JEE Main was conducted on August 3 by the National Testing Agency. The August session was conducted only for the students who couldn't be able to appear for the exam due heavy rain. There was no change in the overall question pattern. A total of 100 questions were listed in JEE Main 2021 B.Tech (August 3, 2021- Forenoon Session).
JEE Main 2021 B.E./B.Tech Question Paper- August 3 (Forenoon)
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JEE Main 2021 B.E./B.Tech Question Paper- Paper Analysis
- The exam was conducted in CBT (computer based test) mode. NTA alloted 180 minutes the paper
- A total of 90 questions were listed in JEE Main 2021 B.Tech
- Students were supposed to attempt only 75 questions out of 90
- It was mandatory for the students to attempt 25 questions from each section (Physics, Chemistry, and Matjematics)
Follow the below-mentioned to know the important topics, contributed in JEE Main B.Tech-
| Physics |
- Current Electricity, Electrostatics, Electromagnetic Induction
- Error in Measurement
- Heat and Thermodynamics
- Rectilinear motion, Circular Motion
- Optics
- Semiconductors
- Electromagnetic Waves and Communication
|
| Chemistry |
- Chemical Bonding
- p block elements
- Coordination Compounds
- Aromatic Compounds
- Mole Concept
|
| Biology |
- Coordinate Geometry
- Complex Numbers
- Differential Calculus
- Integral Calculus
- Quadratic Equations
- Vectors and 3D
- Trigonometry
|
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 B.E./B.Tech 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.E./B.Tech year wise and subject wise question paper links with answer key PDFs are provided below:
Similar B.Tech Question Papers Links
*The article might have information for the previous academic years, please refer the official website of the exam.
