JEE Main 2020 (Online) 3rd September Morning Slot
Paper was held on Thu, Sep 3, 2020 3:30 AM
View Questions

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
EXAM MAP
Joint Entrance Examination
JEE MainJEE AdvancedWB JEEBITSAT
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN