability P(F1 E2)
4. The conditional probability P(F1 E1) is greater than the conditional probability P(F2 E2)

Let P be the plane such that it contains the straight line x - 12 = y - 33 = z + 21 and is perpendicular to the plane x + 2y + 3z = 4 . Let P1 be the plane which passes through the point (4, 2, 2) and is parallel to P . Then which of the following statements is (are) TRUE ?

1. The equation of the plane P is 7x - 5y + z = -10
2. The distance between the planes P and P1 is 30
3. The distance of the plane P from the origin is 2 3
4. The acute angle between the plane P and the plane 2x + 2y + z = 3 is -1 ( 13 3 )

Let R denote the set of all real numbers. Let f : R R be an arbitrary function and let g : R R be the function defined by g(x) = xf(x) , for all x R . Then which of the following statements is (are) TRUE ?

1. The function g is always continuous at x = 0
2. If f is continuous at x = 0 , then g is differentiable at x = 0
3. If g is differentiable at x = 0 , then f is continuous at x = 0
4. If g is differentiable at x = 0 , then x 0 f(x) exists

Consider the matrix M = bmatrix 2 & -1 \ 1 & 0 bmatrix . Let p, q, r, s, a, b, c and d be integers such that M26 = bmatrix p & q \ r & s bmatrix and k=126 Mk = bmatrix a & b \ c & d bmatrix . Then which of the following statements is (are) TRUE ?

1. There exists a 2 2 invertible matrix N with real entries such that MN = N bmatrix 1 & 1 \ 0 & 1 bmatrix
2. The value of a is 378
3. For any two given integers m and n, there exist unique integers x and y such that px + qy = m and rx + sy = n
4. For each positive real number t, the system of linear equations (a + t)x + by = 1 cx + (d + t)y = -1 has a unique solution

Let S = \1, 2, 3, , 10\ . Consider the set X = \R : R is an equivalence relation on the set S such that R has exactly 42 elements\ . Then the number of elements in X is .

Consider the function f : (- 2, 2 ) (- , ) defined by f(x) = (|x| + |x - 1|) x + [x x] , where [x x] is the greatest integer less than or equal to x x . Let be the total number of points in the interval (- 2, 2 ) at which f is NOT continuous, and let be the total number of points in the interval (- 2, 2 ) at which f is NOT differentiable. Then the value of + is .

The number of ways to distribute 10 identical red pens and 14 identical blue pens among four persons such that each person gets 6 pens, is .

Let = (1 - 2 ( 11 ) ) (1 - 2 ( 3 11 ) ) (1 - 2 ( 9 11 ) ) (1 - 2 ( 27 11 ) ) (1 - 2 ( 81 11 ) ). Then the value of 5 - 2 is .

Match each entry in List-I to the correct entry in List-II and choose the correct option.

1. (P) → (1), (Q) → (2), (R) → (5), (S) → (4)
2. (P) → (3), (Q) → (1), (R) → (4), (S) → (5)
3. (P) → (1), (Q) → (2), (R) → (4), (S) → (5)
4. (P) → (2), (Q) → (3), (R) → (5), (S) → (4)

Match each entry in List-I to the correct entry in List-II and choose the correct option.

1. (P) → (2), (Q) → (5), (R) → (3), (S) → (4)
2. (P) → (5), (Q) → (3), (R) → (2), (S) → (4)
3. (P) → (5), (Q) → (4), (R) → (1), (S) → (3)
4. (P) → (4), (Q) → (3), (R) → (2), (S) → (5)

For real numbers , , , and , consider the matrix M = bmatrix & 1 2 & - 1 2 \ 1 3 & & 1 3 \ & & bmatrix . Suppose that MMT = I , where MT is the transpose of the matrix M, and I is the 3 3 identity matrix. Let u = i + 1 3 j + k , v = 1 2 i + j + k and w = - 1 2 i + 1 3 j + k . Match each entry in List-I to the correct entry in List-II and choose the correct option.

1. (P) → (5), (Q) → (4), (R) → (2), (S) → (1)
2. (P) → (4), (Q) → (5), (R) → (1), (S) → (2)
3. (P) → (5), (Q) → (3), (R) → (2), (S) → (1)
4. (P) → (5), (Q) → (4), (R) → (1), (S) → (2)

Match each entry in List-I to the correct entry in List-II and choose the correct option.

1. (P) → (3), (Q) → (4), (R) → (1), (S) → (2)
2. (P) → (3), (Q) → (2), (R) → (1), (S) → (5)
3. (P) → (3), (Q) → (2), (R) → (4), (S) → (5)
4. (P) → (4), (Q) → (1), (R) → (2), (S) → (3)