If there were no gravity,which of the following will not be there for a fluid?

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?

The force required to move a body up a rough inclined plane is double the force required to prevent the body from sliding down the plane. If the angle of inclination of the plane is $60^{\circ}$,then the coefficient of friction is

Most suitable method of introducing alien $DNA$ into a plant cell is

$A$ ball at rest is dropped from a height of $12 ~m$. It loses $25 \%$ of its kinetic energy on striking the ground and bounces back to a height '$h$'. Then the value of '$h$' is: (in $~m$)

If $y$ is a function of $x$ and $\log(x+y)=2xy$,then the value of $y'(0)$ is