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Content Curator updated | Updated On - Mar 7, 2023

JEE Main 2021 B.E./B.Tech Question Paper- July 20, 2021- Afternoon was rated to be moderately difficult by the expert coaching institutions. The exam was the second exam of the JEE Main 3rd Session. A large contributing factor to the moderate difficulty of the exam was the Mathematics section, which featured tricky and lengthy questions, especially from Probability and Differential Calculus. The second in terms of difficulty was the Physics section, featuring a significant amount of questions from Mechanics and Modern Physics. The difficulty level of the Chemistry section was equivalent to the Physics section, in terms of complexity and theory-based questions; the biggest contributor to the Chemistry section was Organic Chemistry (I and II). Candidates preparing for JEE Main 2022, can download the question papers with answer key PDFs for July 20, 2021, Afternoon session from below:

JEE Main B.E./B.Tech Question Paper- July 20, 2021 Afternoon

JEE Main 2021 Question paper JEE Main 2021 Answer Key
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JEE Main 2021 B.E./B.Tech Question Paper July 20 (Afternoon Session): Paper Analysis

JEE Main 2021 B.E./B.Tech Paper on July 20 Forenoon Session was conducted between 3.00 PM to 6.00 PM, the paper analysis for each unit is as follows.

Subject Topic Number of Questions
Physics Electrodynamics 3
Heat and Thermodynamics 3
Mechanics 13
Modern Physics 8
Optics 1
SHM and Waves 2
Chemistry Inorganics Chemistry I 3
Inorganics Chemistry II 4
Organic Chemistry I 7
Organic Chemistry II 9
Physical Chemistry I 5
Physical Chemistry II 2
Mathematics Binomial Theorem 2
Coordinate Geometry 2
Differential Calculus 4
Integral Calculus 2
Permutation and Combination 3
Probability 2
Vector and 3D 2
Statistics 2
Quadratic Equations 3
Mathematical Reasoning 2
Trigonometry 2
Matrix and Determinants 2
Fundamental of Mathematics 2

For detailed Question Paper Analysis, visit- JEE Main Question Paper Analysis

JEE Main 2021 Questions with Solutions

1 According to Bohr's atomic theory :- (A) Kinetic energy of electron is ∝Z2/n2. (B) The product of velocity (v) of electron and principal quantum number (n), 'vn' ∝Z2. (C) Frequency of revolution of electron in an orbit is ∝Z3/n3. (D) Coulombic force of attraction on the electron is ∝Z3/n4. Choose the most appropriate answer from the options given below:
2 Complete combustion of 1.80g of an oxygen containing compound (CxHyO2) gave 2.64g of CO2 and 1.08g of H2O. The percentage of oxygen in the organic compound is:
3 Out of the following, which type of interaction is responsible for the stabilisation of ∝ -helix structure of proteins?
4 (A) HOCl + H2O→ H3O+ Cl− + O2
(B) I+ H2O+ 2OH → 2I + 2H2O + O2
Choose the correct option.
5 Which of the following equation depicts the oxidizing nature of H2O2?
6 Given below are two statements:
Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements, choose the most appropriate answer from the options given below.
7 Which of the following reaction/s will not give p− aminoazobenzene?
8 In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked $A , B , C , D$ and $E$. The transitions $A, B$ and $C$ respectively represent :
9 Four identical particles of equal masses $1 kg$ made to move along the circumference of a circle of radius $1 m$ under the action of their own mutual gravitational attraction. The speed of each particle will be :
10 If an emitter current is changed by $4 mA ,$ the collector current changes by $3.5 mA$. The value of $\beta$ will be
11 Match List -I with List -II
12 Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is ' $\alpha^{\prime}$. The metal sheet is heated uniformly, by a small temperature $\Delta T ,$ so that its new temperature is $T +\Delta T$. Calculate the increase in the volume of the metal box.
13 A cube of side 'a' has point charges $+ Q$ located at each of its vertices except at the origin where the charge is $-Q$. The electric field at the centre of cube is:

JEE Main B.E/ B. Tech Question Paper with Answer Key PDFs

Candidates should try and practice as many previous year question papers as possible. Collegedunia has provided links for JEE Main B.E/ B. Tech Question Paper with Answer Key PDFs below:

Alternate B.Tech Exam Question Papers

*The article might have information for the previous academic years, please refer the official website of the exam.

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