Most Important Units and Measurements Questions for 2025-26 Exams
Units and Measurements is the foundational chapter of JEE Physics, introducing you to the precise language of science and the system of units essential for problem-solving. This chapter covers SI units, dimensional analysis, error analysis, and measurement techniques—core skills that repeatedly appear in both JEE Main and Advanced. Take this mock test to sharpen your core fundamentals and improve your confidence in solving measurement-based problems accurately!
Mock Test Instructions for the Units and Measurements:
- 20 questions from Units and Measurements
- Time limit: 20 minutes
- Single correct answer per question
- Correct answers appear in bold green after submission
How Mock Tests Boost Your Mastery in Units and Measurements for JEE Physics
- Identify and fix mistakes in unit conversions and dimensional analysis quickly.
- Practice application-based questions on error analysis for stronger fundamentals.
- Monitor your understanding of SI/base units versus derived units with regular quizzes.
- Get instant feedback on significant figures and accuracy, vital for JEE problem-solving.
- Boost your problem-solving speed in calculation-oriented measurement questions with timed practice.
Master Units, Dimensions & Measurement Techniques with JEE-Level Mock Tests
- Revise all SI units and dimensional formulae efficiently using topic-focused mock test questions.
- Target and improve your precision in reading scientific measurements with exam-style problems.
- Enhance your confidence in solving error propagation and significant figure questions.
- Develop accuracy by practicing real JEE-style errors and hypothetical situations in measurement.
- Utilize mock test performance to identify and eliminate weak conceptual areas in this core chapter.
Subject-Wise Excellence: JEE Main Mock Test Links
| S.No. | Subject-Specific JEE Main Online Mock Tests |
|---|---|
| 1 | Online FREE Mock Test for JEE Main Chemistry |
| 2 | Online FREE Mock Test for JEE Main Maths |
| 3 | Online FREE Mock Test for JEE Main Physics |
Important Study Materials Links for JEE Exams
FAQs on Units and Measurements Mock Test 2025-26: Free Practice for Students
1. What are units and dimensions in physics?
Units and dimensions are fundamental concepts in measurement. Units refer to the standard quantities used to specify measurements (like meter, kilogram, second). Dimensions describe the qualitative nature of a physical quantity, showing how it depends on basic quantities such as length, mass, and time (for example, velocity has the dimension LT-1).
2. What are the seven base units in the SI system?
The seven base units in the International System of Units (SI) are:
1. Meter (m) for length
2. Kilogram (kg) for mass
3. Second (s) for time
4. Ampere (A) for electric current
5. Kelvin (K) for temperature
6. Mole (mol) for amount of substance
7. Candela (cd) for luminous intensity
3. How do you convert between different units of measurement?
To convert one unit to another, use the appropriate conversion factor and multiply or divide the given value as required. For example, to convert 1 kilometer to meters, multiply by 1000 (1 km = 1000 m). Always check that the units cancel correctly during conversion to ensure your answer is accurate.
4. What is meant by the dimensional formula of a physical quantity?
The dimensional formula expresses a physical quantity in terms of the powers of the base quantities (mass [M], length [L], time [T], etc.). For example, the dimensional formula of force is ML1T-2.
5. How can dimensional analysis help in deriving formulas?
Dimensional analysis helps derive relationships and check the correctness of physical formulas. By ensuring the left and right sides of an equation have the same dimensions, you can confirm the equation is dimensionally consistent and sometimes even derive unknown relationships among physical quantities.
6. What are fundamental and derived units?
Fundamental units are basic, independent units like meter, kilogram, and second. Derived units are combinations of these fundamental units, such as newton (kg·m/s2) for force and joule (kg·m2/s2) for energy.
7. What is the need for standard units of measurement?
Standard units ensure consistency and accuracy in measurements across the world. Using uniform measurement systems allows scientists and engineers to communicate and compare results reliably.
8. What is the dimensional formula for energy?
The dimensional formula for energy (such as work) is ML2T-2. This is derived from the equation: Work = Force × Displacement.
9. How do you measure length using metric units?
To measure length using metric units, use instruments like a ruler, meter scale, or vernier caliper and express the length in meters (m), centimeters (cm), or millimeters (mm). Always align the object with the zero mark and avoid parallax errors for accuracy.
10. How do you find the dimensions of a physical quantity?
To find the dimensions of a physical quantity, express it in terms of the basic physical quantities (mass, length, time, etc.). For example, for velocity: Velocity = Distance / Time ⇒ Dimension = [L][T]-1.
11. What is the importance of units and measurement in science?
Accurate units and measurement are crucial in science for reliable experimental results, reproducibility, and global collaboration. Standardized measurements are the foundation for comparing data and conducting research.
12. How can you check if a formula is dimensionally correct?
A formula is dimensionally correct if the dimensions on both sides of the equation are the same. Write the dimensional formula for every term and ensure both sides match exactly.
