CBSE 11 Physics · U1
Physical World and Measurements
CBSE Class 11 Physics Unit I: SI units, derived units, uncertainty, significant figures, dimensions, and dimensional analysis.
Test yourself
A focused, distraction-free run through 25 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 1.1
SI Units and Derived Quantities
Need for measurement, SI base units, derived units, and unit conversions in physical contexts.
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Topic 1.2
Uncertainty and Error in Measurement
Instrument least count, repeated readings, absolute error, percentage error, and uncertainty propagation for simple products and quotients.
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Topic 1.3
Significant Figures and Scientific Notation
Meaning of significant figures, rounding rules, and reporting calculated results to the correct precision.
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Topic 1.4
Dimensions of Physical Quantities
Dimensional formulae of common physical quantities and constants.
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Topic 1.5
Dimensional Analysis and Its Applications
Checking dimensional consistency, finding dimensions of constants, deriving proportional forms, and understanding limitations.
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