Efficiency
Quiz
•
Science
•
8th Grade
•
Practice Problem
•
Hard
+4
Standards-aligned
Lisa Thompson
FREE Resource
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15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of diagram is used to show energy efficiency?
Bar chart
Sankey diagram
Flow chart
Power diagram
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How do we calculate percentage efficiency?
(useful energy out ÷ total energy in) × 100
(useful energy in ÷ total energy out) x 100
(total energy out ÷ useful energy in) x 100
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Calculate the efficiency of a bulb with an input energy of 50J, which outputs 40J of thermal energy and 10J of light energy.
10%
20%
25%
50%
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which bulb is the most efficient?
Filament bulb
LED light
CFL lamp
Tags
NGSS.MS-PS3-3
NGSS.MS-PS3-4
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What type of device might this Sankey be about?
A very efficient LED light bulb
A very inefficient incandescent light bulb
A coal power plant
A wind turbine
Tags
NGSS.HS-PS3-1
NGSS.HS-PS3-4
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What might a title be for this sankey?
Electrical energy
Efficient light bulb
25 Joules of heat
Sankey for a good heater.
Tags
NGSS.MS-PS3-5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A hairdryer uses 300J of energy to produce 60J of sound energy and 240J of thermal energy. Calculate it's efficiency.
80%
90%
20%
100%
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