Ohms Law Question & Answers September 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 law Ohms law Faradays law All the above Hint Read more about Relationship between Current, Voltage and Resistance. 2). Which of the following is the representation of Ohms law? V=IR V=I/R R=V/I Both a and c Hint 3). Which of the following is the purpose of Ohms law? Validates static type circuit based components values Voltage drops Current All the above Hint 4). What happens to resistance according to ohms law, if current in the circuit increases? Increases Decreases Zero Infinity Hint 5). What happens to voltage in the circuit according to ohms law when current increases? Increases Decreases Zero Infinity Hint 6). Which of the following might be the reason for increase in voltage value in a circuit? Poor connections Poor conductivity material Corrosion All the above Hint Read more about Electrical Conductivity. 7). Voltage in circuit is measured as __units? Volts Amperes Ohms Farads Hint 8). Current in circuit is measured as __units? Volts Amperes Ohms Farads Hint 9). Resistance in circuit is measured as __units? Volts Amperes Ohms Farads Hint 10). If voltage in a circuit containing resistance of 6 ohms is 12volts. What is the value of current in the circuit? 2A 3A 1.5A 1.8A Hint 11). Find the value of resistance, If voltage in a circuit is 24V, and current flowing is 6A? 3ohms 4ohms 5ohms 2.5ohms Hint 12). Find the value of voltage in the circuit, if R=8ohms and I=5A. 20V 30V 40V 50V Hint 13). In which year ohms law was got formulated? 1920 1827 1880 1997 Hint 14). What is the relation between voltage and current in ohms law? Directly Indirectly Unequally None of the above Hint 15). Who named Ohms law? George Henry Georg Ohm David Hint 16). Ohms law uses ___ shaped polygon to explain relationship between current, voltage and resistance? Square Rectangle Circle Triangle Hint 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? 160V 200V 150V 180V Hint 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. 4ohms 5ohms 6ohms 7ohms Hint 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 power Mechanical power Chemical energy Magnetic energy Hint 20). Power is measured a _____ units Volts Meters Henry Watts Hint Read more about Power Factor. 21). What is the formula used for power according to ohms law? P=Vi P=VI P=V None of the above Hint 22). What is the formula of power of circuit when voltage “V” and resistance “R” is given? P=V/R P=V2/r P=V2/R P=VP Hint 23). What is the formula of power of circuit when current and resistance is given? P=I2R P=IR P=I/R P=R/I Hint 24). What is the formula for “I” current when power “P” and resistance “R” is given? I=sqroot[P/R] I=R/P I=sqroot[R/P] I=PR Hint 25). What is the formula for “I” current when power “P” and voltage “E” is given? I=P/E I=PE I=E/P I=Sqroot[PE] Hint 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=ER I=E/R I=R/E I=E-R Hint 27). What is the value of voltage “V” when power “P” and resistance “R” is provide? V= RP V= sqroot[PR] V=R/P V=P/R Hint 28). What is the value of voltage “V” when power “P” and current “I” is provide? V= P/I V=PI V=P-I V=I-P Hint 29). What is the value of voltage “V” when resistance “R” and current “I” is provide? V= IR V=I-R V=R-I V=I2R Hint 30). Which of the following are the applications of ohms law? Finds current, voltage and resistance values Assists in maintaining current, voltage and resistance values Applied in DC ammeter All the above Hint 31). Which of the following are the limitations of Ohms law? Linear electric property Non linear property Does not support unilateral property Both a and c Hint 32). To which of the following substances ohms law is applicable? Germanium Iron Gallium Silicon Hint 33). Which of the following is the major reason for ohms law not applicable for semiconducting substance? Linearity Non linearity High resistive High voltage Hint 34). Which of the following are the components that holds for ohms law? Resistors Capacitors Inductors All the above Hint 35). If an ohmic component behaves according to ohmic operating source then the device is called ___ Ohmic resistor Ohmic device Ohmic conductor Both a and b Hint 36). In an ohmic connection, resistor in circuit can be connected in ____way according to power source Series Parallel Open circuit Both a and b Hint 37). What is the equation called when inductors, capacitors or transmission lines are included in an AC circuit? Resistive Inductive Differential Integrating Hint 38). What is the ohms “V, I” formula representation when time invariant components are used? Ae^(st) A/ Ae^(st) A e^(st) Hint 39). ___ is called reciprocal of resistance? Impedance Inductance Capacitance All the above Hint 40). Which of the following are application of ohms law? Resistors Metal conductors Inductors Both a and b Hint Read more about Resistor. 41). What is the formula for defining the size of a resistor in ohms law? R= Pl/A R=P/A R=L/A None of the above Hint 42). For sufficient energy to flow what should be the length of the wire? Long Short Medium Large Hint 43). What is the value of kinetic energy when the length of the wire is long? Increases Decreases Sufficient Zero Hint 44). What is the value of resistance if length of wire increases? High Low Zero Infinity Hint 45). What happens to resistance of wire when area is increased? Increases Decreases Infinity Zero Hint 46). What is the value of temperature when resistance of wire increases for positive type te,perature coefficient? High Low Zero Infinity Hint 47). What is the circuit named if resistor is connected in series with circuit components? Current divider network Voltage divider network Current source Voltage source Hint 48). What is the circuit named if resistor is connected in parallel with circuit components? Current divider network Voltage divider network Current source Voltage source Hint 49). Which of the following are the consideration to identify resistor value? Color coding Type of resistor Terminals used Both a and b Hint 50). Which of the following position of the resistors strip indicates its tolerance value? First Second Third Both a and c Hint Ohm's Law MCQ's for Interviews 51). Which of the following is the method for finding resistors value? Coding Color coding Multi-meter Both b and c Hint 52). How many colors does the last strip on resistor can indicate its different tolerance value? 