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Q.

The accuracy of measurement also lies in the way the result is expressed. The number of digits to which a value is to be expressed is one digit more than number of sure numbers. Rules do exist to deal with number of digits after an operation is carried out on the given values. The error can be minimised by many trials and using the correct methods and instruments.If the length and breadth are measured as 4.234 and 1.05 m, the area of the rectangle is The order of magnitude of 147 isThe number of significant figures can reduce in

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a

4.4457 m2

b

4.45 m2

c

4.446 m2

d

0.4446 m2

e

1

f

2

g

3

h

4

i

Addition

j

Subtraction

k

Multiplication

l

Division

answer is , , .

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Detailed Solution

A=lb=4.4457 m2=4.45 m2One should retain only three significant figures.For x to be order of magnitude, 0.5<14710x≤5 should be satisfied.To find say difference between 20.17 and 20.15, we get 0.02 (i.e., one significant figure only).
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The accuracy of measurement also lies in the way the result is expressed. The number of digits to which a value is to be expressed is one digit more than number of sure numbers. Rules do exist to deal with number of digits after an operation is carried out on the given values. The error can be minimised by many trials and using the correct methods and instruments.If the length and breadth are measured as 4.234 and 1.05 m, the area of the rectangle is The order of magnitude of 147 isThe number of significant figures can reduce in