List of top Questions asked in OJEE

Application of a forward bias to a p-n junction
The figure shows graphs of pressure versus density for an ideal gas at two temperatures $T_1$ and $ T_2$, then
The resistance of a wire is 24$O$. lt is so stretched that the length becomes four times, then the new resistance of wire will be
When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is
Diabetes mellitus is caused due to the deficiency of
Three electric bulbs of $200\, W, 200 \,W$ and $400\, W$ are shown in figure. The resultant power of the combination is
Cyclopropane rearranges to form propene $ \, \, \, \, \, \, \, \triangle \, \, \longrightarrow \, \, CH_3 - CH = CH_2$ This follows first order kinetics. The rate constant is $2.714 \times 10^{-3} \, s^{-1}.$ The initial concentration of cyclopropane is $0.29\, M$. What will be the concentration of cyclopropane after $100 \,s$?
Pick the appropriate choice about collision theory of reaction rates. I. It explains the effect of temperature on rate of reaction. II. It assumes that the reactants must be in correct orientation to react. III. It says rate depends upon he frequency at which reactants collide. IV. The collisions having energy higher than the threshold value will give successful reactions The correct points are
The decomposition of $ \, \, \, \, \, N_2 O_5 (g) \longrightarrow \, NO_2 (g) + NO_3 (g)$ proceeds as a first order reaction with a half-life period of $30 \,s$ at a certain temperature. If the initial concentration $[N_2 O_5] = 0.4 \, M$, what is the rate constant of the reaction?
Phylogenetic system of classification is based on
Two charged spheres of radii $R_1 \, and \, R_2$ have equal surface charge density. The ratio of their potential is
One haemoglobin carries how many molecules of $O_2$?
True replication of DNA is possible due to
Most acidic amongst the following is
Which are the first organisms to colonize on a bare rock ?
Value of $1+cos56^{\circ}+cos58^{\circ}-cos66^{\circ}$ is
The largest herbarium in India is located in
In which stage of meiosis crossing over takes place ?
Hydra reproduces by budding. This is an example of
Fusion of male gamete with polar nuclei of embryo sac is known as
Energy and nutrients enter a community by
Digestion in Hydra takes the place within
Digestion is brought about by
Electronic configuration of $ Cu^{ 2 + } $ ion is
Find the organic acid produced from the 11bove reaction