Have an account?
Skip to Content
Build your own quiz
11 questions
Show Answers
See Preview
- 1. Multiple Choice
The unit of energy is?
Watt
Kilojoule
Kilogramme
Volt
- 2. Multiple Choice
Complete the statement about the principal of Conservation of Energy.
Energy can be changed for one form to another but the total amount of energy
always increases
always decreases
does not change
varies according to the reaction
- 3. Multiple Choice
Conservation of Energy Questions.
Example: A battery releases 100J of energy to a lamp. The lamp releases 80J of energy as light but it also releases heat energy. How much heat energy is released? Answer=20J ( If he total energy input is 100 and 80 is the output as light, that means that 20 J is left as heat 100J-80J=20J)..Now try these questions..
Question. A battery releases 200J of energy to a lamp. the energy is converted to heat and light. 50kJ is given out as heat. How much is released as Light?
100J
150J
200J
250J
- 4. Multiple Choice
A Radio releases 250J of energy 10J is released as heat , How much is released as sound?
200J
220J
240J
260J
- 5. Multiple Choice
A torch battery releases 50J of energy as heat and 240J as light, What is the total energy released from the battery?
250J
280J
290J
300J
- 6. Multiple Choice
The % energy efficiency of an appliance is
total energy input/ useful energy output x 100
useful energy output /total energy input x100
total energy input x useful energy input x100
useful energy output /total energy input x50
- 7. Multiple Choice
In a filament bulb the electical power input is 40W andthe light (Useful) energy output is 4W. What is the % efficiency?
1%
10%
0.1%
4%
- 8. Multiple Choice
In a modern low energy bulb, the the electrical power input is 12W and the Light (useful) power output is 4W. What is the energy efficiency of this bulb?
3%
25.5%
30%
33.3%
- 9. Multiple Choice
look at the last two questions Suggest why modern bulbs are more efficient? (There is more than one correct answer)
They do not need as big an energy input
They are not as bright
There is less wasted energy
They release less heat.
- 10. Multiple Choice
This one is harder.. you need to decide what is the 'useful' energy output.
A TV takes in 600J of electrical energy and gives out 300J of light, 240J of sound and 60J of heat energy (be careful here!
9%
60%
90%
85%
- 11. Multiple Choice
(Higher level only)What is the Formula to calculate energy transfer for Kinetic Energy?
Ek=1/2 mv2
1/2mv=k
Em2=1/2k
EK2 =2mv
- Answer choicesTagsAnswer choicesTags