SI Units in the International System of Units

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Questions and Answers

In what year was the 14th General Conference on Weights and Measures held?

1971 (correct)

1980

1965

1975

What is the abbreviation of the International System of Units?

SI (correct)

ISU

What is the popular name of the International System of Units?

The Imperial System

The British System

The Metric System (correct)

The French System

How many physical quantities were chosen as basic quantities in the International System of Units?

Seven Signup and view all the answers

Where was the 14th General Conference on Weights and Measures held?

France Signup and view all the answers

What is the property that all bodies have?

Resistance to change in their motion Signup and view all the answers

What is mass a quantitative measure of?

Inertia or the resistance to a change in motion Signup and view all the answers

What is the term used to describe the resistance to a change in motion?

Inertia Signup and view all the answers

Which of the following is NOT a correct statement about mass?

Mass is a measure of velocity Signup and view all the answers

What determines the amount of resistance an object exhibits to a change in its motion?

Its mass Signup and view all the answers

What does SI stand for in the context of measurement systems?

International System Signup and view all the answers

Which of the following is the SI unit for force?

Newton Signup and view all the answers

Which base units are used to define the SI unit for force?

Mass, length, and time Signup and view all the answers

Which of the following is NOT a component of the International System of Units?

Imperial units Signup and view all the answers

What is the common name for the International System of Units?

Metric System Signup and view all the answers

What is the purpose of using prefixes in the International System of Units (SI)?

To make it easier to write very large or very small numbers. Signup and view all the answers

What is the SI prefix for 10^6?

mega Signup and view all the answers

What is the SI prefix for 10^-9?

nano Signup and view all the answers

What is the equivalent of 1.23 × 10^6 N in terms of SI prefixes?

1.23 MN Signup and view all the answers

What is the equivalent of 1.23 × 10^-9 s in terms of SI prefixes?

1.23 ns Signup and view all the answers

Which system of units is still used in the United States despite the widespread adoption of SI?

British engineering system Signup and view all the answers

Which of these is NOT a unit of force in the British engineering system?

newton (N) Signup and view all the answers

What is the main advantage of using SI prefixes?

All of the above. Signup and view all the answers

What is the SI unit for temperature?

Kelvin Signup and view all the answers

Which of the following best describes density?

The mass of an object per unit volume Signup and view all the answers

Which of the following is NOT a fundamental physical quantity?

Volume Signup and view all the answers

What is the definition of energy?

The ability to do work Signup and view all the answers

What are the fundamental physical quantities?

Mass, length, time, temperature, electric current, amount of substance, luminous intensity Signup and view all the answers

Study Notes

International System of Units (SI)

The International System of Units (SI) has seven fundamental physical quantities chosen as base units in 1971 at the 14th General Conference on Weights and Measures in France.
These quantities form the basis of the International System of Units, also known as the metric system.

Fundamental Physical Quantities

The seven fundamental physical quantities are listed in Table 1 with their unit names and symbols.

Derived Units

Many SI derived units are defined in terms of the first three quantities of Table 1.
Example: the SI unit for force, called the newton (N), is defined in terms of the base units of mass, length, and time.

Prefixes

SI uses prefixes to express large or small numbers in physics.
Each prefix represents a certain power of 10.
Examples of prefixes include mega (10^6) and nano (10^-9).

Expressing Magnitudes

Using prefixes, magnitudes can be expressed in a more concise way.
Example: 1.23 × 10^6 N = 1.23 mega newtons = 1.23 MN.
Example: 1.23 × 10^-9 s = 1.23 nano seconds = 1.23 ns.

Conventional Unit System

In addition to SI, another system of units, the British engineering system (or conventional system), is still used in the United States.

Physical Properties

Mass is a quantitative measure of inertia or the resistance to a change in motion.
All bodies have the property of resisting change in their motion.

Definitions

Density is defined as mass per unit volume.
Energy and mass are defined, but no specific definitions are provided in the text.

Questions

The SI unit for temperature is not specified in the text.
Questions 1-5 are listed, but the answers are not provided in the text.

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Description

Learn about the seven fundamental physical quantities chosen as the basis of the International System of Units, also known as the metric system.