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Physics

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  • What happens to the liquid in a thermometer when heated?
    It expands and rises
  • What happens to the liquid in a thermometer when heated?
    It expands and rises.
  • Which ruler is more precise?
    Marked in mm
  • Why do thermometers use mercury or alcohol instead of water?
    Because mercury and alcohol expand evenly and do not freeze/boil easily like water.
  • A book has a mass of 1.2 kg and a bag has a mass of 800 g. What is their total mass?
    2.0 kg
  • If one student measures 15.0 cm and another measures 15.2 cm, what does this show?
    Both are close (accurate), but small differences show the level of precision of the ruler or method.
  • Which sense often fools us when measuring temperature?
    Skin
  • A book has a mass of 1.2 kg and a bag has a mass of 800 g. Total mass = ?
    2.0 kg
  • Why is a thermometer more reliable than our skin?
    Because a thermometer gives a numerical, accurate reading.
  • If you estimate your desk is 100 cm long, but it is actually 120 cm, is your estimate accurate?
    No, it is not accurate.
  • Why is estimation less reliable than measurement?
    Measurement uses instruments
  • Why does a pencil look bent when placed in water?
    Because light bends (refracts) when it passes from water to air, making the pencil look bent.
  • Why does lukewarm water feel hot to one hand and cold to the other if they were first in hot and cold water?
    Because our senses compare previous conditions and can be fooled.
  • Why is a thermometer better than skin for measuring temperature?
    Thermometer gives numbers
  • If your desk is actually 120 cm but you guessed 100 cm, your estimate is:
    Not accurate
  • Give one example where our senses fool us in measurement.
    Feeling water as hot or cold with our skin (temperature feels different depending on conditions).
  • Why does a pencil look bent in water?
    Water bends light (refraction)
  • Why is estimation less reliable than measurement?
    Because estimation depends on guessing and human senses, while measurement uses accurate instruments.
  • Why is mercury/alcohol used in thermometers instead of water?
    They expand evenly and don’t freeze easily
  • Which tool is best to measure the time taken for an experiment?
    Stopwatch
  • Best tool to measure time in an experiment?
    Stopwatch
  • Which ruler gives more precise results: one marked in cm or one marked in mm?
    The ruler marked in mm, because it gives smaller divisions.
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