JEE Main 2021 B.Tech was conducted on August 4 in two slots. The question paper comprises 90 questions (30 questions each section. Students were asked to attempt 75 questions (25 questions from each section). Go through the below-mentioned table to see the details of number of listed questions as per the section-
JEE Main 2021 B.E./B.Tech Question Paper- August 4 (Forenoon)
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JEE Main 2021 B.E./B.Tech- Paper Analysis
| Sections |
Question Frequency |
Carried Marks |
| Mathematics |
30 (25 questions to be attempted) |
100 |
| Physics |
30 (25 questions to be attempted) |
100 |
| Chemistry |
30 (25 questions to be attempted) |
100 |
| Total |
90 |
300 |
The question paper was a combination of both MCQs(Multiple Choice Questions) and Non-MCQs. A total of 60 MCQs and 15 Non-MCQs appeared in JEE Main 2022 B.Tech. Students were rewarded with 4 marks for every correct MCQ. 1 mark would be reduced by every incorrect MCQ. No marks would be deducted for wrong Non-MCQs and unattempted questions.
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JEE Main 2021 Questions with Solutions
| 1 |
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: |
| 2 |
If $Y, K$ and $\eta$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters. |
| 3 |
Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be: |
| 4 |
An LCR circuit contains resistance of $110 \Omega$ and a supply of $220 V$ at $300 rad / s$ angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by $45^{\circ} .$ If on the other hand, only inductor is removed the current leads by $45^{\circ}$ with the applied voltage. The $rms$ current flowing in the circuit will be: |
| 5 |
Calgon is used for water treatment. Which of the following statement is $NOT$ true about Calgon? |
| 6 |
Statements about heavy water are given below
A. Heavy water is used in exchange reactions for the study of reaction mechanisms
B. Heavy water is prepared by exhaustive electrolysis of water
C. Heavy water has higher boiling point than ordinary water
D. Viscosity of $H _{2} O$ is greater than $D _{2} O$ |
| 7 |
Given below are two statements : Two photons having equal linear momenta have equal wavelengths. If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease. In the light of the above statements, choose the correct answer from the options given below. |
| 8 |
If an emitter current is changed by $4 mA ,$ the collector current changes by $3.5 mA$. The value of $\beta$ will be |
| 9 |
In Freundlich adsorption isotherm, slope of AB line is: |
| 10 |
In the given figure, a mass $M$ is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is $k$. The mass oscillates on a frictionless surface with time period $T$ and amplitude $A$. When the mass is in equilibrium position, as shown in the figure, another mass $m$ is gently fixed upon it. The new amplitude of oscillation will be: |
| 11 |
The correct order of bond dissociation enthalpy of halogens is: |
| 12 |
Which of the following are isostructural pairs?
A. $SO _{4}^{2-}$ and $CrO _{4}^{2-}$
B. $SiCl _{4}$ and $TiCl _{4}$
C. $NH _{3}$ and $NO _{3}^{-}$
D. $BCl _{3}$ and $BrCl _{3}$ $BCl _{3}$ and $BrCl _{3}$ |
JEE Main Previous Year Question Papers
Candidates can solve the question papers of the previous year to analyze their performance levels. To enhance the accuracy level, candidates are advised to solve JEE Main Question Papers daily. JEE Main B.Planning year wise and subject wise question paper links with answer key PDFs are provided below:
Similar B.Tech Exam Question Papers
*The article might have information for the previous academic years, please refer the official website of the exam.
