[{"id":146093,"question":"A wire of radius r has resistance R, It it is stretched to a wire of r/2 radius, then the resistance becomes","choices":[{"text":"2R","value":"A"},{"text":"4R","value":"B"},{"text":"16R","value":"C"},{"text":"Zero","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146092,"question":"Two electric bulbs of 200 W and 100 W have same voltage. If R<sub>1</sub>and R<sub>2</sub>be their resistance respectively then","choices":[{"text":"R<sub>1</sub>=2R<sub>2</sub>","value":"A"},{"text":"R<sub>2</sub>=2R<sub>1</sub>","value":"B"},{"text":"R<sub>2</sub>=4R<sub>1</sub>","value":"C"},{"text":"R<sub>1</sub>=4R<sub>2</sub>","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146091,"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":146090,"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":146089,"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":146088,"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},{"id":146087,"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":146086,"question":"In a Millikan'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":146085,"question":"The force between two charges 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":1},{"id":146084,"question":"What is the average energy of N molecules of monoatomic gas?","choices":[{"text":"1/2 NKT","value":"A"},{"text":"NKT","value":"B"},{"text":"3/2 NKT","value":"C"},{"text":"5/2 NKT","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146083,"question":"At 0<b style=\"color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;\">°</b>K which of the following properties of a gas will be zero?","choices":[{"text":"Kinetic energy","value":"A"},{"text":"Potential energy","value":"B"},{"text":"Vibrational energy","value":"C"},{"text":"Density","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146082,"question":"The product of the pressure and volume of an ideal gas is","choices":[{"text":"A constant","value":"A"},{"text":"Approximately equal to the universal gas constant","value":"B"},{"text":"Directly proportional to its temperature","value":"C"},{"text":"Inversely proportional to its temperature","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":146081,"question":"Boyle's law is applicable in","choices":[{"text":"Isochoric process","value":"A"},{"text":"Isothermal process","value":"B"},{"text":"Isobaric process","value":"C"},{"text":"Isotonic process","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":146080,"question":"Absolute temperature can be calculated by","choices":[{"text":"Mean square velocity","value":"A"},{"text":"Motion of the molecule","value":"B"},{"text":"Both A and B","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":146079,"question":"Which of the following is not thermo dynamical function?","choices":[{"text":"Enthalpy","value":"A"},{"text":"Work done","value":"B"},{"text":"Gibb's energy","value":"C"},{"text":"Internal energy","value":"D"},{"value":"E"}],"correctAnswer":2}]