Physical Quantities & Units

Question 1

A property of a material or system that can be obtained and quantified by measurement indicating the appropriate base and unit

Answer 1

Physical Quantity

Question 2

Can be expressed as a value consists of numerical magnitude and the unit in which it is measure: 3.9 grams, 50.0 dL, 19.3g/cm³

Answer 2

Physical Quantity

Question 3

can be expressed as a value of certain unit: grams, kilograms, or pounds

Answer 3

Physical Quantity

Question 4

An operation by which an unknown physical quantity is compared with a known quantity based on standard

Answer 4

Measurement

Question 5

Using your idea of something similar in size or amount to determine the size of the new object

Answer 5

Estimation

Question 6

Helps to make a rough measurement of an object

Answer 6

Estimation

Question 7

Useful when you are in a hurry and exact numbers are not required

Answer 7

Estimation

Question 8

how close a measurement is to the true value

Answer 8

Accuracy

Question 9

Is comparison of a measurement to the actual or accepted value

Answer 9

Accuracy

Question 10

how close the measurements are to each other (reproducibility)

Answer 10

Precision

Question 11

the correct value based on reliable references or the physical quantities with fixed values
Example: density & specific heat capacity

Answer 11

Accepted value

Question 12

the value obtained in lab experimentations

Answer 12

Experimental value

Question 13

accepted value - exp. value
Can be (+) or (-)

Answer 13

Error

Question 14

the absolute value of the error divided by the accepted value, then multiplied by 100%

Answer 14

Percent error

Question 15

Le Systeme International d’Unites

Answer 15

SI system

Question 16

True or False:
All measurement systems have standards. Standards are exact quantities that everyone agrees to use as a basis of comparison.

Answer 16

True

Question 17

Why does the rest of the world uses SI System?

Answer 17

The SI (International System of Units) system is the form of measurement typically used by scientists.

• Measurements are easily understood by all scientists
• Measurements are easier to convert than the English system
• There are 7 SI base units
• From these bae units, all other SI units of measurement can be derived.
• Derived units are used for measurements such as volume, density, and pressure.

Question 18

SI stands for?

Answer 18

International System of Units

Question 19

What are the commonly used physical quantities?

Answer 19

1. Length
2. Volume
3. Mass
4. Density
5. Temperature
6. Time

Question 20

The SI system is based on the number _?

Answer 20

10

Question 21

SI Unit of length

Answer 21

ft, m, cm

Question 22

SI unit of mass

Answer 22

kg, g

Question 23

SI unit of volume

Answer 23

m³, liter

Question 24

SI unit of density

Answer 24

kg/m³

Question 25

SI unit of temperature

Answer 25

K, C

Question 26

SI unit of time

Answer 26

s

Question 27

are exact quantities that everyone agrees to use as a basis of comparison

Answer 27

Standards

Question 28

the distance between two points

Answer 28

Length

Question 29

basic unit of length in the SI System

Answer 29

Meter

Question 30

a variation of a length measurement

Answer 30

Area

Question 31

a measurement of the amount of space something takes up

Answer 31

Volume

Question 32

Basic unit of volume

Answer 32

Liter

Question 33

Objects without a definite length, width or height, can use w__ d_____ to determine volume.

Answer 33

water displacement

Question 34

a measurement of the amount of matter in an object

Answer 34

Mass

Question 35

how much matter is in something (mass), compared to the amount of space it takes up (volume)

Answer 35

Density

Question 36

a measure of the kinetic energy of the atoms in an object

Answer 36

Temperature

Question 37

True or False: The specific gravity of a substance is the density of this substance divided by the density of water, which is 1.00 g/mL. Unitless quantity

Answer 37

True

Question 38

A widely used technique for such conversions using the rules of algebra

Answer 38

Factor-label method/ unit-factor method/ Dimensional Analysis

Question 39

The ratio of the mass of an object to its volume

Answer 39

Density

Question 40

An intensive property that depends only on the composition of a substance, not the size of the sample

Answer 40

Density

Question 41

measures the volume of an irregularly shaped object

Answer 41

Water Displacement Method

Question 42

When mass is measured in grams, and volume in cubic centimeters, the unit of density then is?

Answer 42

grams per cubic centimeter (g/cm³)

Question 43

True or False: The volume of substances will change with temperature, so accurate volume-measuring devices are calibrated at a given temperature

Answer 43

True

Question 44

For large distances, it is most appropriate to express measurements in?

Answer 44

km