A bulb of 100 W means that it will consume electrical energy at the rate of:
100 kJ per second.
100 kJ per hour.
100 joules per second.
100 joules per hour.
4. Multiple Choice
30 seconds
1 pt
All wires used in electric circuits should be covered with:
a colored material.
a conducting material.
an insulating material.
none of these.
5. Multiple Choice
30 seconds
1 pt
The electric meters in our houses measure the electrical energy consumed in __________.
circuit
Earth
kilowatt-hours
3.6 x 106
6. Multiple Choice
30 seconds
1 pt
One kilowatt-hour is equivalent to __________ joules.
kilowatt-hour
3.6 x 106
red
none of these
7. Multiple Choice
30 seconds
1 pt
The flow of charge per unit time through a conductor is called __________.
circuit
kilowatt-hour
overloading
electric current
8. Multiple Choice
30 seconds
1 pt
The level of charge per unit time on a body is called __________ of the body.
overloading
potential difference
leclanche
Germanium
9. Multiple Choice
30 seconds
1 pt
Electricity moves only in a __________ circuit.
circuit
difference in potential
closed
open
10. Multiple Choice
30 seconds
1 pt
Homes are wired in __________.
series circuit
parallel circuit
kilowatt-hour
negative, positive
11. Multiple Choice
30 seconds
1 pt
When we turn the switch to the off position the circuit is __________.
closed
open
negative, positive
overload
12. Multiple Choice
30 seconds
1 pt
When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.
parallel
series
open
closed
13. Multiple Choice
30 seconds
1 pt
When you attach a wire to both terminals of a dry cell, the electrons flow from the __________ terminal to the __________ terminal.
negative, positive
positive, negative
negative, neutral
neutral, positive
14. Multiple Choice
30 seconds
1 pt
The source of electric current for a hand-held transistor radio is __________.
cell
conductor
material
current
15. Multiple Choice
30 seconds
1 pt
Electricity used in homes is generated in __________.
power plant
dynamo
cell
conductor
16. Multiple Choice
30 seconds
1 pt
A closed circuit has its every part made of __________.
electric current
conducting material
dynamo
cell
17. Multiple Choice
30 seconds
1 pt
We should switch off the main switch if a person accidentally touches a live wire.
True
False
18. Multiple Choice
30 seconds
1 pt
A large number of electrical appliances connected in a circuit can be operated together.
True
False
19. Multiple Choice
30 seconds
1 pt
A large number of electrical appliances connected in a circuit can not be operated together.
True
False
20. Multiple Choice
30 seconds
1 pt
Electrical work done by electric current is equal to electrical power consumed.
Electrical work done by electric current is equal to electrical energy consumed.
True.
It depends on the number of rodents.
None of these answer choices are correct.
21. Multiple Choice
30 seconds
1 pt
Pure water is a good conductor of electricity.
True
False
22. Multiple Choice
30 seconds
1 pt
When a circuit is closed the electric current does not flow through it.
True
False
23. Multiple Choice
30 seconds
1 pt
A bulb is the source of electricity in a flashlight.
True.
False.
24. Multiple Choice
30 seconds
1 pt
Glass is a good conductor.
True
False
25. Multiple Choice
30 seconds
1 pt
A bicycle works by electricity.
True
False
26. Multiple Choice
30 seconds
1 pt
Current carrying wires must be insulated because it is dangerous to anyone to touch current carrying wires if they are not insulated.
True
False
27. Multiple Choice
30 seconds
1 pt
Which circuit will light up?
A, B
B, C
C, D
D, F
28. Multiple Choice
30 seconds
1 pt
The relationship between electric current, electric power and potential difference is:
Electric Current (I) = Electric Power (P) / Potential Difference (V)
Electric Current (I) = Potential Difference (V)/Electric Power (P)
Electric Power (P) = Electric Current (I)/ Potential Difference (V)
Potential Difference (V) = Electric Current (I)/Electric Power (P)
29. Multiple Choice
30 seconds
1 pt
Three sources of electricity are:
Electric generator, solar cells and dry cells.
Solar cells, dry cells and gun powder.
Electric generators, electric motors and flubber.
None of these answer choices are correct.
30. Multiple Choice
5 minutes
1 pt
A current of 4 A flows through a 12 V car headlight bulb for t10 minutes. How much electrical energy is consumed during this time?
Remember: W=VIt
28800 J or 28.8 KJ
600 s
4.55 A
120 V
31. Multiple Choice
5 minutes
1 pt
What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V? Remember: I = P/V
4.55 A
28800 J or 28.8 KJ
80 W
200 W
32. Multiple Choice
5 minutes
1 pt
A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
Remember: I=P/V
80 W
200 W
2.5 A
4.55 A
33. Multiple Choice
5 minutes
1 pt
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
Remember: V=IR and P=VI
80 W
200 W
2.5 A
22.5 KJ
34. Multiple Choice
5 minutes
1 pt
Calculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
Remember: I=V/R and P=VI
200 W
80 W
2.5 A
79.20 KJ
35. Multiple Choice
5 minutes
1 pt
Calculate the electrical energy consumed when a potential difference of 5 V is applied across a resistor of 2 ohms for 30 minutes.
