Electrical Work Power and Energy MCQ QUESTIONS ANSWERS Part1

Electrical Work Power and Energy MCQ JOB UNIVERSITY ADMISSION TEST QUESTIONS ANSWERS PART 1

• A kilowatt hour is the unit of energy.

• Heat Produced in a Conductor depends directly on time.

• If potential difference across a conductor of a material of resistivity Þ remains constant, then heat produced in the conductor is proportional to  1/ Þ.

• One kilowatt hour is equal to 36x10^5 J.

• The heater element in an electric iron is made of Nichrome.

• The heat produced (in k cals) in a resistance R ohms when a current I amperes flows through it for t seconds is given by  I^2Rt/4.2x10^3 .

• Three electric bulb 40W and 100 W are designed to work on a 220 V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains? Ans- 40 W.

• Two electric bulbs have tungsten filament of the same length. If one of them gives 60 W and the other 100 W, then--- 100 W bulb has thicker filament.

• Two electric lamps of 40 W each are connected in parallel. The power consumed by the combination is 80 W.

• The time required for  1kW heater to raise the temperature of 10 litres of water through 10 Degree Celsius is 420 Second.