Test 3

Question 1

A_is the act of comparing and unknown quantity to a standard unit. Consists of a_and a_

Answer 1

Measurement, number, unit

Question 2

An_is any artificial device made for the purpose of refining, extending, or substituting for the human senses when measuring

Answer 2

Instrument

Question 3

A__system is any measuring system in which different sized units are related to each other by multiples of 10

Answer 3

Metric

Question 4

Area

Answer 4

Square meter

m^2

Question 5

Volume

Answer 5

Cubic meter

m^3

Question 6

Mass density

Answer 6

Kilogram per cubic meter

kg/m^3

Question 7

Metric ton

Answer 7

Mass

t

Question 8

Atomic mass unit

Answer 8

Mass

u

Question 9

A__is a fraction that contains both the original unit and it’s equivalent value in a new unit and is_to_

Answer 9

Conversion factor, equal, 1

Question 10

What is the basic rule for using conversion factors

Answer 10

In a conversion factor ratio, the new unit is in the numerator and the old unit is in the denominator

Question 11

A quantitive term that describes how close a measurement is to the actual or accepted value of the dimension being measured

Answer 11

Accuracy

Question 12

What is the formula for percent error

Answer 12

(|o-A|/A)•100%

O= observed value

A= accepted value

Question 13

If the percent error is_, then the measurement is considered to be accurate

Answer 13

Small

Question 14

A quantitive evaluation of the exactness of a measurement or a measuring instrument

Answer 14

Precision

Question 15

While accuracy indicates how__a measurement is to the actual value, precision indicates how__and measurement is or how_one can make a measurement

Answer 15

Close, repeatable, exactly

Question 16

What three purposes do significant digits serve

Answer 16

1- they determine the important digits you need to record when making a measurement

2- they indicate the precision of your measurement

3- it helps scientists to report measurements honestly

Question 17

The__of a measurement consists of all the certain digits +1 estimated digit

Answer 17

Significant digits

Question 18

When using significant digits the estimated digit is given in?

Answer 18

Tenths of the smallest subdivision on the instruments scale

Question 19

Rules for adding and subtracting measure data

Answer 19

1- Measure data must be the same kind of dimension and have the same units before they can be added or subtracted

2- The sum or difference of measured data cannot have greater precision than the least precise quantity in the sum or difference

3-The product or quotient of measured data cannot have more significant digits in the quantity with the fewest significant digits

4- The product or quotient of a measurement and a counted number, conversion factor, or defined value has the same number of decimal places, or same precision, I see original measurement

5- in compound calculations, do not round off at the intermediate steps

Question 20

** five steps in problem-solving**

Answer 20

1- read the problem

2- determine the method of solution

3- choose the specific tools to use

4- set up the problem, estimate, and calculate

5- check and format

Question 21

+

-

Answer 21

Least precise

Question 22

•

/

Answer 22

Least significant figure

Question 23

•

/

With counted number

Answer 23

Go to the decimal place

Question 24

Density equals

Answer 24

D=m/v

Question 25

Volume equals

Answer 25

v=m/D

Question 26

Volume units are always

Answer 26

Cubic length measures