Important Questions of Current Electricity Physics | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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421.

The current flowing through a wire depends on time as I = 3t2 + 2t + 5. The charge flowing through the cross-section of the wire in time from t = 0 to t = 2 s is 

  • 22 C

  • 20 C

  • 18 C

  • 5 C


 Multiple Choice QuestionsShort Answer Type

422.

Two cells each of same emf e but of internal resistances r1 and r2 are connected in series through an external resistance R. If the potential difference between the ends of the first cell is zero, what will be the value of R in terms of r1 and r2 ?


 Multiple Choice QuestionsMultiple Choice Questions

423.

The reading of the ammeter in the following figure will be

   

  • 0.8 A

  • 0.6 A

  • 0.4 A

  • 0.2 A


424.

A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire

  • nR

  • n2R

  • 2nR

  • 2n2R


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 Multiple Choice QuestionsShort Answer Type

425.

A battery of emf E and internal resistance r is connected across a pure resistive device (such as an electric heater) of resistance R. Prove that the power output of the device will be maximum if R = r.


 Multiple Choice QuestionsMultiple Choice Questions

426.

The resistance across A and B in the figure below will be 

          

  • 3R

  • R

  • R3

  • None of the above


427.

Five equal resistance, each of resistance R are connected as shown in figure below. A battery of V volt is connected between A and B. The current flowing in FC will be

  • 3VR

  • VR

  • V2R

  • 2VR


428.

Two cells with the same emf E and different internal resistances r1 and r2 are connected in series to an  external resistance R. The value of R so that the potential difference across the first cell be zero, is

  • r1r2

  • r1 + r2

  • r1 − r2

  • r1 + r22


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429.

What current will flow through the 2 k Ω resistor in the circuit shown in the figure ?

 

  • 3 mA

  • 6 mA

  • 12 mA

  • 36 mA


430.

The I- V characteristics of a metal wire at two different temperatures (T1 and T2) are given in the adjoining figure. Here, we can conclude that

          

  • T1 > T2

  • T1 < T2

  • T1 = T2

  • T1 = 2T2


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