Current electricity

[amp_mcq option1=”Length” option2=”Area of cross-section” option3=”Temperature” option4=”Resistivity” correct=”option2″]

Detailed SolutionThe resistance of a conductor varies inversely as

[amp_mcq option1=”Zero” option2=”Infinite” option3=”High but within tolerance” option4=”Low but not zero” correct=”option2″]

Detailed SolutionAn open resistor, when checked with an ohmmeter reads

[amp_mcq option1=”Magnitude and direction of current remains constant” option2=”Magnitude and direction of current changes with time” option3=”Magnitude of current changes with time” option4=”Magnitude of current remains constant” correct=”option1″]

Detailed SolutionIn the case of direct current

[amp_mcq option1=”5 joules” option2=”10 joules” option3=”15 joules” option4=”20 joules” correct=”option3″]

Detailed SolutionWhat will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal?

[amp_mcq option1=”Current through supply line flows at slower speed” option2=”Supply wiring is covered with insulation layer” option3=”Resistance of heater coil is more than the supply wires” option4=”Supply wires are made of superior material” correct=”option3″]

Detailed SolutionWhen current flows through heater coil it glows but supply wiring does not glow because

[amp_mcq option1=”One watt” option2=”One joule” option3=”Five joules” option4=”One joule second” correct=”option2″]

Detailed SolutionOne Newton meter is same as

[amp_mcq option1=”Resistance” option2=”Inductance” option3=”Capacitance” option4=”Impedance” correct=”option2″]

Detailed SolutionSparking occurs when a load is switched off because the circuit has high

[amp_mcq option1=”Elements have individual currents” option2=”Currents are additive” option3=”circuit? A. Elements have individual currents B. Currents are additive C. Voltages are additive” option4=”Power are additive” correct=”option3″]

Detailed SolutionWhich of the following statement is true both for a series and a parallel D.C. circuit?

[amp_mcq option1=”The current through each bulb in same” option2=”The voltage across each bulb is not same” option3=”The power dissipation in each bulb is not same” option4=”None of the above” correct=”option3″]

Detailed SolutionThe four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?

[amp_mcq option1=”Same current passes in turn through both” option2=”Both carry the same value of current” option3=”Total current equals the sum of branch currents” option4=”Sum of IR drops equals the applied e.m.f.” correct=”option2″]

Detailed SolutionTwo resistors are said to be connected in series when