[{"id":154198,"question":"Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:","choices":[{"text":"Of same magnitude in the same direction","value":"A"},{"text":"Of different magnitude in the same direction","value":"B"},{"text":"Of same magnitude but in opposite direction","value":"C"},{"text":"Of different magnitude in the opposite direction","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":154195,"question":"When there is no relative motion between the magnet and coil, the galvanometer indicates:","choices":[{"text":"No current in circuit","value":"A"},{"text":"An increasing current","value":"B"},{"text":"A decreasing current","value":"C"},{"text":"Either B or C","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154193,"question":"<br>The magnitude of induced emf depends upon the:","choices":[{"text":"Rate of decrease of magnetic field","value":"A"},{"text":"Rate of change of magnetic field","value":"B"},{"text":"Rate of increase of magnetic flux","value":"C"},{"text":"Constancy of magnetic field","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":154191,"question":"Micheal Faraday and joseph Henry belong respectively to:","choices":[{"text":"USA and England","value":"A"},{"text":"England and France","value":"B"},{"text":"England and USA","value":"C"},{"text":"USA and France","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":154189,"question":"In magnet-coil experiment, emf can be produced by:","choices":[{"text":"Keeping the coil stationary and moving the magnet","value":"A"},{"text":"Keeping the magnet stationary and moving the coil","value":"B"},{"text":"Relative motion of the loop and magnet","value":"C"},{"text":"Any one of above","value":"D"},{"text":"All above","value":"E"}],"correctAnswer":5},{"id":154185,"question":"The induced current in the loop can be increased by:","choices":[{"text":"Using a strong magnetic field","value":"A"},{"text":"Moving the loop faster","value":"B"},{"text":"Replacing the loop by a coil of many turns","value":"C"},{"text":"All of above","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154183,"question":"The induced current in a conductor depends upon:","choices":[{"text":"Resistance of the loop","value":"A"},{"text":"Speed with which the conductor moves","value":"B"},{"text":"Any of these","value":"C"},{"text":"Both A and B","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154180,"question":"The phenomenon of generation of induced emf is called:","choices":[{"text":"Electrostatic induced","value":"A"},{"text":"Magnetic induced","value":"B"},{"text":"Electromagnetic induced","value":"C"},{"text":"Electric induced","value":"D"},{"text":"Both A and C","value":"E"}],"correctAnswer":3},{"id":154176,"question":"<p class=\"MsoNormal\" style=\"margin-left:18.0pt\"><span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">An\r\ninduced current can be produced by:</span><o:p></o:p></p>","choices":[{"text":"<span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">Constant magnetic field</span>","value":"A"},{"text":"<span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">Changing magnetic field</span>","value":"B"},{"text":"<span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">Varying magnetic field</span>","value":"C"},{"text":"<span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">Constant electric field</span>","value":"D"},{"text":"<span style=\"font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;\">None of these</span>","value":"E"}],"correctAnswer":2},{"id":154175,"question":"An induced current can be produced by:","choices":[{"text":"Constant magnetic field","value":"A"},{"text":"Changing magnetic field","value":"B"},{"text":"Varying magnetic field","value":"C"},{"text":"Constant electric field","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":154172,"question":"An emf is set up in a conductor when it:","choices":[{"text":"Is kept in a magnetic field","value":"A"},{"text":"Is kept in an electric field","value":"B"},{"text":"Moves across a magnetic field","value":"C"},{"text":"Both A and B","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":154170,"question":"The current produced by moving a loop of wire across a magnetic field is called:","choices":[{"text":"Direct current","value":"A"},{"text":"Magnetic current","value":"B"},{"text":"Alternating current","value":"C"},{"text":"Induced current","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154167,"question":"Eddy current is produced when:","choices":[{"text":"A metal is kept in varying magnetic field","value":"A"},{"text":"A metal is kept in steady magnetic field","value":"B"},{"text":"A circular coil is placed in a steady magnetic field","value":"C"},{"text":"A current is passed through a circular coil","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154163,"question":"Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:","choices":[{"text":"45 V","value":"A"},{"text":"15 V","value":"B"},{"text":"90 V","value":"C"},{"text":"300 V","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154162,"question":"Which of the following quantities remain constant in step up