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

Subtopic:  Wheatstone Bridge |
 84%
PMT - 1994
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AB is a wire of uniform resistance. The galvanometer G shows no current when the length AC = 20cm and CB = 80 cm. The resistance R is equal to 

(1) 2 Ω

(2) 8 Ω

(3) 20 Ω

(4) 40 Ω

Subtopic:  Meter Bridge & Potentiometer |
 91%
From NCERT
PMT - 1995
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The circuit shown here is used to compare the e.m.f. of two cells E1 and E2(E1>E2). 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

Subtopic:  Meter Bridge & Potentiometer |
 73%
From NCERT
PMT - 1995
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In the Wheatstone's bridge (shown in the figure below) X = Y and A > B. The direction of the current between a and b 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.

Subtopic:  Wheatstone Bridge |
 62%
From NCERT
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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

Subtopic:  Meter Bridge & Potentiometer |
 68%
From NCERT
PMT - 1997
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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

Subtopic:  Derivation of Ohm's Law |
 71%
From NCERT
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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

Subtopic:  Meter Bridge & Potentiometer |
 83%
From NCERT
PMT - 1999
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In the circuit shown PR, the reading of the galvanometer is same with switch S open or closed. Then 

(1) IR=IG

(2) IP=IG

(3) IQ=IG

(4) IQ=IR

Subtopic:  Wheatstone Bridge |
 64%
From NCERT
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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

Subtopic:  Wheatstone Bridge |
From NCERT
PMT - 1999
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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

Subtopic:  Meter Bridge & Potentiometer |
 78%
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