Physics Practice: Magnetism (Mock Test 4 - Expert)
1. In an expert laboratory experiment, a student finds that a magnet loses its strength when cooled to absolute zero. This is a common misconception. In reality, cooling a magnet usually:
2. Which expert method is used to demagnetize a permanent magnet completely?
3. The magnetic length of a bar magnet is approximately ________ times its geometric length.
4. "Magnetic Shielding" is an expert technique where sensitive instruments are protected from external magnetic fields by placing them inside a box made of:
5. If a magnet is broken into 100 small pieces, the total number of magnetic poles will be:
6. A magnetic material is said to be "Saturated" when:
7. The "Curie Point" is the specific temperature above which:
8. Which of the following describes the Earth's "Magnetic Declination"?
9. "Consequent Poles" are produced in a magnetic bar when:
10. Why is the core of a transformer made of laminated soft iron?
11. A magnetic field is strongest where the field lines are:
12. Maglev trains use the expert principle of ________ to float above the tracks.
13. Which of the following is an example of an expert use of electromagnets?
14. If a bar magnet is placed in a uniform magnetic field, it experiences:
15. "Retentivity" of a material refers to its ability to:
16. The SI unit of magnetic flux is:
17. An expert way to identify the North pole of an unmarked magnet without using another magnet is:
18. Permanent magnets are often made from "Alnico" because it has:
19. Magnetic field lines are ________ curves.
20. The magnetic field of the Earth is thought to be caused by:
