Ohms Law Question & AnswersSeptember 13, 2021 By Wat Electrical Leave a Comment This article lists 100 Ohms law MCQs for Engineering Students. All the Ohms law Questions & Answers given below includes solution and link wherever possible to the relevant topic.Ohms law in the electrical field defines the relationship between current, resistance, and voltage of a specific circuit using the V=IR equation. This law states that whenever the current in the circuit increases, the value of resistance decreases or vice versa. Ohms law represents the voltage and current relationship as, if there is an increase in input voltage value the current in the circuit also increases in other terms voltage is directly proportional to current.Georg Ohms, a scientist has provided a solution with ohms law, for identifying the degree of current inside a conducting substance such as a vacuum tube in the year 1781. In the electrical field, there are different categories of substances, classified based on their physical and functioning properties like inductors, capacitors, and resistors. A conductor is a substance used for allowing the follow of current through the conducting material, whereas an inductor and capacitors are passive elements used for charging, circuit saving, and inducting purposes. Ohms law mainly depends on conducting substance and is measured in terms of ohms. The applications of ohms law are to find current, voltage, and resistance values, Assists in maintaining current, voltage, and resistance values, and applied in DC ammeters. 1). Which of the following law provides relationship between current, voltage and resistance?Newton’s lawOhms lawFaradays lawAll the aboveHintOhms law provides the relationship between current, voltage, and resistance. Read more about Relationship between Current, Voltage and Resistance. 2). Which of the following is the representation of Ohms law?V=IRV=I/RR=V/IBoth a and cHintThe representation of Ohms law is V=IR or R=V/I, where V= voltage, R=resistance, and I= current. 3). Which of the following is the purpose of Ohms law?Validates static type circuit based components valuesVoltage dropsCurrentAll the aboveHintThe purpose of Ohms law is to validate static type circuit-based components value, voltage drops, and supplies and current levels. 4). What happens to resistance according to ohms law, if current in the circuit increases?IncreasesDecreasesZeroInfinityHintThe value of resistance decreases according to ohms law if the current in the circuit increases. 5). What happens to voltage in the circuit according to ohms law when current increases?IncreasesDecreasesZeroInfinityHintThe voltage in the circuit according to ohms law is high when the current increases. 6). Which of the following might be the reason for increase in voltage value in a circuit?Poor connectionsPoor conductivity materialCorrosionAll the aboveHintThe reason for the increase in voltage value in a circuit might be due to poor connection, poor conductivity, and corrosion. Read more about Electrical Conductivity. 7). Voltage in circuit is measured as __units?VoltsAmperesOhmsFaradsHintVoltage in the circuit is measured as volts (V). 8). Current in circuit is measured as __units?VoltsAmperesOhmsFaradsHintCurrent in a circuit is measured as amperes (A). 9). Resistance in circuit is measured as __units?VoltsAmperesOhmsFaradsHintResistance in circuit is measured as Ohms (Ω). 10). If voltage in a circuit containing resistance of 6 ohms is 12volts. What is the value of current in the circuit?2A3A1.5A1.8AHintV=IR, I= V/R; I- 12/6 = 2A. 11). Find the value of resistance, If voltage in a circuit is 24V, and current flowing is 6A?3ohms4ohms5ohms2.5ohmsHintV=IR; R=V/I; where v=24V, i=6A; then R= 24/6 =4ohms. 12). Find the value of voltage in the circuit, if R=8ohms and I=5A.20V30V40V50VHintV=IR; if R=8ohms and I=5A then V= 5A*8ohms=40V. 13). In which year ohms law was got formulated?1920182718801997HintIn the year 1827 ohms law was got formulated. 14). What is the relation between voltage and current in ohms law?DirectlyIndirectlyUnequallyNone of the aboveHintThe voltage in ohms law is directly proportional to the current in the circuit. 15). Who named Ohms law?GeorgeHenryGeorg OhmDavidHintGeorge Ohm in 1827 formulated the relationship between current, voltage, and resistance in an electric circuit. 