# Series and Parallel Combination of Resistors

## Trending Questions

**Q.**In a meter bridge, the balancing length from left is found to be 20 cm when standard resistance of 1 Ω is in right gap. The value of unknown resistance is

- 0.25 Ω
- 0.4 Ω
- 0.5 Ω
- 4 Ω

**Q.**A ring is made of a wire having a resistance R0=12 Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub-circuit between these points is equal to 83 Ω.

- l1l2=85
- l1l2=13
- l1l2=12
- l1l2=58

**Q.**A wire has resistance 12Ω. It is bent in the form of a circle. The effective resistance between the two points on any diameter is equal to

- 6Ω
- 24Ω
- 12Ω
- 3Ω

**Q.**In the circuit shown, if a conducting wire is connected between points A and B, the current in this wire will

- Flow from A to B
- Flow in the direction which will be decided by the value of V
- Be zero
- Flow form B to A

**Q.**A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be :

- 4.0 A
- 8.0 A
- 20√13 A
- 2.0 A

**Q.**The potential difference between points A and B of adjoining figure is -

- 2 V
- 2/3 V
- 8/9 V
- 4/3 V

**Q.**Potentiometer wire PQ of 1 m length is connected to a standard cell E1. Another cell E2 of emf 1.02 V is connected with a resistance r and a switch S as shown in circuit diagram. With switch S open, null position is obtained at a distance of 51 cm from P. Calculate the e.m.f. of cell E1.

- 2.2 V
- 2 V
- 1.8 V
- 1.02 V

**Q.**A galvanometer of 50 ohm resistance has 25 divisions. A current of 4×10−4 A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of

[1 Mark]

- 245 Ω in parallel
- 2550 Ω in series
- 2450 Ω in series
- 2500 Ω in parallel

**Q.**In the circuit shown below, the current in the 1 Ω resistor is

- 1.3 A, from P to Q
- 0 A
- 0.13 A, from Q to P
- 0.13 A, from P to Q

**Q.**What is the equivalent resistance of the network shown in figure? The numbers indicate resistance in ohms

- 4 ohm
- 8 ohm

**Q.**When a 12 Ω resistor is connected with a moving coil galvanometer, then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is

- 24 Ω
- 36 Ω
- 48 Ω
- 60 Ω

**Q.**A ring is made of a wire having a resistance R0=12 Ω. Find the points A and B as shown in the figure, at which a current carrying conductor should be connected so that the resistance R of the sub-circuit between these points is equal to 83 Ω.

- l1l2=85
- l1l2=13
- l1l2=58
- l1l2=12

**Q.**Statement-1: Conductivity of a metallic conductor decreases with increase in temperature.

Statement-2: On increasing temperature the number of free electrons in the metallic conductor decreases.

- Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1
- Statement-1 is true, Statement-2 is true; Statement-2 is NOT a correct explanation for Statement-1
- Statement-1 is true, Statement-2 is false
- Statement-1 is false, Statement-2 is true

**Q.**What will be the equivalent resistance of circuit shown in figure between points A and D

- 10Ω
- 20Ω
- 30Ω
- 40Ω

**Q.**A Zener of power rating 1 W is to be used as a voltage regulator. If zener has a breakdown of 5 V and it has to regulate voltage which fluctuated between 3 V and 7 V, what should be the value of Rs for safe operation (Fig.)?

**Q.**

In the diagram, resistance between any two junctions is R. Equivalent resistance across terminals A and B is

- 18R11
- 11R7
- 11R18
- 7R11

**Q.**Seven resistances are connected as shown in figure. The equivalent resistance between A and B is

- 5Ω
- 3Ω
- 4Ω
- 4.5Ω

**Q.**The equivalent resistance between points A and B is

- 32.5 Ω
- 22.5 Ω
- 2.5 Ω
- 42.5 Ω

**Q.**Two metal cubes with 3 cm edges of copper and aluminium are arranged as shown in the figure. The total thermal current from one reservoir to the other will be

(Thermal conductivity, KCu=385 W/m-K, KAl=209 W/m-K)

- 1426 W
- 1526 W
- 1626 W
- 1726 W

**Q.**If L, R, C denote inductance, resistance, and capacitance, respectively. Then dimension ofLR2C are

- [M0L0T]
- [M0L0T0]
- [A−1M0L0T−1]
- [MLT−1]

**Q.**

In a Wheatstone bridge (see fig.), resistances P and Q are approximately equal. When $R=400\mathrm{\xce\copyright}$, the bridge is equal. When $R=400\mathrm{\xce\copyright}$, the bridge is balanced. On inter-changing P and Q, the value of R, for balance, is $405\mathrm{\xce\copyright}$. The value of X is close to

$403.5ohm$

$404.5ohm$

$401.5ohm$

$402.5ohm$

**Q.**three amplifier each having voltage gain 100 are connected in series and parallel seprately find resulâ€ an t gain in series and parallel respectively ?

**Q.**If X, Y and Z in figure are identical lamps, which of the following changes to the brightness of the lamps occur when switch S is closed?

- X stays the same, Y decreases
- X increases, Y stays the same
- X increases, Y decreases
- X decreases, Y increases

**Q.**A galvanometer of resistance 20 Ω is to be converted into an ammeter of range 1A. If a current of 1 mA produces full-scale deflection, the shunt required for the purpose is

- 0.02 Ω
- 0.01 Ω
- 0.05 Ω
- 0.04 Ω

**Q.**A meterbridge setup (as shown) is used to determine end correction at A and B. When a resistance of 15 Ω is used in left gap and of 20 Ω in right gap then null point is 42 cm from A, now if these resistances are intercharged null point is 57 cm from A then end correction at A & B are

- 3 cm, 2 cm
- 6 cm, 1 cm
- 1.5 cm, 1.5 cm
- 1 cm, 2 cm

**Q.**The resistance per unit length of a wire is 10−6 Ω/m. It is bent in the form of a circle of diameter 2 m. A wire of same material and cross sectional area is connected across its diameter. The total resistance across its diameter AB will be

- 43π×10−6Ω
- 23π×10−6Ω
- 0.88×10−6Ω
- 14×10−6Ω

**Q.**Find the current flowing through the resistance R1 of the circuit shown in figure, if the resistances are equal to R1=10 Ω, R2=10 Ω and R3=10 Ω, and the potential of points 1, 2 and 3 are equal to V1=10 V, V2=6 V and V3=5 V.

- 0.1 A
- 0.2 A
- 0.3 A
- 0.4 A

**Q.**A battery of internal resistance 4 ohm is connected to the network of resistance as shown. In order that the maximum power can be delivered to the network, the value of R in ohm should be

- 18
- 2
- 83
- 49

**Q.**

A voltmeter of resistance 400 Ω is used to measure the potential difference across the 100 Ω resistor in the circuit shown in figure (32-E24). (a) What will be the reading of the voltmeter? (b) What was the potential difference across 100 Omega before the voltmeter was connected ?

**Q.**

Is the superposition theorem applicable to AC circuits?