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- 1. Multiple Choice
What will happen when these magnets are brought close together?They will attract each other.They will repel each other.Both magnets will turn to the leftBoth magnets will turn to the right - 2. Multiple ChoiceMagnets have a north and a south ___________shapecolorpoleregion
- 3. Multiple ChoiceWhere is the strongest attraction force of the magnet?at the polesin the middleabove the magnetbelow the magnet
- 4. Multiple ChoiceIron, Nickel and cobalt are all __________________ materialsShinypolesmagneticcold
- 5. Multiple ChoiceWhich of the following is true about a bar magnet?Its magnetic field is strongest near its center.It is surrounded by a magnetic field.The north pole is stronger than the south pole.The south pole is stronger than the north pole.
- 6. Multiple ChoiceHow is an electromagnet different from a permanent magnet?An electromagnet is smaller and less powerful.An electromagnet's magnetism can be turned off.An electromagnet can be built without using metal.An electromagnet does not attract objects containing iron.
- 7. Multiple ChoiceA simple electromagnet can be made with which of the following?an electric currenta turbine and naila nail, a wire, and a batterya compass and a battery
- 8. Multiple ChoiceHow can the strength of an electromagnet be increased?by rubbing it with a stronger magnetby increasing the coils of wire around the ironby increasing the length of the wire from the batteryby loosening the coil of wire around the iron
- 9. Multiple ChoiceWhich rule do we use to predict the direction a current carrying wire will move in a magnetic field?Fleming's Left Hand RuleFleming's Right Hand RuleFaraday's Left Hand RuleFaraday's Right Hand Rule
- 10. Multiple ChoiceIn Flemings Left hand rule what does the thumb point in the direction of?The direction of the magnetic fieldThe direction of the currentThe direction of the force (movement)None of these
- 11. Multiple ChoiceIn Flemings Left Hand Rule, in what direction does the second (middle) finger point? (The first finger is the one by your thumbThe direction of movementThe direction of the magnetic fieldThe direction of electrical currentThe direction of electron flow
- 12. Multiple ChoiceThe current in the green wire flows from the left to the right. What direction does the wire move?UpDownInto the pageOut of the page
- 13. Multiple ChoiceWhich of the following may be done to increase the force felt during the motor effect?Increase the current, length of wire in the field or the strength of the magneticIncrease the voltage, length of wire in the field or the strength of the magneticIncrease the current, increase the voltage or increase the strength of the magnetic fieldIncrease the resistance in the wire or increase the magnetic field strength
- 14. Multiple Choice
A __________ is an electrical device that converts AC electricity from one voltage level to another
transformer
primary coil
secondary coil
center tap
- 15. Multiple Choice
Which part (s) of the DC motor connect the power supply to the split-ring and coil?
Carbon brushes
Magnets
Commutator
Slip rings
- 16. Multiple Choice
Use Flemming's left-hand rule to work out which way coil AB will turn.
Downward
Upward
Into the paper
Out of the paper
- 17. Multiple Choice
Which rule is used to find the direction of magnetic field around a straight conductor
Flemming left hand rule
Lenz law
Flemmings right hand rule
Right hand thumb rule
- 18. Multiple Choice
In the picture shown, can you decide the direction of the current on wire MN?
Upward
Downward
Into the paper
Out of the paper
- 19. Multiple ChoiceElectrical energy passes through the overhead cables at approximately...25,000 V132 kV230 V
- 20. Multiple ChoiceElectrical energy enters the home at approximately...25,000 V132 kV230 V
- 21. Multiple ChoiceStep-up transformers...improve the efficiency of the national gridreduce the voltage to a safe level for the homeboth
- 22. Multiple ChoiceStep-down transformers...improve the efficiency of the national gridreduce the voltage to a safe level for the homeboth
- Answer choicesTagsAnswer choicesTags