JEE Main 2020 (Online) 3rd September Morning Slot

Paper was held on
Thu, Sep 3, 2020 3:30 AM

## Chemistry

It is true that :

View Question If the boiling point of H2O is 373 K, the boiling point of H2S will be :

View Question The complex that can show optical activity is :

View Question Which one of the following compounds possesses the most acidic hydrogen?

View Question The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products?

View Question Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :

View Question An acidic buffer is obtained on mixing :

View Question The antifertility drug “Novestrol” can react with :

View Question Which of the following compounds produces an optically inactive compound on hydrogenation?

View Question Of the species, NO, NO+, NO2+ and NO-
, the one with minimum bond strength is :

View Question Glycerol is separated in soap industries by :

View Question Thermal power plants can lead to :

View Question An organic compound [A], molecular formula C10H20O2
was hydrolyzed with dilute sulphuric acid to
give a carboxylic acid

View Question The electronic spectrum of [Ti(H2O)6]3+ shows a single broad peak with a maximum at 20,300 cm-1
.
The crystal field stab

View Question Henry’s constant (in kbar) for four gases $$\alpha $$, $$\beta $$, $$\gamma $$ and $$\delta $$ in water at 298 K is give

View Question The atomic number of the element unnilennium is :

View Question The mechanism of SN1 reaction is given as :
A student writes general characteristics based
on the given mechanism as :

View Question Tyndall effect is observed when:

View Question In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies)
respectively are :

View Question Let CNaCl
and CBaSO4 be the conductances (in S) measured for saturated aqueous solutions of NaCl
and BaSO4, respectivel

View Question The mole fraction of glucose (C6H12O6
) in an aqueous binary solution is 0.1. The mass percentage of
water in it, to the

View Question The volume strength of 8.9 M H2O2
solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L
atm K-1 mol-1) (round

View Question The total number of monohalogenated organic
products in the following (including
stereoisomers) reaction is ______.

View Question An element with molar mass 2.7 $$ \times $$ 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm. If its
densit

View Question The photoelectric current from Na (Work function, w0
= 2.3 eV) is stopped by the output voltage of
the cell Pt(s) | H2

View Question ## Mathematics

A dice is thrown two times and the sum of the
scores appearing on the die is observed to be
a multiple of 4. Then the co

View Question The lines
$$\overrightarrow r = \left( {\widehat i - \widehat j} \right) + l\left( {2\widehat i + \widehat k} \right)$$

View Question The foot of the perpendicular drawn from the
point (4, 2, 3) to the line joining the points
(1, –2, 3) and (1, 1, 0) lie

View Question If the first term of an A.P. is 3 and the sum of
its first 25 terms is equal to the sum of its next
15 terms, then the c

View Question A hyperbola having the transverse axis of
length
$$\sqrt 2 $$ has the same foci as that of the ellipse
3x2 + 4y2 = 12, t

View Question The area (in sq. units) of the region
{ (x, y) : 0 $$ \le $$ y $$ \le $$ x2 + 1, 0 $$ \le $$ y $$ \le $$ x + 1,
$${1 \o

View Question Let P be a point on the parabola, y2
= 12x and
N be the foot of the perpendicular drawn from
P on the axis of the parab

View Question Consider the two sets :
A = {m $$ \in $$ R : both the roots of x2
– (m + 1)x + m + 4 = 0 are real}
and B = [–3, 5).
Wh

View Question $$\int\limits_{ - \pi }^\pi {\left| {\pi - \left| x \right|} \right|dx} $$ is equal to :

View Question For the frequency distribution :
Variate (x) : x1 x2 x3
.... &nbs

View Question If y2 + loge (cos2x) = y, $$x \in \left( { - {\pi \over 2},{\pi \over 2}} \right)$$, then :

View Question The function, f(x) = (3x – 7)x2/3, x $$ \in $$ R, is
increasing for all x lying in :

View Question The value of (2.1P0
– 3.2P1 + 4.3P2 .... up to
51th term) + (1! – 2! + 3! – ..... up to 51th term)
is equal to :

View Question If $$\Delta $$ = $$\left| {\matrix{
{x - 2} & {2x - 3} & {3x - 4} \cr
{2x - 3} & {3x - 4} & {4x

View Question If the number of integral terms in the expansion
of (31/2 + 51/8)n is exactly 33, then the least value
of n is :

View Question If $$\alpha $$ and $$\beta $$ are the roots of the equation
x2
+ px + 2 = 0 and $${1 \over \alpha }$$ and $${1 \over \b

View Question The solution curve of the differential equation,
(1 + e-x)(1 + y2)$${{dy} \over {dx}}$$ = y2,
which passes through
the p

