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SI units and prefixes

Physics • Measurement & Units • Knowledge-Based • 10 questions

SI units and prefixes Knowledge-Based Download PDF

Physics · Introduction to Physics · Physics · Measurement & Units

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

Questions

  1. 1.

    In the International System of Units (SI), physical quantities are categorized as either base quantities or derived quantities. Which of the following is an SI derived quantity?

    • A) Thermodynamic temperature
    • B) Electric current
    • C) Electric charge
    • D) Luminous intensity
  2. 2.

    According to the rules established by the International System of Units (SI), which of the following practices is strictly forbidden when using prefixes?

    • A) Attaching an SI prefix to a derived unit that possesses a special name
    • B) Applying an SI prefix that represents a negative power of ten
    • C) Using an SI prefix in combination with the SI base unit of time
    • D) Combining two or more prefixes consecutively before a single unit symbol
  3. 3.

    In the International System of Units (SI), the base unit of mass is the kilogram (kg), which already contains a prefix. Which of the following correctly describes how metric prefixes must be applied to express other multiples and submultiples of mass?

    • A) Prefixes are attached directly to the kilogram, forming compound units such as mkg\text{mkg} or μkg\mu\text{kg}.
    • B) Prefixes are not permitted for mass, requiring all mass values to be written strictly in scientific notation using the kilogram.
    • C) Prefixes must be attached to the metric tonne (t) instead of the gram or kilogram.
    • D) Prefixes are attached to the unit name 'gram' and its symbol g, rather than to the kilogram.
  4. 4.

    Which of the following lists of SI prefixes is arranged in order of decreasing magnitude?

    • A) mega-, giga-, centi-, micro-
    • B) giga-, mega-, milli-, micro-
    • C) micro-, milli-, kilo-, mega-
    • D) giga-, kilo-, nano-, milli-
  5. 5.

    What is the volume of 8.0 cm38.0\text{ cm}^3 expressed in cubic meters (m3\text{m}^3)?

    • A) 8.0×10−6 m38.0 \times 10^{-6}\text{ m}^3
    • B) 8.0×10−2 m38.0 \times 10^{-2}\text{ m}^3
    • C) 8.0×10−3 m38.0 \times 10^{-3}\text{ m}^3
    • D) 8.0×10−4 m38.0 \times 10^{-4}\text{ m}^3
  6. 6.

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

    • A) kg⋅m⋅s−1\text{kg}\cdot\text{m}\cdot\text{s}^{-1}
    • B) kg⋅m2⋅s−2\text{kg}\cdot\text{m}^{2}\cdot\text{s}^{-2}
    • C) kg⋅m⋅s−2\text{kg}\cdot\text{m}\cdot\text{s}^{-2}
    • D) kg⋅m2⋅s−3\text{kg}\cdot\text{m}^{2}\cdot\text{s}^{-3}
  7. 7.

    Which of the following pairs correctly matches an SI prefix with its multiplying factor?

    • A) Mega: 10910^{9}
    • B) Giga: 10910^{9}
    • C) Micro: 10−310^{-3}
    • D) Nano: 10−610^{-6}
  8. 8.

    How many micrometers (μm\mu\text{m}) are equivalent to 1 kilometer (km)?

    • A) 10310^{3}
    • B) 10610^{6}
    • C) 10910^{9}
    • D) 101210^{12}
  9. 9.

    Which of the following groups consists exclusively of SI base units?

    • A) Kilogram, newton, second, kelvin
    • B) Meter, joule, ampere, mole
    • C) Meter, kilogram, second, ampere
    • D) Second, candela, volt, kilogram
  10. 10.

    Which of the following measurements is equivalent to 2.5×10−42.5 \times 10^{-4} s?

    • A) 2.5 ns
    • B) 25 ms
    • C) 2.5 ps
    • D) 250 μs