Is weight a force?
Yes.
Yes.
The standard kilogram is the mass of a block of a platinum alloy kept at the international bureau of weights and measures near Paris in France.
Because the value of acceleration due to gravity (g) on the moon's surface is nearly 1/6th to that the surface of the earth.
Yes, fluids have weight.
It will remain the same on the moon, i.e., 9.8 kg.
A small value of G indicates that the force of gravitational attraction between two ordinary size objects is a very weak force.
Gravitation is the force of attraction between any two bodies while gravity refers to attraction between any body and the earth.