Materials and Construction

371. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability?

1. Lead
2. Copper
3. Aluminium
4. Wrought iron

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372. The material of construction of bearings is

1. Cast iron
2. Babbitt metal
3. Pig iron
4. Steel

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373. The material of construction of pressure mills used for squeezing out the juice from sugar cane is

1. Stainless steel
2. Cast iron
3. Mild steel
4. Monel

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374. The material used in the filament of electric bulbs is

1. Nichrome
2. Tungsten
3. Constantan
4. German silver

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375. The maximum percentage of chromium that can be added to steel is about

1. 12
2. 18
3. 24
4. 30

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376. The metals occuring at the lower most position in the electromotive series

1. Do not resist corrosion
2. Resist corrosion very strongly
3. Are very brittle
4. Are heat insulators

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377. The most commonly used resin for making reinforced plastic is

1. Unsaturated polyester
2. Polypropylene
3. Polyurethane
4. Nylon-6

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378. The most distinguished property of malleable cast iron is its high

1. Ductility
2. Hardness
3. Malleability
4. None of these

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379. The most resistant material to alkaline corrosion is

1. Duriron
2. Nickel
3. Aluminium
4. Karbate

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380. The phenomenon in which slow extension of material takes place with the time at constant load is called

1. Plasticity
2. Creep
3. Elasticity
4. Ductility

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