JEE Main Question Paper 29 January 2025 (Available) LIVE Updates: Shift 1 memory-based questions with answer key

The memory-based JEE Main Question Paper 29 January 2025 for Shift 1 and Shift 2 along with the answer keys can be checked here. Download JEE Main today's paper for Physics, Chemistry, and Mathematics subejcts  here.

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JEE Main Question Paper 29 January 2025 (Available) LIVE Updates: Shift 1 memory-based questions with answer key

JEE Main Question Paper 29 January 2025: The last day of JEE Mains 2025 Session 1 Paper is being conducted on January 29, with two shifts conducted in the morning and afternoon. The National Testing Agency (NTA) organized the exam in Paper 1 (B.Tech) CBT mode across various test centres nationwide for 5 days (10 shifts) with Paper 2 (for B.Arch and B.Plan) is going to be held on January 30. As candidates eagerly await the official release of the question papers and answer keys, we bring you live updates on memory-based questions and solutions of JEE Main 2025 January 29 Shift 1 and 2. This analysis is based on feedback from candidates and insights from subject matter experts.

The memory-based questions for both shifts, along with their unofficial answer keys, are being provided by various reputed coaching institutes. These resources help candidates assess their performance and estimate their probable scores.

JEE Main Question Paper 29 January 2025 Shift 1

Candidates can access subject-wise questions along with the unofficial answer key solutions for the morning session Day 1 Paper 1 (B.Tech) exam below-

JEE Main Today's Shift 1 Physics Paper

  • Assertion: At the peak of mountain, time period of pendulum increases
    Reason: Time period of pendulum increases with decrease in g
  • The velocity of a particle moving on a straight line varies with time as v=At2 Bt/C+ t1 where A, B, and C are constants. Find the dimension of ABC. 
  • A pendulum of mass m/2 is released from a given situation. Find the speed of another pendulum after the collision. (e=1)
  • The graph between wavelength (λ)of incident light and Kinetic Energy (K.E) of photoelectron in photoelectric effect is 
  • Identify the logic gate represented by circuit shown below.
Check More: JEE Main 2025 January 29 Shift 1 Physics Question Paper with Answer Key Solutions (Available)

JEE Main Today's Shift 1 Chemistry Paper

  • Which of the following is animal starch?
  • Statement-1: Correct order of ionic radius for Mg2+, Na+, O2- & F-is F-> O2-> Na+ > Mg2+
    Statement-2: Correct order of magnitude of gain Enthalpy for 17th group follows order CI > F > Br > I (Magnitude only)
  • Calculate the total number of sigma and π bond in the given molecule?
  • Chromite ore + Na2CO3 + O2 → insoluble product containing Fe.
    Calculate the molar mass of insoluble product formed. (Given: Molar mass of Cr = 52 g/mol, Na = 23 g/mol, Fe = 56 g/mol, 0 = 16 g/mol)
  • Consider the following complexes-
    1. [Mn(CN)6]4-
    2. [Fe(CN)6]4-
    3. [Fe(CN)6]3-
    4. [Co(CN)6]3-
    Correct order of CFSE (Δ0) will be
Check MoreJEE Main 29 January 2025 Shift 1 Chemistry Question Paper with Answer Key Solutions (Available)

JEE Main Today's Shift 1 Mathematics Paper

  • The minimum value of n for which the number of integer terms in the binomial expansion of (71/3 + 111/2) is 183, is
  • lim (n→0) ∑ (k = 1 to n) [(k3 + 6k2 + 11k +5)/(k + 3)! = ?
  • Sum of first three terms of an AP with integral common difference is 54 and sum of first twenty terms lies between 1600 to 1800, find a11.
  • Area enclosed by y ≥ |x - 1|, y + |x| ≤ 3, x2 ≤ 2y - 3 is A, then 6A is (in sq. units)
  • Find I = 80 0π/2 [(sinx + cosx) / (9sinx + 16cosx)]dx

Check More: JEE Main 2025 January 29 Mathematics Question Paper with Answer Key Solutions (Available)

Also download | JEE Main Question Paper January 2025 (All days and shifts)

JEE Main Question Paper 29 January 2025 Shift 2

For the afternoon session, examinees can access the memory-based questions for Physics, Chemistry, and Mathematics along with the answer key solutions below.