transformer?","choices":[{"text":"Current","value":"A"},{"text":"Voltage","value":"B"},{"text":"Power","value":"C"},{"text":"Heat","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":154158,"question":"In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is:","choices":[{"text":"0.2 henry","value":"A"},{"text":"0.1 henry","value":"B"},{"text":"0.8 henry","value":"C"},{"text":"0.04 henry","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154154,"question":"The induced emf in a coil is proportional to:","choices":[{"text":"Magnetic flux through a coil","value":"A"},{"text":"Rate of change of magnetic flux through the coil","value":"B"},{"text":"Area of the coil","value":"C"},{"text":"Product of magnetic flux and area of the coil","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":154152,"question":"What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10<sup>-2</sup>Wb, and change in current is 0.01 A?","choices":[{"text":"2 H","value":"A"},{"text":"3 H","value":"B"},{"text":"1/2 H","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154150,"question":"The device in which induced emf is statically induced emf is:","choices":[{"text":"Transformer","value":"A"},{"text":"AC generator","value":"B"},{"text":"Alternator","value":"C"},{"text":"Dynamo","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":154149,"question":"For inducting emf in a coil the basic requirement is that:","choices":[{"text":"Flux should link the coil","value":"A"},{"text":"Change in flux should link the coil","value":"B"},{"text":"Coil should form a closed loop","value":"C"},{"text":"Both B and C are true","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":152061,"question":"Referring to above figure, due to change in current in the coil P, the change in magnetic flux","choices":[{"text":"Is associated with coil P","value":"A"},{"text":"Is associated with coil S","value":"B"},{"text":"Causes and induced current in coil S","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":152060,"question":"Referring to above figure, current in coil P falls from its maximum value to zero","choices":[{"text":"At the instant the switch is closed","value":"A"},{"text":"At the instant the switch is opened","value":"B"},{"text":"When switch is kept open","value":"C"},{"text":"When switch is kept closed","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":152058,"question":"Referring to above figure, current in the coil P grows from zero to its maximum value","choices":[{"text":"At the instant the switch is closed","value":"A"},{"text":"At the instant the switch is opened","value":"B"},{"text":"When switch is kept open","value":"C"},{"text":"All of above","value":"D"},{"text":"Neither of above","value":"E"}],"correctAnswer":1},{"id":152056,"question":"A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when","choices":[{"text":"The coil is distorted","value":"A"},{"text":"The coil is rotated","value":"B"},{"text":"The coil is neither distorted nor rotated","value":"C"},{"text":"Both A and B","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":152054,"question":"Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current","choices":[{"text":"Of same magnitude in the same direction","value":"A"},{"text":"Of different magnitude in the same direction","value":"B"},{"text":"Of same magnitude but in opposite direction","value":"C"},{"text":"Of different magnitude in the opposite direction","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":152051,"question":"When there is no relative motion between the magnet and coil, the galvanometer indicated","choices":[{"text":"No current in the circuit","value":"A"},{"text":"An increasing current","value":"B"},{"text":"A decreasing current","value":"C"},{"text":"A constant current","value":"D"},{"text":"Either B or C","value":"E"}],"correctAnswer":1},{"id":152050,"question":"The magnitude of induced emf depends upon the","choices":[{"text":"Rate of decrease of magnetic field","value":"A"},{"text":"Rate of change of magnetic field","value":"B"},{"text":"Rate of increase of magnetic flux","value":"C"},{"text":"Constancy of magnetic field","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":152048,"question":"Michael Faraday and Joseph Henry belong respectively to","choices":[{"text":"USA and England","value":"A"},{"text":"England and France","value":"B"},{"text":"England and USA","value":"C"},{"text":"USA and France","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":152047,"question":"In magnet-coil experiment, emf can be produced by","choices":[{"text":"Keeping the coil stationary and moving the magnet","value":"A"},{"text":"Keeping the magnet stationary and moving","value":"B"},{"text":"Relative motion of the loop and magnet","value":"C"},{"text":"Any one of above","value":"D"},{"text":"All above","value":"E"}],"correctAnswer":5},{"id":152046,"question":"The induced current in the loop can be Increased by","choices":[{"text":"Using a stronger magnetic field","value":"A"},{"text":"Moving the loop faster","value":"B"},{"text":"Replacing the loop by a coil of many turns","value":"C"},{"text":"All above","value":"D"},{"text":"Both A and B","value":"E"}],"correctAnswer":4}]