View and Download the solved questions, solved numerical problems or 9th Class Physics notes of Chapter 1 “Physical Quantities and Measurement” of Punjab Textbook Board. These 9th class physics notes of 1st Chapter are according to the new syllabus (2013) of Punjab Boards including Lahore Board, Gujranwala Board, Sahiwal Board, Rawalpindi Board, Faisalabad Board, Multan Board, Bahawalpur Board, Federal Board, DG Khan Board and Sargodha Board. Students of 9th Class of all these board can facilitate from the physics notes given below. You can also download  9th Class Physics Chapter 1 Solved Questions and Numericals Problems.

### Unit 1: Physical Quantities and Measurements

By studying this chapter students will be able to: Describe the crucial role of Physics in Science, Technology and Society. Explain with examples that Science is based on physical quantities which consist of numerical magnitude and a unit. Differentiate between base and derived physical quantities. list the seven units of System International (SI) alongwith their symbols and physical quantities (standard definitions of SI units are not required). Interconvert the prefixes and their symbols to indicate multiples and sub-multiples for both base and derived units. Write the answer in scientific notation in measurements and calculations. Describe the working of Vernier Callipers and screw gauge for measuring length. Identify and explain the limitations of measuring instruments such as metre rule, Vernier Callipers and screw gauge. Describe the need using significant figures for recording and stating results in the laboratory.

#### 9th Class Physics Chapter 1 Solved Numericals

• Short Question 1.8
Problem: Wrong answer given in notes.
Correct Answer:  It is the measurement or value that an instrument shows when it should be showing zero.
• Short Question 1.9
Problem: Wrong answer given in notes.
Correct Answer: By knowing the zero error, necessary correction can be made to find correct measurement. Otherwise our reading will be incorrect.
• Numerical 1.7
Problem : Wrong values of pitch of the screw guage(0.1mm) and number of division(100).
Correction:  The vale of pitch of the screw should be 0.5mm and number of divisions should be 50 according to the question. There is no change in answer, it remains the same.

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