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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Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

(a) metallic bonding

(b) van der Waals'bonding

(c) ionic bonding 

(d) covalent bonding

Concept Questions :-

Current and current density
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A potentiometer circuit is set up as shown.The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1and 3, is plugged in, are found to be at lengths l1cm and l2cm respectively.The magnitudes, of the resistors R and X, in ohm, are then, equal, respectively, to

(a)kl2-l1 and kl2

(b)kl1 and kl2-l1

(c)kl2-l1and kl1

(d)kl1 and kl2

Concept Questions :-

Meter bridge and potentiometer
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