A Level Physics Practice Exam

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What is the standard unit for measuring mass?

Pounds
Grams
Kilograms
Liters

The correct answer is: Kilograms

The standard unit for measuring mass in the International System of Units (SI) is the kilogram. This is the base unit for mass, and it is widely used in scientific contexts for precise measurements. One kilogram is defined as the mass of a specific platinum-iridium cylinder stored in France, which provides a consistent and reproducible standard for mass measurement. While grams are commonly used for smaller masses and are related to kilograms (1 kilogram = 1000 grams), the kilogram remains the primary unit acknowledged for standard mass measurement. Pounds, although used in some countries, are part of the imperial system and not the SI. Liters measure volume, not mass, making it unrelated in context to the question of measuring mass. Hence, kilogram is the correct and standard unit for measuring mass.