[{"id":253816,"question":"The magnitude of potential barrier for Ge is","choices":[{"text":"0.7 v","value":"A"},{"text":"0.3 V","value":"B"},{"text":"7v","value":"C"},{"text":"3 v","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253815,"question":"A pulsating DC can be converted into constant voltage by using","choices":[{"text":"Filter","value":"A"},{"text":"Full wave rectifier","value":"B"},{"text":"Half wave rectifie","value":"C"},{"text":"Bridge rectifier","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253814,"question":"In a full wave rectifier with input frequency 50Hz. The frequency of pulsating D)C)\r\nreceived as an output across the load is","choices":[{"text":"50 Hz","value":"A"},{"text":"100 Hz","value":"B"},{"text":"500 Hz","value":"C"},{"text":"zero","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253813,"question":"The power output of a full wave rectifier is:","choices":[{"text":"Equal to H.W.R","value":"A"},{"text":"Twice of H.W.R","value":"B"},{"text":"Half of H.W.R","value":"C"},{"text":"Four times of H.W.R","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253812,"question":"In a full wave rectifier:","choices":[{"text":"DC current is twice that of half wave rectifier","value":"A"},{"text":"DC pulses are twice per cycle that of half wave rectifier","value":"B"},{"text":"DC voltage is twice that of half wave rectifier","value":"C"},{"text":"All are correct","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253811,"question":"A circuit that converts Pulsating DC into smooth DC contain :","choices":[{"text":"Filter","value":"A"},{"text":"Capacitor","value":"B"},{"text":"Inductor","value":"C"},{"text":"LC circuit","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253810,"question":"The efficiency of full wave rectifier is:","choices":[{"text":"25.6%","value":"A"},{"text":"81.2%","value":"B"},{"text":"81.6%","value":"C"},{"text":"71.2%","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253809,"question":"The efficiency of half wave rectifier is:","choices":[{"text":"25.6%","value":"A"},{"text":"1.2%","value":"B"},{"text":"40.6%","value":"C"},{"text":"66.6%","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253808,"question":"For a normal AC cycle, during T/2 to T the diode act as:","choices":[{"text":"Open switch","value":"A"},{"text":"full wave rectifier","value":"B"},{"text":"Close switch","value":"C"},{"text":"All are correct","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253807,"question":"A device which convert DC into AC is calleD)","choices":[{"text":"Invertor","value":"A"},{"text":"Generator","value":"B"},{"text":"Rectifier","value":"C"},{"text":"Motor","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253806,"question":"A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage\r\ngain is ………","choices":[{"text":"100,000","value":"A"},{"text":"100","value":"B"},{"text":"1000","value":"C"},{"text":"101","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253805,"question":"The resistance of operational amplifier between inverting and non-inverting terminal is of\r\nthe order of:","choices":[{"text":"Few Ohms","value":"A"},{"text":"Mega Ohms","value":"B"},{"text":"Few Kilo Ohms","value":"C"},{"text":"Micro Ohms","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253804,"question":"For the same value of resistors the output of non-inverting amplifier compared to the\r\noutput of inverting amplifier is, (ignoring phase difference)","choices":[{"text":"Greater","value":"A"},{"text":"Equal","value":"B"},{"text":"Smaller","value":"C"},{"text":"Undefined","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253803,"question":"A non-inverting amplifier has infinite input resistance then the voltage gain of non\u0002inverting amplifier will be:","choices":[{"text":"Zero","value":"A"},{"text":"Infinite","value":"B"},{"text":"One","value":"C"},{"text":"100","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253802,"question":"A non-conducting semiconductor diode is:","choices":[{"text":"Forward biased","value":"A"},{"text":"Poorly biased","value":"B"},{"text":"Reverse biased","value":"C"},{"text":"None of them","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253801,"question":"In full wave rectification, the output DC voltage across the load is obtained for.","choices":[{"text":"The positive half cycle of input AC only","value":"A"},{"text":"The negative half cycle of input AC","value":"B"},{"text":"The completes cycle of input AC only","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253275,"question":"The magnetic field due to the electric current in a conducting wire is:","choices":[{"text":"Towards the centre of the conducting wire","value":"A"},{"text":"Circular around the conducting wire","value":"B"},{"text":"In the direction of the electric current","value":"C"},{"text":"In the direction opposite to the electric current","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253274,"question":"The magnetic field of a solenoid is quite similar to that of a:","choices":[{"text":"Straight conductor","value":"A"},{"text":"A horse shoe magne","value":"B"},{"text":"Any magnet","value":"C"},{"text":"A bar magnet","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253269,"question":"The magnetic field produced due to the current in a straight wire is proportionalto the :","choices":[{"text":"Electric current","value":"A"},{"text":"Conducting material","value":"B"},{"text":"Length of the wire","value":"C"},{"text":"Diameter of the wire","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253262,"question":"If an electron vertically downwards, then the horizontal component of the earth’s\r\nmagnetic field will deflect it to wards","choices":[{"text":"West","value":"A"},{"text":"East","value":"B"},{"text":"North","value":"C"},{"text":"North","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253260,"question":"A tritium and alpha particle enter the magnetic field with same kinetic energy, what will\r\nbe the ratio of their radii?","choices":[{"text":"3:4","value":"A"},{"text":"√3: 1","value":"B"},{"text":"√3: 4","value":"C"},{"text":"√3:√2","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253256,"question":"An electron and a proton are projected at right angles to a uniform magnetic field