Class 12 Physics | Wheatstone Bridge MCQ | Enlight CBSE

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

a. High Sensitivity

b. Low Sensitivity

c. Sensitivity is Zero

d. Sensitivity has a finite value

Answer: B. High Sensitivity.

The characteristic features of the Wheatstone bridge are:

1. Consists of two resistances in a series and parallel arrangement.

2. Resistances are connected between a voltage supply and ground, thereby producing net zero voltage in the two legs at balanced conditions

3. Wheatstone bridge measures medium resistance and should not be used for low resistance measurements as an error is produced.

4. The high sensitivity of the Wheatstone bridges makes it applicable in electric strain gauges.

5. There are two input and output terminals each with four resistors connected in a diamond-shaped arrangement.

6. At balanced condition, R1/R2= R3/Rx

Q. Wheatstone Bridge is a:

a. A.C. bridge

b. High voltage bridge

c. Power Dissipation bridge

d. D.C. bridge

Answer: The correct option is D.C. Bridge. 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.