Wheatstone Bridge
Q. What is the effect of temperature on the resistance in a Wheatstone bridge?
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A.
Resistance increases with temperature
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B.
Resistance decreases with temperature
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C.
Resistance remains constant
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D.
Depends on the material
Solution
The effect of temperature on resistance depends on the material; for most conductors, resistance increases with temperature.
Correct Answer: D — Depends on the material
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Q. What is the formula for the equivalent resistance in a balanced Wheatstone bridge?
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A.
R_eq = (P + Q)
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B.
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C.
(R + S)
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D.
R_eq = P + Q + R + S
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.
R_eq = P
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.
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.
Q + R
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.
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.
S
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.
R_eq = (P*R)/(Q + S)
Solution
The equivalent resistance in a balanced Wheatstone bridge can be calculated using the parallel formula.
Correct Answer: A — R_eq = (P + Q)
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Q. What is the formula for the equivalent resistance of two resistors R1 and R2 in series in a Wheatstone bridge?
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A.
R1 + R2
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B.
R1 * R2 / (R1 + R2)
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C.
R1 - R2
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D.
1/(1/R1 + 1/R2)
Solution
The equivalent resistance of two resistors in series is simply the sum of their resistances: R1 + R2.
Correct Answer: A — R1 + R2
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Q. What is the formula for the equivalent resistance of two resistors R1 and R2 in series?
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A.
R_eq = R1 + R2
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B.
R_eq = R1 * R2 / (R1 + R2)
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C.
R_eq = R1 - R2
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D.
R_eq = R1 / R2
Solution
The equivalent resistance of two resistors in series is simply the sum of their resistances: R_eq = R1 + R2.
Correct Answer: A — R_eq = R1 + R2
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Q. What is the main advantage of using a Wheatstone bridge in measurements?
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A.
It is very fast
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B.
It provides high accuracy
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C.
It is very simple
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D.
It requires no power supply
Solution
The Wheatstone bridge is known for providing high accuracy in measuring unknown resistances.
Correct Answer: B — It provides high accuracy
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Q. What is the main advantage of using a Wheatstone bridge?
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A.
It is simple to construct
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B.
It provides high accuracy in measurement
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C.
It can measure both AC and DC
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D.
It is portable
Solution
The Wheatstone bridge is known for its high accuracy in measuring unknown resistances.
Correct Answer: B — It provides high accuracy in measurement
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Q. What is the main application of a Wheatstone bridge?
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A.
Measuring capacitance
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B.
Measuring inductance
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C.
Measuring resistance
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D.
Measuring voltage
Solution
The primary application of a Wheatstone bridge is to measure unknown resistances.
Correct Answer: C — Measuring resistance
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Q. What is the maximum number of resistors that can be used in a Wheatstone bridge configuration?
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A.
2
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B.
3
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C.
4
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D.
Unlimited
Solution
A standard Wheatstone bridge configuration uses four resistors.
Correct Answer: C — 4
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Q. What is the potential difference across the galvanometer in a balanced Wheatstone bridge?
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A.
Zero
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B.
Equal to the supply voltage
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C.
Depends on the resistances
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D.
Half of the supply voltage
Solution
In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flows through it.
Correct Answer: A — Zero
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Q. What is the primary use of a Wheatstone bridge in practical applications?
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A.
To measure voltage
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B.
To measure current
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C.
To measure resistance
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D.
To measure power
Solution
The primary use of a Wheatstone bridge is to measure unknown resistances by balancing it against known resistances.
Correct Answer: C — To measure resistance
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Q. What is the purpose of a galvanometer in a Wheatstone bridge?
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A.
To measure voltage
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B.
To measure current
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C.
To detect the balance condition
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D.
To provide power
Solution
A galvanometer is used to detect the balance condition in a Wheatstone bridge by indicating zero current when balanced.
Correct Answer: C — To detect the balance condition
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Q. What is the purpose of the galvanometer in a Wheatstone bridge?
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A.
To measure voltage
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B.
To measure current
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C.
To detect the balance condition
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D.
To provide power
Solution
The galvanometer is used to detect the balance condition by indicating the current flow.
Correct Answer: C — To detect the balance condition
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Q. What is the role of the galvanometer in a Wheatstone bridge?
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A.
To measure voltage
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B.
To measure current
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C.
To detect balance
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D.
To provide power
Solution
The galvanometer is used to detect whether the bridge is balanced or unbalanced.
Correct Answer: C — To detect balance
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Q. Which of the following configurations can be used to create a Wheatstone bridge?
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A.
Series only
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B.
Parallel only
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C.
Series and parallel
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D.
None of the above
Solution
A Wheatstone bridge can be formed using a combination of series and parallel resistors.
Correct Answer: C — Series and parallel
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Q. Which of the following is NOT a component of a Wheatstone bridge?
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A.
Galvanometer
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B.
Battery
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C.
Inductor
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D.
Resistors
Solution
An inductor is not a component of a Wheatstone bridge; it consists of resistors, a galvanometer, and a battery.
Correct Answer: C — Inductor
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Q. Which of the following is NOT a condition for a Wheatstone bridge to be balanced?
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A.
The ratio of resistances must be equal
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B.
No current flows through the galvanometer
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C.
The resistances must be equal
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D.
The potential difference across the galvanometer is zero
Solution
While the other conditions are necessary for balance, the resistances do not need to be equal, just in the same ratio.
Correct Answer: C — The resistances must be equal
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Q. Which of the following is NOT a practical application of a Wheatstone bridge?
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A.
Measuring small resistances
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B.
Calibration of measuring instruments
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C.
Determining the specific resistance of a material
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D.
Generating high voltages
Solution
A Wheatstone bridge is not used for generating high voltages; it is used for measuring resistances.
Correct Answer: D — Generating high voltages
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Q. Which of the following is NOT a practical application of the Wheatstone bridge?
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A.
Measuring unknown resistances
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B.
Calibration of measuring instruments
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C.
Determining the specific heat of a substance
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D.
Testing electrical components
Solution
Determining the specific heat of a substance is not a practical application of the Wheatstone bridge.
Correct Answer: C — Determining the specific heat of a substance
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Q. Which of the following statements is true about a Wheatstone bridge?
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A.
It can only be used for DC circuits
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B.
It can measure both AC and DC resistances
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C.
It is only used for high resistances
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D.
It requires a power source to function
Solution
A Wheatstone bridge can be used to measure both AC and DC resistances.
Correct Answer: B — It can measure both AC and DC resistances
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Q. Which of the following statements is true regarding a balanced Wheatstone bridge?
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A.
The total resistance is minimized.
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B.
The potential difference across the galvanometer is zero.
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C.
The current through the resistors is equal.
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D.
The resistors must be of equal value.
Solution
In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flow.
Correct Answer: B — The potential difference across the galvanometer is zero.
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Q. Which of the following statements is true regarding a Wheatstone bridge?
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A.
It can only be used for DC circuits.
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B.
It can only be used for AC circuits.
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C.
It can be used for both AC and DC circuits.
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D.
It is only used for measuring voltage.
Solution
A Wheatstone bridge can be used for both AC and DC circuits to measure resistance.
Correct Answer: C — It can be used for both AC and DC circuits.
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Q. Which of the following statements is true regarding the Wheatstone bridge?
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A.
It can only measure AC resistances
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B.
It can measure unknown resistances
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C.
It requires a power source to operate
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D.
It is only used in high voltage applications
Solution
The Wheatstone bridge is primarily used to measure unknown resistances by balancing it against known resistances.
Correct Answer: B — It can measure unknown resistances
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