The magnifying power of a refracting type of astronomical telescope is $m$. If the focal length of the eyepiece is doubled,the magnifying power will become:

The complex $[Pt(py)(NH_3)(Br)(Cl)]$ will have how many geometrical isomers?

The famous botanical garden '$Kew$' is located in

Amongst $LiCl$,$RbCl$,$BeCl_{2}$,and $MgCl_{2}$,the compounds with the greatest and the least ionic character,respectively,are

$A$ magnetic needle lying parallel to a magnetic field is turned through $60^{\circ}$. The work done on it is $W$. The torque required to maintain the magnetic needle in the position mentioned above is

The sum of the fourth powers of the roots of the equation $x^3+x+1=0$ is