Assessment: (Post-Test)
Directions: Choose the best answer. Write the letter of the correct
answer on the blank
1
electromagnet decreases it strength.
Which statement is true?
A All electromagnets are permanent magnets.
B. Increasing the number of coils in an
C. Increasing the batteries increases its strength
D Both A and B.
Which can increase the strength of an electromagnet?
2.
A. increasing the number of coils around the nail
B. increasing the number of batteries
C making the core bigger
D. all of the above
Which of the electromagnets would have the greatest magnetic field?
3.
A
B.
C.
D.
Photo Credit: Hebron, Rea Marie H., Science for Active Minds p. 270
Which of the following is NOT part of an electromagnet?
B. core
C. battery
D. needles
A. wire
5.
A magnet that works only when there is a flow of electricity
A. Electromagnet
B. Bar Magnet
C. Horse Shoe Magnet
D. Magnetite
6
Which appliance does NOT use electromagnet?
A telephone B. television C. radio
D. broom
7
Which is NOT made of electromagnet?
A. cooking pan B. transformer C. generator
D. motor
8. Which of these forces can be used in a motor?
A magnetism B. wind
C. friction
D. gravity
9. Electromagnets are
A. permanent B. instant
C. temporary
D. stable
10.
Which makes an electromagnet work?
A needle
B. electricity
C. pin
D. thumbtacks
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Answer:
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