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Unit conversions Knowledge-Based Practice

Physics · Introduction to Physics · Physics · Measurement & Units

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

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Questions

  1. 1.

    A timer records an elapsed time of 1.5 hours. What is this duration expressed in seconds (s)?

    • A) 90 s
    • B) 1500 s
    • C) 2400 s
    • D) 5400 s
  2. 2.

    A laboratory balance measures a powder sample with a mass of 320 mg. What is this mass expressed in kilograms (kg)?

    • A) 3.2×10−1 kg3.2 \times 10^{-1}\text{ kg}
    • B) 3.2×10−3 kg3.2 \times 10^{-3}\text{ kg}
    • C) 3.2×10−4 kg3.2 \times 10^{-4}\text{ kg}
    • D) 3.2×10−6 kg3.2 \times 10^{-6}\text{ kg}
  3. 3.

    A mechanical press exerts a pressure of 5.0 N/cm25.0\text{ N/cm}^2. What is this pressure expressed in pascals (Pa)?

    • A) 5.0×104 Pa5.0 \times 10^4\text{ Pa}
    • B) 5.0×102 Pa5.0 \times 10^2\text{ Pa}
    • C) 5.0×10−2 Pa5.0 \times 10^{-2}\text{ Pa}
    • D) 5.0×10−4 Pa5.0 \times 10^{-4}\text{ Pa}
  4. 4.

    An electric heater consumes 1.80 kilowatt-hours (kW·h) of energy. What is this energy expressed in joules (J)?

    • A) 1.80×103 J1.80 \times 10^3\text{ J}
    • B) 1.08×105 J1.08 \times 10^5\text{ J}
    • C) 3.60×106 J3.60 \times 10^6\text{ J}
    • D) 6.48×106 J6.48 \times 10^6\text{ J}
  5. 5.

    An X-ray beam has a wavelength of 0.040 nanometers (nm). What is this wavelength expressed in meters (m)?

    • A) 4.0×10−84.0 \times 10^{-8} m
    • B) 4.0×10−94.0 \times 10^{-9} m
    • C) 4.0×10−104.0 \times 10^{-10} m
    • D) 4.0×10−114.0 \times 10^{-11} m
  6. 6.

    A storage container has an internal volume of 0.065 m3^3. What is this volume expressed in liters (L)?

    • A) 65 L
    • B) 6.5 L
    • C) 650 L
    • D) 0.65 L
  7. 7.

    A flat plate has a surface area of 2.5 m22.5\text{ m}^2. What is this area expressed in cm2\text{cm}^2?

    • A) 250 cm2250\text{ cm}^2
    • B) 25,000 cm225{,}000\text{ cm}^2
    • C) 2,500 cm22{,}500\text{ cm}^2
    • D) 250,000 cm2250{,}000\text{ cm}^2
  8. 8.

    A car travels at a constant speed of 72 km/h. What is this speed expressed in m/s?

    • A) 2.0 m/s
    • B) 20 m/s
    • C) 72 m/s
    • D) 259.2 m/s
  9. 9.

    A metal sample has a density of 2.4 g/cm32.4\text{ g/cm}^3. What is this density expressed in kg/m3\text{kg/m}^3?

    • A) 0.0024 kg/m30.0024\text{ kg/m}^3
    • B) 24 kg/m324\text{ kg/m}^3
    • C) 240 kg/m3240\text{ kg/m}^3
    • D) 2400 kg/m32400\text{ kg/m}^3

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