MCQs On Wheatstone Bridge

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Wheatstone Bridge MCQs are important questions from the Current Electricity concept from the latest CBSE Class 12 Physics Syllabus. Wheatstone Bridge MCQs cover concepts related to the components of the bridge circuit, its measurement, and its effects on other electrical components.

Wheatstone Bridge works on the principle of zero deflection. It is used to measure the unknown resistance in an electrical circuit. The Wheatstone bridge was discovered by Samuel Hunter Christie in 1833. Wheatstone Bridge is a resistance bridge that comprises 2 unknown resistors. One of these legs is an unknown resistor and the other is a variable resistor. These two when connected as a bridge give a reliable and accurate measurement.

Wheatstone Bridge

Wheatstone Bridge Setup

The basic principle involves measuring the ratio of the resistances which are equal such that there is no current flow through the electrical circuit. The bridge is unbalanced under normal conditions and hence current flows through the galvanometer. This flow is achieved by balancing the known and the variable resistances.

Class 12 Wheatstone Bridge MCQs

Ques. Electric Strain Gauges are measured by a Wheatstone bridge because

High Sensitivity
Low Sensitivity
Sensitivity is Zero
Sensitivity has a finite value

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Ans. The correct option is B. High Sensitivity.

Explanation: The characteristic features of the Wheatstone bridge are:

Consists of two resistances in a series and parallel arrangement.
Resistances are connected between a voltage supply and ground, thereby producing net zero voltage in the two legs at balanced conditions
Wheatstone bridge measures medium resistance and should not be used for low resistance measurements as an error is produced.
The high sensitivity of the Wheatstone bridges makes it applicable in electric strain gauges.
There are two input and output terminals each with four resistors connected in a diamond-shaped arrangement.
At balanced condition, \(\frac{R_1}{R_3}=\frac{R_2}{R_4}\)

quarter-bridge-strain-gauge-circuit

Ques. Wheatstone bridge is a __________

A.C. bridge
High voltage bridge
Power Dissipation bridge
D.C. bridge

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Ans. The correct option is D. D.C.Bridge.

Explanation: Medium resistance is measured by Wheatstone bridge which is a D.C. Bridge. High voltages are measured using Schering Bridge. Ac bridges comprise Anderson and Maxwell Bridges.

Ques. Why is D.C resistance for different wires measured using a Wheatstone bridge?

To maintain a source of constant e.m.f
To calculate the effective resistance
Check the quality of wire
To calculate the power dissipated

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Ans. The correct option is C. Check the quality of the wire.

Explanation: In the Wheatstone bridge circuit the source of voltage remains the same and this maintains a constant e.m.f in the circuit. This is why D.C. resistance is measured in different wire materials to check their quality.

Ques. The resistance range measured by the Wheatstone bridge is?

10kΩ to a few megaohms
100Ω to a few teraohms
1Ω to a few megaohms
100MΩ to a few gigaohms

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Ans. The correct option is C. 1Ω to a few megaohms.

Explanation: Wheatstone bridge is typically employed to measure medium resistance and not lower resistance ranges. Thus the measurement range varies from 1Ω to a few megaohms.

Do Check Out:

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Ques. What is the cost of maintenance of a Wheatstone Bridge?

Expensive
Low
Source e.m.f dependant
Component dependant

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Ans. The correct option is A. Expensive.

Explanation: The maintenance cost of a Wheatstone bridge is extremely high owing to its resistance tolerance limit of up to 1%. The source of voltage or the components do not add up to the expenses as there are typically uniform for all bridge circuits.

Ques. The effect of galvanometer in measuring high resistance is_____________

Dependant on the source e.m.f.
It becomes insensitive to imbalances in the circuit
Zero
Dependant on the galvanometer type

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Ans. The correct option is B. It becomes insensitive to imbalances in the circuit.

Explanation: When high resistance is measured using a Wheatstone bridge, the galvanometer can't sense such high resistance values and fails to detect an imbalance in the circuit.

Ques. What does the following figure indicate about the circuit?

It is a high resistance construction
It is a medium resistance construction
It is a low resistance construction
It is an extremely low resistance construction

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Ans. The correct option is C. It is a low-resistance construction.

Explanation:

The ammeter A measures the current passing through the electric circuit. The voltmeter V measures the voltage. Thus, the above construction is meant for low resistances.

Ques. _________ is not a source of error in the low resistance measurement.

The thermal e.m.f
The effect of temperature
The power dissipated through the electrical circuit
The drop in contact resistance at the leads

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Ans. The correct option is A. The thermal e.m.f

Explanation: The current flowing through a low resistance circuit is always low. This causes a drop in voltage across the terminals thereby nullifying the contact and lead resistances. The high current flow induces a temperature increase causing a thermal e.m.f. to occur.

Ques. What are the terminals aa’ used for?

To measure the power dissipation of circuit
To measure the current flow through circuit
To measure the voltage drop across the resistance
To measure the resistance of circuit

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Ans. The correct option is C. To measure the voltage drop across the resistance

Explanation: The voltmeter V is connected across the terminals aa’. This measures the voltage drop across the resistance R.

Ques. What is the value of the current I?

I = I_v I_r
I = I_v ⁄ I_r
I = I_v + I_r
I = I_v – I_r

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Ans. The correct option is C. I = I_v + I_r

Explanation: At node N, Kirchhoff’s current law is applied

I = I_v + I_r

where,

I is the total series current flowing through the circuit

I_v is the current flowing through the voltmeter

I_r is the current flowing through the resistance R

Ques. If the source and the detector are interchanged in a Wheat stone bridge, then the balance condition becomes?

Reduced to half
Independent of the source or detector type
Remains the same
More by a factor of 2

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Ans.The correct option is B. Independent of the source or detector type

Explanation: In a Wheatstone bridge, balancing occurs with the help of the output signal from the detector being balanced automatically or manually. This happens in the form of a feedback loop which then finds the null position. The unknown resistance under the balancing condition R_x is

R_x = (R₃R₁)/R₂

This state is not dependent on the source resistance of the voltage source or the sensitivity or the input resistance of the detector.

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Wheatstone Bridge MCQs

Class 12 Wheatstone Bridge MCQs

CBSE CLASS XII Related Questions

1.
A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

2.
Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.
The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.
The resistance of a wire at 25°C is 10.0 \( \Omega \). When heated to 125°C, its resistance becomes 10.5 \( \Omega \). Find (i) the temperature coefficient of resistance of the wire, and (ii) the resistance of the wire at 425°C.

Similar Physics Concepts

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Wheatstone Bridge MCQs

Class 12 Wheatstone Bridge MCQs

CBSE CLASS XII Related Questions

1.A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

2.Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.The resistance of a wire at 25°C is 10.0 \( \Omega \). When heated to 125°C, its resistance becomes 10.5 \( \Omega \). Find (i) the temperature coefficient of resistance of the wire, and (ii) the resistance of the wire at 425°C.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

2.
Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.
The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.
The resistance of a wire at 25°C is 10.0 \( \Omega \). When heated to 125°C, its resistance becomes 10.5 \( \Omega \). Find (i) the temperature coefficient of resistance of the wire, and (ii) the resistance of the wire at 425°C.