Quiz
Quiz on Chapter 5 "Using Energy"
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Perguntas do quiz (20)
1Which of the following is a form of Energy?

- AStored Energy
- BPotential Energy
- CLight Energy
- DChemical Energy
2Calculate how many megajoules of Energy are contained in:
( 4 800 000J )
- A0.48J
- B0.48MJ
- C4.8J
- D4.8MJ
3What is Energy efficiency?

- AEnergy efficiency is a measure of how much input energy is converted into wasteful output energy.
- BEnergy efficiency is a measure of how much input energy is converted into useful output energy.
- CEnergy efficiency is a measure of how much output energy is converted into useful output energy.
- DEnergy efficiency is a measure of wasteful energy.
4In Australia, climate change is likely to :

- ACause less intense droughts.
- BCause more frequent storms
- CAssists the spread of diseases
- DDestro the population of different speciesof plants and animals.
5Improvements in house design can be achieved by:

- AOrientation of windows
- BOrientation of the garden
- CShading north-facing windows.
- DTinting west-facing windows.
- EInclude coverings
- FInsulating the tv
6The law of conservation of energy states that energy can never be created or destroyed. It can only get lost

- AVerdadeiro
- BFalso
7The greater proportion of useful output energy, the greater the energy efficiency of the device

- AVerdadeiro
- BFalso
8A car travelling down the freeway uses the heat energy in petrol to give it the kinetic energy to keep moving.

- AVerdadeiro
- BFalso
9Heat 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]

- Ahigher
- Blower
- Cany cracks or gaps
- Dcool air outside
- Einsulation
- Fheat flowing outside
- Geffective
- Hcomfortable
10A [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.

- Asolar cell
- Bpanel
- Celectrical energy
- Dlight energy
- Eelectrical
- Flight
- Gkinetic
- Hsound
- Iheat
11In 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]
- A1210J
- B1210÷6050=0.2, 0.2x100= 20%
12An 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]
- A25÷100=0.25, 0.25x100= 25J
13The need to save energy has led to new and innovative designs to increase efficiency. Some of these ideas include

- ARegenerative braking
- BAir conditioner
- CLED lightning
- DWindows
- ELight globes
14How much is one kilowatt equal to in Joules?

- A36 000 000J
- B360 000 000J
- C3.6MJ
- D3 600 000J
15Greater energy efficiency is indicated by less stars (or half stars) out of a possible six stars.

- AVerdadeiro
- BFalso
16Complete the following table about Energy Conversiations.

- AElectrical Energy
- BHeat and Sound Energy
- CKinetic Energy
- DHeat and Sound Energy
- EChemical Energy
- FSound and LIght Energy
- GChemical Energy
- HHeat Energy
17Fill in the blanks to complete the design features of this energy efficient home.

- AEaves over windows for shading
- BNative vegetation
- CHigh quality pool blanket
- D3A-rated toilet
- ERainwater tank
- FGas-boosted solar hot water system
- GNorth-facing aspect
- HSouth facing aspect
- IWest facing aspect
18Energy transformations are shown using an arrow. Complete the following chart.

- AElectrical Energy
- BElectrical, sound and heat energy
- CKinetic, sound and heat energy
- DChemical Energy
- EKinetic, sound and heat energy.
19Why is it that the process of converting the chemical energy of coal into electrical energy is very inefficient ?

- ABecause coal is a fossil fuel
- BThis is becasue heat energy is lost at each step of generating and delivering the electricity.
- CThis is because it's really expensive
- DThis is because coal is a limited supply.
- EThis 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.
20Most energy conversions waste some energy, usually releasing it as kinetic energy.

- AVerdadeiro
- BFalso
Informações
- Descrição
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- Autor
- Ahmed Almohammed
- Idioma
- English
- Visualizações
- 105
- Etiquetas
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