Exam (elaborations)
Units, Dimensions, and Errors
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Cheat sheet of Units, Dimensions, and Errors for JEE applicable for all physics students, handwritten from JEE 2020 topper
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UNIT S, DIMEN SICNS AND ERRORSAphysical quantityis a quanhby
guanhty that
hat can bemesuee
pimension oFof
a phgSica qya
quanhty is dehned ag the
pouex to cuhieh the funlaments?
n isHhen i c a l value
u is he sie of niE
Si¡nithcant figuseg
Dom-2eo digits ane signhank
tuO
2) AJl zeras bet twoDon -zexo digits SSE
3)AL he 2eras to the Jet oF fsst digi's arg nat
lsgni hcant ey
44F Hhe ha.'s l s than zeras oh he ight of£ he
dlecimal paint but to he leR Jef of the ÆYst
First no
Zero digit are not signiticant 20023o hag 4SE
s. The taiing 2eos Czemto the right af the daet non
ze digit 'in a ne. wth a deeimd point axe sighihiont
Lo!osB bas 4sF
expanenhil term does not afeet the na
n a nond. withaut cdeimal, 2eros to ha sghf
ght of
digit are not signikcant but whenthe same
--hh-2 e6
diit
aue is ncesde on the basis sf aual Kpeimens
, they become significnt
but Is6oO nA has 5S.£
1S600 hag 3s
unit ot mensement do esez nnot
Ihe change in tee
affet hie hoof SF
= 4.S.
ex 2308cm 230 mM: Q.230Pm
ROuNDINQ OEE
) f she digit ta be xourded off k more thun 5, ton
the precding digt is incrased by one
Jet nafecked
ldgt is increased by ohe if tis odd and lef
unchanged iEseen
Rules of cpetahon^
J An addihon or Subtachon the no of decimal phreg
n the Mesilt should be ayal to the no of
deoimal plares of tiat herm in the opeahon
which contain leSeY no off decima caeee
Noke i fsk any ot the atual operahon thea
Tound ofE
2) On mulBiplication os divislon, the na. of c.f in the
product or quotient s tane as he Shallest no.
of SF, in any of te factars
Same no
snicant F hit are prssen in the
lgven 58.97 Z679
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