JEE Main 2020 (Online) 8th January Evening Slot
Paper was held on Wed, Jan 8, 2020 9:30 AM
View Questions

Chemistry

Among the reactions (a) - (d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron
View Question
An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation and also gives following reaction
View Question
Among the compounds A and B with molecular formula C9H18O3 , A is having higher boiling point the B. The possible struct
View Question
Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?
View Question
Consider the following plots of rate constant versus $${1 \over T}$$ for four different reactions. Which of the followin
View Question
The increasing order of the atomic radii of the following elements is :- (a) C (b) O (c) F (d) Cl (e) Br
View Question
For the following Assertion and Reason, the correct option is : Assertion : The pH of water increases with increase in t
View Question
Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?
View Question
The major product [B] in the following sequence of reactions is :-
View Question
A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passe
View Question
Arrange the following bonds according to their average bond energies in descending order : C–Cl, C–Br, C–F, C–I
View Question
Two monomers in maltose are :
View Question
Among (a) – (d) the complexes that can display geometrical isomerism are : (a) [Pt(NH3)3Cl]+ (b) [Pt(NH3)Cl5]– (c) [Pt(
View Question
The major product in the following reaction is:
View Question
White Phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound
View Question
The radius of the second Bohr orbit, in terms of the Bohr radius, a0, in Li2+ is :
View Question
Hydrogen has three isotopes (A), (B) and (C). If the number of neutron(s) in (A), (B) and (C) respectively, are (x), (y)
View Question
Preparation of Bakelite proceeds via reactions.
View Question
The correct order of the calculated spin-only magnetic moments of complexs (A) to (D) is: (A) Ni(CO)4 (B) [Ni(H2O)6]Cl2
View Question
For the following Assertion and Reason, the correct option is Assertion : For hydrogenation reactions, the catalytic act
View Question
For an electrochemical cell Sn(s) | Sn2+ (aq,1M)||Pb2+ (aq,1M)|Pb(s) the ratio $${{\left[ {S{n^{2 + }}} \right]} \over {
View Question
In the following sequence of reactions the maximum number of atoms present in molecule 'C' in one plane is _________. (
View Question
NaClO3 is used, even in spacecrafts, to produce O2. The daily consumption of pure O2 by a person is 492L at 1 atm, 300K.
View Question
At constant volume, 4 mol of an ideal gas when heated from 300 K to 500K changes its internal energy by 5000 J. The mola
View Question
Complexes (ML5) of metals Ni and Fe have ideal square pyramidal and trigonal bipyramidal grometries, respectively. The s
View Question

Mathematics

Let $$\overrightarrow a = \widehat i - 2\widehat j + \widehat k$$ and $$\overrightarrow b = \widehat i - \widehat j +
View Question
The area (in sq. units) of the region {(x,y) $$ \in $$ R2 : x2 $$ \le $$ y $$ \le $$ 3 – 2x}, is :
View Question
The length of the perpendicular from the origin, on the normal to the curve, x2 + 2xy – 3y2 = 0 at the point (2,2) is
View Question
If $$I = \int\limits_1^2 {{{dx} \over {\sqrt {2{x^3} - 9{x^2} + 12x + 4} }}} $$, then :
View Question
If a line, y = mx + c is a tangent to the circle, (x – 3)2 + y2 = 1 and it is perpendicular to a line L1, where L1 is th
View Question
Let S be the set of all functions ƒ : [0,1] $$ \to $$ R, which are continuous on [0,1] and differentiable on (0,1). Then
View Question
Which of the following statements is a tautology?
View Question
If the 10th term of an A.P. is $${1 \over {20}}$$ and its 20th term is $${1 \over {10}}$$, then the sum of its first 200
View Question
Let ƒ : (1, 3) $$ \to $$ R be a function defined by $$f(x) = {{x\left[ x \right]} \over {1 + {x^2}}}$$ , where [x] denot
View Question
The system of linear equations $$\lambda $$x + 2y + 2z = 5 2$$\lambda $$x + 3y + 5z = 8 4x + $$\lambda $$y + 6z = 10 has
View Question
If $$\alpha $$ and $$\beta $$ be the coefficients of x4 and x2 respectively in the expansion of $${\left( {x + \sqrt {{x
View Question
Let S be the set of all real roots of the equation, 3x(3x – 1) + 2 = |3x – 1| + |3x – 2|. Then S :
View Question
If a hyperbola passes through the point P(10, 16) and it has vertices at (± 6, 0), then the equation of the normal to it
View Question
Let A and B be two events such that the probability that exactly one of them occurs is $${2 \over 5}$$ and the probabili
View Question
The mirror image of the point (1, 2, 3) in a plane is $$\left( { - {7 \over 3}, - {4 \over 3}, - {1 \over 3}} \right)$$.
View Question
Let $$\alpha = {{ - 1 + i\sqrt 3 } \over 2}$$. If $$a = \left( {1 + \alpha } \right)\sum\limits_{k = 0}^{100} {{\alpha
View Question
If $${{\sqrt 2 \sin \alpha } \over {\sqrt {1 + \cos 2\alpha } }} = {1 \over 7}$$ and $$\sqrt {{{1 - \cos 2\beta } \over
View Question
The mean and variance of 20 observations are found to be 10 and 4, respectively. On rechecking, it was found that an obs
View Question
The differential equation of the family of curves, x2 = 4b(y + b), b $$ \in $$ R, is :
View Question
If $$A = \left( {\matrix{ 2 & 2 \cr 9 & 4 \cr } } \right)$$ and $$I = \left( {\matrix{ 1 & 0
View Question
$$\mathop {\lim }\limits_{x \to 0} {{\int_0^x {t\sin \left( {10t} \right)dt} } \over x}$$ is equal to
View Question
Let ƒ(x) be a polynomial of degree 3 such that ƒ(–1) = 10, ƒ(1) = –6, ƒ(x) has a critical point at x = –1 and ƒ'(x) has
View Question
Let a line y = mx (m > 0) intersect the parabola, y2 = x at a point P, other than the origin. Let the tangent to it a
View Question
The number of 4 letter words (with or without meaning) that can be formed from the eleven letters of the word 'EXAMINATI
View Question
The sum, $$\sum\limits_{n = 1}^7 {{{n\left( {n + 1} \right)\left( {2n + 1} \right)} \over 4}} $$ is equal to ________.
View Question

