[{"id":111238,"question":"If a material object moves with the speed of light 'C' its mass becomes","choices":[{"text":"Equal to its rest mass","value":"A"},{"text":"Four times of its rest mass","value":"B"},{"text":"Double of its rest mass","value":"C"},{"text":"Infinite","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111237,"question":"Which one of the following physical quantities changes with relativistic speed","choices":[{"text":"Length","value":"A"},{"text":"Mass","value":"B"},{"text":"Time","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":111236,"question":"According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body","choices":[{"text":"Remains constant","value":"A"},{"text":"Decreases","value":"B"},{"text":"Increases to infinity","value":"C"},{"text":"Reduced to zero","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111235,"question":"A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is","choices":[{"text":"1.66 m","value":"A"},{"text":"1.0 m","value":"B"},{"text":"0.66 m","value":"C"},{"text":"2.66 m","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111234,"question":"If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers","choices":[{"text":"larger","value":"A"},{"text":"shorter","value":"B"},{"text":"equal","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111233,"question":"According to Einstein, with the great increase in the speed of the body the relativistic length of the body","choices":[{"text":"Remains constant","value":"A"},{"text":"Decreases","value":"B"},{"text":"Increases","value":"C"},{"text":"Reduces to zero","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111232,"question":"The length contraction happens only","choices":[{"text":"Opposite to the direction of motion","value":"A"},{"text":"along the direction of motion","value":"B"},{"text":"perpendicular to the direction of motion","value":"C"},{"text":"In any direction","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111231,"question":"The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum","choices":[{"text":"2.9 s","value":"A"},{"text":"3.0 s","value":"B"},{"text":"6.6 s","value":"C"},{"text":"9.6 s","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111230,"question":"According to the special theory of relativity, time is","choices":[{"text":"absolute quantity","value":"A"},{"text":"not absolute quantity","value":"B"},{"text":"constant quantity","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111229,"question":"The special theory of relativity is based on the","choices":[{"text":"one postulate","value":"A"},{"text":"two postulates","value":"B"},{"text":"three postulates","value":"C"},{"text":"four postulates","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111228,"question":"The general theory of relativity treats problems involving","choices":[{"text":"inertial frame of references","value":"A"},{"text":"accelerating frame of references","value":"B"},{"text":"both of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111227,"question":"The special theory of relativity treats problems invoving","choices":[{"text":"inertial frame of references","value":"A"},{"text":"accelerating frame of references","value":"B"},{"text":"both of these","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111226,"question":"A non-inertial frame of reference is one, in which","choices":[{"text":"law of inertial is valid","value":"A"},{"text":"all laws of physics are the same in all frames","value":"B"},{"text":"a>0 or a<0","value":"C"},{"text":"a=0","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111225,"question":"An inertial frame is that frame in which","choices":[{"text":"a>0","value":"A"},{"text":"a=0","value":"B"},{"text":"a<0","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111224,"question":"Which of the following is not an example of intertial frame","choices":[{"text":"a body placed on the surface of earth","value":"A"},{"text":"a body placed in a car moving with uniform velocity","value":"B"},{"text":"a body placed in a car moving with same acceleration","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111223,"question":"An intertial frame of reference is a frame of reference which is","choices":[{"text":"at rest","value":"A"},{"text":"moving with uniform velocity","value":"B"},{"text":"either at rest or moving with uniform velocity","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111222,"question":"Absolute motion cannot be detected","choices":[{"text":"in its own frame of references","value":"A"},{"text":"in a different frame of references","value":"B"},{"text":"both in its frame and different frame of references","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111221,"question":"The concept of direction and position are purely","choices":[{"text":"absolute","value":"A"},{"text":"relative","value":"B"},{"text":"absolute or relative","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2}]