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Q.

The prefix atto is used for the fraction 

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a

10−9

b

10−12

c

10−15

d

10−18

answer is D.

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Detailed Solution

The prefix 10-18 is atto

A unit prefix is a specifier or mnemonic that is added to units of measurement to indicate multiples or fractions of the units. Units of various sizes are routinely created using these prefixes. The prefixes of the metric system, such as kilo and milli, denote division by powers of ten.

The prefix 10-18 is atto. Its symbol is a. So the correct answer is (d).

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