List of top Questions asked in WBJEE

Cholecystokinin stimulates the secretion of
Basic principle of developing transgenic plants and animals is to introduce the gene of interest into the nucleus of
An object placed in front of a concave mirror at a distance of $x \,cm$ from the pole gives a $3$ times magnified real image. If it is moved to a distance of $(x+5)\, cm$, the magnification of the image becomes $2$. The focal length of the mirror is
An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. $H_{2} SO_{2}$ and conc. $HNO_{3}.$ Indicate the correct statement from the following.
After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to
Animals are classified into hierarchical groups. In which one of the following, the largest number of species is found?
Homo erectus evolved during
The carcinoma, a type of cancer, originates from
In spermatogenesis, reduction division of chromosome occurs during conversion of
Which one of the following poultry birds is not an english breed?
The important gas which was absent during the formation of Earth is
The correct sequence of different phases of cell cycle is
Which one of the following life cycle stages of malarial parasite is responsible for relapse of malarial symptoms?
Which one of the following life cycle stages of Wuchereria bancrofti is infective to man?
A man having the genotype $EEFfGgHH$ can produce $P$ number of genetically different sperms, and a woman of genotype $liLLMmNn$ can generate $Q$ number of genetically different eggs. Determine the values of $P$ and $Q$.
The coordinates of the two points lying on $x + y = 4$ and at a unit distance from the straight line $4x + 3y = 10$ are
If the coordinates of one end of a diameter of the circle $x^2+y^2+4x-8y+5=0$, is (2,1), the coordinates of the other end is
The intercept on the line $y = x$ by the circle $x^2 + y^2 - 2x = 0$ is $AB$. Equation of the circle with $AB$ as diameter is
The $sp^3d^2$ hybridization of central atom of a molecule would lead to
The standard reduction potential $E^o$ for half reations are $Zn = Zn^{2+} + 2e^- ;\,\,E^o = +0.76 V$ $Fe = Fe^{2+} + 2e^-;\,\, E^o = + 0.41 V$ The EMF of hte cell reaction $Fe^{2+} + Zn = Zn^{2+} + Fe$ is
$20\, mL$ of $0.2\, M \,NaOH$ is added to $50\, mL$ of $0.2\, M$ acetic acid. The pH of this solution after mixing is $(Ka = 1.8 \times 10^{-5})$
The pH of an aqueous solution of $CH_3COONa$ of concentrated $C(M)$ is given by
The normality of $30$ volume $H_2O_2$ is
$2\,gm$ of metal carbonate is neutralized completely by $100 \,mL$ of $0.1 \,(N) \,HCl$. The equivalent weight of metal carbonate is
If the focal length of the eye-piece of a telescope is doubled, its magnifying power $(m)$ will be