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Questions and Answers
Which of the following correctly defines mass?
Which of the following correctly defines mass?
If 1 kilometer equals 1000 meters, how many meters are in 3 kilometers?
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 base unit of length in the metric system?
What is the correct abbreviation for liter to avoid confusion with the number 1?
What is the correct abbreviation for liter to avoid confusion with the number 1?
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Which metric prefix represents one-millionth?
Which metric prefix represents one-millionth?
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In the metric system, how many grams are in 5 kilograms?
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?
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?
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?
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?
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)?
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:
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?
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?
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?
Which SI base unit corresponds to the measurement of time?
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How many centimeters are there in 12 meters?
How many centimeters are there in 12 meters?
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What is the equivalent of 76 liters in deciliters?
What is the equivalent of 76 liters in deciliters?
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What is the SI unit for luminous intensity?
What is the SI unit for luminous intensity?
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How many ounces are in 4 tablespoons?
How many ounces are in 4 tablespoons?
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What is the conversion factor from grams to kilograms?
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?
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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