JEE Main Session-1 Exam 2025 : 28 January Shift-1 Analysis, Review & Question Paper with Answer Key

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JEE Main 2025 January 28 Shift 1 exam is over now. JEE Main 2025 January 28 Shift 1 student feedback and analysis is updated here. Additionally, memory-based unofficial JEE Main 2025 answer key and question paper with solutions for January 28 exam is also uploaded.

Candidates can check the responses of JEE Main January 28, 2025 Shift 1 students, difficulty level of questions, paper analysis, memory-based question paper with answer key and solutions, etc.

Shift 2 will start at 03:00 PM and end at 06:00 PM. Candidates will have to show their JEE Main 2025 Session 1 admit card to enter the JEE Main 2025 exam centre for the shift 2 exam. Additionally, candidates will have to bring a government-issued photo identity card and a passport-sized photograph. Proper adherence to these entry requirements is necessary to attend the exam.

Paper 1 for BE/BTech candidates in JEE Main 2025 will be held on January 22, 23, 24, 28 and 29. Paper 2A and 2B for BArch and BPlan candidates are scheduled on January 30, 2025 from 3:00 PM to 6:30 PM.

👉 JEE Mains 2025 (28 January Shift-1 Physics) Question Paper and Answer Key (Available)

👉 JEE Mains 2025 (28 January Shift-1 Chemistry) Question Paper and Answer Key (Available)

👉 JEE Mains 2025 (28 January Shift-1 Mathematics) Question Paper and Answer Key (Available)

JEE Main Session 1 Memory Based Paper 2025

Exam Dates	Physics	Chemistry	Maths
22 January 2025	Shift - 1	Shift - 1	Shift - 1
22 January 2025	Shift - 2	Shift - 2	Shift - 2
23 January 2025	Shift - 1	Shift - 1	Shift - 1
23 January 2025	Shift - 2	Shift - 2	Shift - 2
24 January 2025	Shift - 1	Shift - 1	Shift - 1
24 January 2025	Shift - 2	Shift - 2	Shift - 2
28 January 2025	Shift - 1	Shift - 1	Shift - 1
28 January 2025	Shift - 2	Shift - 2	Shift - 2
29 January 2025	Shift - 1	Shift - 1	Shift - 1
29 January 2025	Shift - 2	Shift - 2	Shift - 2

JEE Main 2025 January 28 Shift 1 Question Paper Analysis - OUT

As per the initial reaction of the candidates after the JEE Main 28 Jan shift 1 exam:

Maths was lengthy and tough
Physics was difficult. The questions were very lengthy and no direct questions were asked.
Chemistry was easy to moderate and NCERT-based
Overall the exam in shift 1 was Difficult.
Candidates are saying that this is the most difficult shift of the JEE Main 2025 Jan session until now.
In Maths, many questions came from topics like: Vector and 3D, Special Sequence, Area under the Curve, Differential Equations, Matrices, Probability
In Chemistry, many questions came from topics like: Salt, periodic table, ionisation energy comparison
In Physics, many questions came from topics like: Rotation, Moment of Inertia, Modern Physics, Resistance, Semi-conductor, Fluid Mechanics, Potential, Cector, Electricity, Carnot Engine

JEE Main Exam Analysis 2025 - Difficulty level

Candidates can check refer to the table provided below to check JEE Main Jan 28 shift 1 exam analysis.

Subject	Difficulty level
Physics	Moderate to difficult
Chemistry	Easy to moderate
Maths	Moderate

JEE Main January 28 Shift 1 Important Topics

Subject	Topics asked
Physics	Fluid mechanics Rotational motion Carton engine Equipotential Thermodynamics 1 Q from Logic Gates 1 Q from Semiconductor 1 Q from Electrostatics based on Equipotential surface 2 Q from Fluid Mechanics 1 Q from Nucleus 2-3 Q from the Current electricity 1 Q from out of syllabus based on Carnot Engine
Chemistry	Period table Inorganic portion was tough Organic had very less weightage -- 2-3 question were from periodic classication of elements based on arranging ionisation energy. 1 question was asked from chemical kinetics. 1 question was asked from General Organic Chemistry.
Maths	Vector 3d Area under curve Variance Probability Conic sections -- Probability: 1 question Vectors and 3D Geometry: 3 questions Circles: 1 question Dierential Equations: 1 question

Subject

Topics asked

Physics

Fluid mechanics
Rotational motion
Carton engine
Equipotential
Thermodynamics

1 Q from Logic Gates
1 Q from Semiconductor
1 Q from Electrostatics based on Equipotential surface
2 Q from Fluid Mechanics
1 Q from Nucleus
2-3 Q from the Current electricity
1 Q from out of syllabus based on Carnot Engine

Chemistry

Period table
Inorganic portion was tough
Organic had very less weightage
--

2-3 question were from periodic classication of elements based on arranging ionisation energy.
1 question was asked from chemical kinetics.
1 question was asked from General Organic Chemistry.

