Question

What is the SI unit of mass?
(a) Kg
(b) LBS
(c) Pounds
(d) None of these

Answer 1

Hint: The SI units are basically the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities.

Complete step by step answer:
1. Mass is a property of a physical body and it is also given as a measure of resistance to acceleration for a body when a net force is applied. In simple words, mass is essentially "how much stuff" is in an object. Kilogram is the SI unit of mass.
2. Now, LBS or the libra is an ancient Roman unit of mass that was equivalent to approximately 328.9 grams. It was divided into 12 ounces. "lb." is the symbol used for pound, having its origin from the word libra.
3. The pound or the pound mass is generally used in United States customary and other systems of measurements, it is legally defined as 0.453 kilograms, which is divided into 12 avoirdupois ounces.
4. Similarly, if we talk about weight:
Weight is referred to the force acting on an object due to gravity. It depends on the intensity of the gravity. Weight is measured in newtons. On Earth, an object with a mass of 1kg weighs 9.80665 newtons.

So, from the above statements we can conclude that (a) is the correct option.

Note: Many times, people misunderstand that the Gram is the SI unit of mass (because the prefix “kilo-” denotes multiplication by 1,000.) But the gram is part of the centimeter-gram-second (CGS) version of the metric system and is one of the Derived SI units, not as a base unit.