Which of the following would have the largest amount of mass?
1 nanogram (ng)
1 kilogram (kg)
1 milligram (mg)
1 centigram (cg)

1 kg

Explanation:

prefix nano means 10^-9

kilo 10^3

mili 10^-3

centi 10^-2

the largest amount is 1 kg

The correct answer is B. 1 kilogram (kg)

Explanation:

Mass refers to the amount of matter that can be found in an object or body, this property can be measured using different units such as grams, kilograms, decagrams, centigrams, etc. although each of this, measures different amounts of mass. In this way, the kilogram (kg) is the most common unit used for mass and the largest from the options presented, as a nanogram is equivalent to kilograms, a milligram is equivalent to kilograms and a centigram is equivalent to kilograms, which means all nanograms, milligrams, and centigrams are smaller units than kilograms.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current