Class 11 Physics Important Chapter 2 Units of Measurements Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 11 Physics Important Solutions and select need one. AHSEC Class 11 Physics Additional Notes English Medium Download PDF. HS 1st Year Physics Important Solutions in English.
Class 11 Physics Important Chapter 2 Units of Measurements
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. NCERT Class 11 Physics Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Physics Important Notes in English for All Chapters, You can practice these here.
Units of Measurements
Chapter: 2
| IMPORTANT QUESTION AND ANSWER |
Answer the Following Questions:
1. What is a physical quantity?
Ans: A property of a body or phenomenon that can be measured.
2. Define a unit.
Ans: A standard reference for measurement of a physical quantity.
3. What is a base quantity?
Ans: A fundamental physical quantity independent of others.
4. Name the seven base quantities in SI.
Ans: Length, mass, time, electric current, temperature, amount of substance, luminous intensity.
5. What is a derived unit?
Ans: Unit derived by combining base units.
6. Why is the SI system preferred?
Ans: It is universally accepted, decimal-based, and simple to use.
7. What are significant figures?
Ans: Digits that carry meaningful information about measurement precision.
8. How does scientific notation help in measurements?
Ans: It clearly shows significant figures and avoids confusion with zeros.
9. What are dimensions of a physical quantity?
Ans: Powers of base quantities representing the nature of the quantity.
10. What is dimensional formula?
Ans: An expression showing the dimensions of a quantity in terms of base quantities.
11. Explain the difference between fundamental and derived units.
Ans: Fundamental units measure base quantities like length, time, mass. Derived units are combinations of fundamental units, e.g., velocity = length/time.
12. Describe the significance of the SI unit of time (second).
Ans: Second is defined based on the frequency of the caesium-133 atom, making it highly precise and reproducible.
13. Why do we use significant figures in reporting measurements?
Ans: To indicate the precision and avoid giving a false sense of accuracy.
14. How do you perform multiplication/division with significant figures?
Ans: Result should have the same number of significant figures as the least precise value.
15. How do you perform addition/subtraction with significant figures?
Ans: Result should have as many decimal places as the least precise value.
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