PHEP 1 Matter

Question 1

Which of the four elements listed as it is the lightest per unit volume?

Answer 1

Calcium

Question 2

Which of the four elements listed as the lightest per atomic weight?

Answer 2

Carbon

Question 3

Water is…

Answer 3

A compound

Question 4

When two or more atoms combine chemically, the particle that’s formed is a ___?

Answer 4

molecule

Question 5

A compound is formed when the atoms of two or more elements become_____?

Answer 5

Chemically bonded

Question 6

Our air (or atmosphere) is composed by volume of ____ and ____

Answer 6

21% oxygen, 79% nitrogen

Question 7

Atmospheric pressure at sea level is normally considered to be approximately

Answer 7

14.7 psi

Question 8

When molecules are tightly bound they are in a

Answer 8

Solid state

Question 9

Liquids offer a high resistance to any force tending to change their

Answer 9

Volume

Question 10

A pound is a unit of

Answer 10

Force

Question 11

A temperature reading of 59°F is equivalent to

Answer 11

15 degrees C

Question 12

A temperature reading of 85°C is equivalent to

Answer 12

185°F

Question 13

Density is a ratio between mass and

Answer 13

Volume

Question 14

When the temperature of a substance increases, or the pressure is reduced, the substance…

Answer 14

Expands and becomes less dense

Question 15

If an object weighs 210 pounds and the volume is 3.5 ft.³ what is the objects density?

Answer 15

60 ft.³

Question 16

Water has a density of 62.4 pounds per feet cubed. The volume of 1000 pounds of water is

Answer 16

16 ft.³

Question 17

What can be used to find the weight of objects which cannot be waited on scales

Answer 17

Specific gravity

Question 18

A piece of concrete weighs 400 pounds in air and 350 pounds in water. What is its specific gravity

Answer 18

8

Question 19

Specific weight most nearly means

Answer 19

Density

Question 20

Atmospheric pressure is

Answer 20

Greater at sea level

Question 21

The term viscosity most nearly means

Answer 21

Resistance to physical change

Question 22

The pressure upward at any given point in a liquid is ____ the downward pressure at that point

Answer 22

The same as

Question 23

What is the pressure on the bottom of a discharge line at 200 feet deep?

Answer 23

12,480 lbs/ft^2

Question 24

Hey slanting penstock 2000 feet long conveys water from a reservoir to a turbine 800 feet below sea level of the reservoir. Pressure at the turbine is…

Answer 24

49,920 lbs/ft^2

Question 25

What is the force on the bottom of a tank 6’ x 8’ x 12’ failed to a depth of 3 feet with water

Answer 25

8,985.6 lbs
Force = area x height x density

Question 26

(What is the force on the bottom of a tank 6’ x 8’ x 12’ failed to a depth of 3 feet with water)
If the tank in this problem is filled to the top with oil who’s density is 72 pounds per cubic foot what pressure is being exerted on one square inch of the base?

Answer 26

6 lbs/sq in.
Height x specific weight divided by 144

Question 27

To convert gauge pressure to absolute pressure at sea level conditions

Answer 27

Add 14.7 (assuming pressure of atmosphere)

Question 28

The pressure against the large piston in a confined space is

Answer 28

Proportional to the area on a small piston

Question 29

Fluid pressure might be expressed properly by?

Answer 29

Lbs/in^2

Question 30

The forces that are required to move fluid through a siphon are?

Answer 30

Friction head and static head

Question 31

What are the formulas for converting Fahrenheit to Celsius

Answer 31

C= 5/9 (F-32
F= 9/5 (C) + 32

Question 32

Formula for density (specific weight)

Answer 32

D= total weight/ volume, answer is cubed

Question 33

Formula for specific gravity with objects on air to objects in water

Answer 33

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

Question 34

What is a cubic ft of water

Answer 34

62.4 lb

Question 35

Formula for pressure per sq inch

Answer 35

= (Height in ft x specific weight per cubic ft) /144