1. Introduction

Measurement Basics — Quiz

Test your understanding of measurement basics with 5 practice questions.

Practice Questions

Question 1

When propagating uncertainties for a function $f(x,y)$ with correlated variables, which additional term must be included in the standard uncertainty calculation?

Question 2

What type of uncertainty evaluation according to the GUM is based on scientific judgment using all available information such as manufacturer specifications and calibration certificates?

Question 3

When combining two independent uncertainty components $u_1=0.10$ (degrees of freedom $\nu_1=5$) and $u_2=0.20$ (degrees of freedom $\nu_2=10$), what is the approximate effective degrees of freedom $\nu_{\mathrm{eff}}$ given by the Welch–Satterthwaite formula $\nu_{\mathrm{eff}}\approx\dfrac{u_c^4}{u_1^4/\nu_1+u_2^4/\nu_2}$, where $u_c^2=u_1^2+u_2^2$?

Question 4

Which systematic effect causes a mass measured on an analytical balance in air to be underestimated if not corrected?

Question 5

In metrology, what term refers to the closeness of agreement between measurement results obtained with the same method under identical conditions (same operator, instrument, and short time interval)?