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What is the value of 1mg in kg ?
A) 106
B) 106
C) 103
D) 103

Answer
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Hint: mg is short form of milligram and 1mg=103gm also when we deals with the units in kg there we use the conversion factor as 1gm=103kg. Putting all these values and then simplifying we get the conversion of milligrams in kilograms.

Complete step by step answer:
We know that 1mg=103gm & 1gm=103kg.
Rearranging the equation we get with
1gm=103mg
1kg=1000gm
Converting it in scientific notation, we get.
1kg=103gm putting the value, 1gm=103mg
1kg=103×103mg
Simplifying the equation we get with
1kg=106mg
1mg=1106kg
Simplifying the equation we get with
1mg=106kg.101
Since 1mg=106kg.

Hence, option (B) is the correct answer.

Additional information:
Here this table is given to provide more information about the conversion of units.

SI PREFIX SI SYMBOLSI UNIT CONVERSION FACTORFACTOR (POWER)FACTORLANGUAGE
MegaM1 megametre =100000 metres106Million
KiloK1 kilometre = 1000 metre103Thousand
Hectoh1 hectometre = 100 metre102Hundred
Decada1 decametre = 10 metreTen
m1 metre = 1 metre100One
Decid1 decimetre=0.1 metres101Tenth
Centic1centimetre=0.01 metres102Hundredth
Milim1milimetre=0.001 metres103Thousandth
Microμ1 micrometre=0. 000 001 metres106Millionth
Nanon1 nanometre=0. 000 000 001 metres109Billionth
Picop1 picometre=0.000 000 000 001 metres1012Trillionth
Femtof1 femtometre=0.000 000 000 000 001 metres1015Quadrillionth
Attoa1 attometre=0.000 000 000 000 000 001 metres1018Quintillionth
Zeptoz1 zeptometre=0.000 000 000 000 000 000 001 metres1021sextillionth
Yoctoy1 yoctometre=0.000 000 000 000 000 000 000 001 metres1024septillionth


Note:
In physics, mathematics and chemistry also where we have to deal with the bigger quantity and also the smaller quantity as we are confronting in daily use, a conversion factor is used to convert a measured quantity to a different unit of measure without changing the relative amount.
Units behave just like numbers in products and quotients, they can be multiplied and divided.
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