physical quantities (unit one )

which is a derived physical quantity

• mass

• volume

• electric current intensity

• amount of matter

gauss ( French ) system units is :

• g / cm / s

• feet / pound / s

• m / kg / s

• inch / ounce / s

the most accurate tool to measure length of a nail

• vernier caliper

• graduated meter

• ruler

• beam balance

the physical quantity which can not be defined by anther physical quantities :

• basic

• derived

• scaler

• vector

the quantity which can be measured :

• mathematical quantities

• chemical quantities

• physical quantities

• matter

the distance between two engrave on a rod of platinum - irradium alloy kept at 0 c

• standard kilogram

• standard second

• standard meter

• atomic meter

the second equals :

• 1/86400 of the moon day

• 1/8400 of the solar day

• 1/86400 of the day

• 1/86400 of the solar day

what is the older tool to measure the mass?

• beam balance

• digital balance

• sensitive balance

• Roman balance

the metric unit of solid angle ?

• meter

• degree

• stradian

• radian

which product has the smallest magnitude:

• pico. mega

• nano . kilo

• mili . nano

• mili . femto