[{"id":156479,"question":"The direction of induced current is always so as to oppose the cause which produces it. This is","choices":[{"text":"Lenz's law","value":"A"},{"text":"Ampere's law","value":"B"},{"text":"Faraday's law","value":"C"},{"text":"Coulomb's law","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156477,"question":" Faraday's law of electromagnetic induction has been used in the construction of:","choices":[{"text":"Galvanometer","value":"A"},{"text":"Voltmeter","value":"B"},{"text":"Electric motor","value":"C"},{"text":"Electric genrator","value":"D"},{"text":"Commutator","value":"E"}],"correctAnswer":4},{"id":156474,"question":"The law of electromagnetic induction is related to:","choices":[{"text":"Coulomb","value":"A"},{"text":"Ampere","value":"B"},{"text":"Faraday","value":"C"},{"text":"Lenz","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":156473,"question":"The rate change of area expressed is expressed in:","choices":[{"text":"None of these","value":"A"},{"text":"ms-1","value":"B"},{"text":"m2s-2","value":"C"},{"text":"ms-2","value":"D"},{"text":"m2s-1","value":"E"}],"correctAnswer":5},{"id":156470,"question":"Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:
","choices":[{"text":"Also 20º
","value":"A"},{"text":"70º
","value":"B"},{"text":"90º
","value":"C"},{"text":"180º
","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156467,"question":"A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:","choices":[{"text":"Zero","value":"A"},{"text":"Of smaller magnitude","value":"B"},{"text":"Of larger magnitude","value":"C"},{"text":"Sometimes B, sometimes C","value":"D"},{"text":"Neither of these","value":"E"}],"correctAnswer":1},{"id":156462,"question":"A metal road of length 1m is moving at a speed of 1 ms-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:
","choices":[{"text":"0.25 N","value":"A"},{"text":"0.25 V","value":"B"},{"text":"2.5 V","value":"C"},{"text":"2.5 N","value":"D"},{"text":"25 V","value":"E"}],"correctAnswer":2},{"id":156458,"question":"Motional emf is called motional:","choices":[{"text":"Electromagnetic force and is measured in newtons","value":"A"},{"text":"Electromotive force and is measured in volt","value":"B"},{"text":"Electromotive force and is measured in newtons","value":"C"},{"text":"Electromagnetic force and is measured in volts","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156454,"question":"When the conductor moved across a magnetic field:","choices":[{"text":"Emf induced is similar to that of a battery
","value":"A"},{"text":"Emf induced gives rise to induced current
","value":"B"},{"text":"An emf induced across its ends
","value":"C"},{"text":"All are correct
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":3},{"id":156317,"question":"A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:","choices":[{"text":"The coil is destroyed","value":"A"},{"text":"The coil is Rotated","value":"B"},{"text":"The coil is neither destroyed nor rotated","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":156316,"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":156315,"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":156313,"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},{"id":156312,"question":"The induced current is 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":156311,"question":"The phenomenon of generation of induced emf is called","choices":[{"text":"Electrostatic induction","value":"A"},{"text":"Magnetic induction","value":"B"},{"text":"Electromagnetic induction","value":"C"},{"text":"Electric induction","value":"D"},{"text":"Both (A) and (D)","value":"E"}],"correctAnswer":3},{"id":156310,"question":"An induced current can be produced by:","choices":[{"text":"Constant magnetic field","value":"A"},{"text":"Changing magnetic field","value":"B"},{"text":"Varying magnetic feild","value":"C"},{"text":"Constant electric field","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156309,"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 a electric field","value":"B"},{"text":"Move across a magnetic field","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":156308,"question":"The current produced by moving a loop of a 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":154221,"question":"When a conductoris moved across a magnetic field:","choices":[{"text":"Emf induced its similar to that of a battery","value":"A"},{"text":"Emf induced gives rise to induced current","value":"B"},{"text":"An emf is induced across its ends","value":"C"},{"text":"All are correct","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154220,"question":"In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:","choices":[{"text":"Both A and C","value":"A"},{"text":"Induced emf","value":"B"},{"text":"Both A and B","value":"C"},{"text":"Motion emf","value":"D"},{"text":"Electrostatic emf","value":"E"}],"correctAnswer":1},{"id":154219,"question":"In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:","choices":[{"text":"Motion emf","value":"A"},{"text":"Electrostatic emf","value":"B"},{"text":"Induced emf","value":"C"},{"text":"Both A and B","value":"D"},{"text":"Both A and C","value":"E"}],"correctAnswer":5},{"id":154218,"question":"When a conductor is moved across a magnetic field, the redistribution of charge sets up:","choices":[{"text":"Magnetic field","value":"A"},{"text":"Electrostatic field","value":"B"},{"text":"Electromagnetic field","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":154216,"question":"When a conductor moved with its length parallel to the lines of magnetic fled:","choices":[{"text":"An emf is induced across its ends","value":"A"},{"text":"Emf induced is similar to that of a battery","value":"B"},{"text":"Emf passes through the conductor","value":"C"},{"text":"Both A and B","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":5},{"id":154215,"question":"The product of induced current and the resistance of the wire through which the current is passing is called:","choices":[{"text":"Electromagnetic induction","value":"A"},{"text":"induced emf","value":"B"},{"text":"Induced current","value":"C"},{"text":"Self induced","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":154214,"question":"The unit of induced emf is:","choices":[{"text":"Volt","value":"A"},{"text":"Nm/As","value":"B"},{"text":"Joule coul-1","value":"C"},{"text":"Both A and C","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":5},{"id":154213,"question":"Referring to above figure, a changing current in coil P can be produced:","choices":[{"text":"At the instant the switch is closed","value":"A"},{"text":"At the instant the switch is opened","value":"B"},{"text":"With the help of rheostat","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154211,"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 an induced current is coil S","value":"C"},{"text":"All of these","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":4},{"id":154206,"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":154204,"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":154201,"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}]