Remember: V=IR and I=V/R
80 W
200 W
22500 J or 22.5 KJ
4500 J or 4.5 KJ
36. Multiple Choice
5 minutes
1 pt
A current of 0.5 A flows through a resistance of 10 ohms for half an hour. Find the amount of electrical energy consumed by the resistance.
Remember: V = IR P = VI E = Pt
22500 J or 22.5 KJ
4500 J or 4.5 KJ
79.2 W
2.5 A
37. Multiple Choice
30 seconds
1 pt
Does this statement best describe a parallel or a series circuit.
Different voltages are dropped across each resistor.
Parallel circuit
Series circuit
38. Multiple Choice
30 seconds
1 pt
Does this statement best describe a parallel or a series circuit.
Different currents flow through each resistor.
Parallel circuit
Series circuit
39. Multiple Choice
30 seconds
1 pt
Does this statement best describe a parallel or a series circuit.
If one part of the circuit fails, the other parts still work.
Parallel circuit
Series circuit
40. Multiple Choice
30 seconds
1 pt
Does this statement best describe a parallel or a series circuit.
The total resistance is equal to the sum of the individual resistances.
Parallel circuit
Series circuit
41. Multiple Choice
30 seconds
1 pt
A series circuit is composed of a 10.0 V battery and three resistors, which are 2.00 Ώ, 6.00 Ώ and 12.0 Ώ. How much current flows through the 12.0 Ώ resistor?
0.500 A
1.00 A
1.00 V
0.500 W
42. Multiple Choice
30 seconds
1 pt
Protons and electrons...
repel each other.
attract each other.
have no effect on each other.
43. Multiple Choice
30 seconds
1 pt
When switch is turned on the circuit is?
Open
Closed
44. Multiple Choice
30 seconds
1 pt
Opposites ___________
repel
attract
stick
move
45. Multiple Choice
30 seconds
1 pt
When switch is turned off the circuit is?
Open
Closed
46. Multiple Choice
30 seconds
1 pt
What is a Switch?
A device used to control to flow of electricity
Something that turns on lights
Imbalance of charges
A path that electricity flows through
47. Multiple Choice
30 seconds
1 pt
Is this circuit open or closed?
Closed
Open
48. Multiple Choice
30 seconds
1 pt
What is a Circuit?
Lightning
Static Electricity
The path that electricity flows through
Electrons flowing
49. Multiple Choice
30 seconds
1 pt
Which is not a Conductor?
Foil
Penny
Iron
Rubber
50. Multiple Choice
30 seconds
1 pt
What is a Conductor?
a material that easily allows electricity to flow through it
a material that does not allow electricity to flow easily
51. Multiple Choice
30 seconds
1 pt
What is an Insulator?
a material that easily allows electricity to flow through it
a material that does not allow electricity to flow easily
52. Multiple Choice
30 seconds
1 pt
Which is the Source?
Battery
Wire
Light Bulb
Switch
53. Multiple Choice
30 seconds
1 pt
Same charges __________
repel
attract
stick
come together
54. Multiple Choice
30 seconds
1 pt
What do magnets stick to?
copper
wood
iron
plastic
55. Multiple Choice
30 seconds
1 pt
Magnetism is a type of ____________
force
book
plant
animal
56. Multiple Choice
30 seconds
1 pt
When two magnets attract, they ______________
push apart
change color
get colder
pull together
57. Multiple Choice
30 seconds
1 pt
When two magnets repel, they ________________
change color
pull together
push apart
get colder
58. Multiple Choice
30 seconds
1 pt
The force of magnetism can go through many materials.
True
False
59. Multiple Choice
30 seconds
1 pt
Magnets have a north and a south ___________
shape
color
pole
region
60. Multiple Choice
30 seconds
1 pt
Two north poles will attract.
True
False
61. Multiple Choice
30 seconds
1 pt
A north pole and a south pole will attract.
True
False
62. Multiple Choice
30 seconds
1 pt
What would we call a nail that can pick up a paperclip because it is touching a magnet?
temporary magnet
poles
force
detector
63. Multiple Choice
30 seconds
1 pt
The force of magnetism is stronger when magnets are ________________
cold
round
closer together
farther apart
64. Multiple Choice
2 minutes
1 pt
The ability of some materials to attract certain metals is called
Electricity
Magnetism
Electromagnetism
Atoms
65. Multiple Choice
2 minutes
1 pt
What is an atom made of?
Three different types of particles: electrons, protons and neutrons.
Three different types of particles: electrons, protons and nanotrons.
Three different types of particles: electrons, molecules and oxygen.