PHEPC1

Question 1

Of aluminum, barium, calcium, and carbon, which has the lightest atomic weight?

Answer 1

Carbon

Carbon=12.011
Aluminum=26.98
Calcium=40.08
Barium=137.36

PHEP Ch1 p.2

Question 2

Of aluminum, barium, calcium, and carbon, which is the lightest per unit volume?

Answer 2

Calcium

Specific gravity
Calcium=1.55
Carbon=1.88
Aluminum=2.699
Barium=3.5

PHEP Ch1 p.2

Question 3

Which element has the lightest atomic weight?

Answer 3

Hydrogen (1.008)

PHEP Ch1 p.2

Question 4

If we take two like atoms of hydrogen and combine them chemically, they form a ___________.

Answer 4

Molecule

PHEP Ch1 p.3

Question 5

When unlike atoms are bound together chemically, they form a molecule of a ___________.

Answer 5

Compound

PHEP Ch1 p.3

Question 6

Why is water a compound?

Answer 6

Because it’s molecules are composed of two kinds of atoms, hydrogen and oxygen.

PHEP Ch1 p.3

Question 7

Do salt and pepper molecules combine when mixed?

Answer 7

No.

PHEP Ch1 p.5

Question 8

Air is normally composed of ______% oxygen and ______% nitrogen by volume.

Answer 8

21, 79

PHEP Ch1 p.7

Question 9

The air at sea level and 32 degrees F normally exerts a pressure of approximately ______.

Answer 9

14.7 psi

PHEP Ch1 p.7

Question 10

When matter is in a ____________ state, the molecules are closely bound together but not permanently touching.

Answer 10

solid

PHEP Ch1 p.9

Question 11

Liquids offer a high resistance to force tending to change their ______.

Answer 11

volume

PHEP Ch1 p.9

Question 12

To change a fahrenheit reading to a centigrade reading, subtract ___________ and multiply by ______ / ______.

Answer 12

32, 5/9

PHEP Ch1 p. 17

Question 13

To change a centigrade reading to a fahrenheit reading, multiply by ______ / ______ and add ___________.

Answer 13

9/5, 32

PHEP Ch1 p. 17

Question 14

Specific weight most nearly means ______.

Answer 14

density

PHEP Ch1 p.19

Question 15

Density is a ratio between ______.

Answer 15

mass (weight) and volume

PHEP Ch1 p.19

Question 16

A pound is a unit of______.

Answer 16

force

PHEP Ch1 p.19

Question 17

Density = ______________ over _________________.

Answer 17

Weight over Volume

PHEP Ch1 p.20

Question 18

Specific Weight is defined as what? How is it found?

Answer 18

Weight per unit volume. Density of a material times gravity

PHEP Ch1 p.21

Question 19

What is the density of a cubic foot of water?

Answer 19

62.4 pounds

PHEP Ch1 p.21

Question 20

______ is useful in finding weight of objects which cannot be weighed on scales.

Answer 20

specific gravity

PHEP Ch1 p.21

Question 21

What is the equation of specific gravity?

Answer 21

Specific gravity = weight in air / ( weight in air-weight in water)

PHEP Ch1 p.21

Question 22

The air surrounding earth exerts a pressure known as ________________ pressure.

Answer 22

atmospheric

PHEP Ch1 p.25

Question 23

Air at sea level, when 32 degrees Fahrenheit, exerts a pressure of approximately ______________.

Answer 23

14.7 psi.

PHEP Ch1 p.25

Question 24

Where is atmospheric pressure at it’s greatest?

Answer 24

Sea level

PHEP Ch1 p.26

Question 25

______ is a characteristic of a liquid that denotes the opposition to change its shape.

Answer 25

viscosity PHEP Ch1 p.27

Question 26

At the base of a cube, force is _____________ _____________ .

Answer 26

Evenly distributed PHEP Ch1 p.27

Question 27

A useful law about static fluid pressure is that all points in a fluid which are at ______ are at the same pressure, and the static pressure at any point in a fluid is exerted equally in all directions.

Answer 27

the same elevation PHEP Ch1 p.27

Question 28

Pressure = ___________ x ____________.

Answer 28

Height x Density PHEP Ch1 p.29

Question 29

What is the equation for total force on a surface in a liquid? (F = ___ x ____ x ____)

Answer 29

Force = area x height x density PHEP Ch1 p.31

Question 30

How do you find absolute pressure?

Answer 30

Absolute pressure is found by adding the weight of the atmosphere (14.7psi) to the gage pressure. PHEP Ch1 p.33

Question 31

Forces exerted on different sized pistons in a confined space is _____________ _____________ to the surface areas of the pistons.

Answer 31

directly proportional PHEP Ch1 p.39

Question 32

Fluid pressure might be expressed properly as:

Answer 32

force per unit area on an object from fluid PHEP Ch1 p.39

Question 33

The force necessary to move a liquid through a siphon is the force necessary to overcome the ______ and the ______ of the siphon tube.

Answer 33

static head, friction head PHEP Ch1 p.42