Maths

Vector 3d
Area under curve
Variance
Probability
Conic sections
--
Probability: 1 question
Vectors and 3D Geometry: 3 questions
Circles: 1 question
Dierential Equations: 1 question

Physics

Chemistry

Maths

JEE Main 28 January 2025 Physics Shift 1 Question Paper with Answer Key Solutions

Here is JEE Main 25 January 2025 Physics question paper with answer key solutions for Shift 1.

Q.No.	Question	Answers
1	Find equivalent resistance across A to B.	R/9
2	A uniform wire of linear charge density λ is placed along the y-axis. The locus of equipotential surface is	x ²+ z ²= Constant
3	Which of following reaction is correct? (Where symbols have their usual meanings)	n→p+e ^-+ v ^-
4	The graph of root mean square velocity versus temperature is
5	A coin is placed at the bottom of a hemispherical container filled with a liquid of refractive index μ. Find the least refractive index if the coin is visible to an observer at E.	√2
6	In the given figure, the square and the triangle have same resistance per unit length. Find the ratio of their resistances about adjacent corners.	27/32
7	Assertion: Work done by the central force is independent of path. Reason: Potential energy is associated with every force.	Both Assertion and Reason are incorrect.
8	There is a smooth ring of radius R in vertical plane. A spring of natural length R and elastic constant K is vertical across along a diameter. The free end is connected to bead of mass m and when slightly disturbed it reaches point C with speed where V is
9	The equivalent logic gate for the circuit shown below is
10	Surface mass density varies as σ = σ ₀x/ab for the given plane sheet. Find the position of centre of mass for the distribution given	2a/3, b/2
11	ζ ₁, ζ ₂and ζ ₃are the efficiencies of the three Carnot engines E ₁, E ₂and E ₃operating between temperatures shown in the figure. Choose the correct option relating to the efficiencies.	ζ ₂+ ζ ₃> ζ ₁
12	A simple pendulum of length l and both of mass m is placed on smooth horizontal surface as shown. When electric field of strength E is switched on, the bob passes the x-axis with speed v then	v = √qEl/m
13	Statement 1: Velocity of sound in solids is more compared to that in gases. Statement 2: Bulk modules of gas are more than that of solids.	Statement 1 is correct Statement 2 is incorrect.
14	The dimensions of Young's modules of elasticity per unit length is M ^aL ^bT ^cthen \|a + b + c\| is	3
15	To capacitor C ₁and C ₂are connected across same battery and store energies U ₁and U ₂respectively at steady state. Choose the correct option by observing the graph of charge vs time shown below.	C ₁<C ₂, U ₁<U ₂
16	Energy of photon of wavelength λ is E ₀which is equal to kinetic energy of proton of mass m _p. The ratio of de Broglie wavelengths of proton and photon is	1/c√E ₀/2m _p
17	In a YDSE, the distance of the 10 ^thbright fringe from the central maxima is 10 mm when light of wavelength used is 600 nm. Find the distance (in mm) of the 10 ^thbright fringe from the central maxima if light of wavelength 660 nm is used instead.	11 mm
18	The energy associated with a cylindrical region due to an EM wave E = 100sin(kx - ωt) is u ₀. Find the equation of EM wave for which a cylinder of same length and half the diameter (as previous one) contains same energy U ₀.	200sin(kx-ωt)
19	The lengths of a rectangular sheet are measured from a screw gauge of pitch 0.75 mm and number of division on circular scale = 15. Find maximum possible error in measurement of area.	0.375 mm ²
20	There are two prisms of refractive indices of 1.54 and 1.72 respectively. If ray is not deviating after passing through two prisms, then find prism angle of second prism if prism angle of first prism is 4°.	3°

JEE Main 25 January 2025 Chemistry Shift 1 Question Paper with Answer Key Solutions

Here is JEE Main 24 January 2025 Chemistry question paper with answer key solutions for Shift 1.

