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JEE Main 20th July 2021 Paper Analysis by ALLEN Career Institute

NTA conducted the third session of the country’s largest engineering entrance exam- JEE Main 2021 for BE/ B.Tech on 20th July 2021 in 334 cities across the country and abroad.

The exam was conducted in two shifts in computer-based mode. Based on the students’ feedback and the feedback received on CSAT, Brajesh Maheshwari Sir, Director of ALLEN Career Institute, concluded that the morning shift paper was lengthy. While Physics was the toughest, Chemistry was the easiest. Whereas, due to calculations involved in Maths, students took more time to solve the paper. Assertion – Reason-based questions were asked in Chemistry and Physics. This time students have been given the facility that if the language of the question is not clear in the regional or English language, then the student can change the medium of the paper as per convenience. This process can be followed any number of times. This facility has been given to the students for the first time in JEE Main paper. In the evening shift, Chemistry was easy; Maths was lengthy, while Physics was easier than in the morning.

JEE Main Chemistry Paper Analysis

Chemistry paper was easy in the morning shift. According to the students, the chemistry paper was NCERT based. In Physical Chemistry, most of the questions were from the integer section. Some questions were asked from the Mole concept. Apart from this, the topics of Liquid Solution, Thermo Kinetics were covered in Physical. Organic chemistry questions came from IUPAC, GOC, Polymer. Apart from this, Tollens Reagent, Williamson Ether Synthesis and some other good questions were asked from the Regents.
Similarly, in Inorganic Chemistry most of the questions were asked from Block Chemistry, CFT and VBT in Coordination, Distillation from Metallurgy, Copper Nitrate in Salt Analysis, Green Chemistry in Environment.
In the evening shift, questions were asked from Chemistry Everyday life and Environmental, Uses of Hydrogen in Inorganic Chemistry, Coordination Chemistry, and Reaction of Copper Plus Two with Potassium Iodide and Reaction in Organic Chemistry. In Physical Chemistry, topics like KSP, Surface Chemistry were covered in Equilibrium.

JEE Main Physics Paper Analysis

According to the students, this paper was between tough to moderate, and questions were asked from NCERT’s 11th and 12th class syllabus. There were only numerical-based questions, while there were no theoretical questions. The maximum number of questions were asked from Mechanics. 2 questions were from Optics, 2-3 from Alternating Current, 1 from EMI and 2-3 questions from Modern Physics. At the same time, there were no questions from Fluid, Magnetism, and SHM. There was a question related to the zener diode from Principal of Communication. The evening shift consisted of both theory and numerical questions. In this, 1 question was asked from Optics, 2-3 from Mechanics, 2-3 from Electrostatic and 2 from Modern Physics. Question related to zener diode was also asked in the evening shift.

JEE Main Maths Paper Analysis

In the Maths paper, some questions were from previous years’ JEE Main and Advanced exams. Due to the paper being lengthy, students spent maximum time in solving Maths paper. Most of the questions came from Calculus and Vector 3D. According to the students, there were no questions on differentiation in the morning shift. Apart from this, 3-4 questions came from the conic section. Questions were asked from Relation of sets, Binomial, Probability, Mean and Boolean Expression. In the evening shift, all the questions in the integer part were lengthy, while the objective section consisted of easy and difficult questions.


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