16). Ohms law uses ___ shaped polygon to explain relationship between current, voltage and resistance?SquareRectangleCircleTriangleHintOhms law uses a triangle-shaped polygon to explain the relationship between current, voltage, and resistance. 17). In an electric circuit, if resistance is 50 ohms, and flow of current is 3.2Amps. What is the value of voltage in the circuit?160V200V150V180VHintV=IR; V= 3.2*50=160V. 18). EMF of 8V is connected in series with an bulb, where the flow of current is 2.0 amps inside the circuit. Assuming wires used are resistance free. What is the actual value of resistance of the circuit.4ohms5ohms6ohms7ohmsHintR=V/I; R= 8/2=4ohms. 19). The rate at which an electric type charge is converted from electrical energy to mechanical or other forms of energy then it is represented as____Electric powerMechanical powerChemical energyMagnetic energyHintThe rate at which an electric type charge is converted from electrical energy to mechanical or other forms of energy then it is represented as electrical power. 20). Power is measured a _____ unitsVoltsMetersHenryWattsHintPower is measured as Watts. Read more about Power Factor. 21). What is the formula used for power according to ohms law?P=ViP=VIP=VNone of the aboveHintthe formula used for power according to ohms law is P=VI, where V= voltage and I=current. 22). What is the formula of power of circuit when voltage “V” and resistance “R” is given?P=V/RP=V2/rP=V2/RP=VPHintthe formula of power of circuit when voltage “V” and resistance “R” is given is P=V2/R. [ P=VI; V=IR;I=V/R; P=V2/R] 23). What is the formula of power of circuit when current and resistance is given?P=I2RP=IRP=I/RP=R/IHintThe formula of power of circuit when current and resistance is given is P=I2R[P=VI; V=IR; P=I2R] 24). What is the formula for “I” current when power “P” and resistance “R” is given?I=sqroot[P/R]I=R/PI=sqroot[R/P]I=PRHintThe formula for “I” current when power “P” and resistance “R” is given as I=sqroot[P/R]. 25). What is the formula for “I” current when power “P” and voltage “E” is given?I=P/EI=PEI=E/PI=Sqroot[PE]HintThe formula for “I” current when power “P” and voltage “E” is given as I=P/E.Ohm's Law Important MCQ's with Hints 26). What is the formula for “I” current when resistance “R” and voltage “E” is given?I=ERI=E/RI=R/EI=E-RHintThe formula for “I” current when resistance “R” and voltage “E” is given as I=E/R. 27). What is the value of voltage “V” when power “P” and resistance “R” is provide?V= RPV= sqroot[PR]V=R/PV=P/RHintThe value of voltage “V” when power “P” and resistance “R” is provided is V=sqroot[PR]. 28). What is the value of voltage “V” when power “P” and current “I” is provide?V= P/IV=PIV=P-IV=I-PHintThe value of voltage “V” when power “P” and current “I” is provided is V= P/I. 29). What is the value of voltage “V” when resistance “R” and current “I” is provide?V= IRV=I-RV=R-IV=I2RHintThe value of voltage “V” when resistance “R” and current “I” is provided is V=IR. 30). Which of the following are the applications of ohms law?Finds current, voltage and resistance valuesAssists in maintaining current, voltage and resistance valuesApplied in DC ammeterAll the aboveHintThe applications of ohms law is found current, voltage, and resistance values, Assists in maintaining current, voltage, and resistance values, and applied in DC ammeters. 31). Which of the following are the limitations of Ohms law?Linear electric propertyNon linear propertyDoes not support unilateral propertyBoth a and cHintThe limitations of Ohms law are it has nonlinear property and does not support unilateral property. 32). To which of the following substances ohms law is applicable?GermaniumIronGalliumSiliconHintOhms law is applicable for conducting substances such as Iron. 33). Which of the following is the major reason for ohms law not applicable for semiconducting substance?LinearityNon linearityHigh resistiveHigh voltageHintDue to semiconducting substance nonlinearity property ohms law is not applicable for semiconducting substance. 34). Which of the following are the components that holds for ohms law?ResistorsCapacitorsInductorsAll the aboveHintOhms law supports only resistor components in their circuit and not capacitors and inductors. 