NEET Physics Current Electricity Questions Solved


A battery of internal resistance r, when connected across 2Ω resistor supplies a current of 4A, when the same battery is connected across a 5Ω resistor, it supplies a current od 2A. The value of r is  

1.  2Ω  

2.  1Ω  

3.  0.5Ω  

4.  Zero

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In the circuit shown in figure find the value of r(internal resistance of the cell) for which power transferred by the cell is maximum

                                   

1.  4Ω  

2.  12Ω  

3.  16Ω 

4.   8Ω

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If the voltage across a bulb decreases by 1%, then the percentage change in its power output is

1.  1%

2.  4%

3.  2%

4.  5%

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A wire having resistance 16Ω is stretched to double of its original length. The new resistance of the wire will be 

1.  4Ω  

2.  8Ω  

3.  32Ω

4.  64Ω

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A battery of emf of 4V gives a current of 0.2A when connected across a wire of resistance 18Ω. the internal resistance of the battery is 

1.  1Ω  

2.  2Ω  

3.  4Ω  

4.  20Ω

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In the circuit shown in the figure, the current supplied by the battery is

                             

1.  2A

2.  1A

3.  0.5A

4.  0.4A

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Two battries ofemf E1, E2 and internal resistance r1, r2 are connected in parallel. The effective emf of the circuit across A and B is

1.  E1r1 + E2r2r1 + r2  

2.  E1r2 + E2r1r1 + r2  

3.  E1r2 + E2r1r1 + r2  

4.  E1r1 + E2r2r1 + r2

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Which of the following graphs correctly represents the variation of mobility μ of electrons with applied electric field E in a metallic conductor

1.  

2.  

3.  

4.  

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the equivalent resistance across AB is

   

1.  2R

2.  R/2

3.  4R/3

4.  3R/2

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