Materials and Construction

61. Amount of energy that a material can absorb before its fracture is a measure of its

1. Toughness
2. Resilience
3. Malleability
4. Ductility

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62. An alloy of iron containing 4% carbon is called

1. High carbon steel
2. Wrought iron
3. Mild steel
4. None of these

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63. An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called

1. Constantan
2. Kanthal
3. Chromel
4. German silver

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64. An elastic behaviour of materials is expressed in terms of

1. Hysteresis loop area
2. Stress-strain curve
3. Relaxation time
4. None of these

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65. An ideal material of construction for the storage of 50% caustic soda solution would be

1. Karbate
2. High silicon cast iron
3. Monel
4. None of these

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66. Anodic material used for the cathodic protection of underground buried steel pipeline is

1. Nickel or copper
2. Zinc or magnesium
3. Bronze
4. Brass

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67. Approximate value of the modulus of elasticity for steel is about _________ × 106kg/cm2.

1. 0.5
2. 2
3. 40
4. 75

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68. Aqueous nitric acid is stored in

1. Steel drum
2. Stainless steel vessel
3. Cast iron vessel lined with acid-proof masonry brick
4. Cast iron vessel

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69. Aqueous nitric acid is stored in _________ vessel.

1. Plain carbon steel
2. Stainless steel
3. Cast iron
4. Thermosetting plastic material

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70. As the impurities are oxidised, the melting point of iron

1. Decreases
2. Remains unchanged
3. Increases
4. May increase or decrease; unpredictable

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