Physics

As shown in figure, when a spherical cavity (centered at O) of radius 1 is cut out of a uniform sphere of radius R (cent
View Question
In a double slit experiment, at a certain point on the screen the path difference between the two interfering waves is $
View Question
A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point i
View Question
A galvanometer having a coil resistance 100 $$\Omega $$ gives a full scale deflection when a current of 1 mA is passed t
View Question
A simple pendulum is being used to determine th value of gravitational acceleration g at a certain place. Th length of t
View Question
A particle of mass m and charge q is released from rest in a uniform electric field. If there is no other force on the p
View Question
Two liquids of densities $${\rho _1}$$ an $${\rho _2}$$ ($${\rho _2}$$ = 2$${\rho _1}$$) are filled up behind a square w
View Question
A transverse wave travels on a taut steel wire with a velocity of v when tension in it is 2.06 × 104 N. When the tension
View Question
A shown in the figure, a battery of emf $$\varepsilon $$ is connected to an inductor L and resistance R in series. The s
View Question
A capacitor is made of two square plates each of side 'a' making a very small angle $$\alpha $$ between them, as shown i
View Question
A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. A
View Question
A particle of mass m is dropped from a height h above the ground. At the same time another particle of the same mass is
View Question
A carnot engine having an efficiency of $${1 \over {10}}$$ is being used as a refrigerator. If the work done on the refr
View Question
Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. It
View Question
A uniform sphere of mass 500 g rolls without slipping on a plane horizontal surface with its centre moving at a speed of
View Question
An electron (mass m) with initial velocity $$\overrightarrow v = {v_0}\widehat i + {v_0}\widehat j$$ is in an electric
View Question
Consider two charged metallic spheres S1 and S2 of radii R1 and R2, respectively. The electric fields E1 (on S1) and E2
View Question
A particle moves such that its position vector $$\overrightarrow r \left( t \right) = \cos \omega t\widehat i + \sin \om
View Question
An object is gradually moving away from the focal point of a concave mirror along the axis of the mirror. The graphical
View Question
In the given circuit, value of Y is :
View Question
Three containers C1, C2 and C3 have water at different temperatures. The table below shows the final temperature T when
View Question
A ball is dropped from the top of a 100 m high tower on a planet. In the last $${1 \over 2}s$$ before hitting the ground
View Question
The first member of the Balmer series of hydrogen atom has a wavelength of 6561 Å. The wavelength of the second member o
View Question
An asteroid is moving directly towards the centre of the earth. When at a distance of 10R (R is the radius of the earth)
View Question
The series combination of two batteries, both of the same emf 10 V, but different internal resistance of 20$$\Omega $$ a
View Question
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12