In an alkaline medium,$H_2O_2$ exists as ........

The coefficient of $x^5$ in the expansion of $(1+x^2)^5(1+x)^4$ is:

The effect due to a uniform magnetic field on a freely suspended magnetic needle is as follows:

Velocity and acceleration vectors of a charged particle moving perpendicular to the direction of a magnetic field at a given instant of time are $\overrightarrow{v}=2 \hat{i}+c \hat{j}$ and $\overrightarrow{a}=3 \hat{i}+4 \hat{j}$ respectively. Then the value of $c$ is

The bonds present in ${N_2}{O_5}$ are ........

The maximum value of $\frac{\log x}{x}, 0 < x < \infty$ is