Quiz on Chapter 5 "Using Energy"

Ahmed Almohammed
Quiz by Ahmed Almohammed, updated more than 1 year ago
Ahmed Almohammed
Created by Ahmed Almohammed about 4 years ago
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Question 1

Question
Which of the following is a form of Energy?
Answer
  • Stored Energy
  • Potential Energy
  • Light Energy
  • Chemical Energy

Question 2

Question
Calculate how many megajoules of Energy are contained in: ( 4 800 000J )
Answer
  • 0.48J
  • 0.48MJ
  • 4.8J
  • 4.8MJ

Question 3

Question
What is Energy efficiency?
Answer
  • Energy efficiency is a measure of how much input energy is converted into wasteful output energy.
  • Energy efficiency is a measure of how much input energy is converted into useful output energy.
  • Energy efficiency is a measure of how much output energy is converted into useful output energy.
  • Energy efficiency is a measure of wasteful energy.

Question 4

Question
In Australia, climate change is likely to :
Answer
  • Cause less intense droughts.
  • Cause more frequent storms
  • Assists the spread of diseases
  • Destro the population of different speciesof plants and animals.

Question 5

Question
Improvements in house design can be achieved by:
Answer
  • Orientation of windows
  • Orientation of the garden
  • Shading north-facing windows.
  • Tinting west-facing windows.
  • Include coverings
  • Insulating the tv

Question 6

Question
The law of conservation of energy states that energy can never be created or destroyed. It can only get lost
Answer
  • True
  • False

Question 7

Question
The greater proportion of useful output energy, the greater the energy efficiency of the device
Answer
  • True
  • False

Question 8

Question
A car travelling down the freeway uses the heat energy in petrol to give it the kinetic energy to keep moving.
Answer
  • True
  • False

Question 9

Question
Heat naturally flows from regions of [blank_start]higher[blank_end] temperature to regions of [blank_start]lower[blank_end] temperature. In winter, the warm air from a heater or heating system can flow through [blank_start]any cracks or gaps[blank_end] in the walls to the [blank_start]cool air outside[blank_end] or into the cooler garage.Adding [blank_start]insulation[blank_end] to ceilings and between the walls of a home reduces the [blank_start]heat flowing outside[blank_end] in winter and inside in summer. This makes heating and cooling more [blank_start]effective[blank_end] and makes a house more [blank_start]comfortable[blank_end]
Answer
  • higher
  • lower
  • any cracks or gaps
  • cool air outside
  • insulation
  • heat flowing outside
  • effective
  • comfortable

Question 10

Question
A [blank_start]solar cell[blank_end] converts light energy from the Sun directly into [blank_start]electrical energy[blank_end]. This [blank_start]electrical[blank_end] energy is converted into the [blank_start]kinetic[blank_end] energy of the blades, as well as [blank_start]sound[blank_end] and [blank_start]heat[blank_end] energy produced by the solar fan.
Answer
  • solar cell
  • panel
  • electrical energy
  • light energy
  • electrical
  • light
  • kinetic
  • sound
  • heat

Question 11

Question
In 10 minutes, a power saw used 6050 J of electrical energy. It converted: • 1210 J into kinetic energy • 1520 J into sound energy • 3320 J into heat energy. Question (1) What is the useful output energy from the saw? [blank_start]1210J[blank_end] Question (2) What is the energy efficiency of the saw in percentage? [blank_start]1210÷6050=0.2, 0.2x100= 20%[blank_end]
Answer
  • 1210J
  • 1210÷6050=0.2, 0.2x100= 20%

Question 12

Question
An electric lamp is 25% efficient. If it receives 100 J per second of electrical energy, how much of this is transferred as light energy? [blank_start]25÷100=0.25, 0.25x100= 25J[blank_end]
Answer
  • 25÷100=0.25, 0.25x100= 25J

Question 13

Question
The need to save energy has led to new and innovative designs to increase efficiency. Some of these ideas include
Answer
  • Regenerative braking
  • Air conditioner
  • LED lightning
  • Windows
  • Light globes

Question 14

Question
How much is one kilowatt equal to in Joules?
Answer
  • 36 000 000J
  • 360 000 000J
  • 3.6MJ
  • 3 600 000J

Question 15

Question
Greater energy efficiency is indicated by less stars (or half stars) out of a possible six stars.
Answer
  • True
  • False

Question 16

Question
Complete the following table about Energy Conversiations.
Answer
  • Electrical Energy
  • Heat and Sound Energy
  • Kinetic Energy
  • Heat and Sound Energy
  • Chemical Energy
  • Sound and LIght Energy
  • Chemical Energy
  • Heat Energy

Question 17

Question
Fill in the blanks to complete the design features of this energy efficient home.
Answer
  • Eaves over windows for shading
  • Native vegetation
  • High quality pool blanket
  • 3A-rated toilet
  • Rainwater tank
  • Gas-boosted solar hot water system
  • North-facing aspect
  • South facing aspect
  • West facing aspect

Question 18

Question
Energy transformations are shown using an arrow. Complete the following chart.
Answer
  • Electrical Energy
  • Electrical, sound and heat energy
  • Kinetic, sound and heat energy
  • Chemical Energy
  • Kinetic, sound and heat energy.

Question 19

Question
Why is it that the process of converting the chemical energy of coal into electrical energy is very inefficient ?
Answer
  • Because coal is a fossil fuel
  • This is becasue heat energy is lost at each step of generating and delivering the electricity.
  • This is because it's really expensive
  • This is because coal is a limited supply.
  • This is because only a small fraction of the original chemical potential energy of coal is converted into the useful energy needed to operate the devices.

Question 20

Question
Most energy conversions waste some energy, usually releasing it as kinetic energy.
Answer
  • True
  • False
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