Fill in the blanks.
A physical quantity must be expressed with its number am A unit is a ............... . quantity.
(3) Mass is a .. quantity.
(4) Area is a .„ quantity.
(5) The British system is also called the ......•....... system.
(6) Length, mass and .. are called basic quantities.
(7) The unit of mass in CGS system is ................. .
(8) We use a ruler for. measuring .
(9) The SI unit of area is the .........„...... .
(10) The unit of length in is the foot.
(Il)The standard form of (he number 5068 is .... (12) Volume is quantity.
(13) The unit of time in all system of measurement is the
(14) The unit of mass in MKS system is .
(15j•The universe has the .............. . size.
(16) The unit slug is the unit of ....;......."... .
(17) The SI unit is the modified form of *'stem.
(18) A watch can be used to measure the .................
(19) The mass of a body is measured by a ..... ..
(20) One metre is equal to ........... .
(21) Elementary particles have the size.
(22) The earth can be regarded as a .
(23) The age of universe is .
