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**What is science? In how many branches the knowledge of science is divided? Define each branch of science****Enumerate and define main frontiers of fundamental science?****What is Physics, define? Also highlight the Areas that are dealt by Physics?****Write a note on the importance of Physics?****Write a note on Physical Quantities, explaining their categories and steps to measure?****Explain****International System of Units****Explain Scientific Notation and highlight the Convention for Indicating the Units?****Why Errors and uncertainties occur during measurement?****Briefly, describe the major****types****of errors?****What is meant by the Significant Figures of a measurement. What are the main points to be kept in mind while determining the significant figures of a measurement?****Briefly, describe rules for rounding off the data?****Describe the Einstein’s famous Mass Energy Equation?****Explain ‘the difference between Precision and accuracy with the****help of examples?**

**Measurements** ** – Learning Objectives **

At the end pf this chapter the students will be able to:

1.Understand what is Physics.

2. Understand that all physical quantities consist of a numerical magnitude and a unit.

3. Recall the following base quantities and their units; mass (kg), length (m), time (s), current (A), temperature (K), luminous intensity (cd) and “amount of substance (mol).

4. Describe and use base units, supplementary units, and derived units.

5. Understand and use the scientific notation.

6. Use the standard prefixes and their symbols to indicate decimal sub-multiples or multiples to both base and derived units.

7. Understand and use the conventions for indicating units.

8. Understand the distinction between systematic errors and random errors.

9. Understand and use the significant figures.

10. Understand the distinction between precision and accuracy.

11. Assess the uncertainty in a derived quantity by simple addition of actual, fractional or percentage uncertainties.

12. Quote answers with correct scientific notation, number of significant figures and units in all numerical and practical work.

13. Use dimensionality to check the homogeneity of physical equations.

14. Derive formulae in simple cases using dimensions.