List of top Questions asked in JEE Main

The oxide that gives H$_2$O$_2$ most readily on treatment with H$_2$O is :

Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :

Match List - I with List - II :
\[ \begin{array}{llcl} & \text{List - I} & & \text{List - II} \\ \text{(Parameter)} & & \text{(Unit)} \\ (a) & \text{Cell constant} & (i) & \text{S cm}^2 \text{ mol}^{-1} \\ (b) & \text{Molar conductivity} & (ii) & \text{Dimensionless} \\ (c) & \text{Conductivity} & (iii) & \text{m}^{-1} \\ (d) & \text{Degree of dissociation of electrolyte} & (iv) & \Omega^{-1} \text{m}^{-1} \\ \end{array} \]
Choose the most appropriate answer from the options given below :

Chalcogen group elements are :

In the reaction of hypobromite with amide, the carbonyl carbon is lost as :

At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol$^{-1}$) for hydrogen ($E_H$) and its isotope, deuterium ($E_D$), is best described by :

The correct sequence of correct reagents for the following transformation is :

Given below are two statements :
Statement I : Penicillin is a bacteriostatic type antibiotic.
Statement II : The general structure of Penicillin is :
Choose the correct option :

The major products A and B formed in the following reaction sequence are :

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl$_5$ is :

Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solids are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of temperatures.
(E) Amorphous solids have a definite heat of fusion.
Choose the most appropriate answer from the options given below :

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is:

Given below are two statements:
Statement I: $\alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II: At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

Which one of the following compounds will liberate $CO_2$ when treated with $NaHCO_3$?

Match List - I with List - II : List - I (Class of Drug)
(a) Antacid
(b) Artificial Sweetener
(c) Antifertility
(d) Tranquilizers List - II (Example)
(i) Novestrol
(ii) Cimetidine
(iii) Valium
(iv) Alitame

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :

Consider the above reaction, and choose the correct statement :

If the time period of a two meter long simple pendulum is 2 s, the acceleration due to gravity at the place where pendulum is executing S.H.M. is :

a block of mass m slides on the wooden wedge which in turn slides backward on the horizontal surface. The acceleration of the block with respect to the wedge is:
[ Given m= 8kg, M=16kg ]
[Assume all the surfaces shown in the figure to be frictionless]

A particle is projected with velocity $v_0$ along x-axis. A damping force is acting on the particle which is proportional to the square of the distance from the origin i.e. $ma = -ax^2$. The distance at which the particle stops :

If 'f' denotes the ratio of the number of nuclei decayed Nd to the number of nuclei at t=0 N0 then for a collection of radioactive nuclei, the rate of change of 'f' with respect to time is given as: [$\lambda$ is the radioactive decay constant]

A parallel-plate capacitor with plate area A has separation d between the plates. Two dielectric slabs of dielectric constant K$_1$ and K$_2$ of same area A/2 and thickness d/2 are inserted in the space between the plates. The capacitance of the capacitor will be given by:

Five identical cells each of internal resistance 1 $\Omega$ and emf 5 V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same ?

The truth table for the following logic circuit is:

Two discs have moments of inertia I$_1$ and I$_2$ about their respective axes perpendicular to the plane and passing through the centre. They are rotating with angular speeds, $\omega_1$ and $\omega_2$ respectively and are brought into contact face to face with their axes of rotation coaxial. The loss in kinetic energy of the system in the process is given by: