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Joint Entrance Examination (JEE Main Paper 1)

Organized By: National Testing Agency (NTA)


Applicable For

Under Graduate

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Exam Date

Click Here

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1000 (INR)

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Maximum Marks


No of Questions


Exam Mode

English + 12

Paper Language

2 /Year

Conduct Frequency

National Entrance

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All About Units, Dimensions & Measurement - Download (JEE Mains)

What is Measurement ?

The act of measuring involves figuring out how much something weighs in physical terms. It involves comparing an unknown quantity to a standard unit. The result is recorded as a numerical value with a unit. Precision and accuracy are important considerations in measurement. It plays a crucial role in scientific investigation and validating theories.

What are Units ?

Units are standardized quantities used to express and compare physical measurements. They consist of a numerical value and a physical dimension. The International System of Units (SI) is the widely accepted system, defining base units like meter, kilogram, and second. Units ensure consistency and enable scientists to communicate and understand measurements worldwide. They play a vital role in establishing a common language for expressing physical quantities.

What are Dimensions ?

In physics, dimensions categorize the fundamental properties of physical quantities. They represent aspects like length, time, mass, temperature, and more. Dimensions are associated with base units and help maintain consistency in equations. Symbolic representations, such as [L] for length, are used in dimensional analysis. This analysis ensures the correctness and consistency of mathematical expressions.

Download PDF On Units, Dimensions & Measurement 

Download PDF

 Table of Content

1. Physical Quantity.

2. Types of Physical Quantity.

3. Fundamental and Derived Quantities.

4. Fundamental and Derived Units.

5. S.I. Prefixes.

6. Standards of Length, Mass and Time.

7. Practical Units.

8. Dimensions of a Physical Quantity.

9. Important Dimensions of Complete Physics.

10. Quantities Having Same Dimensions.

11. Application of Dimensional Analysis.

12. Limitations of Dimensional Analysis.

13. Significant Figures.

14. Rounding Off.

15. Significant Figures in Calculation.

16. Order of Magnitude.

17. Errors of Measurement.

18. Propagation of Errors

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