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Notes ⇒ Class 11th ⇒ Physics ⇒ Units and Measurement

# Notes Units and Measurement - significant figures | Class 11 Physics - Toppers Study

Topper Study classes prepares CBSE Notes on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our CBSE Notes for Notes Units and Measurement - significant figures | Class 11 Physics - Toppers Study is the best material for English Medium students cbse board and other state boards students.

## Notes Units and Measurement - significant figures | Class 11 Physics - Toppers Study

CBSE board students who preparing for class 11 ncert solutions maths and Physics solved exercise chapter Units and Measurement available and this helps in upcoming exams 2023-2024.

### You can Find Physics solution Class 11 Chapter Units and Measurement

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Chapter 0 Physics class 11

### significant figures class 11 Physics Chapter Units and Measurement

• Notes Units And Measurement - Significant Figures | Class 11 Physics - Toppers Study
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• Chapter Units And Measurement Significant Figures Class 11

## Notes Units and Measurement - significant figures | Class 11 Physics - Toppers Study

### 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 précising 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 précising 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.

In result significant figure after decimal will be equal to minimum significant figures in any quantity that is added.

Example :

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Mathematics Class - 11th

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## Study Materials List:

##### Notes ⇒ Class 11th ⇒ Physics
Physical world
Units and Measurement
Motion In A Straight Line
Motion In A Plane
Law of Motion
Work Energy and Power
Systems of Particles and Rotational Motion

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