[{"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":156307,"question":"When the charged particle is projected at right angles to the field, then experienced by it will be:","choices":[{"text":"Maximum","value":"A"},{"text":"Zero","value":"B"},{"text":"qvB","value":"C"},{"text":"Both (A) and (B)","value":"D"},{"text":"Both (A) and (C)","value":"E"}],"correctAnswer":5},{"id":156306,"question":"A long wire wound tightly on a cylindrical core is called:","choices":[{"text":"Potentiometer","value":"A"},{"text":"Solenoid","value":"B"},{"text":"Toroid","value":"C"},{"text":"Wheat and stone bridge","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156305,"question":"Magnetic flux passing through the an element of are A placed perpendicular to a uniform magnetic field Bis:","choices":[{"text":"Maximum","value":"A"},{"text":"Minimum","value":"B"},{"text":"Zero","value":"C"},{"text":"Very small","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156304,"question":"Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:
","choices":[{"text":"BACosѲ
","value":"A"},{"text":"Zero","value":"B"},{"text":"BA","value":"C"},{"text":"BA sinѲ","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":3},{"id":156303,"question":"At a given instant, a photon moves in +x direction in a region where there magnetic field in -z direction. The magnetic force on the proton will be the:","choices":[{"text":"-y direction","value":"A"},{"text":"+y direction","value":"B"},{"text":"+z direction","value":"C"},{"text":"-z direction","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156302,"question":"NmA-1 is commonly called:","choices":[{"text":"Weber","value":"A"},{"text":"Apmere","value":"B"},{"text":"Guass","value":"C"},{"text":"Coulomb","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156301,"question":"Strength of magnetic field is measured in SI units, in:","choices":[{"text":"N","value":"A"},{"text":"N/Am","value":"B"},{"text":"Am/N","value":"C"},{"text":"Nm/A","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156300,"question":"The permeability of free space is measured in:","choices":[{"text":"Wb/Am","value":"A"},{"text":"Wb A/m","value":"B"},{"text":"Am/Wb","value":"C"},{"text":"m/Web A","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156299,"question":"If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:","choices":[{"text":"Becomes Half","value":"A"},{"text":"Becomes double","value":"B"},{"text":"Is not affected","value":"C"},{"text":"Becomes one fourth","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":2},{"id":156298,"question":"The magnetic field inside a solenoid can be increased by:","choices":[{"text":"Increasing n","value":"A"},{"text":"Decreasing I","value":"B"},{"text":"Increasing I","value":"C"},{"text":"By using iron core within solenoid","value":"D"},{"text":"All correct except (B)","value":"E"}],"correctAnswer":5},{"id":156297,"question":"Total number of turns on 0.15 m length solenoid is 300. the value of n is:","choices":[{"text":"Greater than 300","value":"A"},{"text":"Smaller than 300","value":"B"},{"text":"Equal to 300","value":"C"},{"text":"Any of (A) or (B)","value":"D"},{"text":"Any of (A) or(C)","value":"E"}],"correctAnswer":1},{"id":156296,"question":"Hold the solenoid in the right hand with fingers\r\ncurling in the direction of current. The direction of the field will be given\r\nby:","choices":[{"text":"Thumb
","value":"A"},{"text":"Curled fingers
","value":"B"},{"text":"Middle finger
","value":"C"},{"text":"Arm of right hand
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":1},{"id":156294,"question":"In the formula B= µ̻ nl, the symbol n denotes:","choices":[{"text":"Total number of turns\r\nof solenoid
","value":"A"},{"text":"Number\r\nof turns per unit length
","value":"B"},{"text":"Number of turns per\r\nunit volume
","value":"C"},{"text":"Numbers of turns per\r\nunit area
","value":"D"},{"text":"Number of moles
","value":"E"}],"correctAnswer":2},{"id":156292,"question":"A field is uniform and much stronger:","choices":[{"text":"Inside\r\na long solenoid
","value":"A"},{"text":"Outside a long solenoid
","value":"B"},{"text":"At the end of a long\r\nsolenoid
","value":"C"},{"text":"At the central point of\r\nlong solenoid
