Ch 3 - Measurement

Question 1

meter (m) measures the dimension of

Answer 1

length

Question 2

kilogram (kg) measures the dimension of

Answer 2

mass

Question 3

second (s) measures the dimension of

Answer 3

time

Question 4

ampere (A) measures the dimension of

Answer 4

electric current

Question 5

kelvin (K) measures the dimention of

Answer 5

absolute temperature

Question 6

mole (mol) measures the dimension of

Answer 6

the amount of a substance

Question 7

candela (cd) measures the dimension of

Answer 7

radiant intensity

Question 8

peta (P-) means quadrillion which is exponent form:

Answer 8

10 to the 15th power

Question 9

tera (T-) means trillion which is exponent form:

Answer 9

10 to the 12th power

Question 10

giga (G-) means billion which is exponent form:

Answer 10

10 to the 9th power

Question 11

mega (M-) means million which is exponent form:

Answer 11

10 to the 6th power

Question 12

kilo (kill-o) (k-) means thousand which is exponent form:

Answer 12

10 to the 3rd power

Question 13

hect- / hecto- (h-) means hundred which is exponent form:

Answer 13

10 to the 2nd power

Question 14

deka (da-) means ten which is exponent form:

Answer 14

10 to the 1st power

Question 15

1 is the base for metric and is in exponent form:

Answer 15

10 to the zero power

Question 16

deci- (d-) means tenth and the exponent form is

Answer 16

10 to the negative 1 power

Question 17

centi- (c-) means hundredth and the exponent form is

Answer 17

10 to the negative 2 power

Question 18

milli- (m-) means thousandth and the exponent form is

Answer 18

10 to the negative 3 power

Question 19

micro- (mu) means millionth and the exponent form is

Answer 19

10 to the negative 6th power

Question 20

nano- (n-) means billionth and the exponent form is

Answer 20

10 to the negative 9th power

Question 21

pico- (p-) means trillionth and the exponent form is

Answer 21

10 to the negative 12th power

Question 22

If your data doesn’t match predictions, what 4 things could be wrong:

Answer 22

You may have:
 used instrument wrong, 
 read instrument wrong, 
 instrument is broken/damaged, or 
 the environment wasn't good for measuring.

Question 23

Definition of accuracy

Answer 23

assessment of the measurement error.

AKA Indicates how close a measurement is to its acceptable value (smaller error means more accurate measurement).

Question 24

Definition of precision

Answer 24

assessment of the exactness of a measurement (more precise = more known digits). [Tool with finer markings can measure more precisely.]

Question 25

Definition of unit

Answer 25

a value of 1 (for any portion of a dimension).

Question 26

Measured data shows two things:

Answer 26

a number and a dimensional unit.

Question 27

France standardized measurements first, by establishing the decimal metric system.

Answer 27

True

Question 28

Number of base units the SI system has:

Answer 28

7 (m,kg,s,A,K,mol,cd)

Question 29

Precision does not apply to two things:

Answer 29

exact counts and quantities that are defined. (Precision applies to measurements, not counts or definitions.)

Question 30

Measurements can end with a zero that is significant in which case?

Answer 30

When a decimal point is present (all zeros to the right of the last nonzero digit are significant)

Question 31

T/F? Every measurement contains error, no matter how good the instrument and the observer are.

Answer 31

True

Question 32

weight indicates the amount of matter in an object, but it does not measure the amount of matter directly.

Answer 32

True

Question 33

Weight is the force of earth's gravity acting on the matter of an object. T/F?

Answer 33

True

Question 34

Gravity on earth's surface changes depending on various factors. T/F?

Answer 34

True

Question 35

Examples of quantitative data (numerical measurements):

Answer 35

temp, speed, time, volume

Question 36

Examples of qualitative data (word descriptions)

Answer 36

audibility of sound, pattern, shape, color

Question 37

T/F: Actual value of a measurement is more correctly referred to as "acceptable value" (because nothing can be perfectly measured enough to give us it's 'ACTUAL value')

Answer 37

True

Question 38

Mass is a constant for a given object (it doesn't depend on gravity).

Answer 38

True.

Question 39

Weight depends on the pull of gravity

Answer 39

True.

Question 40

What do we call the space occupied by an object?

Answer 40

it's volume.

Question 41

Density is the amount of matter (mass) contained in an object compared to its volume.

Answer 41

True (D=M/V)

Question 42

Abbreviation for the system of internationally accepted metric units:

Answer 42

SI

Question 43

measurement error tends to be reduced by averaging several measurements of the same object

Answer 43

True

Question 44

The difference between each measurement and the average of many measurements is called random error.

Answer 44

True