[{"id":123572,"question":"A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then","choices":[{"text":"The charge in the plates reduces and potential difference increase","value":"A"},{"text":"Potential difference between the plates increase, stored energy decreases and charge remains the same","value":"B"},{"text":"Potential difference between the plates decreases and charge remains unchanged","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123571,"question":"One moving a charge of 20 coulombs by 2 cm, 2 J of work is done, then the potential difference between the points is","choices":[{"text":"0.1 V","value":"A"},{"text":"8 V","value":"B"},{"text":"2 V","value":"C"},{"text":"0.5 V","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123569,"question":"An alpha particle is accelerated through a potential difference of 10<sup>6</sup>volt. Its kinetic energy will be","choices":[{"text":"1 MeV","value":"A"},{"text":"2 MeV","value":"B"},{"text":"4 MeV","value":"C"},{"text":"8 MeV","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123565,"question":"A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 KV, its kinetic energy will be","choices":[{"text":"1840 KeV","value":"A"},{"text":"1/1840 KeV","value":"B"},{"text":"1 KeV","value":"C"},{"text":"920 KeV","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123563,"question":"Electric potential of earth is taken to be zero because the earth is good","choices":[{"text":"Semiconductor","value":"A"},{"text":"Conductor","value":"B"},{"text":"Insulator","value":"C"},{"text":"Dielectric","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123562,"question":"In bringing an electron towards another electron, electrostatic potential energy of system","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"Remains uncharged","value":"C"},{"text":"Becomes zero","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123560,"question":"The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10<sup>-15 </sup>is","choices":[{"text":"9 x 10<sup>5</sup>V","value":"A"},{"text":"9 V","value":"B"},{"text":"8 x 10<sup>6</sup>V","value":"C"},{"text":"80 V","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123558,"question":"At any point on the right bisector of the line joining two equal and opposite charges","choices":[{"text":"At electric field is zero","value":"A"},{"text":"The electric potential is zero","value":"B"},{"text":"The electric potential decreases with increasing distance from the centre","value":"C"},{"text":"The electric field is perpendicular to the line joining the charges","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123557,"question":"Some charge is being given to a conductor. Then its potential","choices":[{"text":"Is maximum at surface","value":"A"},{"text":"Is maximum at centre","value":"B"},{"text":"Is remain same throughout the conductor","value":"C"},{"text":"Is maximum somewhere between surface and centre","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123556,"question":"Two conductors having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if","choices":[{"text":"They have the same potential","value":"A"},{"text":"They have the same amount of charge","value":"B"},{"text":"They have the same capacity","value":"C"},{"text":"They have the same shape","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123554,"question":"A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?","choices":[{"text":"Electric potential at the surface of the cube is zero","value":"A"},{"text":"Electric potential within the cube is zero","value":"B"},{"text":"Electric filed is normal to the surface of the cube","value":"C"},{"text":"Electric filed varies within the cube","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123552,"question":"If the distance of separation between two chares is increased, the electrical potential energy of the system will","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"May increase or decrease","value":"C"},{"text":"Remain the same","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123551,"question":"If a charged spherical conductor of radius 10 cm has potential V at a point distance 5 cm from its centre, then the potential at a point distance 15 cm from the centre will be","choices":[{"text":"1/3 V","value":"A"},{"text":"2/3 V","value":"B"},{"text":"3/2 V","value":"C"},{"text":"3V","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123549,"question":"Equal charges are given to two spheres of different radii. The potential will","choices":[{"text":"Be more on the smaller sphere","value":"A"},{"text":"Be more on the bigger sphere","value":"B"},{"text":"Be equal on both the sphere","value":"C"},{"text":"Depend on the nature of the material of the sphere","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123547,"question":"An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be","choices":[{"text":"V/e","value":"A"},{"text":"eV","value":"B"},{"text":"e/V","value":"C"},{"text":"V","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123545,"question":"The electric field due to an infinite long thin wire at a distance R varies