[{"id":15578,"question":"A piece of fuse wire melts when a current of 15 ampere flows through it.With this current, if it dissipates 22.5 W. the resistance of fuse wire will be","choices":[{"text":"Zero","value":"A"},{"text":"10&nbsp;Ω","value":"B"},{"text":"1&nbsp;Ω","value":"C"},{"text":"0.10&nbsp;Ω","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15577,"question":"The conductivity of a superconductor is","choices":[{"text":"Infinite","value":"A"},{"text":"Very large","value":"B"},{"text":"Very small","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15576,"question":"If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in he form of heat will be","choices":[{"text":"0.1 watt","value":"A"},{"text":"1 &nbsp;watt","value":"B"},{"text":"10 watt","value":"C"},{"text":"100 watt","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15575,"question":"A 50-volt battery is connected across 10-ohm resistor.The current is 4.5 A.The internal resistance of the battery is","choices":[{"text":"Zero","value":"A"},{"text":"0.5&nbsp;Ω","value":"B"},{"text":"1.1&nbsp;Ω","value":"C"},{"text":"5.0&nbsp;Ω","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":15574,"question":"A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be","choices":[{"text":"64 W","value":"A"},{"text":"80 W","value":"B"},{"text":"100 W","value":"C"},{"text":"125 W","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":15573,"question":"Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then","choices":[{"text":"R<sub>1</sub> = 2R<sub>2</sub>","value":"A"},{"text":"<span style=\"font-size: 14.44444465637207px;\">R</span><sub>2</sub><span style=\"font-size: 14.44444465637207px;\">&nbsp;= 2R</span><sub>1</sub>","value":"B"},{"text":"<span style=\"font-size: 14.44444465637207px;\">R</span><sub>2</sub><span style=\"font-size: 14.44444465637207px;\">&nbsp;= 4R</span><sub>1</sub>","value":"C"},{"text":"<span style=\"font-size: 14.44444465637207px;\">R</span><sub>1</sub><span style=\"font-size: 14.44444465637207px;\">&nbsp;= 4R</span><sub>2</sub>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":15572,"question":"A ten-ohm electric heater operates on a 110 V line Calculate the rate at which it develops heat in watts:","choices":[{"text":"1310 W","value":"A"},{"text":"670 W","value":"B"},{"text":"810 W","value":"C"},{"text":"1210 W","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":15571,"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":15570,"question":"Two points 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":15569,"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 = Q","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":2}]