Question

Question 11 (5 points)

Fossil fuels are considered a _______ energy source because they take millions of years to form.
Question 11 options:


A)
non-renewable


B)
biological


C)
renewable


D)
sustainable
Question 12 (5 points)

Which of the following solid fuels has the highest heating value?
Question 12 options:


A)
Coke


B)
Bituminous coal


C)
Wood


D)
Lignite
Question 13 (5 points)

Based on their specific heat values, compare the amounts of energy it would take to increase the temperature of a kg of benzene and a kg of methyl alcohol by 5 degrees Celsius.
Question 13 options:


A)
Neither can increase temperature unless they change to a solid state first.


B)
It would take more energy to increase the temperature of benzene.


C)
Both would require much more energy than a kg of water to increase.


D)
It would take more energy to increase the temperature of methyl alcohol.
Question 14 (5 points)

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What's the efficiency of the machine?
Question 14 options:


A)
82 percent


B)
94 percent


C)
106 percent


D)
97 percent
Question 15 (5 points)

If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is
Question 15 options:


A)
273°C.


B)
873°C.


C)
705°C.


D)
327°C.
Question 16 (5 points)

Which force creates resistance between surfaces and means significant effort is needed just to make something move in all practical applications?
Question 16 options:


A)
Friction


B)
Horsepower


C)
Work force


D)
Normal
Question 17 (5 points)

Which substance is a liquid fuel used in rocket engines?
Question 17 options:


A)
Sodium nitrate


B)
Ammonia


C)
Liquid nitrogen


D)
Potassium perchlorate
Question 18 (5 points)

Which one of the following indicates a drop in temperature?
Question 18 options:


A)
The brass on a bent bimetallic strip is on the outside curve.


B)
The alcohol in a thermometer expands.


C)
The column of liquid in a thermometer moves up three degrees.


D)
A bimetallic strip bends so that the steel is on the outside curve.
Question 19 (5 points)

In choosing a new machine, your boss wants you to be as cost efficient as possible, but she also wants the best efficiency. Consider the following options. Which is your best option?
Option 1: This $5,000 machine is supplied energy at a rate of 1,900 W and does useful work at a rate of 1,786 W.
Option 2: This $4,500 machine is supplied energy at a rate of 1,450 W and does useful work at a rate of 1,300 W.
Option 3: This $4,750 machine is supplied energy at a rate of 1950 W and does useful work at a rate of 1833 W.
Option 4: This $4,750 machine is supplied energy at a rate of 2,000 W and does useful work at a rate of 1,822 W.
Question 19 options:


A)
Option 3


B)
Option 1


C)
Option 4


D)
Option 2
Question 20 (5 points)

Which two elements primarily make up fossil fuels?
Question 20 options:


A)
Carbon and nitrogen


B)
Hydrogen and oxygen


C)
Hydrogen and carbon


D)
Carbon and oxygen

Answer 1

Here are the answers:

11. A (non-renewable)
12. A (Coke)
13. D (It would take more energy to raise methyl alcohol)
14. B (94%)
15. D (327°C)
16. A (Friction)
17. B (Ammonia)
18. D (bimetallic strip bends with steel on outside → temperature drop)
19. A (Option 3 — same high efficiency as Option 1 but lower cost)
20. C (Hydrogen and carbon)