Measuring Physical Quantities
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Questions and Answers

How can the volume of an irregularly shaped object be measured?

  • By using a ruler
  • By multiplying the length of its sides
  • By measuring its length, width, and height
  • By finding the change in the height of liquid in a measuring cylinder (correct)

    • What is the density of water?

  • 500 kg/m3
  • 1000 kg/m3 (correct)
  • 1500 kg/m3
  • 2000 kg/m3

    • Why does ice float on water?

  • Because it has a higher volume than water
  • Because it is less dense than water (correct)
  • Because it has a lower volume than water
  • Because it is denser than water

    • What is the formula for density?

    <p>p = m/v</p> Signup and view all the answers

    What is the precision of a digital clock?

    <p>To the nearest hundredth of a second</p> Signup and view all the answers

    Why does an object sink in water?

    <p>Because it is denser than water</p> Signup and view all the answers

    Study Notes

    Measuring Length

    • Length can be measured using a ruler.

    Measuring Time

    • The period of one oscillation can be measured by timing 20 oscillations and dividing by 20.

    Measuring Volume

    • The volume of a cube or cuboid is found by measuring the length of its three sides and multiplying them together.
    • The volume of a liquid can be measured using a measuring cylinder, where the bottom of the meniscus appears on the scale when viewed horizontally.

    Displacement and Density

    • All objects that sink in water displace their own volume of water.
    • The volume of an irregularly shaped object can be found from the change in the height of liquid in a measuring cylinder when it is immersed.
    • Density is the ratio of mass to volume for a substance: p = m/v.
    • The density of water is 1000 kg/m3 or 1.0 g/cm3.

    Buoyancy and Floating

    • Anything less dense than water will float in water, and anything denser than water will sink.
    • Ice floats because it is less dense than water.
    • One liquid will float on top of another liquid if it is less dense.

    Measuring Time Precisely

    • Time can be measured using a clock or watch.
    • Analogue clocks have hands and can only measure time to the nearest second.
    • Digital clocks display numbers and record time to a precision of at least one hundredth of a second.

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    Description

    This quiz covers measuring physical quantities such as length, period of oscillation, volume of solids and liquids, and displacement of objects in water.

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