Materials and Construction

451. Which of the following is the easiest to bend?

1. Steel
2. Stainless steel
3. Cast iron
4. Wrought iron

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452. Which of the following is the hardest material?

1. Topaz
2. Quartz
3. Corundum
4. Fluorite

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453. Which of the following is the hardest?

1. Cementite
2. Pearlite
3. Austenite
4. Ferrite

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454. Which of the following is the lightest of engineering metals?

1. Magnesium
2. Aluminium
3. Titanium
4. Tin

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455. Which of the following is the most elastic material?

1. Plastic
2. Glass
3. Steel
4. Rubber

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456. Which of the following is the most prone to atmospheric corrosion?

1. Silver
2. Iron
3. Tin
4. Copper

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457. Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?

1. Cast iron
2. Steel
3. Nickel
4. Karbate

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458. Which of the following is the most widely used insulating material for steam carrying pipelines?

1. Ceramic fibre blanket
2. Glass wool and 85% magnesia
3. Vermiculite
4. Slag wool

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459. Which of the following is the softest material?

1. Quartz
2. Calcite
3. Corundum
4. Fluorite

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