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Class 9 Chemistry · Chapter 12 · Test 1

SI Units

25 MCQs covering the importance of SI units in chemistry standardization of measurements five commonly used SI base units prefixes and symbols units of mass time temperature amount of substance and volume along with basic derived units.

MCQs

25 questions · 20 min · 25 marks

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Sample questions

The first 5 of 25. Try each one, then tap to see the answer.

  1. Question 1

    What does SI stand for?

    • ASystem International Units
    • BScientific International Units
    • CStandard Imperial Units
    • DSystematic International Measurements
    Show answer

    Answer: A

    System International Units is the standard system of units adopted by scientists worldwide.

  2. Question 2

    Why have scientists adopted SI units?

    • ATo make scientific communication easier worldwide
    • BTo eliminate all measurements
    • CTo replace experimentation
    • DTo avoid using numbers
    Show answer

    Answer: A

    Because SI units provide a common standard for sharing and comparing scientific measurements.

  3. Question 3

    What problem can arise when scientists use different units for the same quantity?

    • AMeasurements become difficult to compare
    • BMeasurements become automatically more accurate
    • CExperiments become unnecessary
    • DAll quantities become equal
    Show answer

    Answer: A

    Different units make comparison difficult and require additional conversions.

  4. Question 4

    How many base units are present in the SI system?

    • ASeven
    • BFive
    • CThree
    • DTen
    Show answer

    Answer: A

    The chapter states that there are seven base units in the SI system.

  5. Question 5

    How many base physical quantities are generally used in Chemistry according to the chapter?

    • AFive
    • BSeven
    • CThree
    • DTen
    Show answer

    Answer: A

    The five quantities are length time amount of substance mass and temperature.

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