Read the following statements. Place V or F. a) Magnitudes are properties that characterize bodies or natural phenomena, and that cannot be measured.

b) A student compares the length of the classroom with a fixed quantity of the same magnitude. And to the magnitude he assigns a number and a unit, it is said, that he is measuring.

c) A time of: 15 minutes, a length of: 2 meters and a mass of: 250 grams are vector quantities.

d) The fundamental quantities are: length, weight, time, intensity of electric current, temperature, light intensity and quantity of substance.