| 1. | Which of the following material has maximum ductility ? | |
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Mild steel
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Copper
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Nickel
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Aluminium
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Report Question| 2. | Manganese bronze has ? | |
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good wearing qualities and high elasticity
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high yield point, high fatigue limit and excellent cold and hot corrosion resistance
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high resistance to corrosion
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valuable cold working property
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| 3. | The malleability is the property of a material by virtue of which a material ? | |
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regains its shape and size after the removal of external forces
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retains the deformation produced under load permanently
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can be drawn into wires with the application of a tensile force
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can be rolled or hammered into thin sheets
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| 4. | Shock resisting steels should have ? | |
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low wear resistance
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low hardness
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low tensile strength
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toughness
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| 5. | In low carbon steels, presence of small quantities of sulphur improves ? | |
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weldability
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formability
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machinability
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hardenability
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| 6. | The iron ore mostly used for the production of pig iron is ? | |
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magnetite
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haematite
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limonite
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siderite
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| 7. | Sulphur in cast iron ? | |
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makes the iron soft and easily machinable
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increases hardness and brittleness
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makes the iron white and hard
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aids fusibility and fluidity
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| 8. | Killed steels ? | |
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have minimum impurity level
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are produced by L-D process
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have almost zero percentage of phosphorus and sulphur
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are free from oxygen
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| 9. | The hardness is the property of a material due to which it ? | |
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can be drawn into wires
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breaks with little permanent distortion
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can cut another metal
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can be rolled or hammered into thin sheets
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| 10. | Which of the following has a fine gold colour and is used for imitation jewellery ? | |
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Silicon bronze
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Aluminium bronze
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Gun metal
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Babbit metal
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