35). If an ohmic component behaves according to ohmic operating source then the device is called ___Ohmic resistorOhmic deviceOhmic conductorBoth a and bHintIf an ohmic component behaves according to the ohmic operating source then the device is called an Ohmic resistor or device. 36). In an ohmic connection, resistor in circuit can be connected in ____way according to power sourceSeriesParallelOpen circuitBoth a and bHintIn an ohmic connection, a resistor in the circuit can be connected either in parallel or in a series way according to a power source. 37). What is the equation called when inductors, capacitors or transmission lines are included in an AC circuit?ResistiveInductiveDifferentialIntegratingHintThe equation in which inductors, capacitors, or transmission lines are included in an AC circuit is called the differential equation. 38). What is the ohms “V, I” formula representation when time invariant components are used?Ae^(st)A/ Ae^(st)Ae^(st)HintOhms “V,I” formula representation when time-invariant components are used Ae^(st); where A is scalar, t is time and s is complex element. 39). ___ is called reciprocal of resistance?ImpedanceInductanceCapacitanceAll the aboveHintImpedance “z” is the reciprocal of resistance. 40). Which of the following are application of ohms law?ResistorsMetal conductorsInductorsBoth a and bHintApplication of ohms law includes resistors and metal conductors. Read more about Resistor. 41). What is the formula for defining the size of a resistor in ohms law?R= Pl/AR=P/AR=L/ANone of the aboveHintFormula for defining the size of a resistor in ohms law is R=Pl/A. Where R=resistance, P= materials resistivity, l=length and A= materials area. 42). For sufficient energy to flow what should be the length of the wire?LongShortMediumLargeHintFor sufficient energy to flow what should be the length of the wire should be long. 43). What is the value of kinetic energy when the length of the wire is long?IncreasesDecreasesSufficientZeroHintThe value of kinetic energy is sufficient when the length of the wire is long. 44). What is the value of resistance if length of wire increases?HighLowZeroInfinityHintThe value of resistance is high if the length of the wire increases. 45). What happens to resistance of wire when area is increased?IncreasesDecreasesInfinityZeroHintThe value of resistance of wire decreases when area is increased. 46). What is the value of temperature when resistance of wire increases for positive type te,perature coefficient?HighLowZeroInfinityHintThe value of temperature is high when the resistance of the wire increases for a positive type temperature coefficient. 47). What is the circuit named if resistor is connected in series with circuit components?Current divider networkVoltage divider networkCurrent sourceVoltage sourceHintWhen the resistor is connected in series with circuit components then the circuit is called the voltage divider network. 48). What is the circuit named if resistor is connected in parallel with circuit components?Current divider networkVoltage divider networkCurrent sourceVoltage sourceHintWhen the resistor is connected in parallel with circuit components then the circuit is called the current divider network. 49). Which of the following are the consideration to identify resistor value?Color codingType of resistorTerminals usedBoth a and bHintThe consideration to identify resistor value is color-coding. 50). Which of the following position of the resistors strip indicates its tolerance value?FirstSecondThirdBoth a and cHintThe third position of the resistors strip indicates its tolerance value.Ohm's Law MCQ's for Interviews 51). Which of the following is the method for finding resistors value?CodingColor codingMulti-meterBoth b and cHintThe method for finding resistors value is color-coding. 52). How many colors does the last strip on resistor can indicate its different tolerance value?5342HintThe last strip on a resistor can be indicated with 4 colors specifying 4 different tolerance values like gold, brown, red, and silver. 53). Which of the following is the tolerance value of brown color strip on resistor?+_1%+_2%+_5%+_10%HintThe tolerance value of the brown color strip on the resistor is +_1%. 54). Which of the following is the tolerance value of red color strip on resistor?