Wheatstone's Bridge MCQ - Practice Questions & Answers

Gujarat NEET 2024 Cutoff - MBBS/BDS for Government, Ayurveda & Private Colleges

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Wheatstone's bridge is considered one of the most asked concept.
12 Questions around this concept.

Solve by difficulty

In a Wheatstone’s bridge, three resistance P,Q and R connected in the three arms and the fourth arm is formed by two resistance S₁ and S₂ connected in parallel. The condition for bridge to be balanced will be

A

$\frac{P}{Q}= \frac{R}{S_{1}+S_{2}}$

B

$\frac{P}{Q}= \frac{2R}{S_{1}+S_{2}}$

C

$\frac{P}{Q}= \frac{R\left ( S_{1}+S_{2} \right )}{S_{1}S_{2}}$

D

$\frac{P}{Q}= \frac{R\left ( S_{1}+S_{2} \right )}{2S_{1}S_{2}}$

The current I drawn from the 5 volt source will be :

A

$0.17 A$

B

$0.33 A$

C

$0.5 A$

D

$0.67 A$

Concepts Covered - 1

Wheatstone's bridge

Wheatstone's Bridge

It is an arrangement of four resistances which can be used to measure one of them in terms of rest. Let R is an adjustable resistance, Pand Q are known resistance and S is an unknown resistance. To obtain valur of S we will close the keys K1 and K2 and will adjust R to obtain null deflection in the galvanometer. Then the balancing condition of bridge is

$\frac{P}{Q}= \frac{R}{S}$

$V_{B} = V_{D}$

( Balanced condition )

No current will flow through the galvanometer

unbalanced condition: $V_{B}>V_{D}$

$(V_{A}-V_{B})<(V_{A}-V_{D})$

Current will flow from $A$ to $B$

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Wheatstone's bridge

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