11)1unified atomic mass unit =
1.66*10-27kg
12)Size of the atomic nucleus is of the order of
10-14m
13)The length of the typical virus is if the order of
10-8m
14)Distance of the moon from the earth is
108m
15)The uncertainty in the measuring instruments is called
Error
16)The errors which arises from the errors due to imperfect design or calibration of the measuring instruments are called
Instrumental errors
17)The errors which occurs irregularly and hence random with respect to size and sign are called
Random errors
18)The errors associated with the resolution of the instrument is called as
Least count errors
19)The arithmetic mean of all the absolute errors taken is called as
Mean absolute error
20)When relative error is expressed in per cent then it is called as
Percentage error