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Course: Alhussan Physics — Stage 7
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Alhussan Physics — Stage 7

Chapter 1: Energy

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Chapter 2: Forces

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Chapter 3: Sound

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Chapter 4: Electricity

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Chapter 5: The Earth in Space

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Quiz

Physics 1.8 Chapter 1 Review: Energy — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Efficiency of light sources (%). About how many times bigger is LED than Filament?
Dr Dabour Hub Academy - figure 1
5.0
20.0
10.0
15.0
2.
KE of 10 kg at 2 m/s?
10 J
20 J
40 J
200 J
3.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 2
A
B
C
D
4.
Stretched springs store ____ energy.
kinetic
elastic potential
chemical
nuclear
5.
True or false? Doubling speed doubles KE.
True
False
6.
GPE of 5 kg at 4 m? (g = 10)
200 J
20 J
50 J
40 J
7.
Input 100 J, useful 20 J. Efficiency?
80%
500%
200%
20%
8.
Which statement is NOT correct?
Useful output is always less than input.
Stores include chemical, kinetic, GPE, elastic and thermal stores.
Useful output can exceed input.
In every transfer some energy is dissipated.
9.
True or false? Wasted energy is mostly chemical.
True
False
10.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
11.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 4
A
B
C
D
12.
Which statement is NOT correct?
A falling ball transfers GPE to KE.
Extension = new length − original length.
Pendulums are fastest at the top.
g on Earth is 10 N/kg.
13.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
14.
True or false? Doubling speed quadruples KE.
True
False
15.
Energy in 100 g of foods (kJ). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 6
A
B
C
D
16.
GPE of 2 kg at 10 m? (g = 10)
200 J
100 J
20 J
2000 J
17.
At the top of a trampoline jump:
KE is greatest
Elastic energy is greatest
KE is zero and GPE is greatest
GPE is zero
18.
Which term matches this definition? “Energy stored in fuels, food and batteries.”
Filament bulb
KE equation
Chemical energy
Plastic deformation
19.
KE of 2 kg at 3 m/s?
6 J
9 J
3 J
18 J
20.
Extension of a spring with load. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 7
A
B
C
D
21.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
22.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
23.
True or false? Light is a store.
True
False
24.
Which term matches this definition? “Energy transfer by light and sound.”
Electrical pathway
Mechanical pathway
Waves pathway
Heating pathway
25.
Extension of a spring with load. At what value of "Force (N)" is "Extension (cm)" smallest?
Dr Dabour Hub Academy - figure 10
5
3
2
0
26.
True or false? Springs store kinetic energy.
True
False
27.
GPE of 2 kg at 4 m? (g = 10)
40 J
80 J
20 J
8 J
28.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 11
A
B
C
D
29.
Energy in 100 g of foods (kJ). Which has the greatest value?
Dr Dabour Hub Academy - figure 12
Nuts
Rice
Apple
Bread
30.
Which term matches this definition? “Unit of energy (J).”
Joule
Kilojoule
Spring constant
Energy need
31.
Light and sound are energy ____.
units
stores
fuels
pathways
32.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 13
A
B
C
D
33.
In every transfer some energy is ____.
dissipated
doubled
created
destroyed
34.
True or false? Food is a chemical store.
True
False
35.
GPE = m × g × ____.
v
t
a
h
36.
Efficiency of light sources (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 14
A
B
C
D
37.
Input 400 J, useful 80 J. Efficiency?
500%
320%
200%
20%
38.
Efficiency of light sources (%). What is the value for Filament?
Dr Dabour Hub Academy - figure 15
8
3
30
15
39.
Energy of a pendulum bob during one swing. What is the total of all the values?
Dr Dabour Hub Academy - figure 16
0.1
2.3
0.6
1.2
40.
g on Earth is ____ N/kg.
1.6
100
10
1
41.
Energy is never created or ____.
destroyed
moved
stored
measured
42.
KE of 4 kg at 2 m/s?
16 J
80 J
4 J
8 J
43.
Extension = new length − ____.
mass
time
force
original length
44.
Extension of a spring with load. Between which two values of "Force (N)" did "Extension (cm)" change the most?
Dr Dabour Hub Academy - figure 17
3 and 4
1 and 2
2 and 3
4 and 5
45.
True or false? Just before hitting the mat, kinetic energy is at a minimum.
True
False
46.
Input 100 J, useful 40 J. Efficiency?
60%
40%
250%
400%
47.
KE of 10 kg at 3 m/s?
15 J
45 J
90 J
30 J
48.
Efficiency of light sources (%). Which has the smallest value?
Dr Dabour Hub Academy - figure 18
CFL
Filament
Halogen
LED
49.
Which statement is correct?
g = 1.6 N/kg on Earth.
A pendulum is fastest at the bottom.
Springs store kinetic energy.
Wasted energy is mostly chemical.
50.
Energy moves by mechanical, electrical, heating and ____ pathways.
wave
chemical
elastic
nuclear
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Part of Chapter 1: Energy — see every lesson and quiz in this unit.
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