12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is

(1) 4

(2) 1

(3) 3

(4) 2

Concept Questions :-

Grouping of cells
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Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor B will fit snugly within conductor A, and conductor C will fit snugly within conductor B. Relationship between their end to end resistance is

(1) RA = RB = RC

(2) RA > RB > RC

(3) RA < RB < R

(4) Information is not sufficient

Concept Questions :-

Derivation of Ohm's law
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In the following star circuit diagram (figure), the equivalent resistance between the points A and H will be

(1) 1.944 r

(2) 0.973 r

(3) 0.486 r

(4) 0.243 r

Concept Questions :-

Combination of resistors
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In the adjoining circuit diagram each resistance is of 10 Ω. The current in the arm AD will be

1. 2i5

2. 3i5

3. 4i5

4. i5

Concept Questions :-

Combination of resistors
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In the circuit of adjoining figure the current through 12 Ω resister will be

(1) 1 A

(2) 15A

(3) 25A

(4) 0 A

Concept Questions :-

Combination of resistors
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The reading of the ideal voltmeter in the adjoining diagram will be :

1. 4 V

2. 8 V

3. 12 V

4. 14 V

Concept Questions :-

Combination of resistors
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The resistance of the series combination of two resistance is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is :

(1) 4

(2) 3

(3) 2

(4) 1

Concept Questions :-

Combination of resistors
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Which of the adjoining graphs represents ohmic resistance :

(1)

(2)

(3)

(4)

Concept Questions :-

Derivation of Ohm's law
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Variation of current passing through a conductor as the voltage applied across its ends as varied is shown in the adjoining diagram. If the resistance (R) is determined at points A, B, C and D, we will find that :

(1) RC = RD

(2) RB > RA

(3) RC > RB

(4) None of these

Concept Questions :-

Derivation of Ohm's law
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The voltage V and current I graph for a conductor at two different temperatures T1 and T2 are shown in the figure. The relation between T1 and T2 is :

(1) T1 > T2

(2) T1T2

(3) T1 = T2

(4) T1 < T2

Concept Questions :-

Derivation of Ohm's law
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Difficulty Level: