Basic Electrical Mcqs

1.Which of the following is equivalent to one newton meter?

One wattOne jouleFive joulesOne joule-second

2.What is the equivalent of 1 angstrom in meters?

10^-8 millimeters10^-6 centimeters10^-10 meters10^-14 meters

3.Conductance is measured in mhos. Which of the following pairs shows a quantity and its correct unit in a similar manner?

Resistance : ohmCapacitance : henryInductance : faradLuminous flux : steradian

4.Which of the following materials exhibits a negative temperature coefficient?

5.If a voltage of 1 volt causes a current of 1 microampere to pass through a circuit, what is the conductance of that circuit?

1 nanomho106 mhos1 millimhoNone of these

6.Nichrome wire is primarily composed of which two metals?

zinc and leadvanadium and chromiumnickel and chromiumsilver and copper

7.Given that I represents current, R denotes resistance, and t stands for time, according to Joule's law, the heat generated is directly proportional to which of the following expressions?

I squared multiplied by R and tI squared times R and fI squared times R squared and tI squared multiplied by R squared and t

8.What type of temperature coefficient does a thermistor exhibit?

9.If three resistors are connected in parallel and each resistor dissipates 20 watts, what is the total power delivered by the voltage source?

10.How many electrons are present in the outermost shell of a carbon atom?

11.What is the approximate ratio of the proton's mass compared to the electron's mass?

12.What is the primary application of voltage-dependent resistors?

In inductive circuit applicationsTo protect against voltage surgesUsed as components for generating heatTo maintain constant current flow

13.Voltage-dependent resistors are commonly manufactured using which material?

14.Which property is typically high in all excellent conductors?

conductanceresistancereluctancethermal conductivity

15.What are substances called that exhibit electrical conductivity significantly lower than most metals but considerably higher than standard insulators?

Voltage-dependent resistorsTemperature-sensitive resistorsSemiconductorsAdjustable resistors

16.What reading does an ohmmeter display when measuring a resistor that is open circuit?

Zero ohmsInfinite resistanceElevated resistance within acceptable limitsReduced resistance but not zero

17.In what way does a rheostat differ from a potentiometer?

Possesses a lower power ratingFeatures a greater power ratingContains more winding turnsProvides numerous tapping points

18.Which of the following statements accurately describes a semiconductor?

A semiconductor is a material with electrical conductivity between that of a conductor and an insulator.A semiconductor has conductivity equal to the average of a metal and an insulator.A semiconductor only allows half of the applied voltage to pass through.A semiconductor consists of alternating layers of conductive and insulating materials.

19.What is the necessary condition for Ohm’s law to hold true?

The resistance should remain constant throughout.The current must vary directly with the magnitude of the resistance.The resistance needs to be of the wire-wound variety.The temperature at the positive terminal must exceed that at the negative terminal.

20.Why does the heater coil emit light when current passes through it, while the supply wires do not glow?

The current moves more slowly through the supply wiresThe supply wires are insulated with a protective coveringThe heater coil has a higher resistance compared to the supply wiresThe supply wires are constructed from better quality materials