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11th class physics chap1page 5 practical center

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PRACTICAL CENTER SIR JAWED IFTEKHAR 03332349202 2. OR All the digits in the measure quantity about which we are sure are called significant figures. OR In any measurement, the correctly known digits and the first doubtful digit are know as significant figures. RULES TO COUNT SIGNIFICANT FIGURES: 1. 3. 4. 5. 6. 7. 8. 9.A SIGNIFICANT FIGURES The number of digits which are reasonably reliable are called significant figures, XI-Physics Chapter# 1, Number of non-zero digits in a number are significant figures. e.g. In 15.2 significant figures. are 3. If zero is between two significant, figures it is counted as significant figure. e.g. In 203 significant figures are 3.`. Zero on the right of the significant figure are not counted. e.g. In 2100, significant figures are 2. Zero on left of the significant figures are not counted. e.g. In 0.002, significant figure is 1. Zero on right of a fractional number are counted. e.g. In 10.40, significant figures are four In addition, subtraction, multiplication and division, the number of significant figures of result is reduced to the smallest number of significant figures of the number in value in calculation. e.g. 3.142 x 2.7 = 8.4834 = 8.5 (rounded for low significant figures). When we multiply the numbers then the significant figures in answer will be equals to least number of significant figures. When we add or subtract the number then the number of decimal places in answer will IMPORTANT QUESTIONS PAGES ...
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