5 3 4 2 Hint 53). Which of the following is the tolerance value of brown color strip on resistor? +_1% +_2% +_5% +_10% Hint 54). Which of the following is the tolerance value of red color strip on resistor? +_1% +_2% +_5% +_10% Hint 55). Which of the following is the tolerance value of gold color strip on resistor? +_1% +_2% +_5% +_10% Hint 56). Which of the following is the tolerance value of silver color strip on resistor? +_1% +_2% +_5% +_10% Hint 57). How many terminals does a resistor have? 2 4 5 3 Hint 58). Which of the following band type resistors are used in electric based circuits? 2 4 3 Both b and c Hint 59). Energy is measured in terms of ________. Watts Joules Ohms Farads Hint 60). Which of the following is the formula for energy? E=P*T E=P/T E=T/P E=T Hint 61). If the 100watts bulb is turned on for 1day, and energy consumed is 8,640,000 J, calculate energy. 8.64MJ 8MJ 8.4MJ 8.5MJ Hint 62). A resistor is a _______ element. Active Passive Independent Both a and b Hint 63). What happens to magnitude of resistance when voltage drop increases, when current flows through a resistor? Increases Decreases Zero Infinity Hint 64). Which of the following are non ohmic substances? Capacitors Resistors Inductors Both a and c Hint 65). If the voltage drop across a 1ohm resistor is 10V and 100V. Find the value of current through the resistor. 90A 80A 100A 70A Hint 66). Which of the following condition blocks a resistor to dissipate it capacitated power? Derating Power rating Time of rate None of the above Hint 67). What is the power rating resistors value? ¼ ½ 1/8 Both a and c Hint 68). Which of the following is minimal based resistors power rating? 0.5 0.6 0.7 0.8 Hint 69. An electric type heater or a resistor consumes 1KW, supplied with 8A. Find the value of voltage? 125V 120V 121V 130V Hint 70). Resistors are of ____ types? 2 3 4 5 Hint 71). Which of the following are variable resistors? Potentiometer Rheostat Trimpot All the above Hint 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% Hint 73). Which of the following filmed fixed resistor have a tolerance value of 0.1-5%? Surface mounted Metal Wire wound All the above Hint 74). Which of the following filmed resistors have power rating of 10W? Carbon Surface mounted Metal Wire wound Hint 75). Which of the following filmed resistors have power rating of 0.1W? Carbon Surface mounted Metal Wire wound Hint 76). Which of the following filmed resistors have power rating of ¼ W? Carbon Surface mounted Metal Both a and c Hint Ohm's Law Questions and Answers 77). Which of the following filmed resistors have temperature coefficient of 450ppm/K? Carbon Surface mounted Metal Wire wound Hint 78). Which of the following filmed resistors have temperature coefficient of 50ppm/K? Carbon Surface mounted Metal Wire wound Hint 79). Which of the following filmed resistors have temperature coefficient of 450ppm/K? Carbon Surface mounted Wire wound Both b and c Hint 80). Which of the following filmed resistors have temperature coefficient of 100ppm/K? Carbon Surface mounted Wire wound Both b and c Hint 81). Fixed type resistors are represented using __ standard. IEC ANSI ASCII None of the above Hint 82). Variable type resistors are represented using __ standard? IEC ANSI ASCII None of the above Hint 83). A potentiometer is used for generating _______. Current Voltage Resistance All the above Hint 84). A potentiometer acts as _____. Current divider Voltage divider Resistance divider Both a and c Hint 85). Which of the following are the applications of potentiometer? Amplifier Distance measurement Circuits tuning All the above Hint 86). Trimpots are also called as ______. Trimmer potentiometer Trimmer calibrators Trimmer packets All the above Hint 87). A rheostats is a ____. Current divider Voltage divider Resistance divider Both a and c Hint Read more about Rheostat. 88). A rheostat has ___ resistance. Equal Zero Variable constant Hint 89). How many terminals do a rheostat have _____? 2 3 4 5 Hint 90). How many terminals do a potentiometer has___? 2 3 4 5 Hint 91). A digital type resistor is ____ Fixed resistor Variable resistor Both a and b Constant resistor Hint 92). A digital type resistor changes its resistance value using ___ Digital updating Mechanical updating Electrical updating Both a and c Hint 93). The value of resistance in variable type resistor changes is updated as _____ function Discrete Continuous Periodic Both a and c Hint 94). Which of the following type of protocol is used in variable type resistor? I2C Up/down counter SPI Both a and b Hint 95). Which of the following type of resistor whose resistance depends on value of temperature? Thermistor Photo resistor Varistor All the above Hint Read more about Thermistor. 96). Which of the following type of resistor whose resistance depends on function of level of light? Thermistor Photo resistor Varistor All the above Hint 97). Which of the following type of resistor whose resistance depends on function of level of voltage? Thermistor Photo resistor Varistor All the above Hint Read more about Varistor. 98). Which of the following type of resistor whose resistance depends on function of magnetic field? Thermistor Photo resistor Varistor Magneto resistor Hint 99). Which of the following type of resistor whose resistance depends on function of mechanical type load? Thermistor Strain gauges Varistor Magneto resistor Hint 100). Which of the following are the materials used for manufacturing resistor? Foil Carbon film Metal film All the above Hint Time is Up! Time's up
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