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Exam Details

JEE Main 2021 (Online) 25th February Morning Shift

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Questions 90
Duration 60 mins
Package IIT-JEE Main - Previous Year Papers

Paper pattern & analysis

Filter this paper by subject, topic or subtopic. Every graph updates from the selected questions.

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Showing all 90 questions in this paper.

Subject distribution

Physics
30 Qs
Chemistry
30 Qs
Mathematics
30 Qs

Topic distribution

Algebra
15 Qs
Mechanics
15 Qs
Physical Chemistry
11 Qs
Organic Chemistry
10 Qs
Calculus
10 Qs
Inorganic Chemistry
9 Qs
Electricity
9 Qs
Modern Physics
4 Qs
Coordinate Geometry
3 Qs
Trigonometry
2 Qs
Optics
2 Qs

Subtopic distribution

Heat And Thermodynamics
4 Qs
Application Of Derivatives
3 Qs
Matrices And Determinants
3 Qs
Alternating Current
3 Qs
Gravitation
3 Qs
Aldehydes Ketones And Carboxylic Acids
3 Qs
Sequences And Series
2 Qs
Electrostatics
2 Qs
Chemical Bonding And Molecular Structure
2 Qs
Some Basic Concepts Of Chemistry
2 Qs
Thermodynamics
2 Qs
Hydrocarbons
2 Qs

Difficulty distribution

Medium 64 71.1%
Easy 26 28.9%

Question type distribution

Multiple Choices 60 66.7%
Numerical Answer Type (NAT) 30 33.3%

Sample questions from this paper

Questions are selected across the paper subjects wherever the paper contains that variety.

1
2021 · Physics · Modern Physics · Communication Systems
JEE Main 2021 (Online) 25th February Morning Shift
Given below are two statements :

Statement I : A speech signal of 2 kHz is used to modulate a carrier signal of 1 MHz. The bandwidth requirement for the signal is 4 kHz.

Statement II : The side band frequencies are 1002 kHz and 998 kHz.

In the light of the above statements, choose the correct answer from the options given below :
A
Statement I is false but Statement II is true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false
D
Both Statement I and Statement II are true
2
2021 · Chemistry · Inorganic Chemistry · Hydrogen
JEE Main 2021 (Online) 25th February Morning Shift
Which of the following equation depicts the oxidizing nature of H2O2?
A
\(C{l_2} + {H_2}{O_2} \to 2HCl + {O_2}\)
B
\(KI{O_4} + {H_2}{O_2} \to KI{O_3} + {H_2}O + {O_2}\)
C
\(2{I^ - } + {H_2}{O_2} + 2{H^ + } \to {I_2} + 2{H_2}O\)
D
\({I_2} + {H_2}{O_2} + 2O{H^ - } \to 2{I^ - } + 2{H_2}O + {O_2}\)
3
2021 · Mathematics · Calculus · Application Of Derivatives
JEE Main 2021 (Online) 25th February Morning Shift
If the curves, \({{{x^2}} \over a} + {{{y^2}} \over b} = 1\) and \({{{x^2}} \over c} + {{{y^2}} \over d} = 1\) intersect each other at an angle of 90\(^\circ\), then which of the following relations is TRUE?
A
a \(-\) c = b + d
B
a + b = c + d
C
\(ab = {{c + d} \over {a + b}}\)
D
a \(-\) b = c \(-\) d
4
2021 · Physics · Modern Physics · Atoms And Nuclei
JEE Main 2021 (Online) 25th February Morning Shift
Two radioactive substances X and Y originally have N1 and N2 nuclei respectively. Half life of X is half of the half life of Y. After three half lives of Y, number of nuclei of both are equal. The ratio \({{{N_1}} \over {{N_2}}}\) will be equal to :
A
\({1 \over 8}\)
B
\({3 \over 1}\)
C
\({1 \over 3}\)
D
\({8 \over 1}\)
5
2021 · Chemistry · Inorganic Chemistry · P Block Elements
JEE Main 2021 (Online) 25th February Morning Shift
The correct statement about B2H6 is :
A
Its fragment, BH3, behaves as a Lewis base.
B
All B\(-\)H\(-\)B angles are of 120\(^\circ\).
C
The two B\(-\)H\(-\)B bonds are not of same length.
D
Terminal B\(-\)H bonds have less p-character when compared to bridging bonds.
6
2021 · Mathematics · Trigonometry · Height And Distance
JEE Main 2021 (Online) 25th February Morning Shift
A man is observing, from the top of a tower, a boat speeding towards the lower from a certain point A, with uniform speed. At that point, angle of depression of the boat with the man's eye is 30\(^\circ\) (Ignore man's height). After sailing for 20 seconds, towards the base of the tower (which is at the level of water), the boat has reached a point B, where the angle of depression is 45\(^\circ\). Then the time taken (in seconds) by the boat from B to reach the base of the tower is :
A
\(10(\sqrt 3 + 1)\)
B
\(10(\sqrt 3 - 1)\)
C
10
D
\(10\sqrt 3\)