List of top Questions asked in JEE Main


A small block starts slipping down from a point B on an inclined plane AB, which is making an angle \(\theta\) with the horizontal section BC is smooth and the remaining section CA is rough with a coefficient of friction \(\mu\). It is found that the block comes to rest as it reaches the bottom (point A) of the inclined plane. If BC = 2AC, the coefficient of friction is given by \(\mu = k\tan\theta\). The value of k is ________.
The increasing order of the following compounds towards HCN addition is :
The IUPAC name for the following compound is
Consider the following rections:

'x', 'y' and 'z' in these reactions are respectively.
The major aromatic product C in the following reaction sequence will be :
The figure that is not a direct manifestation of the quantum nature of atoms is :
The major product in the following reaction is :
In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound?
Which one of the following graphs is not correct for ideal gas?

d = Density, P = Pressure, T = Temperature
The number of chiral carbons present in the molecule given below is _____ .
An electron gun is placed inside a long solenoid of radius R on its axis. The solenoid has n turns/length and carries a current I. The electron gun shoots an electron along the radius of the solenoid with speed v. If the electron does not hit the surface of the solenoid, maximum possible value of v is (all symbols have their standard meaning) :
A uniformly thick wheel with moment of inertia \(I\) and radius \(R\) is free to rotate about its centre of mass (see fig). A massless string is wrapped over its rim and two blocks of masses \(m_1\) and \(m_2\) (\(m_1 \gt m_2\)) are attached to the ends of the string. The system is released from rest. The angular speed of the wheel when \(m_1\) descents by a distance \(h\) is :
The current \(i\) in the network is :
An electric field \(\overrightarrow{E} = 4x\,\hat{i} - (y^2 + 1)\hat{j}\) N/C passes through the box shown in figure. The flux of the electric field through surfaces ABCD and BCGF are marked as \(\phi_I\) and \(\phi_{II}\) respectively. The difference between \((\phi_I - \phi_{II})\) is (in Nm\(^2\)/C) _______.
In a meter bridge experiment S is a standard resistance. R is a resistance wire. It is found that balancing length is \(l\) = 25 cm. If R is replaced by a wire of half length and half diameter that of R of same material, then the balancing distance \(l'\) (in cm) will now be________.
The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both zener diodes are identical) _________.
Consider the following reactions,

The compound [P] is :
The decreasing order of basicity of the following amines is :
Which of the following reactions will not produce a racemic product?
In the figure shown below reactant A (represented by square) is in equilibrium with product B (represented by circle). The equilibrium constant is :
In the following reaction A is :
A mixture of gases \(\mathrm{O_2}\), \(\mathrm{H_2}\) and \(\mathrm{CO}\) are taken in a closed vessel containing charcoal. The graph that represents the correct behaviour of pressure with time is :
In the given circuit diagram, a wire is joining points B and D. The current in this wire is :
A charged particle of mass 'm' and charge 'q' moving under the influence of uniform electric field \(E\hat{i}\) and a uniform magnetic field \(B\hat{k}\) follows a trajectory from point P to Q as shown in figure. The velocities at P and Q are respectively, \(v\hat{i}\) and \(-2v\hat{j}\). Then which of the following statements (A, B, C, D) are the correct ? (Trajectory shown is schematic and not to scale) :

(A) \(E=\frac{3}{4}\left(\frac{mv^2}{qa}\right)\)
(B) Rate of work done by the electric field at P is \(\frac{3}{4}\left(\frac{mv^3}{a}\right)\)
(C) Rate of work done by both the fields at Q is zero
(D) The difference between the magnitude of angular momentum of the particle at P and Q is \(2mav\).
Which of the following is an equivalent cyclic process corresponding to the thermodynamic cyclic given in the figure ? where, \(1\to2\) is adiabatic.
(Graphs are schematic and are not to scale)