If a force $F$ is applied on a body and it moves with a velocity $v$,the power will be

If $\alpha, \beta$ and $\gamma$ are the roots of the equation $x^3+p x^2+q x+r=0$,then the coefficient of $x$ in the cubic equation whose roots are $\alpha(\beta+\gamma), \beta(\gamma+\alpha)$ and $\gamma(\alpha+\beta)$ is

$A$ Van de Graaff generator has a spherical metal shell as an electrode which is at a potential $15 \times 10^6 \ V$. If the dielectric strength of the surrounding medium is $5 \times 10^7 \ V \ m^{-1}$,then the diameter of the shell is: (in $cm$)

Compared to blood,our lymph has:

Which one of the following is an isotonic pair of solutions?

The perimeter of a sector is a constant. If its area is to be maximum,the sectorial angle is: