1796042
Question 1
Question
Which of these are forms of energy waiting to be turned into one of the other forms? (Tick all that apply)
Answer
-
Thermal
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Chemical potential
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Gravitational potential
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Kinetic
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Electrical
-
Light
-
Elastic potential
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Nuclear
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Sound
Question 2
Question
What is the principle of the conservation of energy?
Answer
-
Energy can never be created or destroyed; it can only be converted from one form to another.
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Energy can be created or destroyed; it can also be converted from one form to another.
Question 3
Question
A light bulb has a total energy input of 200J. 190J of this is wasted energy. Work out the energy efficiency.
Answer
-
10%
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5%
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90%
Question 4
Question
Draw a Sankey diagram for a candle which wastes most of its energy as heat.
Answer
-
Image:physics_1 (image/png)
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Image:physics_2 (image/png)
Question 5
Answer
-
kinetic ---> electrical
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electrical ---> sound ---> light
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gravitational potential ---> kinetic ---> electrical
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gravitational potential ---> electrical ---> sound
Question 6
Question
Tick all of the true statements.
Answer
-
A device which transfers one form of energy into another is called a transducer.
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Energy is normally wasted as heat and sound.
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Wasted energy dissipates into the surroundings.
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Dissipated energy cannot be re-used.
Question 7
Question
Which type of heat energy transfer only takes place in fluids and involves warmer, less dense regions of fluid moving upwards and being replaced by colder, sinking fluids?
Answer
-
Conduction
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Convection
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Radiation
Question 8
Question
All types of energy require particles to be transferred.
Answer
- True
- False
Question 9
Question
Which of these loses energy more quickly?
Answer
-
A bright, shiny surface
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A dull, black surface
Question 10
Question
Which features of a vacuum flask prevent heat loss by conduction?
Answer
-
A thin vacuum between the walls
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Silvered walls
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Cork or plastic stopper
Question 11
Question
Find the work done by a car driving at a force of 500N 200m down a road.
Answer
-
1000J
-
5000J
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700J
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300J
Question 12
Question
What is power?
Answer
-
Power is the rate of doing work.
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Power = work done x time taken
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Power = work done/time taken
Question 13
Question
How fast does a stone weighing 4kg fall from a height of 200m?
Answer
-
28 m/s
-
800 m/s
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63 m/s
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