Measurements and their Errors

Question 1

kilogram (kg)

Answer 1

SI unit for mass

Question 2

metre (m)

Answer 2

SI unit for length

Question 3

second (s)

Answer 3

SI unit for time

Question 4

mole (mol)

Answer 4

SI unit for amount of substance

Question 5

kelvin (K)

Answer 5

SI unit for temperature

Question 6

ampére (A)

Answer 6

SI unit for electric current

Question 7

tera (T)

Answer 7

10^12

Question 8

giga (G)

Answer 8

10^9

Question 9

mega (M)

Answer 9

10^6

Question 10

kilo (k)

Answer 10

10^3

Question 11

centi (c)

Answer 11

10^-2

Question 12

milli (m)

Answer 12

10^-3

Question 13

micro (μ)

Answer 13

10^-6

Question 14

nano (n)

Answer 14

10^-9

Question 15

pico (p)

Answer 15

10^-12

Question 16

femto (f)

Answer 16

10^-15

Question 17

random error

Answer 17

an error that causes readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next

Question 18

systematic error

Answer 18

an error that causes readings to differ from the true value by a consistent amount each time a measurement is made.

Question 19

precise

Answer 19

all measurements are close to the mean

Question 20

repeatable

Answer 20

the original experimenter repeats the investigation using the same method and equipment and obtains the same results

Question 21

reproducible

Answer 21

a different experimenter repeats the investigation using the same method and equipment and obtains the same results

Question 22

resolution

Answer 22

the smallest change in the quantity being measured that gives a perceptible change in the reading on the measuring instrument

Question 23

accuracy

Answer 23

a result that is close to the true value.

Question 24

uncertainty

Answer 24

an estimate of how much a measured or calculated value differs from a true value