JEE Main Today's Shift 2 Physics Paper

  • An equiconvex lens is cut into two ways as shown. If the focal length of the parts are as mentioned in the diagram. Find L1/L2
  • A solenoid of radius 10 cm carrying current 0.29 A and having total 200 turns. If magnetic field inside solenoid is 2.9 x 10-9 Find length of solenoid
  • Three identical particles, each of mass m move under the influence of mutual attraction forces. Initially they are on the vertices of an equipotential triangle of side 'a' and have equal speed v direct towards the adjacent particles as shown. The net angular momentum about the centre just before collision is 
  • Two particles of same mass are performing SHM vertically with two different springs of spring constants K1 and K2. If amplitude of both is same. Find ratio of the maximum speed of two particles.
  • A physical quality Q is given as Q = ab4/cd, if the percentage error is a,b,c and d are 2%, 1%, 2% and 1% the % error in Q will be

Check More: JEE Main 2025 January 29 Shift 1 Physics Question Paper with Answer Key Solutions (Available)

JEE Main Today's Shift 2 Chemistry Paper

  • Which of the following form most stable carbocation?
  • Number of σ and π bonds respectively in hex-1-en-4-yne are
  • 0.41 g of BaSO4 is obtained from 0.2 g of organic compound in Carius method. What is the percentage of sulphur present in organic compound?
  • Which element in group 15 has the lowest Ionisation energy?
  • The number of benzenoid structural isomers having molecular formula C9H12 which do not give Baeyer's reagent test is?
Check MoreJEE Main 29 January 2025 Shift 1 Chemistry Question Paper with Answer Key Solutions (Available)

JEE Main Today's Shift 2 Mathematics Paper

  • If the letters of the word "KANPUR" are arranged in dictionary, then the 440th word is
  • If 3107 is divided by 23, then remainder is
  • Let aij = (√2)i+j, A = [aij]3x3 If sum of third row of A2 is α + β√2, then α + βis
  • Let f(x) = 0x t(t2 - 3t + 20) dt, x ∈ (1, 3) and range of f(x) is (α, β), then α + β is equal to
  • lim (x→0) [ cosecx ((2cos2x + 3cosx)1/2 - (cos2x + sinx + 4)1/2 ] = ?
Check More: JEE Main 2025 January 29 Mathematics Question Paper with Answer Key Solutions (Available)

While these resources provide a fair estimate of performance, students should wait for the official answer key by NTA for accurate score calculations. The official key is expected to be released within a week, followed by a provisional results announcement.

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Upcoming Important Dates of JEE Mains 2025 Session 1

JEE Main Question Paper 29 January 2025 LIVE Updates: Shift 1, 2 memory-based questions with answer key

  • Jan 30, 2025 05:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Subject-Wise Q3

    Physics Ques: Assertion: On increasing the pressure, the volume decrease is more in an isothermal process than in an adiabatic process.
    Reason: Adiabatic process is given by PV-1 

    Physics Ans: Assertion is correct and Reason is correct

    Chemistry Ques: Which of the following is an essential amino acid?

    Chemistry Ans: Valine

    Mathematics Ques: Let the line L be (x - 1)/1 = (y - 4)/3 = (z - 7)/5 = λ and foot of perpendicular from (1, -2, -1) to L is (α, β, γ), then find the value of α + β + γ.

    Mathematics Ans: -102/35

  • Jan 30, 2025 05:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Subject-Wise Q3

    Physics Ques: Which of two physical quantities have same dimensions?

    Physics Ans: Angular momentum and Planck's constant

    Chemistry Ques: The correct order of melting point of d-block elements is:

    Chemistry Ans: Fe > Mn

    Mathematics Ques: If z1 lies on | z - 8 + 2i | = 1 and z2 lies on | z - 2 - 6i | = 2, then | z1 - z2 |min is (where i = √-1)

    Mathematics Ans: 7

  • Jan 30, 2025 04:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Mathematics Q2

    Ques: If the exhaustive values of a for which the equation 2x2 + (a - 5)x + 15 = 3a has no real roots is (α, β), then 14(α + β) | is equal to

    Ans: 56

  • Jan 30, 2025 04:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Chemistry Q2

    Ques: Consider the following thermochemical reactions and choose the correct option.
    C(diamond) → C(graphite) + x KJ
    C(diamond) + O2 → CO2 + y KJ
    C(graphite) + O2 → CO2 + z KJ

    Ans: x = y - z

  • Jan 30, 2025 03:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Physics Q2

    Ques: Two planet A and B are revolving around a massive start such that rA = 2rB and mA = 4√3 mB Find ratio of angular momentum of planet B to planet A.

