Electricity and Magnetic Fundamentals

281. Which of the following is a diamagnetic material?

1. Aluminum
2. Silver
3. Air
4. Cobalt

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282. Which of the following is a natural magnet?

1. Steel
2. Magnesia
3. Lodestone
4. Soft iron

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283. Which of the following is a paramagnetic material?

1. Carbon
2. Copper
3. Bismuth
4. Oxygen

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284. Which of the following is a vector quantity?

1. Magnetic potential
2. Magnetic field intensity
3. Magnetic permeability
4. Flux density

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285. Which of the following is used by permanent magnets as the magnetic material?

1. iron
2. nickel
3. soft steel
4. hardened steel

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286. Which of the following is used by temporary magnets as the magnetic material?

1. Hardened steel
2. Cobalt steel
3. Soft iron
4. Tungsten steel

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287. Which of the following magnetic materials can be easily magnetized in both direction?

1. Soft magnetic materials
2. Hard magnetic materials
3. High hysteresis loss materials
4. Low hysteresis loss materials

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288. Which of the following materials has permeability slightly less than that of free space?

1. Paramagnetic
2. Non- magnetic
3. Ferromagnetic
4. Diamagnetic

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289. Which of the following materials has the highest dielectric strength?

1. Glass
2. Oiled paper
3. Mica
4. Air

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290. Which of the following materials has the least hysteresis loop area?

1. soft iron
2. silicon steel
3. hard steel
4. wrought iron

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