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Plumbing/Gasfitting Period 1 (CND) > Math & Science Period 1 (CND) > Flashcards

Math & Science Period 1 (CND) Flashcards

(75 cards)

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1
Q

Anything that has mass and occupies space?

A

Matter

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2
Q

A substance that cannot be chemically reduced any further?

A

Element

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3
Q

A substance that has indefinite shape, indefinite volume & definite mass?

A

Gas

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4
Q

What kind of change is lead melting?

A

Physical change

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5
Q

Separation of water into hydrogen & oxygen is what type of change?

A

Chemical change

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6
Q

Liquid dishwashing detergent could be classified as ?

A

Adhesive

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7
Q

1 cu/ft of water = to_____LBS

A

62.4lbs

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8
Q

1 cu/ft = to _____ imp gal

A

6.24 imp gal

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9
Q

1 cu/ft = to _____ US gal

A

7.5 US gal

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10
Q

1 US gal water = to _____ LBS

A

8.33 LBS

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11
Q

1 Imp gal of water = to ____ lbs

A

10 lbs

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12
Q

Mercury in a glass tube could be classified as?

A

Cohesive or convex

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13
Q

The molecular attraction of the molecules to each other at the surface of the liquid is called?

A

Surface tension

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14
Q

The flow of solder into a joint is the result of ?

A

adhesion & capillary attraction

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15
Q

2 factors that affect the state in which matter exists?

A

Pressure & temp.

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16
Q

Relative density of mercury?

A

13.6

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17
Q

relative density of propane gas?

A

1.5

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18
Q

1ft2 = to _______ in2

A

144 in2

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19
Q

1ft3 = to _______ ft3

A

1728ft3

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20
Q

13,6 times heavier than water?

A

Mercury

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21
Q

Density of air?

A

.076lb/ft3 or 1.29kg/m3

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22
Q

1 boiler HP - to _______BTU

A

33,475 BTU

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23
Q

Relative density of water & air?

A

1 for water & 1 for air

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24
Q

The attraction between the same molecules?

A

Cohesion

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25
The attraction between different molecules?
Adhesion
26
The ability of a liquid to rise or drop in small tubes inserted into the liquid?
Capillary Action
27
A column of 1" in height exerts a pressure of ?
.578 oz/in2
28
What is the formula for calculating the amount of material expands or contracts?
Length of Change= Original length x Coefficient of expansion x delta T
29
Correct definition of temperature is " A measurement of....."?
Molecular movement
30
You will not have _______ flow if you do not ream the pipe.
laminar flow
31
The relationship of the mass of a substance to its volume.
Density
32
The relationship between different substances?
relative density
33
Correct definition of heat is?
a quantity of energy
34
The amount of heat required to rise the temp. of one unit of mass one degree?
Specific heat capacity
35
Correct definition of latent heat is "Heat that causes a...."?
Change in state
36
Formula for converting C* to F*
F* = (1.8 x C*) + 32
37
Formula for converting F* to C*
C* = (F - 32) / 1.8
38
The standard unit (SI) for length is?
Metre (m)
39
The standard unit (SI) for volume is?
Cubic Metre (m3)
40
The standard unit (SI) for mass is?
Kilogram (kg)
41
The standard unit (SI0 for pressure, stress, & vacuum is?
Pascal (Pa)
42
The standard unit (SI) for force is?
Newton (N)
43
The standard unit (SI0 for energy is?
Joule (J)
44
The numerator is ?
The top number on a fraction
45
The denominator is?
The bottom number on a fraction
46
To convert cubic feet to imperial gallons?
Multiply 6.24imp gal/ft3
47
To convert cubic feet to US gallons?
Multiply 7.5 US gal/ft3
48
Specific heat capacity of ice/steam?
.5 BTU's or 2kj
49
Latent heat of vaporization/condensation?
970 BTU's or 2257KJ
50
Latent heat of fusion/solidification?
144 BTU's or 335KJ
51
True or False: Heat energy always flows from the hotter object to the cooler object?
True
52
Water is most dense at?
4*C or 39*F
53
Heat that causes a change in temp. .only?
Sensible heat
54
Specific heat capacity of water?
1 BTU or 4.2KJ
55
3 common states of matter?
Solid, Liquid or Gas
56
Heat that causes a change of state, not temp?
Latent Heat
57
Latent heat of propane?
154 BTU/lb or 356 KJ/Kg
58
The smallest unit of an element that can still retain its properties?
Atom
59
Made up of molecules that contain two or more different kinds of atoms chemically joined?
Compound
60
Combination of different molecules but are not chemically combined?
Mixtures
61
Inch of water in height, the pressure increases to?
.0361 psi
62
Foot of water in height, the pressure increases to?
.433 psi
63
Metre of height, the pressure increases to ?
9.81 kpa
64
Inch of mercury in height, the pressure increases to?
.491 psi
65
Atmospheric pressure is considered to be?
14.7 psia, 29.92" Hg, 101kpa or 750 mm Hg
66
Definition of pressure?
The force divided by the area
67
Definition of Force
The Amount of push or pull exerted over the entire area
68
Will not bend without breaking?
Brittle
69
Maybe stretched or drawn to shape?
Ductile
70
Can be beaten, rolled or squeezed to shape?
Malleable
71
What happens to the volume of water as it nears the freezing point?
expands slightly
72
Correct definition of coefficient of linear expansion?
The amount a material will expand for every degree of temperature change.
73
Why do most solids and liquids expand when heated?
Molecules move faster and take up more space.
74
Insulation on piping prevents what type of heat transfer?
Mainly prevents heat losses due to conduction.
75
Which of the following is not a method of heat transfer? 1)  radiation from the sun 2)  radiation from a large rock 3)  conduction to face cloth soaked in hot water 4)  convection in a heated steel bar
Convection in a heated steel bar.

Plumbing/Gasfitting Period 1 (CND) (6 decks)

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