JEE Main 2021 B.Arch Question Paper with Answer Key (September 2

JEE Main 2021 B.Arch Question Paper for September 2 Afternoon session was said to be moderate in terms of difficulty level. As per the experts, the number of good attempts for JEE Main 2021 B.Arch Question Paper for the Sept 2 Afternoon Session was 58+.

The Aptitude section was found to be easy by a majority of students.
Mathematics was a bit tricky and lengthy.
The drawing section was quite easy

Also Check: JEE Main 2024 Question Paper with Solution PDF Download

JEE Main B.Arch Question Paper- September 2, 2021 (Afternoon Session)

JEE Main 2021 Question Paper	JEE Main 2021 Answer Key
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JEE Main 2021 B.Arch Paper Analysis- September 2 (Evening Session)

Sections	Topics with Highest Weightage	Difficulty Level
Aptitude	Fact-Based Questions	Easy
Mathematics	Integrations, Matrices, Area bounded, Differentiation	Moderate
Drawing	Making a Composition out of a shape or drawing a building, Top and Front view	Easy

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 (C_xH_yO₂) 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 + H₂O₂→ H₃O⁺+ Cl⁻+ O₂ (B) I₂+ H₂O₂+ 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 Previous Year Question Paper with Answer Key PDFs

Previous year question papers are a good way to practice and improve skills for an exam, so Collegedunia has provided JEE Main Previous year Question Paper with Solutions PDF for the students to download.

JEE Main 2020 Question Paper	JEE Main 2019 Question Paper	JEE Main 2018 Question Paper
JEE Main Physics Question Paper	JEE Main Maths Question Paper	JEE Main Chemistry Question Paper

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JEE Main Questions

1.
The mass of iron converted into $Fe_3O_4$ by the action of $18$ g of steam is: (Given: Molar mass of H, O and Fe are $1, 16$ and $56$ g mol$^{-1}$ respectively). Assume iron is present in excess.

$2.1$ g
$4.2$ g
$21$ g
$42$ g

View Solution

2.
$2.8 \times 10^{-3}$ mol of CO$_2$ is left after removing $10^{21}$ molecules from its $x$ mg sample. The mass of CO$_2$ taken initially is: Given: $N_A = 6.02 \times 10^{23}\,\text{mol}^{-1}$

98.3 mg
48.2 mg
196.2 mg
150.4 mg

View Solution

3.
What is the mole fraction of water in $10%$ by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and $14 \text{ g mol}^{-1}$ respectively.]

0.825
0.032
0.867
0.967

View Solution

4.
A solid sphere of mass $5$ kg and radius $10$ cm is kept in contact with another solid sphere of mass $10$ kg and radius $20$ cm. The moment of inertia of this pair of spheres about the tangent passing through the point of contact is ___________ kg$\cdot$m$^2$.

$0.18$
$0.63$
$0.72$
$0.36$

View Solution

5.
Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

0.1266; $3.812 \times 10^{22}$
0.0633; $3.812 \times 10^{22}$
0.1266; $7.6238 \times 10^{22}$
0.0633; $7.6238 \times 10^{22}$

View Solution

6.
Let the sum of the first n terms of an A.P. be $3n^2 + 5n$. Then the sum of squares of the first 10 terms of the A.P. is:

10220
12860
15220
19780

View Solution

JEE Main 2021 B.Arch Question Paper with Answer Key (September 2 - Afternoon Session)

JEE Main B.Arch Question Paper- September 2, 2021 (Afternoon Session)

JEE Main 2021 B.Arch Paper Analysis- September 2 (Evening Session)

JEE Main 2021 Questions with Solutions

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

Similar B.Tech Exam Question Papers

JEE Main Questions

1.
The mass of iron converted into \(Fe_3O_4\) by the action of \(18\) g of steam is: (Given: Molar mass of H, O and Fe are \(1, 16\) and \(56\) g mol\(^{-1}\) respectively). Assume iron is present in excess.

2.
$2.8 \times 10^{-3}$ mol of CO$_2$ is left after removing $10^{21}$ molecules from its $x$ mg sample. The mass of CO$_2$ taken initially is: Given: $N_A = 6.02 \times 10^{23}\,\text{mol}^{-1}$

3.
What is the mole fraction of water in \(10%\) by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and \(14 \text{ g mol}^{-1}\) respectively.]

4.
A solid sphere of mass $5$ kg and radius $10$ cm is kept in contact with another solid sphere of mass $10$ kg and radius $20$ cm. The moment of inertia of this pair of spheres about the tangent passing through the point of contact is ___________ kg$\cdot$m$^2$.

5.
Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

6.
Let the sum of the first n terms of an A.P. be $3n^2 + 5n$. Then the sum of squares of the first 10 terms of the A.P. is:

Comments

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JEE Main B.Arch Question Paper- September 2, 2021 (Afternoon Session)

JEE Main 2021 B.Arch Paper Analysis- September 2 (Evening Session)

JEE Main 2021 Questions with Solutions

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

Similar B.Tech Exam Question Papers

JEE Main Questions

1.The mass of iron converted into \(Fe_3O_4\) by the action of \(18\) g of steam is: (Given: Molar mass of H, O and Fe are \(1, 16\) and \(56\) g mol\(^{-1}\) respectively). Assume iron is present in excess.

2.$2.8 \times 10^{-3}$ mol of CO$_2$ is left after removing $10^{21}$ molecules from its $x$ mg sample. The mass of CO$_2$ taken initially is: Given: $N_A = 6.02 \times 10^{23}\,\text{mol}^{-1}$

3.What is the mole fraction of water in \(10%\) by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and \(14 \text{ g mol}^{-1}\) respectively.]

4.A solid sphere of mass $5$ kg and radius $10$ cm is kept in contact with another solid sphere of mass $10$ kg and radius $20$ cm. The moment of inertia of this pair of spheres about the tangent passing through the point of contact is ___________ kg$\cdot$m$^2$.

5.Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

6.Let the sum of the first n terms of an A.P. be $3n^2 + 5n$. Then the sum of squares of the first 10 terms of the A.P. is:

Comments

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1.
The mass of iron converted into \(Fe_3O_4\) by the action of \(18\) g of steam is: (Given: Molar mass of H, O and Fe are \(1, 16\) and \(56\) g mol\(^{-1}\) respectively). Assume iron is present in excess.

2.
$2.8 \times 10^{-3}$ mol of CO$_2$ is left after removing $10^{21}$ molecules from its $x$ mg sample. The mass of CO$_2$ taken initially is: Given: $N_A = 6.02 \times 10^{23}\,\text{mol}^{-1}$

3.
What is the mole fraction of water in \(10%\) by weight (w/w) of aqueous urea solution? [Given: Molar mass of H, O, C and N are 1, 16, 12 and \(14 \text{ g mol}^{-1}\) respectively.]

4.
A solid sphere of mass $5$ kg and radius $10$ cm is kept in contact with another solid sphere of mass $10$ kg and radius $20$ cm. The moment of inertia of this pair of spheres about the tangent passing through the point of contact is ___________ kg$\cdot$m$^2$.

5.
Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are

6.
Let the sum of the first n terms of an A.P. be $3n^2 + 5n$. Then the sum of squares of the first 10 terms of the A.P. is: