Units and Dimensions Weightage in JEE Main 2025

Units and Dimensions Weightage in JEE Main 2025 - Units and Dimensions is a fundamental topic in Physics that forms the basis of understanding the physical quantities implicated in the exam. Though it might not have a direct, dedicated weighatge in JEE Main 2025 Physics exam, its concepts and applications are crucial for various other topics in Physics. As per the previous year's analysis, some of the topics considered important from Units and Dimensions are Mechanics, Electromagnetism, and Modern Physics. Units and Dimensions Weightage in JEE Main is expected to be 2 to 3% which is equivalent to 3 to 4 marks in the exam. Candidates are asked a total of 35 to 45 questions in all JEE Main shifts covering Units and Dimensions.

Latest Update : JEE Main session 2 registration has begun on the jeemain.nta.nic.in on February 1, 2025 and the last date to register will be February 24, 2025. Candidates can now register themselves and fill in the JEE Main 2025 application form . The candidates who have registered for the JEE Main session 1 and also want to appear for session 2 will have to apply a fresh application and register themselves on the official website. The JEE Main session 2 2025 will be conducted from April 1 - April 8, 2025.

Units and Dimensions Weightage in JEE Mains require candidates to review the correctness of equations using dimensional analysis, and unit conversions where questions might require converting units from one system to another, having a great understanding of the units enables candidates to identify errors in calculations.
To increase the spectrum of achieving 12/12 in this section, candidates need to carve a strong JEE Main 2025 Preparation Strategy . The concept of Units and Dimensions is incorporated into different JEE Mains Physics topics like Electromagnetism, Mechanics, and Modern Physics. In this article, we have discussed the Units and Dimensions Weightage in JEE Main 2025 .

Check Also: JEE Main Previous Year Question Paper

What is Units and Dimensions Weightage in JEE Main Physics?

Units and Dimensions is a fundamental concept in physics that deals with the measurement of physical quantities and the relationships between them. Some of the topics covered in this topic are -

• Mechanics: Work, Kinematics, Dynamics, Energy, Power, Momentum
• Electromagnetism: Electric Field, Electric Charge, Electric Potential, Electromagnetic Induction, Magnetic Field
• Modern Physics: Speed Of Light, Planck's Constant, Atomic Mass Unit.

Expected Units and Dimensions Weightage in JEE Main 2025

Candidates can check the expected Units and Dimensions Weightage in JEE Main 2025 Physics from the table below.

JEE Main Units & Dimension Subtopics Weightage

How Many Questions Are Asked from Units and Dimension? (Year Wise)

Candidates can check the weightage of the sub-topics asked from Units and Dimensions in JEE Mains previous years.

Units and Dimensions Sample Questions

1. Which among the following is the Supplementary Unit——–

1. Solid angle
2. Mass
3. Time
4. Luminosity

Answer: (a) Solid angle

Explanation: Supplementary units are plane angles and solid angles. Other units mentioned are base units.

2. The symbol to represent “Amount of Substance” is ________

1. K
2. Cd
3. A
4. mol

Answer: (d) mol

Explanation: The symbol to represent the Amount of Substance is mol.

3. What is the unit of solid angle?

1. Steradian
2. second
3. kilogram
4. candela

Answer: (a) Steradian

Explanation: Steradian is the unit of solid angle.

4. AU is the unit of ________

1. Astronomy Unit
2. Astrological Unit
3. Astronomical unit
4. Archaeological Unit

Answer: (c) Astronomical unit

Explanation: The astronomical unit is the average distance of the Sun from the Earth. It is represented by the symbol AU.

5. Dimensions of kinetic energy is the same as that of ________

1. Acceleration
2. Velocity
3. Work
4. Force

Answer: (c) Work

Explanation: Dimensions of kinetic energy and work are the same.

6. Joule second is the unit of

1. Force
2. Angular momentum
3. Energy
4. Power

Answer: (b) Angular momentum

Explanation: Angular momentum is also known as rotational momentum. The total angular momentum of a closed system remains constant.

7. Electron volt is a unit of

1. Luminosity
2. Frequency
3. Force
4. Energy

Answer: (d) Energy

Explanation: One of the units of energy is electron volt.

8. Farad is the unit of ________

1. Luminosity
2. Wavelength
3. Permittivity
4. Inertia

Answer: (c) Permittivity

Explanation: Permittivity is the unit of Farad.

9. What is the system of unit

1. SMS system
2. MKP system
3. FPS System
4. CJS System

Answer: (c) FPS System

Explanation: The FPS System is one of the systems of units. Foot, Pound, and Second (FPS system).

10. The smallest value which is measured using an instrument is known as ________

1. Absolute count
2. Least count
3. Round off value
4. Minimum count

Answer: (b) Least count

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