[{"id":15518,"question":"Surface tension of water is due to","choices":[{"text":"Inter molecular attraction","value":"A"},{"text":"Intermolecular spaces","value":"B"},{"text":"Inter molecular repulsion","value":"C"},{"text":"None of above","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15517,"question":"Bernoulli's equation is based upon law of conservation","choices":[{"text":"Mass","value":"A"},{"text":"Momentum","value":"B"},{"text":"Energy","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15516,"question":"The terminal velocity of a small size spherical body of radius R moving in a fluid varies as","choices":[{"text":"R","value":"A"},{"text":"R<sup>2</sup>","value":"B"},{"text":"1/R","value":"C"},{"text":"(1/R)<sup>2</sup><br>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15515,"question":"The velocity of falling raindrops attains limited value because of","choices":[{"text":"Up thrust of air","value":"A"},{"text":"VIscous force exerted by air","value":"B"},{"text":"Surface tension effect","value":"C"},{"text":"Air currents atmosphere","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15514,"question":"A person standing on a rotating platform has his hands lowered He suddenly outstretches his arms.The angular momentum","choices":[{"text":"Becomes zero","value":"A"},{"text":"Increases","value":"B"},{"text":"Decreases","value":"C"},{"text":"Remains the same","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15513,"question":"What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?","choices":[{"text":"12","value":"A"},{"text":"6","value":"B"},{"text":"3","value":"C"},{"text":"2","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15512,"question":"In which case application of angular velocity is useful?","choices":[{"text":"When a body is rotating","value":"A"},{"text":"When velocity of body is in a straight line","value":"B"},{"text":"When velocity is in a straight line","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15511,"question":"A couple produces","choices":[{"text":"Purely linear motion","value":"A"},{"text":"Purely rotational motion","value":"B"},{"text":"Linear and rotational motion","value":"C"},{"text":"No motion","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15510,"question":"Center of mass is a point","choices":[{"text":"Which is geometric center of a body","value":"A"},{"text":"From which distance of particles are same","value":"B"},{"text":"Where the whole mass of the body is supposed to be centered","value":"C"},{"text":"Which is the origin of reference frame","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15509,"question":"If the earth were to rotate faster than its present speed the weight of an object will","choices":[{"text":"Increase at the equator but remain unchanged at the poles","value":"A"},{"text":"Decrease at the equator but remain unchanged at the poles","value":"B"},{"text":"Remain unchanged at the decrease but decrease at the poles","value":"C"},{"text":"Remain unchanged at the equator but increase at the poles","value":"D"},{"value":"E"}],"correctAnswer":2}]