7. Why is parallel circuit used at homes, school and offices? *
1 point
A. It is inexpensive
B. It is convenient to use
C. It is environmentally friendly
D. It will not affect the other device
Study the pictures below. (Nos. 8-10).8.What kind of circuit is shown below? in I and II *
1 point
Captionless Image
A. Open Circuit
B. Closed Circuit
C. Series Circuit
D. Parallel Circuit
9. Which circuit can make light bulbs turn on brighter? *
1 point
A. I
B. II
C. III
D. IV
10. Which circuit will make light bulb shine with same brightness? *
1 point
A. I
B. II
C. III
D. IV
11.What is the force of attraction by a magnet to an object? *
1 point
A Circuit
B. Electricity
C. Magnetism
D. Magnetic Pole
12. Which statement is TRUE about a magnetic field? *
1 point
A. Channel for current to flow from the source to the load.
B. Increase the strength of magnetic attraction in an object.
C. Region around a magnet that exerts a magnetic force.
D. Producer of electricity and magnet to make the object move.
13.What is the word for the flow of electric current? *
1 point
A. Electricity
B. Electrodes
C. Electronic
D. Electron
14. Which electrical charge in a circuit flow back and forth? *
1 point
A. Alternating Current
B. Current Electricty
C. Direct Current
D. Electric Current
15.Which is NOT needed in making an electromagnet? *
1 point
A. Core
B. Electricity
C. Magnet
D. Wire
16. Which device makes use of electromagnets? *
1 point
A. Flashlight
B. Gas
C. Karaoke
D. Magnet
17. How can you describe an electromagnet? *
1 point
A. It is a semi-permanent magnet with battery, iron nails and wire.
B. It is a permanent magnet with battery, iron nails and wire.
C. It is a temporary magnet with battery, iron nails and wire.
D. It is a strong magnet with battery, iron nails and wire.
18. Which of these are needed to produce an electromagnet? *
1 point
A. Electricity and Sound
B. Electricity and Magnetism
C. Light and Heat
D. Sound and Heat
19. What is needed to increase the strength of an electromagnet? *
1 point
A. Increase the size of the iron core.
B. Increase the number of turns in the coil.
C. Increase the amount of electricity in the circuit
D. Increase the amount of electricity in the magnet.
20. Why is electromagnet preferred to use than a permanent magnet? *
1 point
A. Electromagnets produce electricity.
B. Permanent magnets are not strong.
C. The strength of electromagnets can be changed.
D. The strength of electromagnets is fixed.
21.Which of these materials works like a magnet? *
1 point
A. Dry cell
B. Iron Nail
C. Paper Clip
D. Wire
22. What happens when electromagnet is made stronger *
1 point
A. Increases the current in the coils
B. Makes the iron core the same
C. Increases the number of coils in the wire
D. Increases the attraction of metal objects
23. What happens when a battery in the electromagnet is lost? *
1 point
A. Decreases the current in the coils
B. Attraction of the object remains the same
C. Increases the attraction of metal objects
D. Decreases the attraction of metal objects
24. Which makes the force of an electromagnet stronger? *
1 point
A. Bigger iron nail
B. Less battery
C. Less coils of wire
D. More bar magnets
25. What is the iron nail preferable to use in electromagnet? *
1 point
A. The iron nail increases the strength in an electromagnet.
B. The iron nail decreases the strength in an electromagnet.
C. The soft iron core increases the strength in an electromagnet.
D. The soft iron core decreases the strength in an electromagnet.
26.Why is wire coiled in electromagnet? *
1 point
A. It gives more force.
B. It makes the electromagnet stronger.
C. It controls the field of attraction.
D. It controls the flow of electricity.
27. What makes electromagnet stronger than it used to be?I. Adding more dry cellsII. Using a core with a bigger diameterIII. Increasing the number of coilsIV. Using iron fillings instead of paper clips *
1 point
A I and III only
B. II and III only
C. III and IV only
D. I, II and III
Other:
28.Which of these devices uses electromagnet?I. Electric bell III. TelephoneII. Electric buzzer IV. Electric fan *
1 point
A. I and II only
B. II and IV
C. I, II and III
D. I, II, III and IV
Other:
29. Which of these is NOT a part of an electromagnet? *
1 point
A. Coil of wire
B. Nail as the core
C. Dry cell
D. Clips and iron fillings
30. What happens when a battery is detached from an electromagnet? *
1 point
A. It loses its magnetism.
B. Electricity continues to flow.
C. The electromagnet becomes a more permanent one.
D. It attracts more metals.





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