JEE Main 2021 (Online) 24th February Evening Shift

Paper was held on
Wed, Feb 24, 2021 9:30 AM

## Chemistry

The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :

View Question The incorrect statement among the following is :

View Question In polymer Buna-S : 'S' stands for :

View Question Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : Hydr

View Question Given below are two statements :Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important

View Question Which one of the following compounds is non-aromatic?

View Question According to Bohr's atomic theory :(A) Kinetic energy of electron is $$ \propto {{{Z^2}} \over {{n^2}}}$$.(B) The produc

View Question Most suitable salt which can be used for efficient clotting of blood will be :

View Question Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of Hg

View Question The correct set from the following in which both pairs are in correct order of melting point is :

View Question What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene?

View Question The calculated magnetic moments (spin only value) for species $${[FeC{l_4}]^{2 - }}$$, $${[Co{({C_2}{O_4})_3}]^{3 - }}$$

View Question
Which of the following reagent is suitable for the preparation of the product in the above reaction?

View Question Math List - I with List - II.
List I (Metal)
List II (Ores)
(a)
Aluminium
(i)

View Question What is the correct order of the following elements with respect to their density?

View Question Match List - I and List - II.
List I
List II
(a)
Valium
(i)
Antifertility

View Question The correct shape and $$I - I - I$$ bond angles respectively in $$I_3^ - $$ ion are :

View Question The diazonium salt of which of the following compounds will form a coloured dye on reaction with $$\beta$$-Naphthol in N

View Question Match List - I and List - II.
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View Question Match List - I with List - II.
List I (Salt)
List II (Flame colour wavelength)
(a)

View Question The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces

View Question Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is ______

View Question The solubility product of PbI2 is 8.0 $$\times$$ 10$$-$$9. The solubility of lead iodide in 0.1 molar solution of lead n

View Question 1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of aceta

View Question The volume occupied by 4.75 g of acetylene gas at 50$$^\circ$$C and 740 mmHg pressure is __________ L. (Rounded off to t

View Question Assuming ideal behaviour, the magnitude of log K for the following reaction at 25$$^\circ$$C is x $$\times$$ 10$$-$$1. T

View Question C6H6 freezes at 5.5$$^\circ$$C. The temperature at which a solution of 10g of C4H10 in 200g of C6H6 freeze is __________

View Question Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3.33 h

View Question The magnitude of the change in oxidising power of the $$MnO_4^ - /M{n^{2 + }}$$ couple is x $$\times$$ 10$$-$$4 V, if th

View Question The total number of amines among the following which can be synthesized by Gabriel synthesis is __________.

View Question ## Mathematics

If a curve y = f(x) passes through the point (1, 2) and satisfies $$x {{dy} \over {dx}} + y = b{x^4}$$, then for what va

View Question For which of the following curves, the line $$x + \sqrt 3 y = 2\sqrt 3 $$ is the tangent at the point $$\left( {{{3\sqrt

View Question Let A and B be 3 $$\times$$ 3 real matrices such that A is symmetric matrix and B is skew-symmetric matrix. Then the sys

View Question The value of the integral, $$\int\limits_1^3 {[{x^2} - 2x - 2]dx} $$, where [x] denotes the greatest integer less than o

View Question Let a, b, c be in arithmetic progression. Let the centroid of the triangle with vertices (a, c), (2, b) and (a, b) be $$

View Question Let a, b$$ \in $$R. If the mirror image of the point P(a, 6, 9) with respect to the line $${{x - 3} \over 7} = {{y - 2}

View Question For the system of linear equations:$$x - 2y = 1,x - y + kz = - 2,ky + 4z = 6,k \in R$$,consider the following statement

View Question Let f(x) be a differentiable function defined on [0, 2] such that f'(x) = f'(2 $$-$$ x) for all x$$ \in $$ (0, 2), f(0)

View Question The negation of the statement $$ \sim p \wedge (p \vee q)$$ is :

View Question For the statements p and q, consider the following compound statements :(a) $$( \sim q \wedge (p \to q)) \to \sim p$$(b

View Question If $$n \ge 2$$ is a positive integer, then the sum of the series $${}^{n + 1}{C_2} + 2\left( {{}^2{C_2} + {}^3{C_2} + {}

View Question Let f be a twice differentiable function defined on R such that f(0) = 1, f'(0) = 2 and f'(x) $$ \ne $$ 0 for all x $$ \

View Question Let $$f:R \to R$$ be defined as$$f(x) = \left\{ {\matrix{
{ - 55x,} & {if\,x < - 5} \cr
{2{x^3} - 3{x^2}

View Question If P is a point on the parabola y = x2 + 4 which is closest to the straight line y = 4x $$-$$ 1, then the co-ordinates o

View Question The vector equation of the plane passing through the intersection of the planes $$\overrightarrow r .\left( {\widehat i

View Question The angle of elevation of a jet plane from a point A on the ground is 60$$^\circ$$. After a flight of 20 seconds at the

View Question The probability that two randomly selected subsets of the set {1, 2, 3, 4, 5} have exactly two elements in their interse

View Question A possible value of $$\tan \left( {{1 \over 4}{{\sin }^{ - 1}}{{\sqrt {63} } \over 8}} \right)$$ is :

View Question If the curve y = ax2 + bx + c, x$$ \in $$R, passes through the point (1, 2) and the tangent line to this curve at origin

View Question The area of the region : $$R = \{ (x,y):5{x^2} \le y \le 2{x^2} + 9\} $$ is :

View Question Let a point P be such that its distance from the point (5, 0) is thrice the distance of P from the point ($$-$$5, 0). If

View Question If the variance of 10 natural numbers 1, 1, 1, ....., 1, k is less than 10, then the maximum possible value of k is ____

View Question Let $$\lambda$$ be an integer. If the shortest distance between the lines x $$-$$ $$\lambda$$ = 2y $$-$$ 1 = $$-$$2z and

View Question If a + $$\alpha$$ = 1, b + $$\beta$$ = 2 and $$af(x) + \alpha f\left( {{1 \over x}} \right) = bx + {\beta \over x},x \n

View Question If the area of the triangle formed by the positive x-axis, the normal and the tangent to the circle (x $$-$$ 2)2 + (y $$

View Question Let $$i = \sqrt { - 1} $$. If $${{{{\left( { - 1 + i\sqrt 3 } \right)}^{21}}} \over {{{(1 - i)}^{24}}}} + {{{{\left( {1

View Question For integers n and r, let $$\left( {\matrix{
n \cr
r \cr
} } \right) = \left\{ {\matrix{
{{}^n{C_r},} &am

View Question The number of the real roots of the equation $${(x + 1)^2} + |x - 5| = {{27} \over 4}$$ is ________.

View Question The students S1, S2, ....., S10 are to be divided into 3 groups A, B and C such that each group has at least one student

View Question The sum of first four terms of a geometric progression (G. P.) is $${{65} \over {12}}$$ and the sum of their respective

View Question ## Physics

In the given figure, a body of mass M is held between two massless springs, on a smooth inclined plane. The free ends of

View Question If the source of light used in a Young's double slit experiment is changed from red to violet :

View Question The logic circuit shown above is equivalent to :

View Question Figure shows a circuit that contains four identical resistors with resistance R = 2.0$$\Omega$$, two identical inductors

View Question A particle is projected with velocity v0 along x-axis. A damping force is acting on the particle which is proportional t

View Question An X-ray tube is operated at 1.24 million volt. The shortest wavelength of the produced photon will be :

View Question If one mole of an ideal gas at (P1, V1) is allowed to expand reversibly and isothermally (A to B) its pressure is reduce

View Question A body weights 49N on a spring balance at the north pole. What will be its weight recorded on the same weighing machine,

View Question When a particle executes SHM, the nature of graphical representation of velocity as a function of displacement is :

View Question The period of oscillation of a simple pendulum is $$T = 2\pi \sqrt {{L \over g}} $$. Measured value of 'L' is 1.0 m from

View Question A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :

View Question Which of the following equations represents a travelling wave?

View Question Given below are two statements :Statement I : PN junction diodes can be used to function as transistor, simply by connec

View Question Two electrons each are fixed at a distance '2d'. A third charge proton placed at the midpoint is displaced slightly by a

View Question On the basis of kinetic theory of gases, the gas exerts pressure because its molecules :

View Question Match List - I with List - II.
List I
List II
(a)
Source of microwave frequency

View Question A circular hole of radius $$\left( {{a \over 2}} \right)$$ is cut out of a circular disc of radius 'a' as shown in figur

View Question Zener breakdown occurs in a p $$-$$ n junction having p and n both :

View Question The de-Broglie wavelength of a proton and $$\alpha$$-particle are equal. The ratio of their velocities is :

View Question According to Bohr atomic model, in which of the following transitions will the frequency be maximum?

View Question A uniform metallic wire is elongated by 0.04 m when subjected to a linear force F. The elongation, if its length and dia

View Question An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum

View Question A cylindrical wire of radius 0.5 mm and conductivity 5 $$\times$$ 107 S/m is subjected to an electric field of 10 mV/m.

View Question Two solids A and B of mass 1 kg and 2 kg respectively are moving with equal linear momentum. The ratio of their kinetic

View Question The root mean square speed of molecules of a given mass of a gas at 27$$^\circ$$C and 1 atmosphere pressure is 200 ms$$-

View Question A series L-C-R circuit is designed to resonate at an angular frequency $$\omega$$0 = 105 rad/s. The circuit draws 16W po

View Question A signal of 0.1 kW is transmitted in a cable. The attenuation of cable is $$-$$5 dB per km and cable length is 20 km. Th

View Question A point charge of +12$$\mu$$C is at a distance 6 cm vertically above the centre of a square of side 12 cm as shown in fi

View Question Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having fre

View Question A uniform thin bar of mass 6 kg and length 2.4 meter is bent to make an equilateral hexagon. The moment of inertia about

View Question