📘 Multiple Choice Questions (Physical Quantities and Measurements)
Learn and understand the Multiple Choice Questions (MCQs) of Chapter 1 – Physical Quantities and Measurements from Class 9 Physics with clear explanations and answers. This page provides free downloadable MCQs covering measurement tools, SI units, scientific notation, and practical lab techniques according to the Punjab PECTA 2025 syllabus.
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MCQ Questions with Answers
1. The instrument that is most suitable for measuring the thickness of a few sheets of cardboard is:
A. metre rule
B. measuring tape
C. Vernier Callipers
D. micrometer screw gauge
Answer: D. micrometer screw gauge
Explanation: Micrometer screw gauge provides the highest precision (0.01 mm) needed for measuring small thicknesses like cardboard sheets.
2. One femtometre is equal to:
A. \( 10^{-9} \, m \)
B. \( 10^{-15} \, m \)
C. \( 10^{9} \, m \)
D. \( 10^{15} \, m^2 \)
Answer: B. \( 10^{-15} \, m \)
Explanation: Femto- is the SI prefix for \( 10^{-15} \), so one femtometre equals \( 10^{-15} \) meters.
3. A light year is a unit of:
A. light
B. time
C. distance
D. speed
Answer: C. distance
Explanation: A light year is the distance that light travels in one year, approximately \( 9.46 \times 10^{15} \) meters.
📝 Note: These MCQs are designed to test your understanding of key concepts in Physical Quantities and Measurements. Practice regularly to improve your problem-solving skills.
Key Concepts Covered in These MCQs
Study Tips for Physical Quantities and Measurements
1. Understand Measurement Instruments: Learn the working principles, least counts, and appropriate uses of different measuring instruments.
2. Master SI Units: Memorize the SI base units and common prefixes used in the metric system.
3. Practice Reading Scales: Regularly practice reading Vernier scales and micrometer scales to improve accuracy.
4. Learn Significant Figures Rules: Understand how to determine significant figures and apply rules in calculations.
5. Solve Numerical Problems: Practice a variety of numerical problems to strengthen your understanding of measurement concepts.
Created by Hira Science Academy | Aligned with PECTA 2025 Syllabus