[{"id":227302,"question":"The effective way to increase the sensitivity of moving coil galvanometer is.","choices":[{"text":"Increase the area of coil","value":"A"},{"text":"Increase the number of turn","value":"B"},{"text":"Increase the magnetic field","value":"C"},{"text":"Increase the value of constant C","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227301,"question":"In order to increase sensitivity of galvanometer the value of C may be","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Neither increase nor decrease","value":"C"},{"text":"Remain same","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":227300,"question":"The sensitivity of galvanometer directly depends upon","choices":[{"text":"Magnetic field","value":"A"},{"text":"Area of coil","value":"B"},{"text":"Both a and b","value":"C"},{"text":"None of a, b, c","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227299,"question":"Sensitivity of a galvanometer can be increased by","choices":[{"text":"Decreasing the value of torsional couple","value":"A"},{"text":"Decreasing number of turns","value":"B"},{"text":"Decreasing area of plane of coil","value":"C"},{"text":"Decreasing magnetic field","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227298,"question":"Torque is produced in a current carrying coil when it is placed in a","choices":[{"text":"Magnetic field","value":"A"},{"text":"Electric field","value":"B"},{"text":"Gravitational field","value":"C"},{"text":"Nuclear field","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227297,"question":"The function of three anodes a C.R.O is","choices":[{"text":"To accelerate electrons only","value":"A"},{"text":"To focus the electrons only","value":"B"},{"text":"To control the brightness of spot on screen","value":"C"},{"text":"To accelerate and focus the electrons","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":227296,"question":"Cathode ray oscilloscope works by deflecting a beams","choices":[{"text":"Neutrons","value":"A"},{"text":"Protons","value":"B"},{"text":"Electrons","value":"C"},{"text":"Positron","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227295,"question":"The brightness of the spot of CRO screen is controlled by.","choices":[{"text":"Anode","value":"A"},{"text":"Cathode","value":"B"},{"text":"Grid","value":"C"},{"text":"Deflecting plates","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227294,"question":"Brightness of screen of CRO controlled by","choices":[{"text":"Grid","value":"A"},{"text":"Filament","value":"B"},{"text":"Anode","value":"C"},{"text":"Cathode","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227293,"question":"Grid in cathode ray oscilloscope controls.","choices":[{"text":"Number of electron","value":"A"},{"text":"Temperature of filament","value":"B"},{"text":"Frequency of electron","value":"C"},{"text":"Energy of electrons","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227292,"question":"The value of e/m is smallest for","choices":[{"text":"Proton","value":"A"},{"text":"Electron","value":"B"},{"text":"Beta particle","value":"C"},{"text":"Positron","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":227291,"question":"An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.","choices":[{"text":"upward","value":"A"},{"text":"To ward right","value":"B"},{"text":"Down ward","value":"C"},{"text":"Toward left","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227290,"question":"The e/m of a neutron is","choices":[{"text":"Less than electron","value":"A"},{"text":"The same as electron","value":"B"},{"text":"Zero","value":"C"},{"text":"Greater than election","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227289,"question":"When a charge is projected perpendicular to a uniform magnetic field, tis path is","choices":[{"text":"Spiral","value":"A"},{"text":"Helix","value":"B"},{"text":"Ellipse","value":"C"},{"text":"Circular","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":227288,"question":"The sum of electric and magnetic force is called.","choices":[{"text":"Maxwell force","value":"A"},{"text":"Lorentz force","value":"B"},{"text":"Newton's force","value":"C"},{"text":"Centripetal force","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":227287,"question":"A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.","choices":[{"text":"Speed","value":"A"},{"text":"Kinetic energy","value":"B"},{"text":"Path of motion","value":"C"},{"text":"angular velocity","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":227286,"question":"If a charge is at rest in a magnetic field then force on charge is","choices":[{"text":"Zero","value":"A"},{"text":"Double","value":"B"},{"text":"One fourth","value":"C"},{"text":"Four times","value":"D"},{"value":"E"}],"correctAnswer":1}]