View Question Let [t] denote the greatest integer
$$ \le $$ t. If for some
$$\lambda $$ $$ \in $$ R - {1, 0}, $$\mathop {\lim }\limits

View Question 2$$\pi $$ - $$\left( {{{\sin }^{ - 1}}{4 \over 5} + {{\sin }^{ - 1}}{5 \over {13}} + {{\sin }^{ - 1}}{{16} \over {65}}}

View Question The proposition p
$$ \to $$ ~ (p
$$ \wedge $$ ~q) is equivalent
to :

View Question Let A = $$\left[ {\matrix{
x & 1 \cr
1 & 0 \cr
} } \right]$$, x $$ \in $$ R and A4 = [aij].
If
a11 =

View Question The value of $${\left( {0.16} \right)^{{{\log }_{2.5}}\left( {{1 \over 3} + {1 \over {{3^2}}} + ....to\,\infty } \right)

View Question If $$\mathop {\lim }\limits_{x \to 0} \left\{ {{1 \over {{x^8}}}\left( {1 - \cos {{{x^2}} \over 2} - \cos {{{x^2}} \over

View Question The diameter of the circle, whose centre lies on
the line x + y = 2 in the first quadrant and which
touches both the lin

View Question If $${\left( {{{1 + i} \over {1 - i}}} \right)^{{m \over 2}}} = {\left( {{{1 + i} \over {1 - i}}} \right)^{{n \over 3}}}

View Question ## Physics

Using screw gauge of pitch 0.1 cm and
50 divisions on its circular scale, the thickness
of an object is measured. It sho

View Question Model a torch battery of length $$l$$ to be made up
of a thin cylindrical bar of radius ‘a’ and a
concentric thin cylind

View Question Moment of inertia of a cylinder of mass M,
length L and radius R about an axis passing
through its centre and perpendicu

View Question When the wavelength of radiation falling on a metal is changed from 500 nm to 200 nm, the
maximum kinetic energy of the

View Question The magnetic field of a plane electromagnetic wave is
$$\overrightarrow B = 3 \times {10^{ - 8}}\sin \left[ {200\pi \le

View Question A charged particle carrying charge 1 $$\mu $$C is moving with velocity $$\left( {2\widehat i + 3\widehat j + 4\widehat k

View Question A 750 Hz, 20 V (rms) source is connected to a
resistance of 100 $$\Omega $$, an inductance of 0.1803 H
and a capacitance

View Question In a radioactive material, fraction of active
material remaining after time t is 9/16. The
fraction that was remaining a

View Question Pressure inside two soap bubbles are 1.01 and 1.02 atmosphere, respectively. The ratio of their
volumes is :

View Question A balloon filled with helium (32oC and 1.7 atm.)
bursts. Immediately afterwards the expansion
of helium can be considere

View Question A satellite is moving in a low nearly circular orbit around the earth. Its radius is roughly equal to
that of the earth’

View Question In the circuit shown in the figure, the total charge is 750 $$\mu $$C and the voltage across capacitor C2
is
20 V. Then

View Question An elliptical loop having resistance R, of semi major axis a, and semi minor axis b is placed in
magnetic field as shown

View Question When a diode is forward biased, it has a
voltage drop of 0.5 V. The safe limit of current
through the diode is 10 mA. If

View Question A uniform thin rope of length 12 m and mass 6 kg hangs vertically from a rigid support and a block
of mass 2 kg is attac

View Question A block of mass m = 1 kg slides with velocity v = 6 m/s on a frictionless horizontal surface and
collides with a uniform

View Question In a Young’s double slit experiment, light of
500 nm is used to produce an interference
pattern. When the distance betwe

View Question Magnitude of magnetic field (in SI units) at the
centre of a hexagonal shape coil of side 10 cm,
50 turns and carrying c

View Question
Consider a gas of triatomic molecules. The
molecules are assumed to be triangular and
made of massless rigid rods whose

View Question A bakelite beaker has volume capacity of 500 cc at 30oC. When it is partially filled with Vm
volume
(at 30oC) of mercur

View Question A cricket ball of mass 0.15 kg is thrown
vertically up by a bowling machine so that it
rises to a maximum height of 20 m

View Question Two isolated conducting spheres S1 and S2 of
radius $${2 \over 3}R$$ and $${1 \over 3}R$$ have 12 $$\mu $$C and –3 $$\mu

View Question When a long glass capillary tube of radius
0.015 cm is dipped in a liquid, the liquid rises
to a height of 15 cm within

View Question An observer can see through a small hole on the side of a jar (radius 15 cm) at a point at height of
15 cm from the bott

View Question A person of 80 kg mass is standing on the rim
of a circular platform of mass 200 kg rotating
about its axis at 5 revolut

View Question