Q.No.	Question	Answers
1.	What is the rate of reaction for releasing CO ₂(g) with aq. NaHCO ₃among the following?	1>3>2
2.		i> ii> iii> iv
3.
4.	Which of the following pair have square pyramidal shape?	BrF ₅, XeOF ₄
5.	Which of the following set of quantum numbers have same energy?	c,d
6	Δ ₁H of H(g) is 222kJ/ mol, Δ ₁H of O(g) is 250kJ/ mol, Δ ₁H of H ₂O is -248kJ/ mol. what is the value of Bond Energy of the O-H bond in H ₂O in kJ/ mol.	471
7	70% of mass solution of HNO ₃is taken heavy density 1.41 gm/ml. Calculate morality (Rounded off to nearest integer)	16
8		CH ₃CH ₂CH ₂NO ₂& CH ₃CH ₂CH ₂NC
10		A(Q), B(R), C(P), D(S)
11	Among the following the incorrect order of atomic radius is	B> Al> Mg> F
12	1g of a non electrolyte solute (MW=256g/mol) dissolved in 50g of solvent, freezing point of solution lowered by 0.40K. Calculate the molal depression constant of solvent.	5
13	A compound contains 14.4% Carbon, 1.2% Hydrogen, and 84.4% Chlorine. Calculate empirical formula mass of compound. (Molar mass of C=12, H=1, Cl=35.5)	84
14
15		Statement I is incorrect and Statement II is correct
16	Which of the following has same energy in absence of electric and magnetic field for hydrogen atom	2s, 2p
17	Which of the following reactions /tests can be used to distinguish acetaldehyde and acetone	D and E only
18	Which of the following give violet color in Borax bead test?	Mn ²⁺
19	Which of the following compounds have the same number of lone pair on central atomas CIF ₃	XeF ^-₅
20	Statement 1: For Titration of oxalic acid using KMnO ₄, warming of acid solution is required whereas in case of Ferrous Ammonium Sulphate, it is done at room temperature. Statement 2: Fe ²⁺converts to Fe ³⁺ions during titration	Statement 1 and Statement 2 are correct

JEE Main 25 January 2025 Mathematics Shift 1 Question Paper with Answer Key Solutions

Here is JEE Main 25 January 2025 Mathematics question paper with answer key solutions for Shift 1:

Q.No.	Question	Answers
1	If ^π/2∫ _-π/2[ 96(x ²+ cosx)/(1 + e ^x) ] dx = απ ³+ β (where α, β are positive integers), then find the value of α + β.	100
2	Number of ways to form 5 digit numbers greater than 50000 with the use of digits 0, 1, 2, 3, 4, 5, 6, 7 such that sum of first and last digit is not more than 8, is equal to	5119
3	If the image of the point P(4, 4, 3) in the line (x - 1)/2 = (y - 2)/1 = (z - 1)/1 is Q (α, β, γ), then find the value of (α + β + γ).	31/3
4	If ∫ ₀^xt ^.f(t)dt = x ²f(x) and f(2) = 3, then f(6) equals to	1
6	cos(sin ^-1(3/5) + sin ^-1(5/13) + sin ^-1(33/65)) = ?	0
7	The sum of squares of real roots of the equation: x ²+ \|2x - 3\| - 4 = 0 is	6(2 - √2)
8	Area bounded by 0 < y < 2\|x\| + 1 and y > x ²+ 1 is (in sq. units)	8/3
9	There are 2 bad oranges mixed with 7 good oranges and 2 oranges are drawn at random. Ket X be the number of bad oranges. The variance of X is	49/162
10	2a _{n + 2}= 5a _{n + 1}- 3a _n'prime where n = 0, 1, 2 If a ₀= 3 and a ₁= 4 then the find the value of ∑ a _kfrom k = 1 to 100.	3a ₁₀₀- 91
11	Let k ₁and k ₂be two randomly selected natural numbers. The probability that (i) ^k1+ (i) ^k2is non-zero is (where i = √-1)	3/4
12	In ∆ABC, A(4sinθ, 4cosθ), B(-2cosθ, 0) and C(2, 2sinθ). If locus of centroid is (3x - 2) ²+ (3y) ²= α, then α is	20
13	Let E ₁: x ²/9 + y ²/4 = 1 be an ellipse and a series of ellipses are drawn in that E _i+ 1 has the same centre, eccentricity as E ₁and E _{i + 1}'s major axis is the minor axis of E _i. If Si be the area of E _i, then ( (5/π) ∑ S _ifrom i = 1 to ∞ ) is equal to	54

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