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Mindmap: Units and Measurements | Physics Class 11 - NEET

The document Mindmap: Units and Measurements | Physics Class 11 - NEET is a part of the NEET Course Physics Class 11.
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FAQs on Mindmap: Units and Measurements - Physics Class 11 - NEET

1. What are the SI units of measurement?
Ans. The SI units of measurement, also known as the International System of Units, are a globally recognized set of standards for measuring physical quantities. The SI units include the meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminous intensity.
2. How are units converted in the metric system?
Ans. Units are converted in the metric system by using prefixes to indicate the magnitude of the measurement. The most commonly used prefixes are kilo- (k), which represents a factor of 1000, centi- (c), which represents a factor of 1/100, and milli- (m), which represents a factor of 1/1000. For example, to convert 2.5 kilometers to meters, you would multiply by 1000 to get 2500 meters.
3. What is the difference between accuracy and precision in measurements?
Ans. Accuracy refers to how close a measurement is to the true or accepted value, while precision refers to how close multiple measurements are to each other. A measurement can be precise but not accurate if it consistently deviates from the true value by the same amount. On the other hand, a measurement can be accurate but not precise if it is consistently close to the true value but shows variability in repeated measurements.
4. How do you measure temperature in different units?
Ans. Temperature can be measured using different units, but the most commonly used units are Celsius (°C), Fahrenheit (°F), and Kelvin (K). The Celsius scale is based on the freezing and boiling points of water, with 0°C representing the freezing point and 100°C representing the boiling point at sea level. The Fahrenheit scale is commonly used in the United States and is based on the freezing and boiling points of water as well, with 32°F representing the freezing point and 212°F representing the boiling point at sea level. Kelvin is an absolute temperature scale where 0K represents absolute zero, the lowest possible temperature.
5. How do you convert between different temperature units?
Ans. To convert between different temperature units, you can use conversion formulas. To convert from Celsius to Fahrenheit, you can use the formula °F = (°C × 9/5) + 32. To convert from Fahrenheit to Celsius, you can use the formula °C = (°F - 32) × 5/9. To convert from Celsius to Kelvin, you simply add 273.15 to the Celsius temperature. To convert from Kelvin to Celsius, you subtract 273.15 from the Kelvin temperature.
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