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SI units and prefixes Knowledge-Based Practice

Physics · Introduction to Physics · Physics · Measurement & Units

9 Physics practice questions on SI units and prefixes. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    Which of the following physical quantities is an SI base quantity rather than a derived quantity?

    • A) Luminous intensity
    • B) Electric charge
    • C) Frequency
    • D) Pressure
  2. 2.

    Which SI base unit is unique because its standard name and symbol inherently contain an SI prefix?

    • A) Kilogram
    • B) Ampere
    • C) Kelvin
    • D) Candela
  3. 3.

    Which of the following lists SI prefixes in order of increasing magnitude, from smallest to largest multiplying factor?

    • A) micro, pico, milli, mega
    • B) nano, micro, milli, kilo
    • C) pico, milli, micro, giga
    • D) nano, milli, micro, mega
  4. 4.

    How many micrometers (μm\mu\text{m}) are equivalent to 0.25 millimeters (mm)?

    • A) 25 μm\mu\text{m}
    • B) 250 μm\mu\text{m}
    • C) 2,500 μm\mu\text{m}
    • D) 0.00025 μm\mu\text{m}
  5. 5.

    What is the coherent derived unit of density in the International System of Units (SI)?

    • A) g/cm3\text{g/cm}^3
    • B) g/mL\text{g/mL}
    • C) kg/L\text{kg/L}
    • D) kg/m3\text{kg/m}^3
  6. 6.

    Which SI prefix corresponds to a multiplying factor of 10−1210^{-12}?

    • A) femto-
    • B) micro-
    • C) pico-
    • D) nano-
  7. 7.

    Which of the following correctly expresses the SI derived unit of energy, the joule (J), in terms of SI base units?

    • A) kg⋅m2⋅s−2\text{kg}\cdot\text{m}^2\cdot\text{s}^{-2}
    • B) kg⋅m⋅s−2\text{kg}\cdot\text{m}\cdot\text{s}^{-2}
    • C) kg⋅m2⋅s−3\text{kg}\cdot\text{m}^2\cdot\text{s}^{-3}
    • D) kg⋅m−1⋅s−2\text{kg}\cdot\text{m}^{-1}\cdot\text{s}^{-2}
  8. 8.

    Which of the following groups contains only SI base units?

    • A) Meter, newton, second, kelvin
    • B) Kilogram, second, ampere, mole
    • C) Joule, kilogram, candela, meter
    • D) Watt, second, ampere, kelvin
  9. 9.

    A laser emits light with a wavelength of 480 nanometers (nm). What is this wavelength expressed in meters in scientific notation?

    • A) 4.8×10−64.8 \times 10^{-6} m
    • B) 4.8×10−74.8 \times 10^{-7} m
    • C) 4.8×10−84.8 \times 10^{-8} m
    • D) 4.8×10−94.8 \times 10^{-9} m

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