Current electricity

[amp_mcq option1=”The voltage across the resistor is A. 33 V” option2=”66 V” option3=”80 V” option4=”132 V” correct=”option1″]

Detailed SolutionIn a circuit a 33 Ohm resistor carries a current of 2

[amp_mcq option1=”Compounds of silver” option2=”Liquid metals” option3=”Metallic alloys” option4=”Electrolytes” correct=”option4″]

Detailed SolutionWhich of the following can have negative temperature coefficient?

[amp_mcq option1=”Cast iron” option2=”Copper” option3=”Carbon” option4=”Tungsten” correct=”option2″]

Detailed SolutionOut of the following which is not a poor conductor?

[amp_mcq option1=”1.2 x 10-8 $$\Omega $$-m” option2=”1.4 x 10-8 $$\Omega $$-m” option3=”1.6 x 10-8 $$\Omega $$-m” option4=”1.8 x 10-8 $$\Omega $$-m” correct=”option4″]

Detailed SolutionThe resistance of a copper wire 200 m long is 21 $$\Omega .$$ If its thickness (diameter) is 0.44 mm, its specific resistance is around

[amp_mcq option1=”Reactor” option2=”Capacitor” option3=”or” option4=”Resistor” correct=”option4″]

Detailed SolutionWhether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

[amp_mcq option1=”Decreases” option2=”Increases” option3=”Remains same” option4=”None of the above” correct=”option2″]

Detailed SolutionResistance of a tungsten lamp as applied voltage increases

[amp_mcq option1=”1840″ option2=”1480″ option3=”30″ option4=”4″ correct=”option1″]

Detailed SolutionThe ratio of mass of proton to that of electron is nearly

[amp_mcq option1=”Increases” option2=”Decreases” option3=”Remains same” option4=”None of the above” correct=”option2″]

Detailed SolutionIn a lamp load when more than one lamp are switched on the total resistance of the load

[amp_mcq option1=”Copper” option2=”Gold” option3=”Silver” option4=”Paper” correct=”option4″]

Detailed SolutionOut of the following which is an insulating material?