List of top Questions asked in WBJEE JENPAS UG

The particles in the sol formed by addition of dilute aqueous solution of AgNO₃ to the excess dilute aqueous solution of KI are

For a first order reaction A→B if initial concentration of A is [A]₀, and the rate constant of the reaction is k, then concentration of the product ( x ) is related with time (t) as

Reaction of HNO₃ with P₂O_5, at lower temperature produces

The colour of the Ca-EDTA complex is

Which of the following structure is not meso-2,3-butanediol ?

Which of the following molecules is paramagnetic?

Correct order of stability of the following carbocations is-

Among the above components, the correct order of enol content is

The configuration of the reactant and the product in the above reaction, respectively, are

Arrange the following compounds in increasing order of acidity.

One mole of an ideal monoatomic gas is taken through the cycle ABCD as shown in the figure. If initial pressure, volume and temperature at point A are P_i, V_i, and T respectively, then choose the correct option (s).

An electric dipole consists of two charges -q and +q separated by a distance 2a. The dipole is along x-axis and its centre is at the origin. Then (considering k \(\frac{1}{4}πε_0\))

Let a variable load resistance of R be connected in series with a source of EMF E volt and internal resistance r 2 (see figure). V_AB represents the potential drop between A and B. Then

Two particles of masses my = 1 kg and m₂ = 2 kg are connected by a rigid rod of length L = 1.2 m and of negligible mass. The system rotates about an axis perpendicular to the rod and at a distance 'x' from the mass m₁, and the moment of inertia of the system is I. Then

Two media A and B are separated by a plane boundary surface. The speed of light in medium A and B are 2 x 10⁸ m/s and 2.5 x 10⁸ m/s respectively. The critical angle for which a ray of light going from A to B will have total internal reflection is A

A projectile is thrown with an initial velocity xî+yj from the ground. The range of the projectile is twice the maximum height of the projectile. The value of is \(\frac{ y}{x}\) is

An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with relative permittivity & = 4. Then 

A body initially at rest is moving with uniform acceleration 'a'. Its velocity after 'n' seconds is 'v'. The displacement of the body in last 2 seconds is

\(y(x,t)=\frac{0.8}{1+(x - 0.5t)^ 2}\) represents a moving pulse where x and y are in metre and t is in second. Then 

A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 3 : 1. The ratio of radii of the fragments is

A particle of mass m and charge Q is placed in an electric field E which varies with time t as E = E_o sin cot. The particle will undergo simple harmonic motion of amplitude

Consider a uniform sphere of radius R and mass M. A spherical cavity of radius R/2 is made in the sphere as shown in figure. The magnitude of the gravitational intensity at a point O on the surface of the cavity is

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe of length L. The length of the open pipe will be

As shown in the figure, a sector of 30° is removed from a circular disc of mass M and radius R. The moment of inertia of the remaining portion of disc about an axis passing through the centre and perpendicular to plane of disc is

A wire in the form of a semi-circle rotates about the diameter of the circle with angular frequency o in a uniform magnetic field perpendicular to the diameter of the circle. Then mean electrical power generated is