[{"id":123618,"question":"A 10 F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference becomes 20 volt.The capacitance of second capacitor is","choices":[{"text":"10μF","value":"A"},{"text":"20μF","value":"B"},{"text":"30μF","value":"C"},{"text":"15μF","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123617,"question":"A certain charge liberates 0.8 g of oxygen. The same charge will liberate. how many g of silver?","choices":[{"text":"108 g","value":"A"},{"text":"10.8 g","value":"B"},{"text":"0.8 g","value":"C"},{"text":"108/0.8 g","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123615,"question":"In a voltmeter the conduction takes place due to","choices":[{"text":"Electrons only","value":"A"},{"text":"Holes only","value":"B"},{"text":"Electrons and holes","value":"C"},{"text":"Electrons and ions","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123614,"question":"A conducting wire is drawn to double its length. Final resistivity of the material will be","choices":[{"text":"Double of the original one","value":"A"},{"text":"Half of the original one","value":"B"},{"text":"One fourth of the original one","value":"C"},{"text":"Same as original one","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123613,"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":"10Ω","value":"B"},{"text":"1Ω","value":"C"},{"text":"0.10Ω","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123610,"question":"If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be","choices":[{"text":"0.1 watt","value":"A"},{"text":"1 watt","value":"B"},{"text":"10 watt","value":"C"},{"text":"100 watt","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123605,"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":123604,"question":"If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be","choices":[{"text":"0.1 watt","value":"A"},{"text":"1 watt","value":"B"},{"text":"10 watt","value":"C"},{"text":"100 watt","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123602,"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":"0.5Ω","value":"B"},{"text":"1.1Ω","value":"C"},{"text":"5.0Ω","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123598,"question":"A (100 W , 200 W) 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":123596,"question":"A wire of radius r has resistance R. If 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":123595,"question":"Two electric bulbs of 200 W and 100 W have same voltage. If R1and R2be their resistance respectively then","choices":[{"text":"R1= 2R2","value":"A"},{"text":"R2= 2R1","value":"B"},{"text":"R2 = 4R1","value":"C"},{"text":"R1= 4R2","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123594,"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":123591,"question":"","questionImage":"123591_636349367125018827-RQ.jpg","choices":[{"text":"5μF","value":"A"},{"text":"10μF","value":"B"},{"text":"3μF","value":"C"},{"text":"6μF","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123588,"question":"Taking the earth to be a spherical conductor of diameter 12.8 x 103km. Its capacity will be","choices":[{"text":"711μF","value":"A"},{"text":"611μF","value":"B"},{"text":"811μF","value":"C"},{"text":"511μF","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123587,"question":"The nature of capacity of electrostatic capacitor depends on","choices":[{"text":"Shape","value":"A"},{"text":"Size","value":"B"},{"text":"Thickness of plates","value":"C"},{"text":"Area","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123586,"question":"A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor","choices":[{"text":"Increases","value":"A"},{"text":"Decreases","value":"B"},{"text":"Remain unchanged","value":"C"},{"text":"Becomes infinite","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123585,"question":"The energy required to charge a capacitor of 5μF by connecting D.C. source of 20 KV is","choices":[{"text":"10 KJ","value":"A"},{"text":"5 KJ","value":"B"},{"text":"2 KJ","value":"C"},{"text":"1 KJ","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123584,"question":"When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates","choices":[{"text":"Decreases","value":"A"},{"text":"Increases","value":"B"},{"text":"No change","value":"C"},{"text":"May increase or decresase","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123583,"question":"A capacitor of capacity 1μF is charged to 1 KV. The energy stored in J","choices":[{"text":"5","value":"A"},{"text":"0.5","value":"B"},{"text":"0.005","value":"C"},{"text":"50","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123582,"question":"If the distance between the plates of a parallel plate condenser of capacity 10μF is doubled then new capacity will be","choices":[{"text":"5μF","value":"A"},{"text":"20μF","value":"B"},{"text":"10μF","value":"C"},{"text":"15μF","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123581,"question":"The capacity of a parallel plat capacitor depends on the","choices":[{"text":"Type to metal used","value":"A"},{"text":"Thickness of plates","value":"B"},{"text":"Potential applied across the plates","value":"C"},{"text":"Separation between the plates","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123580,"question":"In a charged capacitor the energy is stored in","choices":[{"text":"Both in positive and negative charges","value":"A"},{"text":"Positive charges","value":"B"},{"text":"The edges of the capacitor plates","value":"C"},{"text":"The electric field between the plates","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123579,"question":"A condenser of capacity 50μF is charged to 10 V.The energy stored is","choices":[{"text":"1.25 x 10-3J","value":"A"},{"text":"3.75 x 10-3J","value":"B"},{"text":"2.5 x 10-3J","value":"C"},{"text":"5 x 10-3J","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":123578,"question":"A metal plate of thickness half the separation between the capacitor plates of capacitance C is inserted. The new capacitance is","choices":[{"text":"C","value":"A"},{"text":"C/2","value":"B"},{"text":"Zero","value":"C"},{"text":"2C","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":123577,"question":"A one microfarad capacitor of a TV is subjected to 4000 V potential difference. The energy stored in capacitor is","choices":[{"text":"8 J","value":"A"},{"text":"16 J","value":"B"},{"text":"4 x 10-3J","value":"C"},{"text":"2 x 10-3J","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123576,"question":"A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser. As a result its capcitance","choices":[{"text":"Increase k time","value":"A"},{"text":"Decreases k times","value":"B"},{"text":"Decreases 1/K times","value":"C"},{"text":"Remains unchanged","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123575,"question":"Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become","choices":[{"text":"Zero","value":"A"},{"text":"F/2","value":"B"},{"text":"F","value":"C"},{"text":"2F","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":123574,"question":"A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. The quantity that remains unchanged is","choices":[{"text":"Charge Q","value":"A"},{"text":"Potential V","value":"B"},{"text":"Capacity","value":"C"},{"text":"Energy U","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":123573,"question":"If we increase the distance between two plates of the capacitor, the capacitance will","choices":[{"text":"Increase","value":"A"},{"text":"Decrease","value":"B"},{"text":"Remain same","value":"C"},{"text":"First increase then decrease","value":"D"},{"value":"E"}],"correctAnswer":2}]