A potentiometer is used for the comparison of e.m.f. of two cells *E*_{1} and *E*_{2}. For cell *E*_{1} the no deflection point is obtained at 20*cm* and for *E*_{2} the no deflection point is obtained at 30*cm*. The ratio of their e.m.f.'s will be

(1) 2/3

(2) 1/2

(3) 1

(4) 2

Concept Questions :-

Meter bridge and potentiometer

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If the length of the potentiometer wire is increased, then the length of the previously obtained balance point will :

(1) Increase

(2) Decrease

(3) Remain unchanged

(4) Become two times

Concept Questions :-

Meter bridge and potentiometer

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will

(1) Change

(2) Remain unchanged

(3) Depend on the internal resistance of cell and resistance of galvanometer

(4) None of these

Concept Questions :-

Wheatstone bridge

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Two cells when connected in series are balanced on 8*m* on a potentiometer. If the cells are connected with polarities of one of the cells reversed, they balance on 2*m*. The ratio of e.m.f.'s of the two cells is

(1) 3 : 5

(2) 5 : 3

(3) 3 : 4

(4) 4 : 3

Concept Questions :-

Grouping of cells

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In the diagram shown, the reading of voltmeter is 20 *V* and that of ammeter is 4 *A*. The value of *R* should be (consider given ammeter and voltmeter are not ideal)** :**

(1) Equal to 5 Ω

(2) Greater from 5 Ω

(3) Less than 5 Ω

(4) Greater or less than 5 Ω depends on the material of *R *

PMT - 1997

Concept Questions :-

Kirchoff's voltage law

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which is a *wrong* statement :

(1) The Wheatstone bridge is most sensitive when all the four resistances are of the same order

(2) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge

(3) Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge

(4) The rheostat can be used as a potential divider

PMT - 1994

Concept Questions :-

Wheatstone bridge

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

*AB* is a wire of uniform resistance. The galvanometer *G* shows no current when the length AC = 20*cm* and *CB *= 80 *cm*. The resistance *R* is equal to** **

(1) 2 Ω

(2) 8 Ω

(3) 20 Ω

(4) 40 Ω

PMT - 1995

Concept Questions :-

Meter bridge and potentiometer

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

PMT - 1995

Concept Questions :-

Meter bridge and potentiometer

To view Explanation, Please buy any of the course from below.

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

To view Explanation, Please buy any of the course from below.

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*

PMT - 1997

Concept Questions :-

Meter bridge and potentiometer

To view Explanation, Please buy any of the course from below.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: