Measurement of Physical Quantities Flashcards
What are physical quantities?
The quantities which can be measured are called physical quantities & consists of a magnitude and unit.
Examples of physical quantities?
length mass time volume etc.
Why was there a need to introduce a standard unit adopted by the world?
people especially business communities and scientists from different countries faced problems of converting the units into one another. This problem was solved at a conference of scientists from all over the world held in Paris.
where was the SI unit introduced?
in 1960, the eleventh general conference of the International Committee on Weights and Measures recommended that all countries of the world should adopt a system of same kind of standard units. This conference recommended the use of the International System of units. It is abbreviated as SI.
what are prefixes?
prefixes are based on multiplying and dividing the units by powers of 10. The words or letters added before SI units such as milli centi and kilo are known as prefixes.
milli means
1000th part
centi means
100th part
kilo means
1000 times
how many seconds in a day?
86,400 seconds
what are measuring instruments?
Measuring instruments are used to measure various physical quantities such as length, mass, time, and volume.
a metre rule can measure the object of something correctly up to __________.
1 mm
one millimeter
why is a measuring cylinder called a graduated cylinder?
It has a scale in mL or cm3 along its length.
what capacities of measuring cylinders are available in the school laboratory?
from 5mL to 500mL
Flasks are used _________?
for making solutions.
In school laboratory flasks are available in the sizes _______________?
50 mL 100 mL 250 mL 500 mL and 1000 mL
