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Significant Figures (Simplified) quiz

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  • What is the main difference between exact and inexact numbers?
    Exact numbers are obtained by counting or definition and have no uncertainty, while inexact numbers are measured and contain some uncertainty.
  • How many significant figures does an exact number have?
    Exact numbers have an infinite number of significant figures.
  • If a number has a decimal point, how do you count significant figures?
    Start from the left and begin counting at the first non-zero digit, counting every digit until the end.
  • If a number does not have a decimal point, how do you count significant figures?
    Start from the right and begin counting at the first non-zero digit, counting every digit until the end.
  • Why do inexact numbers have a specific number of significant figures?
    Because they are measured values and their precision depends on the measurement method.
  • What is an example of an exact number given in the lesson?
    The number of students in a lecture, such as 125 students, is an exact number.
  • What is an example of an inexact number from the lesson?
    A measured length like 12.53 inches is an inexact number.
  • How many significant figures are in the number 0.00234?
    There are 3 significant figures.
  • How many significant figures are in the number 5300 (with no decimal point)?
    There are 2 significant figures.
  • How do you handle significant figures in numbers written in scientific notation?
    Count the significant figures in the coefficient only; the exponent and base do not affect the count.
  • Why is it important to understand significant figures in scientific measurements?
    Because significant figures reflect the precision of measurements and help ensure accurate reporting of data.
  • What is the significance of trailing zeros in a number with a decimal point?
    Trailing zeros after a decimal point are counted as significant figures.
  • What is the significance of leading zeros in a number with a decimal point?
    Leading zeros before the first non-zero digit are not counted as significant figures.
  • How many significant figures does the number 1.20 × 10^3 have?
    It has 3 significant figures.
  • Why do exact numbers like '1 dozen = 12 eggs' have infinite significant figures?
    Because they are defined values with complete certainty and no measurement uncertainty.