List of top Questions asked in WBJEE

Nitrogenase enzyme is a
Third stage larva of Wuchereria bancrofti carried by Culex mosquito is called
The hormone that stimulates the release of pancreatic juice is
Wildlife Protection Act India was implemented in the year
Medullary rays are tissues made up of
A $20\,cm$ long capillary tube is dipped vertically in water and the liquid rises upto $10\, cm$. If the entire system is kept in a freely falling platform, the length of water column in the tube will be
A hollow sphere of external radius $R$ and thickness $t (<< R)$ is made of a metal of density $\rho$, sphere will float in water if
In the following compound, the number of ?sp? hybridized carbon is
A piece of wood from an' archaeological sample has $5.0$ counts $\min ^{-1}$ per gram of $C-14$, while a fresh sample of wood has a count of $15.0 \,min ^{-1} \,g ^{-1}$. If half-life of $C-14$ is $5770\, yr$, the age of the archaeological sample is
If $\sqrt{y}=cos^{-1}x,$ then it satisfies the differential equation $\left(1-x^{2}\right)-x \frac{dy}{dx}=c,$ where $c$ is equal to
Consider two concentric spherical metal shells of radii $r_1$ and $r_2 (r_2 > r_1)$. If the outer shell has a charge $q$ and the inner one is grounded, the charge on the inner shell is
A fair six-faced die is rolled $12$ times. The probability that each face turns up twice is equal to
The protein component of a holoenzyme is known as
The compressibility factor $(Z)$ of one mole of a van der Waals gas of negligible $�a�$ value is
$\left(_{32}Ge^{76}, _{34}Se^{76}\right)$ and $\left(_{14}Si^{30}, _{16}S^{32}\right)$ are examples of
The volume of ethyl alcohol (density $1.15\, g/cc$) that has to be added to prepare $100\,cc$ of $0.5\, M$ ethyl alcohol solution in water is
An infinite sheet carrying a uniform surface charge density o lies on the $x y$-plane. The work done to carry a charge $q$ from the point $A =a(\hat{ i }+2 \hat{ j }+3 \hat{ k })$ to the point $B =a(\hat{ i }-2 \hat{ j }+6 \hat{ k })$ (where $a$ is a constant with the dimension of length and $\varepsilon_{0}$ is the permittivity of free space) is
The order of decreasing ease of abstraction of Hydrogen atoms in the following molecule is
Let $X_{n}=\left\{z=x+i y:|z|^{2} \leq \frac{1}{n}\right\}$ for all integers $n \geq 1$. Then, $\overset{\infty}{\underset{n=1}{\cap}}$ is
The formal potential of $Fe ^{3+} / Fe ^{2+}$ in a sulphuric acid and phosphoric acid mixture $\left(E^{\circ}=+0.61 \,V \right)$ is much lower than the standard potential $\left(E^{\circ}=+0.77 \,V \right) .$ This is due to
Among the following statements about the molecules $X $ and $Y$, the one (s) which is (are) correct is (are)
The disease that occurs in mature adult human being due to deficiency of calciferol is
The structure of $XeF_6$ is experimentally determined to be distorted octahedron. Its structure according to VSEPR theory is
The $4^{th}$ higher homologue of ethane is
Let $n\ge2$ be an integer, $A=\begin{pmatrix}\cos\left(2\pi/ n\right)&\sin \left(2\pi / n\right)&0\\ -\sin\left(2\pi / n\right)&\cos\left(2\pi / n\right)&0\\ 0&0&1\end{pmatrix}$ and $?$ is the identity matrix of order $3$. Then