[{"id":121938,"question":"Rocket engines lift a rocket from the earth surface, because hot gas with high velocity","choices":[{"text":"Push against the air","value":"A"},{"text":"React against the rocket and push it up","value":"B"},{"text":"Heat up the air which lifts the rocket","value":"C"},{"text":"Push against the earth","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121934,"question":"Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same","choices":[{"text":"Momentum","value":"A"},{"text":"Kinetic energy","value":"B"},{"text":"Velocity","value":"C"},{"text":"Total energy","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121932,"question":"When the surfaces are coated with a lubricant, then they","choices":[{"text":"Stick to each other","value":"A"},{"text":"Slide upon each other","value":"B"},{"text":"Roll upon each other","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121929,"question":"A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is","choices":[{"text":"0.15 x 10<sup>-3</sup>Ns","value":"A"},{"text":"0.98 x 10<sup>-3</sup>Ns","value":"B"},{"text":"1.5 x 10<sup>-3</sup>Ns","value":"C"},{"text":"2.5 x 10<sup>-3</sup>Ns","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121927,"question":"Unit of impulse in","choices":[{"text":"Newton","value":"A"},{"text":"Kg m","value":"B"},{"text":"Kg m/s","value":"C"},{"text":"Joule","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121926,"question":"A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards?","choices":[{"text":"0.1 m/s","value":"A"},{"text":"10 m/s","value":"B"},{"text":"1 m/s","value":"C"},{"text":"0.01 m/s","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":121924,"question":"A cold soft drink is kept on the balance. When the cap is opened, then the weight","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"First increases, then decreases","value":"C"},{"text":"Remains same","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121922,"question":"When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts","choices":[{"text":"In the backward direction on the front wheel and in the forward direction on the rear wheel","value":"A"},{"text":"In the forwards directions on the front wheel and in the backward direction on the rear wheel","value":"B"},{"text":"In the forward direction on both the wheels","value":"C"},{"text":"In the backward direction on both the wheels","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121918,"question":"An aircraft is moving with a velocity of 300 ms<sup>-1</sup>. If all the forces acting on it are balanced, then","choices":[{"text":"It still moves with the same velocity","value":"A"},{"text":"It will be just floating at the same point in space","value":"B"},{"text":"It will be fall down instantaneously","value":"C"},{"text":"It will lose its velocity gradually","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121917,"question":"A boat of mass 40 kg is at rest, A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. What is the velocity of boat?","choices":[{"text":"4 m/s","value":"A"},{"text":"2 m/s","value":"B"},{"text":"8 m/s","value":"C"},{"text":"1 m/s","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121914,"question":"For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increases to","choices":[{"text":"Four times","value":"A"},{"text":"Thrice","value":"B"},{"text":"Once","value":"C"},{"text":"Twice","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121912,"question":"Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?","choices":[{"text":"The faster one","value":"A"},{"text":"Depends on their mass","value":"B"},{"text":"The slower one","value":"C"},{"text":"Both will reach simultaneously","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":121910,"question":"A the top of the trajectory of a projectile, the directions of its velocity and acceleration are","choices":[{"text":"Perpendicular to each other","value":"A"},{"text":"Parallel to each other","value":"B"},{"text":"Inclined to each other at an angle of 45<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">°</span>","value":"C"},{"text":"Anitparallel to each other","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":121903,"question":"Angular momentum","choices":[{"text":"Scalar","value":"A"},{"text":"Axial vector","value":"B"},{"text":"Polar vector","value":"C"},{"text":"At 45<span style=\"color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;\">° angle</span>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":121902,"question":"A stone is dropped from rest from the top of a tower 19.6 m high. The distance traveled during the last second of its fall is (giving g=9.8 m/s<sup>s</sup>)","choices":[{"text":"9.8 m","value":"A"},{"text":"14.7 m","value":"B"},{"text":"4.9 m","value":"C"},{"text":"19.6 m","value":"D"},{"value":"E"}],"correctAnswer":2}]