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)
  • MU
  • IU
  • 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?

    <p>Seven</p> Signup and view all the answers

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

    <p>France</p> Signup and view all the answers

    What is the property that all bodies have?

    <p>Resistance to change in their motion</p> Signup and view all the answers

    What is mass a quantitative measure of?

    <p>Inertia or the resistance to a change in motion</p> Signup and view all the answers

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

    <p>Inertia</p> Signup and view all the answers

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

    <p>Mass is a measure of velocity</p> Signup and view all the answers

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

    <p>Its mass</p> Signup and view all the answers

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

    <p>International System</p> Signup and view all the answers

    Which of the following is the SI unit for force?

    <p>Newton</p> Signup and view all the answers

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

    <p>Mass, length, and time</p> Signup and view all the answers

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

    <p>Imperial units</p> Signup and view all the answers

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

    <p>Metric System</p> Signup and view all the answers

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

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

    What is the SI prefix for 10^6?

    <p>mega</p> Signup and view all the answers

    What is the SI prefix for 10^-9?

    <p>nano</p> Signup and view all the answers

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

    <p>1.23 MN</p> Signup and view all the answers

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

    <p>1.23 ns</p> Signup and view all the answers

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

    <p>British engineering system</p> Signup and view all the answers

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

    <p>newton (N)</p> Signup and view all the answers

    What is the main advantage of using SI prefixes?

    <p>All of the above.</p> Signup and view all the answers

    What is the SI unit for temperature?

    <p>Kelvin</p> Signup and view all the answers

    Which of the following best describes density?

    <p>The mass of an object per unit volume</p> Signup and view all the answers

    Which of the following is NOT a fundamental physical quantity?

    <p>Volume</p> Signup and view all the answers

    What is the definition of energy?

    <p>The ability to do work</p> Signup and view all the answers

    What are the fundamental physical quantities?

    <p>Mass, length, time, temperature, electric current, amount of substance, luminous intensity</p> 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.

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