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Questions and Answers
Which of the following correctly defines mass?
If 1 kilometer equals 1000 meters, how many meters are in 3 kilometers?
What is the base unit of length in the metric system?
What is the correct abbreviation for liter to avoid confusion with the number 1?
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Which metric prefix represents one-millionth?
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In the metric system, how many grams are in 5 kilograms?
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When converting from decimeters to meters, how many decimeters are equivalent to 1 meter?
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Which of the following measures weight instead of mass?
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What is the symbol for the base unit of mass in the SI system?
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Which of the following base units measures luminous intensity?
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Which of the following prefixes indicates a factor of one millionth (10^-6)?
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In scientific applications, the metric system is advantageous because it:
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If an object has a mass of 2 kg, how many grams does it weigh?
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What is the base unit for measuring temperature in the SI system?
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Which SI base unit corresponds to the measurement of time?
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How many centimeters are there in 12 meters?
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What is the equivalent of 76 liters in deciliters?
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What is the SI unit for luminous intensity?
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How many ounces are in 4 tablespoons?
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What is the conversion factor from grams to kilograms?
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Which unit is used to measure electric current in the SI system?
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Study Notes
SI System and Base Units
- Seven base units form the foundation of the SI (International System of Units).
- Base units are dimensionally independent:
- Length: Meter (m)
- Mass: Kilogram (kg)
- Time: Second (s)
- Electric Current: Ampere (A)
- Temperature: Kelvin (K)
- Amount of Substance: Mole (mol)
- Luminous Intensity: Candela (cd)
The Metric System
- The metric system features a single base unit for each measurement type (length, mass, volume).
- Prefixes for metric units denote sizes relative to base units, enhancing clarity and consistency.
- Advantages of the metric system:
- Globally adopted by most countries.
- Uniform prefixes across different types of measurements.
- Based on powers of ten for easy calculations.
Key Base Units in the Metric System
- Length: Meter (m)
- Mass: Gram (g)
- Volume: Liter (L); use capital 'L' to avoid confusion with the digit '1'.
Metric Prefixes
- Mega- (M): 1,000,000
- Kilo- (k): 1,000
- Hecto- (h): 100
- Deka (D): 10
- Base Unit: 1
- Deci- (d): 0.1
- Centi- (c): 0.01
- Milli- (m): 0.001
- Micro- (mc/μ): 0.000001
- Nano- (n): 0.000000001
Important Distinctions
- Mass vs. Weight:
- Mass: Total quantity of matter in an object.
- Weight: Gravitational force acting on an object.
Unit Conversion Practice
- Common conversions involve changing units within the metric system, e.g., meters to kilometers, liters to milliliters.
- English system conversions focus on differing units, such as converting feet to inches or gallons to pints.
Significant Figures
- Understanding significant figures is crucial for precise scientific measurements, reflecting the accuracy of numbers.‘1
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