When number having uncertainties or errors are used to compute other numbers. These will be uncertain. Its is especially important to underset this when a number obtained from measurements is to be compared with a value obtained from theoretical prediction. Assume a student wants to verify the value of `pi`, the ration of circumference to diameter of a cricle. the correct value of ten digits is 3.141592654. he draws a circle and measures its diameter and circumference to its nearest milimeter obtaining the values 135 mm and 424 mm, respectively. using a calculator he finds `pi`=3.140840741.
Why does measured value not match with calculated value ?

Options

A. due to systematic error
B. due to error n calculation
C. due to random error
D. lack of precision in measuring

Answer

D

Explanation

When an instrument in used to measure , it has its least count. Therefore, we can measure the value to nearest correct value and not absolute value.