The internal resistance of a 2.1V cell which gives a current of 0.2A through a resistance of 10Ω is :

(a)0.2Ω

(b)0.5Ω

(c)0.8Ω

(d)1.0Ω

Concept Questions :-

Emf and terminal voltage
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A millivoltmeter of 25 mV range is to be converted into an ammeter of 25 A range. The value (in ohm) of necessary shunt will be

(a)0.001                                     (b)0.01

(c)1                                            (d)0.05

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In the circuit shown the cells A and B have negligible resistances. For VA=12V, R1=500Ω and R=100Ω the galvanometer (g) shown no deflection.The value of VB is 

(a)4V                                         (b)2V

(c)12V                                       (d)6V

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If voltage across a bulb rated 220 V-100 W drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is

(a)20%                                             (b)2.5%

(c)5%                                               (d)10%

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A ring is made of a wire having a resistane 

R0=12Ω. Find the points A and B, as shown

in the figure, at which a current carrying 

conductor should be connected so that the 

resistance R of the sub circuit between these

points is equal to 8/3Ω

1. l1l2=58                    2. l1l2=13

3. l1l2=38                    4. l1l2=12

 

Concept Questions :-

Combination of resistors
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The power dissipated in the circuit shown in

the figure is 30 Watt. The value of R is :

(a) 20Ω

(b) 15Ω

(c) 10Ω

(d) 30Ω

Concept Questions :-

Heating effect of current
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A cell having an emf ε internal resistance r

is connected across a variable external 

resistance R. As the resistance R is increased,

the plot of potential difference V across R is given 

by

(a)          

(b) 

(c) 

(d) 

 

Concept Questions :-

Emf and terminal voltage
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If power dissipated in the 9Ω resistor in the circuit 

shown is 36 W, the potential difference across 

the 2Ω resistor is

(a) 8 V

(b) 10 V

(c) 2 V

(d) 4 V

 

Concept Questions :-

Heating effect of current
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A current of 2A flows through a 2Ω resistor

when connected across a battery. The same

battery supplies a current of 0.5 A when

connected across a 9Ω resistor. The internal

resistance of the battery is 

(a) 1/3Ω                   (b) 1/4Ω

(c) 1Ω                       (d) 0.5Ω

Concept Questions :-

Emf and terminal voltage
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In the circuit in the figure, if the potential at point A is taken to be zero, the potential at point B is :

1. -1V                                          2. +2V

3. -2V                                          4. +1V

Concept Questions :-

Kirchoff's voltage law
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