[{"id":127450,"question":"Substances which undergo plastic deformation until they break, are known as","choices":[{"text":"brittle substances","value":"A"},{"text":"ductile substances","value":"B"},{"text":"plastic substances","value":"C"},{"text":"neither of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":127449,"question":"The maximum stress that a material can withstand is known as","choices":[{"text":"plastic point","value":"A"},{"text":"elastic point","value":"B"},{"text":"yield point","value":"C"},{"text":"ultimate tensile strength","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":127448,"question":"When the deformation produced in the material becomes permanent, this type of behaviour is called","choices":[{"text":"proportionality","value":"A"},{"text":"elasticity","value":"B"},{"text":"plasticity","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":127447,"question":"Under the elastic region, the deformation produced in the material is","choices":[{"text":"permanent","value":"A"},{"text":"temporary","value":"B"},{"text":"either of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":127443,"question":"In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as","choices":[{"text":"plastic limit","value":"A"},{"text":"plastic deformation","value":"B"},{"text":"proportional limit","value":"C"},{"text":"elastic behaviour","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":127441,"question":"The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are","choices":[{"text":"5","value":"A"},{"text":"7","value":"B"},{"text":"9","value":"C"},{"text":"14","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":127435,"question":"When the shear stress and shear strain are involved, then their ratio is called","choices":[{"text":"Young's 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the stress to the strain is a constant value for","choices":[{"text":"different material","value":"A"},{"text":"all material","value":"B"},{"text":"a given material","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":127422,"question":"The SI unit of strain is","choices":[{"text":"N","value":"A"},{"text":"dynes","value":"B"},{"text":"pascal","value":"C"},{"text":"dimensionless","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":127420,"question":"The measure of the deformation in a solid when stress in applied to it is called","choices":[{"text":"elastic constant","value":"A"},{"text":"Young's modulus","value":"B"},{"text":"strain","value":"C"},{"text":"elasticity","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":127419,"question":"When a stress changes the shape, it is called the","choices":[{"text":"compressional stress","value":"A"},{"text":"tensile stress","value":"B"},{"text":"shear stress","value":"C"},{"text":"any one of 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is","choices":[{"text":"rectangular","value":"A"},{"text":"hexagonal","value":"B"},{"text":"tetrahedral","value":"C"},{"text":"cubical","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":127405,"question":"The smallest three dimensional basic structure in a crystalline solid is called","choices":[{"text":"lattice point","value":"A"},{"text":"crystal lattice","value":"B"},{"text":"cubic crystal","value":"C"},{"text":"unit cell","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":127403,"question":"polymeric solids have","choices":[{"text":"low specific gravity","value":"A"},{"text":"high specific gravity","value":"B"},{"text":"either of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":127402,"question":"Synthetic materials fall into the category of","choices":[{"text":"crystalline solids","value":"A"},{"text":"amorphous","value":"B"},{"text":"polymeric solids","value":"C"},{"text":"all of 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constant?","choices":[{"text":"amplitude of oscillations","value":"A"},{"text":"temperature of solid","value":"B"},{"text":"average atomic positions","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":127389,"question":"The amplitude of oscillation of each atom in a metallic crystal rises with the","choices":[{"text":"rise in temperature","value":"A"},{"text":"decrease in temperature","value":"B"},{"text":"even temperature remains constant","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":127387,"question":"The molecules or ions in a crystalline solid are","choices":[{"text":"static","value":"A"},{"text":"not static","value":"B"},{"text":"randomly moving","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":127385,"question":"The solids which have structure in between order and disorder are called","choices":[{"text":"amorphous solids","value":"A"},{"text":"polymeric 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is","choices":[{"text":"1","value":"A"},{"text":"1.55","value":"B"},{"text":"1.52","value":"C"},{"text":"1.43","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":126389,"question":"Multimode step index fibre is useful for","choices":[{"text":"short distance","value":"A"},{"text":"long distance","value":"B"},{"text":"both a and b","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1}]