The circuit shown here is used to compare the e.m.f. of two cells ${E}_{1}$ and ${E}_{2}\left({E}_{1}>{E}_{2}\right)$. The null point is at C when the galvanometer is connected to E1. When the galvanometer is connected to E2, the null point will be

(1) To the left of C

(2) To the right of C

(3) At C itself

(4) Nowhere on AB

Concept Questions :-

Meter bridge and potentiometer
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the Wheatstone's bridge (shown in figure) X = Y and A > B. The direction of the current between ab will be

(1) From a to b

(2) From b to a

(3) From b to a through c

(4) From a to b through c

Concept Questions :-

Wheatstone bridge
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A resistance of 4 Ω and a wire of length 5 metres and resistance 5 Ω are joined in series and connected to a cell of e.m.f. 10 V and internal resistance 1 Ω. A parallel combination of two identical cells is balanced across 300 cm of the wire. The e.m.f. E of each cell is

(1) 1.5 V

(2) 3.0 V

(3) 0.67 V

(4) 1.33 V

Concept Questions :-

Meter bridge and potentiometer
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Constantan wire is used in making standard resistances because of its :

(1) Specific resistance is low

(2) Density is high

(3) Temperature coefficient of resistance is negligible

(4) Melting point is high

Concept Questions :-

Derivation of Ohm's law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be :

(1) 0.5 V/m

(2) 2 V/m

(3) 5 V/m

(4) 10 V/m

Concept Questions :-

Meter bridge and potentiometer
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the circuit shown $P\ne R$, the reading of the galvanometer is same with switch S open or closed. Then

(1) ${I}_{R}={I}_{G}$

(2) ${I}_{P}={I}_{G}$

(3) ${I}_{Q}={I}_{G}$

(4) ${I}_{Q}={I}_{R}$

Concept Questions :-

Wheatstone bridge
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the following Wheatstone bridge $P/Q=R/S$. If key K is closed, then the galvanometer will show deflection :

(1) In left side

(2) In right side

(3) No deflection

(4) In either side

Concept Questions :-

Wheatstone bridge
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6 Ω, the balance is obtained across 50 cm of the wire. The internal resistance of the cell is

(1) 0.5 Ω

(2) 0.6 Ω

(3) 1.2 Ω

(4) 1.5 Ω

Concept Questions :-

Meter bridge and potentiometer
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

We have a galvanometer of resistance 25 Ω. It is shunted by a 2.5 Ω wire. The part of total current that flows through the galvanometer is given as

(1) $\frac{I}{{I}_{0}}=\frac{1}{11}$

(2) $\frac{I}{{I}_{0}}=\frac{1}{10}$

(3) $\frac{I}{{I}_{0}}=\frac{3}{11}$

(4) $\frac{I}{{I}_{0}}=\frac{4}{11}$

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the adjoining circuit, the e.m.f. of the cell is 2 volt and the internal resistance is negligible. The resistance of the voltmeter is 80 ohm. The reading of the voltmeter will be

(1) 0.80 volt

(2) 1.60 volt

(3) 1.33 volt

(4) 2.00 volt