+_1%+_2%+_5%+_10%HintThe tolerance value of red color strip on the resistor is +_2%. 55). Which of the following is the tolerance value of gold color strip on resistor?+_1%+_2%+_5%+_10%HintThe tolerance value of gold color strip on resistor is +_5%. 56). Which of the following is the tolerance value of silver color strip on resistor?+_1%+_2%+_5%+_10%HintThe tolerance value of silver color strip on resistor is +_10%. 57). How many terminals does a resistor have?2453HintA resistor has 2 terminals, either of the terminals can be represented as a positive or a negative terminal. 58). Which of the following band type resistors are used in electric based circuits?243Both b and cHintA 3 and 4 band type resistors are used in electric-based circuits. 59). Energy is measured in terms of ________.WattsJoulesOhmsFaradsHintEnergy is measured in terms of joules. 60). Which of the following is the formula for energy?E=P*TE=P/TE=T/PE=THintThe formula for energy is E=P*T, where E=energy, P=power, and T=time. 61). If the 100watts bulb is turned on for 1day, and energy consumed is 8,640,000 J, calculate energy.8.64MJ8MJ8.4MJ8.5MJHintIf the 100watts bulb is turned on for 1day, and energy consumed is 8,640,000 J. then energy E= 8.64MJ. 62). A resistor is a _______ element.ActivePassiveIndependentBoth a and bHintA resistor is a passive element as it depends on external power source. 63). What happens to magnitude of resistance when voltage drop increases, when current flows through a resistor?IncreasesDecreasesZeroInfinityHintThe magnitude of resistance increases when voltage drop increases when current flows through a resistor. 64). Which of the following are non ohmic substances?CapacitorsResistorsInductorsBoth a and cHintBoth capacitors and inductors are nonohmic substances. 65). If the voltage drop across a 1ohm resistor is 10V and 100V. Find the value of current through the resistor.90A80A100A70AHintIf the voltage drop across a 1ohm resistor is 10V and 100V. Then current I= V/R= [100-10]/1=90Amps. 66). Which of the following condition blocks a resistor to dissipate it capacitated power?DeratingPower ratingTime of rateNone of the aboveHintDerating condition blocks a resistor to dissipate its capacitated power. 67). What is the power rating resistors value?¼½1/8Both a and cHintThe power rating resistors value is either ¼ or 1/8 watts. 68). Which of the following is minimal based resistors power rating?0.50.60.70.8HintThe minimal based resistors power rating resistors value is 0.5W. 69. An electric type heater or a resistor consumes 1KW, supplied with 8A. Find the value of voltage?125V120V121V130VHintV=P/I; V= 1000/8 =125V. 70). Resistors are of ____ types?2345HintResistors are of 2 types, variable and fixed. 71). Which of the following are variable resistors?PotentiometerRheostatTrimpotAll the aboveHintVariable resistors include potentiometer, rheostat and trimpot. Read more about Variable Resistor. 72). Which of the following is the tolerance value of carbon filmed fixed resistor?2-10%2-5%1-5%0.1-6%Hintthe tolerance value of carbon filmed fixed resistor is 2-10%. 73). Which of the following filmed fixed resistor have a tolerance value of 0.1-5%?Surface mountedMetalWire woundAll the aboveHintA surface, metal, and wire wound-based filmed fixed resistor have a tolerance value of 0.1-5%. 74). Which of the following filmed resistors have power rating of 10W?CarbonSurface mountedMetalWire woundHintA wire-wound filmed resistors have a power rating of 10W. 75). Which of the following filmed resistors have power rating of 0.1W?CarbonSurface mountedMetalWire woundHintA surface mounted filmed resistors have power rating of 0.1W. 76). Which of the following filmed resistors have power rating of ¼ W?CarbonSurface mountedMetalBoth a and cHintCarbon and metal mounted filmed resistors have a power rating of 1/4W.Ohm's Law Questions and Answers 77). Which of the following filmed resistors have temperature coefficient of 450ppm/K?CarbonSurface mountedMetalWire woundHintA carbon-mounted filmed resistors have a temperature coefficient of 450ppm/K. 78). Which of the following filmed resistors have temperature coefficient of 50ppm/K?CarbonSurface mountedMetalWire woundHintA metal mounted filmed resistors have temperature coefficient of 50ppm/K. 79). Which of the following filmed resistors have temperature coefficient of 450ppm/K?CarbonSurface mountedWire woundBoth b and cHintA carbon and wire wounded filmed resistors have a temperature coefficient of 450ppm/K. 80). Which of the following filmed resistors have temperature coefficient of 100ppm/K?CarbonSurface mountedWire woundBoth b and cHintA surface mounted filmed resistors have temperature coefficient of 100ppm/K. 81). Fixed type resistors are represented using __ standard.IECANSIASCIINone of the aboveHintFixed type resistors are represented using “IEC- International Electromechanical Commission” standard. 