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 |
 61%
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. none of the above

Subtopic:  Wheatstone Bridge |
 55%
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%
From NCERT
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In the circuit given below, the emf 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

Subtopic:  Kirchoff's Voltage Law |
 51%
From NCERT
PMT - 1991
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A voltmeter has resistance of 2000 ohms and it can measure upto 2V. If we want to increase its range to 10 V, then the required resistance in series will be 

(1) 2000 Ω

(2) 4000 Ω

(3) 6000 Ω

(4) 8000 Ω

Subtopic:  Meter Bridge & Potentiometer |
 77%
From NCERT
PMT - 1997
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