Metric System Mastery

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Questions and Answers

Which of the following is the correct definition of a metre (m)?

  • One metre is the mass of a platinum-iridium cylinder kept at the National Bureau of Weights and Measurements, Paris.
  • One metre is that current which, when passed through two straight parallel conductors of infinite length and of negligible cross-section kept at a distance of 1 metre apart in the vacuum, produces between them a force equal to 2 x 10^-7 newton per metre length.
  • One metre is the time taken by the light of a specified wavelength emitted by a caesium-133 atom to execute 9192631770 vibrations.
  • One metre is the distance travelled by light in the vacuum during a time interval of (1/299792458) seconds. (correct)

Which of the following is the correct definition of a kilogram (kg)?

  • One kilogram is that current which, when passed through two straight parallel conductors of infinite length and of negligible cross-section kept at a distance of 1 metre apart in the vacuum, produces between them a force equal to 2 x 10^-7 newton per metre length.
  • One kilogram is the time taken by the light of a specified wavelength emitted by a caesium-133 atom to execute 9192631770 vibrations.
  • One kilogram is the mass of a platinum-iridium cylinder kept at the National Bureau of Weights and Measurements, Paris. (correct)
  • One kilogram is the distance travelled by light in the vacuum during a time interval of (1/299792458) seconds.

Which of the following is the correct definition of a second (s)?

  • One second is the time taken by the light of a specified wavelength emitted by a caesium-133 atom to execute 9192631770 vibrations. (correct)
  • One second is the mass of a platinum-iridium cylinder kept at the National Bureau of Weights and Measurements, Paris.
  • One second is the distance travelled by light in the vacuum during a time interval of (1/299792458) seconds.
  • One second is that current which, when passed through two straight parallel conductors of infinite length and of negligible cross-section kept at a distance of 1 metre apart in the vacuum, produces between them a force equal to 2 x 10^-7 newton per metre length.

Which of the following is the correct definition of an ampere (A)?

<p>One ampere is that current which, when passed through two straight parallel conductors of infinite length and of negligible cross-section kept at a distance of 1 metre apart in the vacuum, produces between them a force equal to 2 x 10^-7 newton per metre length. (B)</p> Signup and view all the answers

Which of the following is the correct definition of a kelvin (K)?

<p>One kelvin is the fraction 1/273.6 of the thermodynamic temperature of the triple point of water. (A)</p> Signup and view all the answers

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