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":1},{"id":156291,"question":"A solenoid is a coil of wire which is:","choices":[{"text":"Short, loosely wound, cylindrical
","value":"A"},{"text":"Long, tightly wound,\r\nspherical
","value":"B"},{"text":"Long, loosely wound,\r\ncylindrical
","value":"C"},{"text":"Long,\r\ntightly wound, cylindrical
","value":"D"},{"text":"None of these
","value":"E"}],"correctAnswer":4},{"id":156290,"question":"Amperean path is a:
","choices":[{"text":"Closed path
","value":"A"},{"text":"Rectangular path
","value":"B"},{"text":"Circular path
","value":"C"},{"text":"Any\r\nof above
","value":"D"},{"text":"Broken path
","value":"E"}],"correctAnswer":4},{"id":156289,"question":"Magnetic induction is also called as:","choices":[{"text":"Ampere’s\r\nlaw
","value":"A"},{"text":"Faraday’s law
","value":"B"},{"text":"Lenz’s law
","value":"C"},{"text":"Newton’s law
","value":"D"},{"text":"Coulomb’s law
","value":"E"}],"correctAnswer":1},{"id":156288,"question":"if the field is directed along the normal to the\r\narea, then flux is:","choices":[{"text":"Maximum
","value":"A"},{"text":"Equal to zero
","value":"B"},{"text":"Equal to BA
","value":"C"},{"text":"Minimum
","value":"D"},{"text":"Both\r\n(A) and (C)
","value":"E"}],"correctAnswer":5},{"id":156287,"question":"the current is pass\r\nthrough the straight wire. The magnetic field established around it has its\r\nlines of force:
","choices":[{"text":"Circular\r\nand endless
","value":"A"},{"text":"Oval in shape and\r\nendless
","value":"B"},{"text":"Straight
","value":"C"},{"text":"Parabolic
","value":"D"},{"text":"All are true","value":"E"}],"correctAnswer":1},{"id":156286,"question":"Magnetic lines of force:","choices":[{"text":"Cannot\r\nintersect at all
","value":"A"},{"text":"Intersect at infinity
","value":"B"},{"text":"Intersect within magnet
","value":"C"},{"text":"Intersect at Neutral Point
","value":"D"},{"text":"None of these","value":"E"}],"correctAnswer":1},{"id":156285,"question":"magnetic field is a:","choices":[{"text":"Vector\r\nquantity
","value":"A"},{"text":"Scalar quantity
","value":"B"},{"text":"Scalar as well as\r\nscalar quantity
","value":"C"},{"text":"Any of (A) or (B)
","value":"D"},{"text":"Neither (A) nor (B)","value":"E"}],"correctAnswer":1},{"id":156284,"question":"The pointer of a\r\nmagnetic compass:
","choices":[{"text":"Is affected only by\r\npermanent magnets
","value":"A"},{"text":"Align\r\nitself parallel to the applied magnetic field
","value":"B"},{"text":"Vibrates in the\r\nmagnetic field of the current
","value":"C"},{"text":"Aligns itself\r\nperpendicular to the magnetic field
","value":"D"},{"text":"Both (C) and (D)","value":"E"}],"correctAnswer":2},{"id":156283,"question":"It is customary represent a current flowing\r\ntowards the reader by a symbol","choices":[{"text":"(x)","value":"A"},{"text":"(+)","value":"B"},{"text":"(.)","value":"C"},{"text":"(-)","value":"D"},{"text":"(÷)
","value":"E"}],"correctAnswer":3},{"id":156282,"question":"A current carrying conductor sets up its own:","choices":[{"text":"Electric field
","value":"A"},{"text":"Nuclear field
","value":"B"},{"text":"Magnetic field
","value":"C"},{"text":"Both\r\n(A) and (C)
","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":4},{"id":156281,"question":"In the region surrounding a current carrying\r\nwire:","choices":[{"text":"A magnetic field is\r\nsetup
","value":"A"},{"text":"The lines of force are\r\nelliptical
","value":"B"},{"text":"Direction of lines of\r\nforces depends upon direction of current
","value":"C"},{"text":"Both\r\n(A) and (C)
","value":"D"},{"text":"All of these","value":"E"}],"correctAnswer":4},{"id":156280,"question":"When some compass needles are placed on a card\r\nboard along a circle with the center at the wire, they will","choices":[{"text":"Point\r\nthe direction of N-S
","value":"A"},{"text":"Set themselves tangential\r\nto the circle
","value":"B"},{"text":"Point in the direction\r\nof E-W
","value":"C"},{"text":"None of these
","value":"D"},{"text":"Point in direction of S-E","value":"E"}],"correctAnswer":1},{"id":156279,"question":"Electrolysis is the study of conduction of\r\nelectricity through:","choices":[{"text":"Solids","value":"A"},{"text":"Liquids","value":"B"},{"text":"Gases","value":"C"},{"text":"Plasma","value":"D"},{"value":"E"}],"correctAnswer":2}]