List of top Questions asked in WBJEE

For the reaction $A+2 B \longrightarrow C$, the reaction rate is doubled, if the concentration of $A$ is doubled. The rate is increased by four times when concentrations of both $A$ and $B$ are increased by four times. The order of the reaction is
Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are
Block $B$ lying on a table weighs $W$. The coefficient of static friction between the block and the table is $\mu$. Assume that the cord between $B$ and the knot is horizontal. The maximum weight of the block $A$ for which the system will be stationary is
Two copper spheres having same radii, one solid and other hollow, are charged to the same potential. Which of the following statements is correct?
Which one of the followings is a causative agent of plague?

Passage cells help in the

A metal wire of circular cross-section has a resistance $R_1$. The wire is now stretched without breaking so that its length is doubled and the density is assumed to remain the same. If the resistance of the wire now becomes $R_2$ then $R_2 : R_1$ is
Persons suffering from sickle cell anaemia normally suffer from
Match the flame colours of the alkaline earth metal salts in the Bunsen burner.
Nucleosome contains
Malacophily is the pollination by
Which one of the following combinations is ?
Which one of the following group of animals is homeothermic ?
What is the full form of MAB?
Two-membrane envelope is found in
The number of real solutions of the equation $(\sin x-x)\left(\cos x-x^{2}\right)=0$ is
TCA cycle enzymes are located in
Stock and scion are used in
Indicate the sequence during spermatogenesis.
Endosperm nucleus is
Egg in female gametophyte is accompanied by
Each 100 ml of human arterial blood carries �P� ml of $O_2$ and �Q� ml of $CO_2$ whereas each 100 ml of venous blood carries �R� ml of $O_2$ and �S� ml of $CO_2$. Choose the values of P, Q, R and S.
Nitrogenase enzyme is a
Melatonin is produced from
Third stage larva of Wuchereria bancrofti carried by Culex mosquito is called