Q4= The unit of mass in S.I. unit is?

a. kilogram
b. gram
c. tonne
d. quintal
e. newton

This was something you had to post a question on? Surely your text discussed the units.

then there's always google.

thanks a lot @bobpursley

thank u sir(°_^) for.... steve

The unit of mass in the International System of Units (SI) is the kilogram (kg). To get the answer to this question, you can refer to any reliable source that provides information about the SI unit system, such as textbooks, encyclopedias, or reputable websites. The SI system is a widely accepted and globally recognized system for measuring physical quantities. The kilogram is the base unit of mass in the SI system and is used to measure the mass of an object. It is defined as the mass of the International Prototype of the Kilogram, a platinum-iridium cylinder kept at the International Bureau of Weights and Measures (BIPM) in France.