    Ans: 1/ 2√3

  • Jan 30, 2025 03:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Mathematics Q1

    Ques: Area enclosed between the curves |y| = 1 - x2 and x2 + y2 = 1 is (π - α) sq. units, then 9α is

    Ans: 24

  • Jan 30, 2025 02:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Chemistry Q1

    Ques: Which of the following will give azo dye test?

    Ans: Aniline

  • Jan 30, 2025 02:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2 Physics Q1

    Ques: A capacitor  C1= 6μF, initially charged with a call of emf 5V is disconnected and connected to another capacitor C2= 6μF, which is initially neutral. The charges on C1 and C2 after connection are 

    Ans: 10μc, 20μc

  • Jan 30, 2025 01:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2: CollegeDekho Overall Difficulty Rating

    Based on the initial feedback received by the candidates, the overall difficulty level of Shift 2 was 6.06.

  • Jan 30, 2025 01:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2: CollegeDekho Difficulty Rating for Mathematics

    The CollegeDekho difficulty rating for Mathematics in JEE Main 29 January Question Paper 2025 is 7.8.

  • Jan 30, 2025 12:30 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2: CollegeDekho Difficulty Rating for Chemistry

    The CollegeDekho difficulty rating for Chemistry in JEE Main 29 January Question Paper 2025 is 6.4. 

  • Jan 30, 2025 12:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 2: CollegeDekho Difficulty Rating for Physics

    The CollegeDekho difficulty rating for Physics in JEE Main 29 January Question Paper 2025 is 4.

  • Jan 29, 2025 11:30 PM IST

    JEE Main Question Paper 29 January 2025: Expected Number of Good Attempts (Shift 2)

    The expected number of good attempts in JEE Main Shift 2 Question Paper 29 January 2025 is 44 to 51.

  • Jan 29, 2025 11:00 PM IST

    JEE Main Question Paper 29 January 2025: Was the Shift 2 paper time-consuming?

    According to the reviews submitted by the candidates, the Shift 2 paper was time-consuming as Chemistry consisted of a lot of concept-based questions, and the Mathematic section was quite calculative.

  • Jan 29, 2025 10:30 PM IST

    JEE Main Question Paper 29 January 2025: Mathematics High Weightage Topics (Shift 2)

    The high-weightage topics from Shift 2 Mathematics were as follows:

    • Conic Section
    • 3D Vector
    • Matrices and Determinants
    • Straight Line
    • Complex Numbers

  • Jan 29, 2025 10:00 PM IST

    JEE Main Question Paper 29 January 2025: Chemistry High Weightage Topics (Shift 2)

    The high-weightage topics from Shift 2 Chemistry were as follows:

    • Chemical Kinetics
    • Coordination Compound
    • Biomolecules
    • GOC
    • d and f Block Elements

  • Jan 29, 2025 09:40 PM IST

    JEE Main Question Paper 29 January 2025: Physics High Weightage Topics (Shift 2)

    The high-weightage topics from Shift 2 Physics were as follows:

    • Modern Physics
    • Ray Optics
    • Electrostatics
    • Capacitor
    • Thermodynamics

  • Jan 29, 2025 09:20 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Mathematics (Shift 2)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 1 Mathematics was Moderate.

  • Jan 29, 2025 09:00 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Chemistry (Shift 2)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 1 Chemistry was Moderate.

  • Jan 29, 2025 08:40 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Physics (Shift 2)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 2 Physics was Easy to Moderate.

  • Jan 29, 2025 08:20 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Mathematics Q2

    Ques: The number of 7 digit numbers made with the digits 1, 2, 3 such that sum of the digits is 11 is equal to

    Ans: 16

  • Jan 29, 2025 08:00 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Chemistry Q2

    Ques: Find the order of the reaction

    A+B → F

    if the mechanism of the reaction is given below:

    Step 1: A + B → D (slow)

    Step 2: D→C + E (fast)

    Step 3: C+E → F (fast)

    Ans: 2  


     

  • Jan 29, 2025 07:40 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Physics Q2

    Ques: A river is flowing with speed 9km/hr. Boat is going downstream-speed of boat in still water is 27km/hr. A person in boat throws a ball upwards with speed 10 m/s. Find range of the ball as seen by an observer at bank of river.

    Ans: 20 m

  • Jan 29, 2025 07:20 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Mathematics Q1

    Ques: If R be a relation defined on (0, π/2) such that xRy sec2x - tan2y = 1, then the relation R is

    Ans: Reflexive and transitive only

  • Jan 29, 2025 07:00 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Chemistry Q1

    Ques: What is the value of van't Hoff Factor for A2B if 30% of A2B is dissociated?