as","choices":[{"text":"1/R","value":"A"},{"text":"1/R<sup>2</sup>","value":"B"},{"text":"R","value":"C"},{"text":"R<sup>2</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123544,"question":"A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is","choices":[{"text":"Two","value":"A"},{"text":"1/2","value":"B"},{"text":"Zero","value":"C"},{"text":"3/2","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123543,"question":"The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10<sup>-19</sup>N, is","choices":[{"text":"25","value":"A"},{"text":"225","value":"B"},{"text":"625","value":"C"},{"text":"1250","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123541,"question":"Two point charges A and B separated by a distance R attract each other with a force of 12 x 10<sup>-3</sup>N. The force between A and B when the charges on them are doubled and distance is halved","choices":[{"text":"1.92 N","value":"A"},{"text":"19.2 N","value":"B"},{"text":"12 N","value":"C"},{"text":"0.192 N","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123539,"question":"A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when","choices":[{"text":"q = Q/4","value":"A"},{"text":"q = Q/2","value":"B"},{"text":"q = !","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123538,"question":"The force of repulsion between two point charges is F, when these are at a distance 0.1 m apart. Now the point charges are replaced by sphere of radii 5 cm each having the same charge as that of the respective point charges. The distance between their centre is again kept 0.1 m ; then the force of repulsion will","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Remain F","value":"C"},{"text":"Become 10F/9","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123537,"question":"A point charge Q is placed at the mid-point of a line joining two charges. 4q and q. if the net force on charge q is zero. then Q must be equal to","choices":[{"text":"-q","value":"A"},{"text":"+q","value":"B"},{"text":"-2q","value":"C"},{"text":"+4q","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123536,"question":"A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)","choices":[{"text":"2","value":"A"},{"text":"1","value":"B"},{"text":"0.5","value":"C"},{"text":"1.5","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123535,"question":"A hollow insulated conduction sphere is given a positive charge of 10<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);\"><b>μ</b></span>C. What will be the electric field at the centre of the sphere if its radius is 2 meters?","choices":[{"text":"Zero","value":"A"},{"text":"5<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);\"><b>μ</b></span>C m<sup>-2</sup>","value":"B"},{"text":"20<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);\"><b>μ</b></span>C m<sup>-2</sup>","value":"C"},{"text":"8<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);\"><b>μ</b></span>C m<sup>-2</sup>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123534,"question":"An electric dipole is at the centre of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)","choices":[{"text":"Q/4<i style=\"box-sizing: border-box; color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 18px; background-color: rgb(255, 255, 248);\">π</i>r<sup>2</sup>","value":"A"},{"text":"2Q/4<i style=\"box-sizing: border-box; color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 18px; background-color: rgb(255, 255, 248);\">π</i>r<sup>2</sup>","value":"B"},{"text":"Q.d","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123533,"question":"Consider a spherical shell of metal at he centre of which a positive point charge is kept","choices":[{"text":"The electric filed is zero outside the shell","value":"A"},{"text":"The electric field is zero everywhere","value":"B"},{"text":"The electric field is zero in the region inside the shell","value":"C"},{"text":"The electric field is non-zero in both regions outside and inside the shell","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123532,"question":"The unit of intensity of electric field is","choices":[{"text":"newton/coluomb","value":"A"},{"text":"jule/coluomb","value":"B"},{"text":"volt x metre","value":"C"},{"text":"newton/metre","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123531,"question":"In a Milikian's oil drop experiment the charge on an oil drop is calculated to be 6.35 x 10<sup>-19</sup>C. The number of excess electrons on the drop is","choices":[{"text":"3.9","value":"A"},{"text":"4","value":"B"},{"text":"4.2","value":"C"},{"text":"6","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123530,"question":"Two point charge +3<span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><b>μC</b> <b>and</b> <b>+8</b></span><span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><b>μC</b> <b>repel each other with a force of 40 N. If a charge of -5</b></span><span style=\"color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);\"><b>μC is added to each of them, then the force between then will become</b></span>","choices":[{"text":"-10 N","value":"A"},{"text":"+10 N","value":"B"},{"text":"+20 N","value":"C"},{"text":"-20 N","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123529,"question":"The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become","choices":[{"text":"7.20 N","value":"A"},{"text":"11.25 N","value":"B"},{"text":"22.50 N","value":"C"},{"text":"45.00","value":"D"},{"value":"E"}],"correctAnswer":2}]