Class 9 Physics – Chapter 1: Physical Quantities and Measurements - MCQs

📘 Multiple Choice Questions (Physical Quantities and Measurements)

Related Resources:

Full Chapter Notes Numerical Problems Important Definitions

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

Concept Description Measurement Instruments Understanding appropriate use of metre rule, Vernier calipers, micrometer screw gauge SI Units and Prefixes Knowledge of metric prefixes like femto-, nano-, kilo-, etc. Physical vs Non-Physical Quantities Differentiating measurable quantities from non-measurable attributes Measurement Techniques Proper use of measuring instruments and reading techniques Significant Figures Rules for determining significant figures in calculations Volume Measurement Methods for measuring volume of liquids and solids

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.

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