82). Variable type resistors are represented using __ standard?IECANSIASCIINone of the aboveHintVariable type resistors are represented using “ANSI- American National Standards Institute”. 83). A potentiometer is used for generating _______.CurrentVoltageResistanceAll the aboveHintA potentiometer is used for generating voltage. 84). A potentiometer acts as _____.Current dividerVoltage dividerResistance dividerBoth a and cHintA potentiometer acts as a resistance divider. 85). Which of the following are the applications of potentiometer?AmplifierDistance measurementCircuits tuningAll the aboveHintThe applications of the potentiometer are amplifier, distance measurement, and circuit tuning. 86). Trimpots are also called as ______.Trimmer potentiometerTrimmer calibratorsTrimmer packetsAll the aboveHintTrimpots are also called trimmer potentiometers. 87). A rheostats is a ____.Current dividerVoltage dividerResistance dividerBoth a and cHintA rheostat is a voltage or potential divider. Read more about Rheostat. 88). A rheostat has ___ resistance.EqualZeroVariableconstantHintA rheostat has variable resistance. 89). How many terminals do a rheostat have _____?2345HintA rheostat has 2 terminals. 90). How many terminals do a potentiometer has___?2345HintA potentiometer has 3 terminals. 91). A digital type resistor is ____Fixed resistorVariable resistorBoth a and bConstant resistorHintA digital type resistor is a variable type resistor. 92). A digital type resistor changes its resistance value using ___Digital updatingMechanical updatingElectrical updatingBoth a and cHintA digital type resistor changes its resistance value using digital and electrical type updating. 93). The value of resistance in variable type resistor changes is updated as _____ functionDiscreteContinuousPeriodicBoth a and cHintThe value of resistance in variable type resistor changes is updated as discrete function. 94). Which of the following type of protocol is used in variable type resistor?I2CUp/down counterSPIBoth a and bHintI2C and Up./down type clock counter protocol is used in variable type resistor for changing the value of resistance. 95). Which of the following type of resistor whose resistance depends on value of temperature?ThermistorPhoto resistorVaristorAll the aboveHintA thermistor type of resistor whose resistance depends on the value of temperature. Read more about Thermistor. 96). Which of the following type of resistor whose resistance depends on function of level of light?ThermistorPhoto resistorVaristorAll the aboveHintA photoresistor type of resistor whose resistance depends on the function of the level of light. 97). Which of the following type of resistor whose resistance depends on function of level of voltage?ThermistorPhoto resistorVaristorAll the aboveHintA Varistor is a type of resistor whose resistance depends on the function of the level of voltage. Read more about Varistor. 98). Which of the following type of resistor whose resistance depends on function of magnetic field?ThermistorPhoto resistorVaristorMagneto resistorHintA Magneto resistor is a type of resistor whose resistance depends on magnetic field. 99). Which of the following type of resistor whose resistance depends on function of mechanical type load?ThermistorStrain gaugesVaristorMagneto resistorHintA Strain gauge is a type of resistor whose resistance depends on mechanical type load. 100). Which of the following are the materials used for manufacturing resistor?FoilCarbon filmMetal filmAll the aboveHintThe materials used for manufacturing resistor is foil, carbo film, and metal film. Time is Up! Time's up
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