Class 12 ISC Current Electricity Boards Questions

Here we provide Class 12 Physics important notes,board questions and predicted questions with Answers for chapter Current Electricity. These important notes,board questions and predicted questions are based on ISC board curriculum and correspond to the most recent Class 12 Physics syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations.

class 12 ISC Physics Current Electricity BoardQuestions

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Important Notes
Board Questions





Current Electricity BoardsQuestions
Q1 A metallic wire having a resistance of 20 Ω is bent in order to form a complete circle. Calculate the resistance between any two diametrically opposite points on the circle.

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Q2 A uniform copper wire having a cross sectional area of 1mm2 carries a current of 5 A. Calculate the drift speed of free electrons in it. (Free electrons number density of copper = 2 x 1028 m-3).

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Q3 An electric bulb is rated as 250 V, 750 W. Calculate:
  1. the electric current flowing through it when it is operated on a 250 V supply
  2. resistance of its filament.

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Q4 Calculate the net emf across A and B shown in figure below:


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Q5 A carbon resistor has coloured band as shown in figure below. The resistance of the register is

  1. 26Ω ± 10 %
  2. 26Ω ± 5 %
  3. 260Ω ± 5 %
  4. 260Ω ± 10 %

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Q6 For a metallic conductor, what is the relation between current density (J) , conductivity (σ) and electric field intensity E?

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Q7 A metallic wire has a resistance of 3Ω at 0o C in 4.8Ω at 150o C. Find the temperature coefficient of resistance of its material.

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Q8 A wire of resistance ‘R’ is cut into an equal parts. These parts are then connected in parallel with each other. The equivalent resistance of the combination is:
  1. nR
  2. R/n
  3. n/R2
  4. R/n2

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Q9 What is meant by drift speed of free electrons?

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Q10 Two resistors R1 = 60 Ω and R2 = 90 Ω are connected in parallel. If electric power consumed by the resistor R1 is 15 W, calculate the power consumed by the resistor R2

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Q11 Figure below shows two resistors R1 and R2 connected to a battery having an emf of 40 V and negligible internal resistance. A voltmeter having a resistance of 300 Ω is used to measure potential difference across R1 . Find the reading of the voltmeter.


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Q12 The order of coloured rings in a carbon resistor is red, yellow , blue and silver. The resistance of the carbon resistor is :
  1. 24 x 106Ω ± 5%
  2. 24 x 106Ω ± 10%
  3. 34 x 104Ω ± 10%
  4. 26 x 104Ω ± 5%

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Q13 Define current density. Write an expression which connects current density with drift speed

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Q14 Electric bulb is marked 200 V , 100 W. Calculate electric resistance of its filament. If 5 such bulbs are connected in series to 200 V supply, how much current will flow through them?

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