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Exam Details

JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT

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Questions 90
Duration 180 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
16 Qs
Mechanics
13 Qs
Physical Chemistry
11 Qs
Inorganic Chemistry
10 Qs
Electricity
10 Qs
Organic Chemistry
9 Qs
Calculus
8 Qs
Modern Physics
5 Qs
Coordinate Geometry
5 Qs
Optics
2 Qs
Trigonometry
1 Qs

Subtopic distribution

Some Basic Concepts Of Chemistry
3 Qs
Permutations And Combinations
3 Qs
Straight Lines And Pair Of Straight Lines
3 Qs
Matrices And Determinants
3 Qs
Atoms And Nuclei
2 Qs
P Block Elements
2 Qs
Sequences And Series
2 Qs
Circle
2 Qs
3D Geometry
2 Qs
Simple Harmonic Motion
2 Qs
Capacitor
2 Qs
Work Power And Energy
2 Qs

Difficulty distribution

Medium 48 53.3%
Easy 41 45.6%
Hard 1 1.1%

Question type distribution

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

Syllabus

Full Syllabus

Sample questions from this paper

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

1
2021 · Physics · Modern Physics · Atoms And Nuclei
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
A radioactive sample disintegrates via two independent decay processes having half lives \(T_{1/2}^{(1)}\) and \(T_{1/2}^{(2)}\) respectively. The effective half-life T1/2 of the nuclei is :
A
None of the above
B
\({T_{1/2}} = T_{1/2}^{(1)} + T_{1/2}^{(2)}\)
C
\({T_{1/2}} = {{T_{1/2}^{(1)}T_{1/2}^{(2)}} \over {T_{1/2}^{(1)} + T_{1/2}^{(2)}}}\)
D
\({T_{1/2}} = {{T_{1/2}^{(1)} + T_{1/2}^{(2)}} \over {T_{1/2}^{(1)} - T_{1/2}^{(2)}}}\)
2
2021 · Chemistry · Inorganic Chemistry · S Block Elements
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
Match List - I with List - II

List - I
 List - II
(a) $$Ca{(OCl)_2}$$ (i) Antacid
(b) $$CaS{O_4}.{1 \over 2}{H_2}O$$ (ii) Cement
(c) $$CaO$$ (iii) Bleach
(d) $$CaC{O_3}$$ (iv) Plaster of paris


Choose the most appropriate answer from the options given below :
A
(a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
B
(a) - (iii), (b) - (ii), (c) - (iv), (d) - (i)
C
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
D
(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
3
2021 · Mathematics · Algebra · Binomial Theorem
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
Let (1 + x + 2x2)20 = a0 + a1x + a2x2 + .... + a40x40. Then a1 + a3 + a5 + ..... + a37 is equal to
A
220(220 \(-\) 21)
B
219(220 \(-\) 21)
C
219(220 \(+\) 21)
D
220(220 \(+\) 21)
4
2021 · Physics · Modern Physics · Communication Systems
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
Match List - I with List - II.

List - I

(a) 10 km height over earth's surface

(b) 70 km height over earth's surface

(c) 180 km height over earth's surface

(d) 270 km height over earth's surface

List - II

(i) Thermosphere

(ii) Mesosphere

(iii) Stratosphere

(iv) Troposphere
A
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
C
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
D
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
5
2021 · Chemistry · Inorganic Chemistry · P Block Elements
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is :
A
3
B
0
C
2
D
1
6
2021 · Mathematics · Algebra · Sequences And Series
JEE MAIN 2021 ONLINE 18TH MARCH MORNING SHIFT
If \(\alpha\), \(\beta\) are natural numbers such that
100\(\alpha\) \(-\) 199\(\beta\) = (100)(100) + (99)(101) + (98)(102) + ...... + (1)(199), then the slope of the line passing through (\(\alpha\), \(\beta\)) and origin is :
A
540
B
550
C
530
D
510