1.

A wire has mass m=0.3+-0*003g, radius r=0*5+-0*005mm and length l=6+-0*06cm. The maximum percentage error in the measurement of its density is :

Answer»

`1`
`2`
`3`
`4`

Solution :Density is given by `rho=("MASS")/("volume")=(m)/(pir^(2)xxl)`
`(Deltarho)/(rho)xx100=((DELTAM)/(m)xx100)+2((Deltar)/(r)xx100)`
`+((Deltal)/(l)xx100)`
PUTTING the various values
`(Deltarho)/(rho)xx100[(0*003)/(0*3)xx100]+2[(0*005)/(0*5)xx100]`
`+((0*06)/(6)xx100)`
`=1+2+1=4%`.
Hence correct CHOICE is `(d)`.


Discussion

No Comment Found

Related InterviewSolutions