[{"id":161561,"question":"During the upward motion of the projectile, the vertical component of velocity.","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains constant","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":161560,"question":"If m means mass of gases objected per second from a rocket and v shows the change in velocity, than mv is named as:","choices":[{"text":"Force","value":"A"},{"text":"Energy","value":"B"},{"text":"work","value":"C"},{"text":"impulse","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":161559,"question":"Change in momentum is one second called.","choices":[{"text":"Impulse","value":"A"},{"text":"Force","value":"B"},{"text":"Energy","value":"C"},{"text":"Work","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":161558,"question":"The collision in which KE is conserved but momentum is not conserved is called:","choices":[{"text":"Elastic collision","value":"A"},{"text":"Inelastic collision","value":"B"},{"text":"any these","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":161557,"question":"When the mass of the colliding body is much larger than the mass of the body at rest, its velocity after collision.","choices":[{"text":"Becomes half","value":"A"},{"text":"Becomes zero","value":"B"},{"text":"Ramains same","value":"C"},{"text":"Becomes double","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":161556,"question":"If two bodies of equal masses moving in the same direction collide elastically, then their velocities.","choices":[{"text":"Are added","value":"A"},{"text":"Are subtracted","value":"B"},{"text":"Do not change","value":"C"},{"text":"Are exchanged","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":161555,"question":"Acceleration in a body is always produced in the directin of:","choices":[{"text":"Velocity","value":"A"},{"text":"Weight","value":"B"},{"text":"Force","value":"C"},{"text":"Botha B and C","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":161554,"question":"A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:","choices":[{"text":"20 minutes","value":"A"},{"text":"48 minutes","value":"B"},{"text":"10 minutes","value":"C"},{"text":"5 minutes","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":161552,"question":"The path followed by the projectile is known as:","choices":[{"text":"Cycle","value":"A"},{"text":"Hyperbola","value":"B"},{"text":"Trajectory","value":"C"},{"text":"Route","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":161551,"question":"During the upward motion of the projectile, the vertical component of velocity:","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains constant","value":"C"},{"text":"None of 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be:","choices":[{"text":"4.9 m","value":"A"},{"text":"9.8 m","value":"B"},{"text":"19.6 m","value":"C"},{"text":"29.4 m","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":161542,"question":"When the total displacement is divided by total time taken, we get:","choices":[{"text":"Velocity","value":"A"},{"text":"Average speed","value":"B"},{"text":"Average velocity","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":161541,"question":"The decrease in velocity per unit time is called:","choices":[{"text":"Variable Acceleration","value":"A"},{"text":"Average Acceleration","value":"B"},{"text":"Retardation","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":161540,"question":"The distance covered by a body in unit time is called.","choices":[{"text":"Displacement","value":"A"},{"text":"speed","value":"B"},{"text":"Velocity","value":"C"},{"text":"Both B and C","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":158943,"question":"Three quarks make:","choices":[{"text":"An electron","value":"A"},{"text":"A meson","value":"B"},{"text":"A baryon","value":"C"},{"text":"A photon","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158942,"question":"A pair of quark and antiquark makes a:","choices":[{"text":"Meson","value":"A"},{"text":"Baryon","value":"B"},{"text":"Proton","value":"C"},{"text":"Neutron","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":158941,"question":"Which are not the elementary particles?","choices":[{"text":"Photons","value":"A"},{"text":"Leptons","value":"B"},{"text":"Hadrons","value":"C"},{"text":"Quarks","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":158940,"question":"U-238 present in the natural uranium is about:","choices":[{"text":"59%","value":"A"},{"text":"0.007%","value":"B"},{"text":"99%","value":"C"},{"text":"39%","value":"D"},{"text":"19%","value":"E"}],"correctAnswer":3},{"id":158939,"question":"Heavy water is made of one oxygen atom and two atoms of:","choices":[{"text":"Protium","value":"A"},{"text":"Deuterium","value":"B"},{"text":"Tritium","value":"C"},{"text":"Any of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":158938,"question":"Examples of moderators used in a fission reactor is/are:","choices":[{"text":"Water","value":"A"},{"text":"Heavy water","value":"B"},{"text":"Carbon","value":"C"},{"text":"Hydrocarbon","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":158937,"question":"There is present in paraffin a large amount of:","choices":[{"text":"Nitrogen","value":"A"},{"text":"Hydrogen","value":"B"},{"text":"Carbon","value":"C"},{"text":"Baryllium","value":"D"},{"text":"Lithium","value":"E"}],"correctAnswer":2},{"id":158936,"question":"A mass difference of 0.0012 u is equivalent to and energy of:","choices":[{"text":"0.5 Me V","value":"A"},{"text":"1.13 MeV","value":"B"},{"text":"5.13 MeV","value":"C"},{"text":"1.13 keV","value":"D"},{"text":"1.13 eV","value":"E"}],"correctAnswer":2},{"id":158935,"question":"In his experiment on nuclear reactions, Rutherford bombardedα particles on:","choices":[{"text":"Nitrogen","value":"A"},{"text":"Hydrogen","value":"B"},{"text":"Lead","value":"C"},{"text":"Oxygen","value":"D"},{"text":"Krypton","value":"E"}],"correctAnswer":1}]