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Quantities and Units - Engineering

Q1:

The number 0.0003 multiplied by 10-3 is

A 0.0000003

B 0.0003

C 3

D 3,000

ANS:A - 0.0000003

0.0003*10^-3=0.0003*1/1000,
0.0003/1000=3*10^-7,
3*1/10000000=3/10000000,
3/10000000=0.0000003