Questions and Answers
What is the correct conversion for 8 meters to millimeters?
How many seconds are there in a day?
What is the SI unit for measuring temperature?
Which of the following is equivalent to 1 kilometer?
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If you convert 5500 meters to kilometers, what is the result?
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Which of the following conversions is correct?
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What is the relationship between centimeters and millimeters?
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If a time interval is given as 3 weeks, how many days does it cover?
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What measuring device is specifically used for temperature?
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If a task takes 1.5 hours, how many seconds is that equivalent to?
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Study Notes
Measurement Overview
- Measurement determines the magnitude of a quantity against an agreed standard.
- Indigenous and modern methods exist for measurement practices.
Indigenous Methods of Measurement
- Practices have been localized and passed through generations.
- Focuses on measuring length, mass, and time.
Length Measurement
- Length measures the distance between two points.
- Indigenous units of length in Ethiopia include:
- Hand-span: Distance from the tip of the little finger to the thumb tip.
- Digit: Width of an adult fingertip.
- Cubit: Distance from elbow tip to middle finger tip when extended.
- Foot: Distance from heel to big toe tip.
- Pace: Distance of one normal walking step.
- Arm Span: Distance from fingertip of one hand to the other when arms are stretched.
Mass Measurement
- Local mass measurement tools include:
- Quntal: Equivalent to 100 kilograms, used for grains.
- Feresula: Measures pepper and coffee, equivalent to 17 kilograms.
Time Measurement
- Time is the measure of an interval's duration.
- Indigenous method uses the shadow of a tree to tell time based on the Sun's position.
- Historical time measuring devices:
- Sundial, Sand Clock, and Water Clock.
Volume Measurement
- Volume measures the space an object occupies.
- Common tools in Addis Ababa markets for measuring volume:
- Jog: Plastic cup for liquids.
- Tassa: Can for cereals and liquids.
- Sini: Ceramic cup for coffee and spices.
- Birchiko: Glass for measuring various items.
SI Units and Conversions
-
Length: SI unit is meter (m).
- Conversions:
- 1 km = 1000 m
- 1 m = 100 cm
- 1 cm = 10 mm
- Conversions:
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Time: SI unit is second (s).
- Time conversions:
- 1 hour = 60 minutes = 3600 seconds
- 1 day = 24 hours
- 1 week = 7 days
- 1 year = 365 or 366 days
- Time conversions:
Temperature Measurement
- Devices used: Thermometers (analog or digital).
- SI unit of temperature is Kelvin; other units include °C and °F.
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Description
Explore the concepts of measurement in this quiz designed for Grade 8 General Science. It covers both indigenous and modern methods of measurement, providing insights into how measurements are made and their significance in obtaining the magnitude of quantities. Test your understanding of measurement practices in science!
