(Chap. 1) Measurement, accuracy, & Precision, and Significant figures

Question 1

every measurement includes some _____________

Answer 1

uncertainty

Question 2

give example of measuring tools we used

Answer 2

weighing scale
analytical balance

Question 3

what measurements used in ancient times

Answer 3

length of foot
width of finger
distance of the step

Question 4

these units became a part of the ___________________________________—(length of foot, width of finger, distance of the step)

Answer 4

english system of measurement

Question 5

what year does the development of the metric system?

Answer 5

1790

Question 6

what year established the international system of units?

Answer 6

1960

Question 7

the units of this system are called ___________________, from the french systeme international d’ Unites

Answer 7

SI Units

Question 8

based on seven fundamental units, or base units each identifies with a physical quantity such as mass, length, and time.

Answer 8

SI Units

Question 9

enumerate the 7 fundamental quantity and its symbol

Answer 9

mass (m)
length (l)
time (t)
current (I)
temperature (T)
amount of substance (n)
luminous intensity (lv)

Question 10

what are the 7 SI Unit? gives its symbols

Answer 10

kilogram (kg)
meter (M)
second (s)
ampere (A)
kelvin (K)
mole (mol)
candela (cd)

Question 11

all other units are called __________

Answer 11

derived units

Question 12

combinations of the seven base units

Answer 12

SI derived units

Question 13

a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit

Answer 13

metric prefixes

Question 14

indicates the closeness of the measurement to the true or accepted value

Answer 14

accuracy

Question 15

closeness of the measurement to each other

Answer 15

precision

Question 16

inherent part of the quantized world

Answer 16

measurement errors

Question 17

errors are caused by faulty calibrations of standardizations (______________) or by random variations and uncertainties in results (__________)

Answer 17

systematic error
random error

Question 18

give 3 ways to reduce measurement error

Answer 18

• double check all measurement of accuracy
  *double check formulas are correct
  *take measurements in controlled conditions

Question 19

if the digit removed is more than 5, the preceding number is _______________

Answer 19

increased by 1