Podcast
Questions and Answers
Which of the following is a base quantity?
Which of the following is a base quantity?
- Length (correct)
- Volume
- Pressure
- Density
What is the SI unit for mass?
What is the SI unit for mass?
- Pound
- Newton
- Kilogram (correct)
- Gram
Which physical quantity cannot be derived from other base quantities?
Which physical quantity cannot be derived from other base quantities?
- Acceleration
- Density
- Velocity
- Time (correct)
What is the purpose of dimensional analysis?
What is the purpose of dimensional analysis?
The SI unit of length, the meter, was redefined based on:
The SI unit of length, the meter, was redefined based on:
Physical quantities can only be measured using a scale.
Physical quantities can only be measured using a scale.
The SI unit of mass, the kilogram, is defined as the mass of a specific platinum–iridium alloy cylinder kept at the International Bureau of Weights and Measures at Sèvres, France.
The SI unit of mass, the kilogram, is defined as the mass of a specific platinum–iridium alloy cylinder kept at the International Bureau of Weights and Measures at Sèvres, France.
The second is defined as 9 192 631 700 times the period of oscillation of radiation from the cesium atom.
The second is defined as 9 192 631 700 times the period of oscillation of radiation from the cesium atom.
Dimensional analysis is used to derive relationships between physical quantities.
Dimensional analysis is used to derive relationships between physical quantities.
The equation $s = vt + 0.5at^2$ is dimensionally consistent.
The equation $s = vt + 0.5at^2$ is dimensionally consistent.
Study Notes
Base Quantities and SI Units
- Mass is a base quantity.
- The SI unit for mass is the kilogram (kg).
- The kilogram is defined as the mass of a specific platinum–iridium alloy cylinder kept at the International Bureau of Weights and Measures at Sèvres, France.
Time
- The second is defined as 9,192,631,700 times the period of oscillation of radiation from the cesium atom.
Dimensional Analysis
- Dimensional analysis is used to derive relationships between physical quantities.
- It is also used to check the consistency of equations, such as $s = vt + 0.5at^2$, which is dimensionally consistent.
Measuring Physical Quantities
- Physical quantities can be measured using different scales.
Redefining the Meter
- The SI unit of length, the meter, was redefined based on new standards.
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Description
Test your knowledge of physical quantities, including base and derived quantities, systems of units, and standards of length. Explore the fundamental concepts in physics and measurement.
