Question 1
What are the international units of mass and of weight, in that order?
The right answer is the one marked above.
Mass in kg; weight in N. Mass is the amount of matter contained in an object, and its unit is the kilogram.
Weight is the force pulling the object towards the earth. Being a force, its unit is the newton (N) — not the kilogram.
"My weight is 50 kilograms" is ordinary enough in everyday speech, but in physics it is incorrect. Fifty kilograms is a mass.