Physics, Class XI Chapter: Physical World Topic: Physical world Classroom lecture by Pradeep Kshetrapal. Language : English mixed with Hindi.
Summary
Unit I: Physical World and Measurement (Periods 10)
Physics: Scope and excitement; nature of physical laws; Physics, technology and society.
Need for measurement: Units of measurement; systems of units; SI units, fundamental and derived
units. Length, mass and time measurements; accuracy and precision of measuring instruments; errors in
measurement; significant figures.
Dimensions of physical quantities, dimensional analysis and its applications
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