A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The "Watt-hour" efficiency of the battery is :

(1) 82.5%

(2) 80 %

(3) 90%

(4) 87.5%

Concept Questions :-

Heating effect of current
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In the given current distribution what is the value of I 

(1) 3A

(2) 8 A

(3) 2A

(4) 5A

Concept Questions :-

Kirchoff's current law
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A capacitor is connected to a cell of emf E having some internal resistance r. The potential difference across the 

(1) Cell is < E

(2) Cell is E

(3) Capacitor is > E

(4) Capacitor is < E

Concept Questions :-

Grouping of cells
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The maximum power drawn out of the cell from a source is given by (where r is internal resistance)  

(1) E2/2r

(2) E2/4r

(3) E2/r

(4) E2/3r

Concept Questions :-

Heating effect of current
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Find out the value of current through 2Ω resistance for the given circuit 

(1) 5 A

(2) 2 A

(3) Zero

(4) 4 A

Concept Questions :-

Kirchoff's voltage law
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Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are R1 and R2(R2>R1). If the potential difference across the source having internal resistance R2 is zero, then 

(1) R=R1R2/(R1+R2)

(2) R=R1R2/(R2R1)

(3) R=R2×(R1+R2)/(R2R1)

(4) R=R2R1

Concept Questions :-

Grouping of cells
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The magnitude of i in ampere unit is 

(1) 0.1

(2) 0.3

(3) 0.6

(4) None of these

Concept Questions :-

Kirchoff's voltage law
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To draw maximum current from a combination of cells, how should the cells be grouped 

(1) Series

(2) Parallel

(3) Mixed

(4) Depends upon the relative values of external and internal resistance

Concept Questions :-

Grouping of cells
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By ammeter, which of the following can be measured 

(1) Electric potential

(2) Potential difference

(3) Current

(4) Resistance

Concept Questions :-

Current and current density
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For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because 

(1) Potentiometer is more sensitive than voltmeter

(2) The resistance of potentiometer is less than voltmeter

(3) Potentiometer is cheaper than voltmeter

(4) Potentiometer does not take current from the circuit

Concept Questions :-

Meter bridge and potentiometer
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