Measurements & SI System

# Measurements & SI System Video Lecture | Physics Class 11 - NEET

## Physics Class 11

102 videos|411 docs|121 tests

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## FAQs on Measurements & SI System Video Lecture - Physics Class 11 - NEET

 1. What is the SI system and why is it important?
Ans. The SI system, also known as the International System of Units, is a standardized system of measurement used worldwide. It is important because it provides a common language for scientists, engineers, and other professionals to communicate and make accurate measurements. The system is based on seven base units, including the meter for length, the kilogram for mass, and the second for time.
 2. What is the difference between precision and accuracy in measurement?
Ans. Precision and accuracy are two important concepts in measurement. Precision refers to the degree of consistency or reproducibility in a set of measurements. Accuracy, on the other hand, refers to how close a measured value is to the true value. A measurement can be precise but not accurate if it consistently gives the same value but that value is far from the true value. A measurement can be accurate but not precise if it gives the true value but with a lot of variation.
 3. How do you convert between units in the SI system?
Ans. To convert between units in the SI system, you need to use conversion factors. A conversion factor is a ratio of two equivalent values expressed in different units. For example, to convert meters to centimeters, you would use the conversion factor 100 cm/1 m. To convert kilograms to grams, you would use the conversion factor 1000 g/1 kg. To convert between units of length, mass, time, temperature, and other quantities, you need to use the appropriate conversion factor.
 4. What is the significance of significant figures in measurement?
Ans. Significant figures, also known as significant digits, are the digits in a measurement that are meaningful and reliable. They are important because they indicate the precision of a measurement and help to avoid errors and misunderstandings. The number of significant figures in a measurement depends on the measuring instrument and the level of precision required. In general, significant figures are the digits from the first nonzero digit to the last digit of a measurement, including any zeros between them that are significant.
 5. How do you measure volume using the SI system?
Ans. Volume is a measure of the amount of space occupied by an object or substance. In the SI system, volume is measured in cubic meters (m³) or cubic centimeters (cm³). To measure the volume of a regular object, such as a cube or a cylinder, you can use a formula that relates the dimensions of the object to its volume. To measure the volume of an irregular object, such as a rock or a piece of wood, you can use the displacement method, which involves placing the object in a container of water and measuring the volume of water displaced.

## Physics Class 11

102 videos|411 docs|121 tests

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