मात्रक एवं मापन Class 11 Physics | सार्थक अंक - Significant Figures | Units and Measurements | Lec-3

Change of units does not change the number of significant figure in a measurement. Is it true ?

STATEMENT-1 The mass of an object is 132 kg. The number of significant figures in this measurement is 3 STATEMENT 2 The same mass when expressed in grams as 132000 g has six significant figures

The unit of measurement is mm. If the measure is 4.2 cm, then find the number of significant figures in he measurement.

Significant figures in the measured value of a physical quantity tell the number of digits in which we have confidence. Larger the number of significant figures obtained in a measurement, greater is the accuracy of measurement and vice-verse, In addition or subtraction, the number of decimal places in the result should equal the smallest number of decimal places in any term in the operation. In multiplication and division, the number of significant figures in the product or in the quotient is the same as the smallest number of significant figures in any of the factors. With the help of the comprehension given above, choose the most appropriate alternative for each of the following questions : Add 3.8 xx10^(-6) to 4.2 x10^(-5) with due regard to significant figures

The unit of measurement is litre. If the measure is 4.000 kilolitres, then find the number of significant figures in the measurement.

The unit of measurement is cm. If the measure is 5.00 metres, then find the number of significant figures in the measurement.

STATEMENT-1 Number of significant figures in 0.007 s one and that in 0.700 is true STATEMENT 2 : All zeros in a number are not significant STATEMENT 3: Length of a rod is measured 100 m .Number significant figures in this measurement 1

If mass of an object measured is 4.237 gm (four significant figure) and its volume is measured to be 2.51 (three siginificant figure) cm^(3) , then find its density is proper significant figures.

If we measure a length l=3.267 cm with the help of a screw gauge, then (a) What is maximum uncertainty or maximum possible error in l? (b)How many significant figures are there in the measured length ? (c) Which digits are absolutely correct and which is/are doubtful?

What is the area of a recantangel 12.34 cm wide and 1.23 cm long? Stargetey: The area of a rectangler is its length times its width. First, we must check that the width and length are expressed in the same units. Then we mutiply the length by the width. Finally, we follow rule 3 to find the correct number fo significant figures. The Units for the result are equal to the product of the units for the individual terms in the multiplication.