Units and Measurement - Class 11 Physics English CBSE Notes
CBSE Notes for Class 11 are one of the most useful study resources for students who want to understand every chapter clearly and perform well in school examinations. At ATP Education, we provide carefully prepared chapter-wise CBSE Notes for Class 11 based on the latest CBSE syllabus and NCERT curriculum. These notes are designed to simplify learning, improve conceptual understanding, and help students revise important topics quickly before examinations.
CBSE Notes for Class 11 – Chapter-wise Revision Notes
Every chapter is explained in a simple and student-friendly manner so that learners can understand difficult concepts without confusion. Whether you are preparing for class tests, periodic assessments, half-yearly examinations, annual examinations, or board-oriented assessments, our Class 11 CBSE Notes help you revise the complete syllabus in less time while covering all the important concepts.
Units and Measurement - Class 11 Physics English CBSE Notes
Units and Measurement
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Units and Measurement
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Units and Measurement
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Units and Measurement
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Units and Measurement
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Units and Measurement
Units and Measurement
Significant Figures
Rule for counting significant numbers
(2) In a whole number the zeros on the right side of the given number are non-significant.
45400 [significant number is 3]
(3) All the zeroes between two non –zeroes digit are significant.
Example: 21001 [significant number is 5]
200.0 --- significant number 3
(3) if the number is less than one the zero on right side of the decimal and to the left of non-zero digit are not significant.
0.00102 [significant number is 3]
0.000007 [significant number is 1]
2.00007 [significant number is 6]
Special rule
0.7 [significant number is 1]
0.70 [significant number is 2]
0.700 [significant number is 3]
Changing in unitary:
0.00003 = 3 × 10-5 [significant number is 1]
1.17 × 106 = [significant number is 3]
Accuracy indicates how close our measurement is to the true value.
Precision is measured by least count of the measuring instrument and it is indicated by number of significant figure in the value.
- Precising depends on significant number.
Example: if you have a wall clock having only hour and minutes hands and does not have second hand so it will not give pr?cising measure.
It is necessary that accuracy has precision no it is possible that if precise observation may not be accurate.
Rounding the numbers by significant numbers.
If digit to be dropped is 5 or 5 followed by zero then pr?cising digit will be increased by 1 and if it is odd. But there will be not changed if it will be even.
Actual Operation
Propagation of significant number in mathematical operation.
Addition and substraction
In result significant figure after decimal will be equal to minimum significant figures in any quantity that is added.
Example :
Units and Measurement
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Units and Measurement
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Why Choose CBSE Notes for Class 11?
Reading the complete textbook is essential for building knowledge, but revision notes help students organize that knowledge effectively. Our CBSE Revision Notes for Class 11 summarize every chapter by highlighting important concepts, definitions, keywords, formulas, examples, and important points that students should remember during examinations. This approach saves valuable study time and makes revision much easier.
Students often find it difficult to revise lengthy chapters before examinations. Our notes solve this problem by presenting important information in a structured format that is easy to understand and remember. Regular revision using these notes helps improve confidence and strengthens conceptual clarity.
Chapter-wise Study Material
Each chapter included in the CBSE Notes for Class 11 section is prepared according to the latest academic session. Every topic is explained in simple language while maintaining accuracy and completeness. Students can easily revise important concepts, learn key points, and strengthen their understanding of each chapter.
The notes are suitable for daily classroom learning, homework preparation, revision before examinations, and self-study. They also serve as an excellent companion to NCERT textbooks by presenting the most important information in an organized manner.
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Success in examinations depends on regular practice, conceptual understanding, and effective revision. Our Class 11 CBSE Notes are designed to help students study smarter instead of studying longer. By revising chapter-wise notes regularly, learners can improve their understanding, remember important concepts for a longer period, and write better answers during examinations.
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