Take this Quiz: A-Level Physics: Measurements and Uncertainties | Zestly

Question 1

A student measures the length of a rod as $12.5 \pm 0.2 	ext{ cm}$ and its mass as $45.0 \pm 0.5 	ext{ g}$. What is the percentage uncertainty in the calculated density of the rod, assuming the rod is a uniform cylinder with a measured radius of $1.20 \pm 0.05 	ext{ cm}$?

Accepted Answer

11.0%

Question 2

Which of the following statements correctly describe the nature of errors in physical measurements?

Accepted Answer

Random errors can be reduced by repeating measurements and calculating a mean.

Question 3

A capacitor has a charge $Q = 4.0 	imes 10^{-6} 	ext{ C}$ and a potential difference $V = 2.0 \pm 0.1 	ext{ V}$. What is the absolute uncertainty in the capacitance $C = \frac{Q}{V}$?

Accepted Answer

$0.10 	imes 10^{-6} 	ext{ F}$

Question 4

Which of the following represent base SI units?

Answer

Newton

Answer

Kelvin

Answer

Mole

Answer

Joule

Question 5

A ball falls from rest. The distance $s$ is measured as $2.00 \pm 0.02 	ext{ m}$ and the time $t$ as $0.64 \pm 0.01 	ext{ s}$. Using $s = \frac{1}{2}gt^2$, what is the percentage uncertainty in the calculated value of $g$?

Answer

1.5%

Answer

2.0%

Answer

3.1%

Answer

4.1%