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Title: Class 9th Solved Exercise Chapter-1
Description: Punjab Text Board Lahore, Pakistan
Description: Punjab Text Board Lahore, Pakistan
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Physics 9
th
Solved Exercise
Chapter # 1
Physical Quantities and Measurement
Q
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Ans
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Example
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Example
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2 Pick out the base unit in following
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mole,ampere,meter,Kelvin,coloumb and watt
Ans
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3 Find the base quantity involved in each of the following derived quantities
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a) length and time
c) force
b) length
d) work
c) mass,length and time
d) mass,length and time
Q
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Ans
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5 What role SI unit played in the development of science?
Ans
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Their addition,multiplication and division is easy because these can written in term of multiples of ten
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6 What do you understand by the zero error of measuring instrument?
Ans
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7 Why the use of zero error is necessary in measuring instrument?
Ans
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Q
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Stop Watch; The instrument which is used to measure the time interval of an event
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1 second
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9 Why we need to measure extremely small interval of times?
Ans
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Q
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All the accurately known digit and first doubt full digit in an expression
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0027050 have 5 significant figures
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11 How is precision related to the significant figures in a measured quantity?
Ans
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The smaller the value of least
count the large is value of precision
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Title: Class 9th Solved Exercise Chapter-1
Description: Punjab Text Board Lahore, Pakistan
Description: Punjab Text Board Lahore, Pakistan