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- 1. Multiple Choice
Electrical work done per unit time is:electrical energy.electrical current.electrical power.electrical circuit. - 2. Multiple ChoiceElectric current is the flow of:electronsprotonsneutronsnone of these
- 3. Multiple ChoiceA 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 ChoiceAll wires used in electric circuits should be covered with:a colored material.a conducting material.an insulating material.none of these.
- 5. Multiple ChoiceThe electric meters in our houses measure the electrical energy consumed in __________.circuitEarthkilowatt-hours3.6 x 106
- 6. Multiple ChoiceOne kilowatt-hour is equivalent to __________ joules.kilowatt-hour3.6 x 106rednone of these
- 7. Multiple ChoiceThe flow of charge per unit time through a conductor is called __________.circuitkilowatt-houroverloadingelectric current
- 8. Multiple ChoiceThe level of charge per unit time on a body is called __________ of the body.overloadingpotential differenceleclancheGermanium
- 9. Multiple ChoiceElectricity moves only in a __________ circuit.circuitdifference in potentialclosedopen
- 10. Multiple ChoiceHomes are wired in __________.series circuitparallel circuitkilowatt-hournegative, positive
- 11. Multiple ChoiceWhen we turn the switch to the off position the circuit is __________.closedopennegative, positiveoverload
- 12. Multiple ChoiceWhen you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in __________.parallelseriesopenclosed
- 13. Multiple ChoiceWhen you attach a wire to both terminals of a dry cell, the electrons flow from the __________ terminal to the __________ terminal.negative, positivepositive, negativenegative, neutralneutral, positive
- 14. Multiple ChoiceThe source of electric current for a hand-held transistor radio is __________.cellconductormaterialcurrent
- 15. Multiple ChoiceElectricity used in homes is generated in __________.power plantdynamocellconductor
- 16. Multiple ChoiceA closed circuit has its every part made of __________.electric currentconducting materialdynamocell
- 17. Multiple ChoiceWe should switch off the main switch if a person accidentally touches a live wire.TrueFalse
- 18. Multiple ChoiceA large number of electrical appliances connected in a circuit can be operated together.TrueFalse
- 19. Multiple ChoiceA large number of electrical appliances connected in a circuit can not be operated together.TrueFalse
- 20. Multiple ChoiceElectrical 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 ChoicePure water is a good conductor of electricity.TrueFalse
- 22. Multiple ChoiceWhen a circuit is closed the electric current does not flow through it.TrueFalse
- 23. Multiple ChoiceA bulb is the source of electricity in a flashlight.True.False.
- 24. Multiple ChoiceGlass is a good conductor.TrueFalse
- 25. Multiple ChoiceA bicycle works by electricity.TrueFalse
- 26. Multiple ChoiceCurrent carrying wires must be insulated because it is dangerous to anyone to touch current carrying wires if they are not insulated.TrueFalse
- 27. Multiple ChoiceWhich circuit will light up?A, BB, CC, DD, F
- 28. Multiple ChoiceThe 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 ChoiceThree 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 ChoiceA 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=VIt28800 J or 28.8 KJ600 s4.55 A120 V - 31. Multiple ChoiceWhat 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/V4.55 A28800 J or 28.8 KJ80 W200 W - 32. Multiple ChoiceA current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
Remember: I=P/V80 W200 W2.5 A4.55 A - 33. Multiple ChoiceCalculate 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=VI80 W200 W2.5 A22.5 KJ - 34. Multiple ChoiceCalculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
Remember: I=V/R and P=VI200 W80 W2.5 A79.20 KJ - 35. Multiple ChoiceCalculate 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/R80 W200 W22500 J or 22.5 KJ4500 J or 4.5 KJ - 36. Multiple ChoiceA 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 = Pt22500 J or 22.5 KJ4500 J or 4.5 KJ79.2 W2.5 A - 37. Multiple ChoiceDoes this statement best describe a parallel or a series circuit.
Different voltages are dropped across each resistor.Parallel circuitSeries circuit - 38. Multiple ChoiceDoes this statement best describe a parallel or a series circuit.
Different currents flow through each resistor.Parallel circuitSeries circuit - 39. Multiple ChoiceDoes this statement best describe a parallel or a series circuit.
If one part of the circuit fails, the other parts still work.Parallel circuitSeries circuit - 40. Multiple ChoiceDoes this statement best describe a parallel or a series circuit.
The total resistance is equal to the sum of the individual resistances.Parallel circuitSeries circuit - 41. Multiple ChoiceA 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 A1.00 A1.00 V0.500 W
- 42. Multiple ChoiceProtons and electrons...repel each other.attract each other.have no effect on each other.
- 43. Multiple ChoiceWhen switch is turned on the circuit is?OpenClosed
- 44. Multiple ChoiceOpposites ___________repelattractstickmove
- 45. Multiple ChoiceWhen switch is turned off the circuit is?OpenClosed
- 46. Multiple ChoiceWhat is a Switch?A device used to control to flow of electricitySomething that turns on lightsImbalance of chargesA path that electricity flows through
- 47. Multiple ChoiceIs this circuit open or closed?ClosedOpen
- 48. Multiple ChoiceWhat is a Circuit?LightningStatic ElectricityThe path that electricity flows throughElectrons flowing
- 49. Multiple ChoiceWhich is not a Conductor?FoilPennyIronRubber
- 50. Multiple ChoiceWhat is a Conductor?a material that easily allows electricity to flow through ita material that does not allow electricity to flow easily
- 51. Multiple ChoiceWhat is an Insulator?a material that easily allows electricity to flow through ita material that does not allow electricity to flow easily
- 52. Multiple ChoiceWhich is the Source?BatteryWireLight BulbSwitch
- 53. Multiple ChoiceSame charges __________repelattractstickcome together
- 54. Multiple ChoiceWhat do magnets stick to?copperwoodironplastic
- 55. Multiple ChoiceMagnetism is a type of ____________forcebookplantanimal
- 56. Multiple ChoiceWhen two magnets attract, they ______________push apartchange colorget colderpull together
- 57. Multiple ChoiceWhen two magnets repel, they ________________change colorpull togetherpush apartget colder
- 58. Multiple ChoiceThe force of magnetism can go through many materials.TrueFalse
- 59. Multiple ChoiceMagnets have a north and a south ___________shapecolorpoleregion
- 60. Multiple ChoiceTwo north poles will attract.TrueFalse
- 61. Multiple ChoiceA north pole and a south pole will attract.TrueFalse
- 62. Multiple ChoiceWhat would we call a nail that can pick up a paperclip because it is touching a magnet?temporary magnetpolesforcedetector
- 63. Multiple ChoiceThe force of magnetism is stronger when magnets are ________________coldroundcloser togetherfarther apart
- 64. Multiple ChoiceThe ability of some materials to attract certain metals is calledElectricityMagnetismElectromagnetismAtoms
- 65. Multiple ChoiceWhat 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.
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