Kirchhoff's Laws & Network Analysis — Practice Questions

Free NEET Physics multiple-choice questions on Kirchhoff's Laws & Network Analysis. Attempt each question and reveal the answer with a full explanation.

A battery of 20 V is connected to three resistors 5 , 10 , and 20 in series. The potential drop across the 10 resistor is: 5.71 V 10 V 4 V 2 V Which of the following physical quantities is a vector? Current density Electric current Resistance Electromotive force The unit of 'Figure of Merit' of a galvanometer is: Ampere per division Division per Ampere Ohm per division Volt per division A galvanometer of resistance G is shunted by a resistance S . The fraction of the total current that passes through the galvanometer is: S / (G + S) G / (G + S) S / G G / S The resistance of a galvanometer is 100 . A shunt of 5 is connected to it to convert it into an ammeter. The internal resistance of the ammeter is: 4.76 5.25 105 95 In a Wheatstone bridge, all the four arms have equal resistance R . If the resistance of the galvanometer arm is also R , the equivalent resistance of the combination as seen by the battery is: R R/2 2R 4R Kirchhoff's loop rule is a direct consequence of: Conservation of energy Conservation of charge Conservation of momentum Conservation of mass The resistance of an ideal ammeter and an ideal voltmeter are respectively: Zero, Infinite Infinite, Zero Zero, Zero Infinite, Infinite The power dissipated in the circuit shown in the figure is 30 Watts . The value of R is: 10 20 5 15 In the circuit shown, the current through the 4 resistor is: 0.5 A 1.0 A 2.0 A 0.25 A A potential divider is used to give outputs of 2 V and 3 V from a 5 V source. Which combination of resistors in series would achieve this? 2 , 1 , 2 3 , 2 , 5 1 , 1 , 1 2 , 3 , 5 Five identical resistors, each of resistance R , are connected in series to form a shape of the letter 'W'. The equivalent resistance between the two free end points of the wire is: 5R R/5 2.5R R Two batteries of EMF 4 V and 8 V with internal resistances 1 and 2 are connected in a circuit with a resistance of 9 as shown in the figure. The current and direction of flow of current are: 1/3 A from A to B through E2 1/3 A from B to A through E2 1/2 A from A to B through E2 1/2 A from B to A through E2 In a circuit, the KVL (Kirchhoff's Voltage Law) is mathematically expressed as V = 0 . This law follows from: Conservative nature of electrostatic field Conservation of mass Conservation of momentum Non-conservative nature of electric field Three resistors of 10 , 15 , and 30 are connected in parallel. This combination is connected in series with a 10 resistor and a 15 V battery. The current through the 15 resistor is: 0.33 A 0.5 A 1.0 A 0.2 A The current I drawn from a 5 V battery in the given network is: 0.5 A 0.1 A 2 A 1 A Three identical resistors R 1, R 2, R 3 are connected to a battery. R 1 is in series with the parallel combination of R 2 and R 3 . If the power dissipated in R 1 is P 1 and in R 2 is P 2 , then the ratio P 1/P 2 is: 4 2 1/2 1/4 The current flowing through the 3 resistor in the given circuit is: 0.8 A 0.6 A 1.2 A 1.0 A In the junction network shown in the figure, what is the magnitude and direction of the current I ? 3 A , leaving the junction 3 A , entering the junction 5 A , leaving the junction 1 A , entering the junction In the circuit shown, all resistors are 5 . The equivalent resistance between points A and B is: 5 10 2.5 20 What is the equivalent resistance between points A and B in the following circuit if each resistor is R ? R/2 R 2R 3R/2 Twelve identical resistors each of resistance R are joined to form a skeleton cube. The equivalent resistance between the diagonally opposite corners (body diagonal) of the cube is: 5 6 R 3 4 R 7 12 R 1 2 R In the circuit shown, the potential difference across the 4 resistor is: 8 V 4 V 12 V 2 V An infinite ladder network is constructed with 1 and 2 resistors as shown. The effective resistance between points A and B is: 2 1.5 3 1 Twelve resistors, each of resistance R , are connected to form a cube. The effective resistance between the two corners of any edge is: (7/12)R (3/4)R (5/6)R (1/2)R Twelve identical resistors each of resistance R are connected to form a skeleton cube. The equivalent resistance between the diagonally opposite corners of the same face (face diagonal) is: 3R/4 5R/6 7R/12 R The equivalent resistance between points A and B in the following infinite network is: (1 + 3 ) (1 + 5 ) 2 1.5 A galvanometer has a sensitivity of 60 divisions/ampere . When a shunt is connected, its sensitivity becomes 10 divisions/ampere . If the resistance of the galvanometer is 20 , the value of the shunt resistance is: 4 5 20 10 A student has two resistance coils. By using them singly, in series, or in parallel, she is able to obtain resistance values of 3, 4, 12, and 16 . The resistances of the two coils are: 4 and 12 3 and 13 4 and 16 7 and 9 The current in the 8 resistor in the following circuit is: 0.5 A 1 A 2 A 0 A The current I in the given circuit is: 2 A 1 A 0.5 A 4 A Kirchhoff's first law, i.e., I = 0 at a junction, is based on the law of conservation of: Charge Energy Momentum Angular momentum Three resistors each of 4 are connected to form a triangle. The resistance between any two terminals is: 8/3 4 12 2/3 Kirchhoff's second law is based on the law of conservation of: Energy Charge Mass Momentum In the circuit shown, the value of current I is: 0.5 A 1.0 A 2.0 A 0.25 A The current I in the given network is: 5 A 2 A 7 A 0.5 A