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Unit conversions

Physics • Measurement & Units • Knowledge-Based • 9 questions

Unit conversions Knowledge-Based Download PDF

Physics · Introduction to Physics · Physics · Measurement & Units

9 Physics practice questions on Unit conversions. Questions that assess core concepts and understanding.

Questions

  1. 1.

    A laboratory balance measures the mass of a crystalline sample as 45 milligrams (mg). What is this mass expressed in the SI base unit of kilograms (kg)?

    • A) 4.5×10−54.5 \times 10^{-5} kg
    • B) 4.5×10−24.5 \times 10^{-2} kg
    • C) 4.5×10−44.5 \times 10^{-4} kg
    • D) 4.5×10−84.5 \times 10^{-8} kg
  2. 2.

    A laser emits light with a wavelength of 450 nm450\text{ nm}. What is this wavelength expressed in meters (m\text{m})?

    • A) 4.5×10−7 m4.5 \times 10^{-7}\text{ m}
    • B) 4.5×10−9 m4.5 \times 10^{-9}\text{ m}
    • C) 4.5×10−6 m4.5 \times 10^{-6}\text{ m}
    • D) 4.5×10−11 m4.5 \times 10^{-11}\text{ m}
  3. 3.

    A laboratory cart accelerates along a track at a constant rate of 240 cm/s2240\text{ cm/s}^2. What is this acceleration expressed in m/s2\text{m/s}^2?

    • A) 2.4 m/s22.4\text{ m/s}^2
    • B) 0.24 m/s20.24\text{ m/s}^2
    • C) 24 m/s224\text{ m/s}^2
    • D) 24 000 m/s224\,000\text{ m/s}^2
  4. 4.

    An electrical appliance consumes 1.5 kilowatt-hours (kWh) of energy. What is this energy expressed in joules (J)?

    • A) 5,400,000 J
    • B) 90,000 J
    • C) 5,400 J
    • D) 1,500 J
  5. 5.

    A pressure gauge records a value of 4.5 N/cm24.5\text{ N/cm}^2. What is this pressure expressed in pascals (Pa\text{Pa})?

    • A) 4.5×104 Pa4.5 \times 10^4\text{ Pa}
    • B) 4.5×102 Pa4.5 \times 10^2\text{ Pa}
    • C) 4.5×10−2 Pa4.5 \times 10^{-2}\text{ Pa}
    • D) 4.5×10−4 Pa4.5 \times 10^{-4}\text{ Pa}
  6. 6.

    A graduated cylinder contains 250 mL of water. What is this volume expressed in cubic meters (m3\text{m}^3)?

    • A) 2.5×10−1 m32.5 \times 10^{-1}\text{ m}^3
    • B) 2.5×10−4 m32.5 \times 10^{-4}\text{ m}^3
    • C) 2.5×10−3 m32.5 \times 10^{-3}\text{ m}^3
    • D) 2.5×10−6 m32.5 \times 10^{-6}\text{ m}^3
  7. 7.

    A metal plate has a surface area of 800 cm2800\text{ cm}^2. What is this area expressed in m2\text{m}^2?

    • A) 0.8 m20.8\text{ m}^2
    • B) 0.08 m20.08\text{ m}^2
    • C) 8.0 m28.0\text{ m}^2
    • D) 0.008 m20.008\text{ m}^2
  8. 8.

    A vehicle travels along a straight highway at a constant speed of 72 km/h. What is this speed expressed in meters per second (m/s)?

    • A) 259.2 m/s
    • B) 72.0 m/s
    • C) 2.0 m/s
    • D) 20 m/s
  9. 9.

    A sample of aluminum has a density of 2.7 g/cm32.7\text{ g/cm}^3. What is this density expressed in the SI unit of kg/m3\text{kg/m}^3?

    • A) 0.0027 kg/m30.0027\text{ kg/m}^3
    • B) 27 kg/m327\text{ kg/m}^3
    • C) 2700 kg/m32700\text{ kg/m}^3
    • D) 27 000 kg/m327\,000\text{ kg/m}^3