List of top Questions asked in WBJEE

The value of $\frac{2}{3!}+\frac{4}{5!}+\frac{6}{7!}+........$ is

$P_4O_{10}$ is the anhydride of

If $y'' - 3y' + 2y = 0$ where $y(0) = 1$, $y'(0) = 0$, then the value of $y$ at $x \,= log_e \,2$ is

Keto-enol tautomerism is not observed in

Half-life of a radioactive substance is $20$ minute. The time between $20\%$ and $80\%$ decay will be :

The decimal equivalent of the binary number $(11010.101)_2$ is

A ball is projected horizontally with a velocity of $5 \,m/s$ from the top of a building $19.6\, m$ high. How long will the ball take of hit the ground ?

Two solid spheres of same metal but of mass $M$ and $8\,M$ fall simultaneously on a viscous liquid and their terminal velocities are $v$ and $nv$, then value of $n$ is

In Young�s double slit experiment, the fringe width is $\beta$. If the entire arrangement is placed in a liquid of refractive index $n$, the fringe width becomes :

'Water-vascular' system is found in

The potential of a hydrogen electrode at $pH = 10$ is

Red cell count is carried out by

The reading of the ammeter in the following figure will be

For a reversible chemical reaction where the forward process is exothermic, which of the following statements is correct ?

In the reaction of sodium thiosulphate with $I_2$ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

The molarity of a $NaOH$ solution by dissolving $4 \,g$ of it in $250\, ml$ water is

Calculate $K_{C}$ for the reversible process given below if $K_{P}=167$ and $T=800^{\circ} C$ $CaCO _{3}( s ) \rightleftharpoons CaO ( s )+ CO _{2}( g )$

$0.1\, (M)\, HCl$ and $0.1\, (M)\, H_2SO_4$ each of volume $2ml$ are mixed and the volume is made up to $6\, ml$ by adding $2\,ml$ of $0.01\, (N)\, NaCl$ solution. The $pH$ of the resulting mixture is

At identical temperature and pressure, the rate of diffusion of hydrogen gas is $3\sqrt{3}$ times that of a hydrocarbon having molecular formula $C_{n}H_{2n-2}$. What is the value of $'n'$ ?

Tuberculosis is caused by

The term Alpha diversity refers to

�Organ of Jacobson� helps in

Most abundant mineral of animal body is

Mitochondria are semiautonomous as they possess

Which of the following thermodynamic relation is correct ?