    Ans: 1.60 19 PM

  • Jan 29, 2025 06:40 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1 Physics Q1

    Ques: Statement I: Electromagnetic wave have both energy and momentum.

    Statement II: Rest mass of photon is zero.

    Ans: Statement I is correct Statement II is incorrect

  • Jan 29, 2025 06:20 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1: CollegeDekho Overall Difficulty Rating

    Based on the initial feedback received by the candidates, the overall difficulty level of Shift 1 was 6.0.

  • Jan 29, 2025 06:00 PM IST

    JEE Main Question Paper 29 January 2025: Shift 2 Ends

    The final shift of JEE Main 2025 Session 1 examination has concluded. Stay tuned for question paper analysis, and to know the memory-based question, and unofficial answers for the same.

  • Jan 29, 2025 05:40 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1: CollegeDekho Difficulty Rating for Mathematics

    The CollegeDekho difficulty rating for Mathematics in JEE Main 29 January Question Paper 2025 is 8.3.

  • Jan 29, 2025 05:20 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1: CollegeDekho Difficulty Rating for Chemistry

    The CollegeDekho difficulty rating for Chemistry in JEE Main 29 January Question Paper 2025 is 5.4.

  • Jan 29, 2025 05:00 PM IST

    JEE Main Question Paper 29 January 2025 Shift 1: CollegeDekho Difficulty Rating for Physics

    The CollegeDekho difficulty rating for Physics in JEE Main 29 January Question Paper 2025 is 4.4.

  • Jan 29, 2025 04:40 PM IST

    JEE Main Question Paper 29 January 2025: Expected Number of Good Attempts (Shift 1)

    The expected number of good attempts in JEE Main Shift 1 Question Paper 29 January 2025 is 49 to 53.

  • Jan 29, 2025 04:20 PM IST

    JEE Main Question Paper 29 January 2025: Was the Shift 1 paper time-consuming?

    According to the reviews submitted by the candidates, Shift 1 paper was not much time-consuming, except for the Mathematics section.

  • Jan 29, 2025 04:00 PM IST

    JEE Main Question Paper 29 January 2025: Mathematics High Weightage Topics (Shift 1)

    The high-weightage topics from Shift 2 Mathematics were as follows:

    • 3D Vector
    • Conic Section
    • Integration
    • Straight Line and Circle
    • Differential Calculus

  • Jan 29, 2025 03:40 PM IST

    JEE Main Question Paper 29 January 2025: Chemistry High Weightage Topics (Shift 1)

    The high-weightage topics from Shift 1 Chemistry were as follows:

    • Biomolecules
    • Chemical Bonding
    • Mole Concept
    • Named Reactions

  • Jan 29, 2025 03:20 PM IST

    JEE Main Question Paper 29 January 2025: Physics High Weightage Topics (Shift 1)

    The high-weightage topics from Shift 2 Physics were as follows:

    • Ray Optics
    • Electrostatics
    • Modern Physics
    • Projectile
    • Vertical Motion
    • Kinematics
    • Units and Dimensions
    • Magnetic Effects of Current

  • Jan 29, 2025 03:00 PM IST

    JEE Main Question Paper 29 January 2025: Shift 2 Starts

    Shift 2 or the final shift of JEE Main 2025 Session 1 examination has started. The shift will end at 6 PM.

  • Jan 29, 2025 02:30 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Mathematics (Shift 1)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 1 Mathematics was Moderate to Tough.

  • Jan 29, 2025 02:15 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Chemistry (Shift 1)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 1 Chemistry was Moderate.

  • Jan 29, 2025 02:00 PM IST

    JEE Main Question Paper 29 January 2025: Difficulty Level of Physics (Shift 1)

    Based on the initial feedback received by the candidates, the difficulty level of Shift 1 Physics was Easy to Moderate.

