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Q 1/25
Score 0
1. A bar magnet is divided into two pieces. Which of the following statements is true about the force between the broken pieces if they face each other with a small separation?
120
There is a magnetic attractive force between the broken pieces.
There is an electric attractive force between the broken pieces.
There is a magnetic repulsive force between the broken pieces.
There is an electric repulsive force between the broken pieces.
Q 2/25
Score 0
2. Which statement about the magnetic force of a current carrying wire is FALSE?
120
It is exerted over a distance.
It acts only on materials that are touching a magnet.
It includes forces of attraction and repulsion.
It affects only certain types of matter.
25 questions
Q.
1. A bar magnet is divided into two pieces. Which of the following statements is true about the force between the broken pieces if they face each other with a small separation?
1
120 sec
Q.
2. Which statement about the magnetic force of a current carrying wire is FALSE?
2
120 sec
Q.
3. A bar magnet is divided in two pieces. Which of the following statement is true?
3
60 sec
Q.
4. What will happen to the direction of the compass needle if the current of the
current-carrying wire is reversed?
4
120 sec
Q.
5. How will the needle of the galvanometer deflect if the wire is moved downward from the magnetic field?
5
120 sec
Q.
6. What is referred to as the process of inducing a current in a changing magnetic field?
6
60 sec
Q.
7. Who was the scientist who discovered that changing magnetic field can also produce current?
7
60 sec
Q.
8. Which is NOT part of a simple DC motor?
8
60 sec
Q.
9. A magnet moves into a coil of wire inducing a current in the wire. If the magnet is pulled back out of the coil in the opposite direction as it went into the coil, which of the following will occur?
9
120 sec
Q.
10. A magnet moves into a coil of wire inducing a current in the wire. If the magnet remains stationary in the coil, which of the following will occur?
10
120 sec
Q.
11. Which device converts electrical energy into mechanical energy?
11
60 sec
Q.
12. Which is NOT a part of a DC generator?
12
60 sec
Q.
13. James Clerk Maxwell, a Scottish physicist is best known for combining the fields of electricity and magnetism to create a theory of the electromagnetic field. Among the tenets of his theory were the following except
13
120 sec
Q.
14. In which case or cases is electric field present?
I. A spark jumping between two nearby rods.
II. A charge that is momentarily at rest.
III. A rotating bar magnet.
14
120 sec
Q.
15. In which case can a magnetic field be produced?
15
60 sec
Q.
16. Which device can be used to determine the polarity of an unmarked magnet?
16
60 sec
Q.
17. Which statement about an electromagnet is TRUE?
17
60 sec
Q.
18. As part of a traffic light system, large loops of wire are buried beneath road intersections. Which of the statements is NOT TRUE about the operation of this traffic light system?
18
120 sec
Q.
19. Complete the following statement: Moving a metallic detector past a 5 peso coin creates a secondary magnetic field that is most similar to that of ____________.
19
120 sec
Q.
20. What basic principles enables ALL electric motors to operate?
20
120 sec
Q.
21. A magnet moves inside a coil. Consider the following factors:
I. strength of the magnet
II. number of turns in the coil
III. speed at which the magnet moves
Which can affect the electromotive force (emf) induced in the coil?
21
120 sec
Q.
22. What transformation can take place in an improvised generator?
22
60 sec
Q.
23. A loop of conductor lies flat on a horizontal table. A toy magnet is hanging still over it with the magnet’s north-seeking pole pointing down. What happens next?
23
120 sec
Q.
24. What transformation can take place in a ceiling fan’s electric motor?
24
60 sec
Q.
25. Which statement about an electromagnetic nail is NOT true?
