Hairs of a shaving brush cling together when it is removed from water due to:

In an $ac$ circuit $I = 100 \sin(200 \pi t)$. The time required for the current to achieve its peak value will be

Who was the first to discover dwarf wheat?

Which of the following compounds is an optically inactive compound?

$A$ particle of mass $2\, kg$ is initially at rest. $A$ force acts on it whose magnitude changes with time. The force-time graph is shown below. The velocity of the particle after $10\, s$ is ......... $ms^{-1}$.

The maximum value of $x^4 e^{-x^2}$ is