[{"id":119556,"question":"The voltage increases linearly with","choices":[{"text":"time","value":"A"},{"text":"velocity","value":"B"},{"text":"acceleration","value":"C"},{"text":"torque","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":119554,"question":"How many number of anodes used in electron gun","choices":[{"text":"one","value":"A"},{"text":"two","value":"B"},{"text":"three","value":"C"},{"text":"six","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111220,"question":"Electron gun consist of","choices":[{"text":"three anodes","value":"A"},{"text":"heating cathode","value":"B"},{"text":"three anodes","value":"C"},{"text":"three anodes , heating cathode, grid","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111219,"question":"A beam of electrons is provided by an","choices":[{"text":"electron gun","value":"A"},{"text":"Suppray","value":"B"},{"text":"Injection","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111218,"question":"Flurescent screen is a screen where visible spot","choices":[{"text":"vanishes","value":"A"},{"text":"is made","value":"B"},{"text":"becomes small and large","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111217,"question":"The CRO deflects the beam of electrons, when they passes through uniform","choices":[{"text":"electric field","value":"A"},{"text":"gravitational field","value":"B"},{"text":"magnetic flax","value":"C"},{"text":"magnetic field","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111216,"question":"CRO deflects the beam of","choices":[{"text":"proton","value":"A"},{"text":"a-particle","value":"B"},{"text":"electron","value":"C"},{"text":"neutron","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111215,"question":"(CRO) Cathode ray oscilloscope is a device used for high speed","choices":[{"text":"velocity","value":"A"},{"text":"graph plotting","value":"B"},{"text":"time-velocity","value":"C"},{"text":"none of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111214,"question":"A magnetic force on an electron travelling with 10<sup>8</sup>ms<sup>-1</sup>parallel to a field of strength 1 Wb m<sup>-2</sup>is","choices":[{"text":"Zero","value":"A"},{"text":"10<sup>5 </sup>m","value":"B"},{"text":"10<sup>-10</sup>N","value":"C"},{"text":"10<sup>8</sup>N","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111213,"question":"The magnetic force exerted on an electron moving with velocity 'v' at right angle to the magnetic field is given by","choices":[{"text":"F=eVB","value":"A"},{"text":"F=e<sup>2</sup>V/B","value":"B"},{"text":"F=e/VB","value":"C"},{"text":"F=B<sup>2</sup>/ev","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111212,"question":"A charged particle moving at right angle to the magnetic field will experience","choices":[{"text":"minimum force","value":"A"},{"text":"maximum force","value":"B"},{"text":"zero","value":"C"},{"text":"moderate force","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":111211,"question":"When charged particle is projected perpendicular to a uniform magnetic field its trajectory is","choices":[{"text":"circular","value":"A"},{"text":"elliptical","value":"B"},{"text":"cycloid","value":"C"},{"text":"straight line","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111210,"question":"Charge to mass ratio (e/m) of an electron is given by the relation","choices":[{"text":"e/m = 2V/Br<sup>2</sup>","value":"A"},{"text":"e/m = 2V/B<sup>2</sup>r","value":"B"},{"text":"e/m = 2V/B<sup>2</sup>r<sup>2</sup>","value":"C"},{"text":"e/m = V/2B<sup>2</sup>r<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":111209,"question":"The e/m of an electron moving in a circular path in a magnetic field is equal to","choices":[{"text":"V/Br","value":"A"},{"text":"V/B<sup>2</sup>r<sup>2</sup>","value":"B"},{"text":"V<sup>2</sup>/Br<sup>2</sup>","value":"C"},{"text":"V<sup>2</sup>/Br","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":111208,"question":"Centripetal force for electron is given by","choices":[{"text":"mv<sup>2</sup>/ r","value":"A"},{"text":"mv / r<sup>2</sup>","value":"B"},{"text":"mv<sup>2</sup>/ r","value":"C"},{"text":"mr<sup>2</sup>/ v","value":"D"},{"value":"E"}],"correctAnswer":1}]