[{"id":110693,"question":"When a stress changes length, it is called the","choices":[{"text":"compressional stress","value":"A"},{"text":"tensile stress","value":"B"},{"text":"shear stress","value":"C"},{"text":"any one of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110690,"question":"The SI unit of stress is","choices":[{"text":"N/m<sup>2</sup>","value":"A"},{"text":"Nmc","value":"B"},{"text":"dynes/m","value":"C"},{"text":"N","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110689,"question":"The force applied on unit area to produce any change in the shape, volume or length of a body is known as","choices":[{"text":"strain","value":"A"},{"text":"elasticity","value":"B"},{"text":"stretching","value":"C"},{"text":"stress","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":110676,"question":"The results of mechanical tests are usually expressed in terms of","choices":[{"text":"stress","value":"A"},{"text":"strain","value":"B"},{"text":"stress and 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sans-serif;\">°</b>C","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110662,"question":"Glass is an example of","choices":[{"text":"crystalline solid","value":"A"},{"text":"amorphous solid","value":"B"},{"text":"polymeric solid","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110660,"question":"Amorphous solids are also called as","choices":[{"text":"crystalline solids","value":"A"},{"text":"polymeric solids","value":"B"},{"text":"glassy solids","value":"C"},{"text":"any one of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110659,"question":"Amorphous solids are also more like","choices":[{"text":"crystalline solids","value":"A"},{"text":"gases","value":"B"},{"text":"liquids","value":"C"},{"text":"any one of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110658,"question":"Every crystalline solid has","choices":[{"text":"definite melting point","value":"A"},{"text":"different melting 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structure in-between order and disorder are called","choices":[{"text":"amorphous solids","value":"A"},{"text":"polymeric solids","value":"B"},{"text":"crystalline solids","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110643,"question":"There is a regular arrangement of molecules in a","choices":[{"text":"amorphous solids","value":"A"},{"text":"polymeric solids","value":"B"},{"text":"crystalline solids","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":110637,"question":"If a freely oscillating system is subjected to an external force, then","choices":[{"text":"free vibrations will take place","value":"A"},{"text":"the body will move with its natural frequency","value":"B"},{"text":"forced vibrations will take place","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110634,"question":"The natural frequency of a pendulum which is vibrating freely, depends upon its","choices":[{"text":"mass","value":"A"},{"text":"length","value":"B"},{"text":"material","value":"C"},{"text":"all of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110631,"question":"The frequency of free vibrations is known as","choices":[{"text":"free frequency","value":"A"},{"text":"forced frequency","value":"B"},{"text":"natural frequency","value":"C"},{"text":"un-natural frequency","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110629,"question":"A body is executing free vibrations when it oscilates","choices":[{"text":"with the interference of an external force","value":"A"},{"text":"without the interference of an external force","value":"B"},{"text":"with the interference of an internal force","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110627,"question":"If a simple pendulum is shifted from karachi to K-2 cliff, its time period","choices":[{"text":"remains the same","value":"A"},{"text":"decreases","value":"B"},{"text":"increases","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":110625,"question":"The time period of pendulums of different lengths would be","choices":[{"text":"same","value":"A"},{"text":"different","value":"B"},{"text":"both of them","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110624,"question":"A second's pendulum is a pendulum whose time period is","choices":[{"text":"1 second","value":"A"},{"text":"2 seconds","value":"B"},{"text":"3 seconds","value":"C"},{"text":"4 seconds","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":110622,"question":"If the mass of the simple pendulum becomes double, its time period","choices":[{"text":"increase","value":"A"},{"text":"decreases","value":"B"},{"text":"remains constant","value":"C"},{"text":"none of them","value":"D"},{"value":"E"}],"correctAnswer":3}]