JEE Main Question Paper 2026 January 21 LIVE Updates (AVAILABLE): Memory-based questions Physics, Chemistry and Mathematics

JEE Main Question Paper 2026 January 21 (LIVE):Day 1 of JEE Main 2026 Session 1 is today, January 21, 2026. As per the format, the exam is being held through CBT mode in two shifts: Shift 1 from 9 AM to 12 PM, and Shift 2 from 3 PM to 6 PM. Since the exam is held through CBT, the actual question papers will not be available; however, memory-based questions from both shifts will be added here. If you are appearing for the JEE Main 2026 Session 1 exam, the JEE Main Question Paper 2026 January 21 will help you to predict the expected questions and the level of difficulty. So, follow the live blog here to collect the memory-based questions from Physics, Chemistry, and Mathematics from both shifts here, along with additional details regarding the expected topics and questions in the upcoming shifts, as well as expected weightage for the topics in the upcoming shifts.Also Read |JEE Main Unofficial Answer Key 21 January 2026 LIVE UpdatesJEE Main Question Paper 2026 January 21 Shift 2: Memory-based questionsThe memory-based questions for Physics, Chemistry and Mathematics, as per the JEE Main Question Paper 2026 January 21 Shift 2, are here.Physics QuestionsQuestionsAnswersIn a circuit, there is a battery with internal resistance r and an emf E, which is connected to an external load resistance R as shown. Find the value of R so that the maximum power dissipates across R.R=rRefractive index of the prism is √2. What should be the angle of incidence for a light ray such that the emerging ray gazes out of the surface?90°Keeping the significant figures in view, the sum of the physical quantities 5.01 m, 153.2 m, and 0.123 m is205.3mThe total length of potentiometer wire AB is shown in the arrangement in the fig. If P is the point where the galvanometer shows zero reading, then the length of AP is:30The Kinetic energy of a simple harmonic oscillating with an angular frequency of 176 rad/s. The frequency of the simple harmonic oscillator is - Hz (π=22/7)88Mathematics QuestionsQuestionsAnswers10416Let y2= 16x, from point (16, 16), a focal chord passes. Point (α,β) divides the focal chord in the ratio 2:3, then the minimum value ofα+β is11Also Read |JEE Main 2026 January 21 Expected Marks vs Percentile AnalysisChemistry QuestionsQuestionsAnswersStatement I: The correct order for radius is Al>Mg>Mg2+>Al3+Statement II: Atomic size always depends on electronegativityChoose the correct optionBoth statements I and II are incorrect5The rms speed of oxygen molecules at 47°C is equal to that of Hydrogen molecules kept at ____°C-2531 g of an organic compound produces 1.49 g of Mg2P2O7. Determine % of Phosphorous?45%-46%Following 4 molecules are given, and among them, one is optically active. Find the percentage of carbon in that compound:a. n-propyl Chlorideb. iso-propyl Chloridec. iso-butyl Chlorided. Secondary-butyl chlorideOption d.Also Read |JEE Main 21 January 2026 Toughest Shift AnalysisLive Session - JEE Main 2026 Shift 2 Exam Analysis January 21JEE Main Question Paper 2026 January 21 Shift 1: Memory-based questionsFor Physics, Chemistry and Mathematics, the memory-based questions as per the JEE Main Question Paper 2026 January 21 Shift 1 are here.Physics QuestionsQuestionsAnswersA rod of mass m and length l is attached to two ideal strings. Find tension in the left string just after the right string is cutmg/4Which logic gate is given in the figure?NAND gateML-1T-4Find the heat produced in the external circuit (AB) in one second.(21X15)/16 (Not given as an option)An α particle having kinetic energy 7.7 MeV is approaching a fixed gold nucleus (atomic number is 79). Find the distance of closest approach.1.72 nmAlso Read |JEE Main Predicted Percentile Score January 2026 Session 1 LIVE UpdatesMathematics QuestionsQuestionsAnswers4112/3The sum of roots of the equation lx-1l2-5lx-1l+6=0 is4Also Read |JEE Main Difficulty Level Analysis 2026 January 21: CollegeDekho difficulty level rating based on memory-based questionsChemistry QuestionQuestionsAnswersFind A8In 'S' estimation 0.7 g of an organic compound gives 1 g BaSO4in Carius method. What is the % of 'S' in the compound?19.61Which one among the following resonating structures is not correct?Option AStatement A: but-2-e show O.I.Statement B: Propanol & Propanone are F.G.I.Statement C: Pentane & 2,2- Dimethyl Propane are C.I correctly statementOnly B and C% of N in E= ?20Also Read |JEE Main 2026 January 21 Exam AnalysisJEE Main Paper Review 2026 January 21 (Available)As per the questioning pattern, each of the three sections: Physics, Chemistry, and Mathematics will have 25 questions. There will be five numerical value-based questions from each section and twenty multiple-choice questions. Each correct answer will add 4 marks, and an incorrect answer will deduct 1 mark.Live Session - JEE Main 2026 Shift 1 Exam Analysis January 21Also read |Subject Expert Percentile Prediction for 188 Marks in JEE Main 2026 Session 1Follow the live blog here to know the latest updates on the JEE Main 2026 January 21 exam for both shifts!