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Practical Units - Units & Measurements, Physics Video Lecture - Class 11

FAQs on Practical Units - Units & Measurements, Physics Video Lecture - Class 11

1. What are practical units in the context of Units & Measurements in Physics?

Ans. Practical units in the context of Units & Measurements in Physics are the units of measurement that are widely used in everyday life and scientific experiments. These units are chosen based on their convenience and relevance to the specific measurement being made. Examples of practical units include the meter for length, kilogram for mass, and second for time.

2. Why are practical units important in physics?

Ans. Practical units are important in physics as they provide a standardized way to measure physical quantities. By using practical units, scientists and researchers can communicate measurements effectively and compare experimental results. These units also allow for easy conversion between different systems of measurement, facilitating international collaboration in scientific research.

3. How are practical units different from fundamental units in physics?

Ans. Practical units and fundamental units in physics differ in their nature and definition. Fundamental units are the basic units of measurement derived from fundamental physical quantities, such as length, mass, and time. They are independent and cannot be derived from any other unit. On the other hand, practical units are derived from fundamental units and are chosen based on convenience and common usage.

4. Can practical units change over time?

Ans. Yes, practical units can change over time as scientific understanding and technology advance. For example, the definition of the meter has evolved from being based on a physical prototype to being based on the speed of light in a vacuum. Similarly, the kilogram was redefined in 2019 based on fundamental constants rather than a physical object. These changes ensure that the practical units remain accurate and consistent with the latest scientific knowledge.

5. How can one convert between practical units and fundamental units?

Ans. To convert between practical units and fundamental units, one needs to know the conversion factors. These conversion factors can be obtained from the definitions of the practical units in terms of fundamental units. For example, to convert meters to feet, one can use the conversion factor of 1 meter = 3.281 feet. By multiplying or dividing the given quantity by the appropriate conversion factor, the conversion between practical and fundamental units can be achieved.

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Oct 02, 2025 Last updated

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