with","choices":[{"text":"the electron trajectory will be less curved than proton’s trajectory","value":"A"},{"text":"the electron trajectory will be more curved than proton’s trajectory","value":"B"},{"text":") both trajectories will be equally curved","value":"C"},{"text":") both particles continue to move along a straight lins","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253252,"question":"The direction of force experienced by a moving in a magnetic field will be:","choices":[{"text":"Parallel to the field","value":"A"},{"text":"Opposite to the field","value":"B"},{"text":"Parallel to its direction of motion","value":"C"},{"text":"Perpendicular to both the field and the velocity vector","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253250,"question":"Charge to mass ratio (e/m) of a charge particle is also called its:","choices":[{"text":"Specific charge","value":"A"},{"text":"Specific Force","value":"B"},{"text":"Gyro-magnetic ratio","value":"C"},{"text":"Magneto-mechanical ratio","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253247,"question":"A positively charged particle is moving perpendicular to a uniform magnetic field. The\r\nmagnetic force makes the particle to move along:","choices":[{"text":"An elliptical path","value":"A"},{"text":"A circular path","value":"B"},{"text":"A parabolic path","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253242,"question":"Which one of the following particles projected perpendicular to a uniform magnetic field\r\nwith the same velocity will be deflected least?","choices":[{"text":"Electron","value":"A"},{"text":"Proton","value":"B"},{"text":"Deuton","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253240,"question":"A magnetic field","choices":[{"text":"Always exerts a force on a charged particle","value":"A"},{"text":"Never exerts a force on a charged particle","value":"B"},{"text":"Exerts a force on a charged particle if it is moving across the magnetic lines of force","value":"C"},{"text":"Exerts a force on a charged particle if it is moving along the magnetic lines of force.","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253237,"question":"A straight current carrying conductor experiences maximum forces in a uniform\r\nmagnetic field when it is placed:","choices":[{"text":"Parallel to the field","value":"A"},{"text":"Perpendicular o the field","value":"B"},{"text":"At an angle of 45 to the field","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253234,"question":"A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of\r\n20 mellites inside the solenoid is approximately:","choices":[{"text":"1A","value":"A"},{"text":"2A","value":"B"},{"text":"4A","value":"C"},{"text":"8A","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253233,"question":"Magnetic field inside a solenoid is:","choices":[{"text":") Directly proportional to current","value":"A"},{"text":"Inversely proportional to current","value":"B"},{"text":"Directly proportional to its length","value":"C"},{"text":"Inversely proportional to total no of turns","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253231,"question":"A source of a magnetic field is:","choices":[{"text":"An isolated magnetic","value":"A"},{"text":"A static electric charge","value":"B"},{"text":"A moving electric charge","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253218,"question":"A steady current is flowing in a conductor of non-uniform cross-section. \r\nThecharge passing through any cross-section per unit time is","choices":[{"text":"Directly proportional to the area of cross-section","value":"A"},{"text":"Inversely proportional to the area of cross-section","value":"B"},{"text":"Proportional to square of the area of cross-section","value":"C"},{"text":"Independent of the area of cross-section","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253217,"question":"A cell of negligible resistance and e.m.f 2 V is connected across a series\r\ncombination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is","choices":[{"text":"0.6 V","value":"A"},{"text":"1/3 V","value":"B"},{"text":" 2/3 V","value":"C"},{"text":"4/3 V","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253212,"question":"When resistances are connected in Parallel, the effective resistance will\r\nbe","choices":[{"text":"Product of the reciprocals of the individual resistances","value":"A"},{"text":"Product of the individual resistances","value":"B"},{"text":"Sum of the reciprocals of the individual resistances","value":"C"},{"text":"Sum of the individual resistances","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":253209,"question":"Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm:","choices":[{"text":"3 series, 4 parallel","value":"A"},{"text":"5 series, 2 parallel","value":"B"},{"text":"2 series, 5 parallel","value":"C"},{"text":"4 series, 3 parallel","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253206,"question":"Which of the Following bulb will glow Brightest?","choices":[{"text":"100W","value":"A"},{"text":"200W","value":"B"},{"text":"300W","value":"C"},{"text":"400W","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":253204,"question":"The emf of a cell of negligible internal resistance is 2V. It is connected to the series\r\ncombination of 𝟐𝛀, 𝟑𝛀 𝐚𝐧𝐝 𝟓𝛀 resistance. The potential difference across 𝟑𝛀 resistance will be\r\nin volt:","choices":[{"text":"0.6","value":"A"},{"text":"2/3","value":"B"},{"text":"3","value":"C"},{"text":"6","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253202,"question":"A 100W, 220V bulb is operated on a 110V line, the power consumed is:","choices":[{"text":"25W","value":"A"},{"text":"75W","value":"B"},{"text":"50W","value":"C"},{"text":"100W","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":253198,"question":"Resistance of 60 watt bulbs in 120V line is:","choices":[{"text":"20 ohms","value":"A"},{"text":"240 ohms","value":"B"},{"text":"0.15 ohms","value":"C"},{"text":"180 ohms","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":253193,"question":"If a source of emf is traversed from positive to negative the potential change will be:","choices":[{"text":"Positive","value":"A"},{"text":"Negative","value":"B"},{"text":"Zero","value":"C"},{"text":"Constant","value":"D"},{"value":"E"}],"correctAnswer":2}]