The material given here includes the solved exercise of all chapters including MCQs and Short Question Answers and solved Numerical Problems. The Numerical Problems are solved with proper explanation and method. There are total of 9 chapter in 9th Class Physics book of PTB (Punjab Textbook Board).
9th Class Physics Chapter 1 Short Question Answers
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Correction and Comments about Numericals and Short Question Answers
- Short Question 1.8
Problem: Wrong answer given in notes.
Correct Answer:Â 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:Â 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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