[{"id":15528,"question":"If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be","choices":[{"text":"1 s","value":"A"},{"text":"2 s","value":"B"},{"text":"3 s","value":"C"},{"text":"4 s","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15527,"question":"If the metal bob is a simple pendulum is replaced by a wooden bob, then its time period will","choices":[{"text":"Increase","value":"A"},{"text":"Decreases","value":"B"},{"text":"Remain the same","value":"C"},{"text":"First 'A' then 'B'","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15526,"question":"In which case dose the potential energy decreases?","choices":[{"text":"On compressing a spring","value":"A"},{"text":"On stretching s spring","value":"B"},{"text":"One moving a body against gravitational force","value":"C"},{"text":"One the rising of an air bubble in water","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15525,"question":"Which one of the following is a simple harmonic motion?","choices":[{"text":"Wave moving through a string fixed at both ends.","value":"A"},{"text":"Earth spinning about its own axis","value":"B"},{"text":"Ball bouncing between two rigid vertical walls","value":"C"},{"text":"Particle moving in a circle with uniform speed.","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15524,"question":"Blood has a density","choices":[{"text":"Equal to water","value":"A"},{"text":"Greater then water","value":"B"},{"text":"Lesser then water","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15523,"question":"The smooth or steady stream-line flow is know as","choices":[{"text":"Laminar flow","value":"A"},{"text":"Turbulent flow","value":"B"},{"text":"Both a and b","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15522,"question":"According to Stoke's law drag force depends on","choices":[{"text":"Initial velocity","value":"A"},{"text":"Final velocity","value":"B"},{"text":"Terminal velocity","value":"C"},{"text":"Instantaneous velocity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15521,"question":"With the increase of temperature viscosity","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Remains same","value":"C"},{"text":"Doubles","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15520,"question":"Ball pen function on the principle of","choices":[{"text":"Viscosity","value":"A"},{"text":"Boyle's law","value":"B"},{"text":"Gravitational force","value":"C"},{"text":"Surface tension","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15519,"question":"A person standing near the track of  a fast moving train has tendency to fall towards it because of","choices":[{"text":"Vibration due to motion of train","value":"A"},{"text":"Gravitation force of attraction between person and trains","value":"B"},{"text":"The high speed of train","value":"C"},{"text":"Some other effect","value":"D"},{"value":"E"}],"correctAnswer":3}]