Gauss Law Questions

A charge $Q$ is enclosed by a Gaussian spherical surface of radius $R$. If the radius is doubled, then the outward electric flux will:

A hollow cylinder has a charge $q$ coulomb within it (at the geometrical centre). If $\varphi$ is the electric flux associated with the curved surface $B$, the flux linked with the plane surface $A$ is:

What is the flux through a cube of side ‘$a$ ’ if a point charge of $q$ is at one of its corners?