  • Jan 29, 2025 01:45 PM IST

    JEE Main Question Paper 29 January 2025: Expected Percentile Score for 100 to 130 Marks

    MarksPercentile
    130 marks95.18+ percentile
    120 marks93.9+ percentile
    110 marks92.28+ percentile
     
     

  • Jan 29, 2025 01:30 PM IST

    JEE Main Question Paper 29 January 2025: Expected Percentile Score for 140 to 160 Marks

    MarksPercentile
    160 marks97.74+ percentile
    150 marks97.08+ percentile
    140 marks96.2+ percentile
     
     

  • Jan 29, 2025 01:15 PM IST

    JEE Main Question Paper 29 January 2025: Expected Percentile Score for 170 to 190 Marks

    MarksPercentile
    190 Marks99.09+ percentile
    180 Marks98.72+ percentile
    170 Marks98.28+ percentile
     
     

  • Jan 29, 2025 01:00 PM IST

    JEE Main Question Paper 29 January 2025: Expected Percentile Score for 200 to 220 Marks

    MarksPercentile
    220 Marks99.66+ Percentile
    210 Marks99.52+ Percentile
    200 Marks99.32+ Percentile
     

  • Jan 29, 2025 12:45 PM IST

    JEE Main Question Paper 29 January 2025: Expected Percentile Score for 230 to 250 Marks

    MarksPercentile
    250 Marks99.99+ Percentile
    240 Marks99.84+ Percentile
    230 Marks99.76+ Percentile

  • Jan 29, 2025 12:30 PM IST

    Expected Most Important Topics in JEE Main Question Paper 29 January 2025

    The most number of questions might have appeared from Integration, Conic Section, Modern Physics, Gravitation, and Electric Circuits in Shift 1.

  • Jan 29, 2025 12:15 PM IST

    Expected Difficulty Level of JEE Main Question Paper 29 January 2025

    Based on all days, and shifts analysis, the subject-wise difficulty levels are as follows:

    • Physics: Moderate

    • Chemistry: Moderate

    • Mathematics: Moderate to Tough

  • Jan 29, 2025 12:00 PM IST

    JEE Main Question Paper 29 January 2025: Shift 1 Ends

    The first shift, or the second last JEE Main 2025 Session 1 examination, has now concluded. Soon, the analysis, question paper, and answer key will shared on the blog. Stay tuned!

  • Jan 29, 2025 11:45 AM IST

    JEE Main Question Paper 29 January 2025: Guidelines for Washroom

    • Only one candidate will be allowed for toilet break at one time.
    • After the toilet break is over, the candidates will undergo biometrics and frisking again.

  • Jan 29, 2025 11:30 AM IST

    JEE Main Question Paper 29 January 2025: Marks vs Expected Percentile (3)

    Marks Expected Percentile
    231 marks99.77+ percentile
    230 marks99.76+ percentile
    229 marks99.75+ percentile
    228 marks99.74+ percentile
    227 marks99.73+ percentile
    226 marks99.72+ percentile
    225 marks99.71+ percentile
    224 marks99.7+ percentile
    223 marks99.69+ percentile
    222 marks99.68+ percentile

  • Jan 29, 2025 11:15 AM IST

    JEE Main Question Paper 29 January 2025: Marks vs Expected Percentile (2)

    MarksExpected Percentile
    241 marks99.845+ percentile
    240 marks99.84+ percentile
    239 marks99.835+ percentile
    238 marks99.825+ percentile
    237 marks99.82+ percentile
    236 marks99.815+ percentile
    235 marks99.805+ percentile
    234 marks99.8+ percentile
    233 marks99.79+ percentile
    232 marks99.78+ percentile

  • Jan 29, 2025 11:00 AM IST

    JEE Main Question Paper 29 January 2025: Marks vs Expected Percentile (1)

    MarksExpected Percentile
    250 marks99.99+ percentile
    249 marks99.9+ percentile
    248 marks99.895+ percentile
    247 marks99.885+ percentile
    246 marks99.88+ percentile
    245 marks99.875+ percentile
    244 marks99.865+ percentile
    243 marks99.86+ percentile
    242 marks99.855+ percentile

  • Jan 29, 2025 10:45 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Mathematics Q5

    Ques: 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

    Ans: 20

  • Jan 29, 2025 10:30 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Chemistry Q5

    Ques: Which of the following give violet color in Borax bead test?

    Ans: Mn2+

  • Jan 29, 2025 10:15 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Physics Q5

    Ques: Energy of photon of wavelength λ is E0 which is equal to kinetic energy of proton of mass mp. The ratio of de Broglie wavelengths of proton and photon is

    Ans: 1/c√E0/2mp

  • Jan 29, 2025 10:00 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Mathematics Q4

    Ques: Let E1 : x2/9 + y2/4 = 1 be an ellipse and a series of ellipses are drawn in that Ei + 1 has the same centre, eccentricity as E1 and Ei + 1's major axis is the minor axis of Ei. If Si be the area of Ei, then ( (5/π) ∑ Si from i = 1 to ∞ ) is equal to

    Ans: 54

  • Jan 29, 2025 09:45 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Chemistry Q4

    Ques: Which of the following compounds have the same number of lone pair on central atomas CIF3

    Ans: XeF-5

  • Jan 29, 2025 09:30 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Physics Q4

    Ques: In a YDSE, the distance of the 10th bright fringe from the central maxima is 10 mm when light of wavelength used is 600 nm. Find the distance (in mm) of the 10th bright fringe from the central maxima if light of wavelength 660 nm is used instead.

    Ans: 11 mm

  • Jan 29, 2025 09:15 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Mathematics Q3

    Ques: 2an + 2 = 5an + 1 - 3an' prime where n = 0, 1, 2 If a0 = 3 and a1 = 4 then the find the value of ∑ ak from k = 1 to 100.

    Ans: 3a100 - 91

  • Jan 29, 2025 09:00 AM IST

    JEE Main Question Paper 29 January 2025: Shift 1 Begins

    Today is Day 5 of JEE Main 2025 examination. Shift 1 has begun now, 9 AM, and will conclude at 12 PM.

  • Jan 29, 2025 08:45 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Physics Q3

    Ques: 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.

    Ans: 0.375 mm2

  • Jan 29, 2025 08:30 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Mathematics Q2

    Ques: Let k1 and k2 be two randomly selected natural numbers. The probability that (i)k1 + (i)k2 is non-zero is (where i = √-1)

    Ans: 3/4

  • Jan 29, 2025 08:15 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 1 Chemistry Q2

    Ques: Statement 1: For Titration of oxalic acid using KMnO4, warming of acid solution is required whereas in case of Ferrous Ammonium Sulphate, it is done at room temperature.
    Statement 2: Fe2+ converts to Fe3+ ions during titration

    Ans: Statement 1 and Statement 2 are correct

  • Jan 29, 2025 08:00 AM IST

    JEE Main Question Paper 29 January 2025 Shift 1: Previous Day Physics Q2

    Ques: 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°.

    Ans: 3°

  • Jan 29, 2025 07:40 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Mathematics Q5

    Ques: Let P, be image of parabola P: y2 = 4x with respect to line x + y + 1 = 0. Let the line y + 5 = 0 intersect Pi at A and B. If a is the distance between A and B and d be the area of triangle SAB where S is the focus of parabola Pi. Then (a + d) is

    Ans: 20

  • Jan 29, 2025 07:20 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Chemistry Q5

    Ques: Consider the following oxides
    V2O3 , V2O4, V2O5
    Oxidation state of vanadium in amphoteric oxide is 

    Ans: +5

  • Jan 29, 2025 07:00 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Physics Q5

    Ques: Mass M and radius R of a planet is related with Mass Me and Radius Re of earth as Me= 8Mp and Re= 2Rp. If escape speed for each is 11.2 km/sec, then escape speed of the planet is 

    Ans: 5.6 m/sec

  • Jan 29, 2025 06:40 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Mathematics Q4

    Ques: If p is the number of possible values of r such that Tr, Tr+1, Tr+2 are three terms of (a + b)12 are in a geometric progression and if q is the sum of rational terms in the expansion of (31/4 + 41/3)12 then (p + q) is

    Ans: 283

  • Jan 29, 2025 06:20 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Chemistry Q4

    Ques: Consider the following statements
    Statement I: In law of octaves, elements were arranged in ascending order of their atomic numbers.
    Statement II: Lothar Meyer, plotted the physical properties against atomic weight.
    Choose the correct answer from the options given below.

    Ans: Both Statement I and II are incorrect

  • Jan 29, 2025 06:00 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Physics Q4

    Ques: A balloon system having mass m is moving up with acceleration a, find the mass to be removed from it to have acceleration 3a. (Neglect the volume of mass attached)

    Ans: ma/3a+g

  • Jan 29, 2025 05:40 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Mathematics Q3

    Ques: If p is the number of possible values of r such that Tr, Tr+1, Tr+2 are three terms of (a + b)12 are in a geometric progression and if q is the sum of rational terms in the expansion of (31/4 + 41/3)12 then (p + q) is

    Ans: 283

  • Jan 29, 2025 05:20 AM IST

    JEE Main Question Paper 29 January 2025: Previous Day Shift 2 Chemistry Q3

    Ques: Which of the following biomolecules doesn't contain C1- C4 glycosidic linkage

    Ans: Sucrose

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