Question

1. the mass of 20 g in si unit is (a) 200 kg (b) 0.02 kg (c) 0.0002 kg (d) 2000 kg (e) none of the above

Explanation:

Step1: Recall unit - conversion factor

The conversion factor between grams (g) and kilograms (kg) is $1\ kg = 1000\ g$, or $1\ g=\frac{1}{1000}\ kg = 10^{- 3}\ kg$.

Step2: Convert 20 g to kg

To convert 20 g to kg, we multiply the mass in grams by the conversion factor. So, $m = 20\ g\times\frac{1\ kg}{1000\ g}$.
$m=20\times10^{-3}\ kg=0.02\ kg$.

Answer:

B. 0.02 kg