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ISC Class 12 Current Electricity — practice questions — page 3

Explore 67 free Current Electricity questions in ISC Class 12 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

Showing questions 61–67 of 67.

The quantity denoted by sigma, the inverse of resistivity, is:Read the answer and worked solution →Resistance depends on the material and on the conductor's:Read the answer and worked solution →Halving the cross-section area of a conductor makes resistance:Read the answer and worked solution →Tap what affects resistanceRead the answer and worked solution →NEET · Physics · Kirchhoff's LawsRead the answer and worked solution →The resistance inside a cell itself is called its:Read the answer and worked solution →Current electricity numbersRead the answer and worked solution →

Worked practice questions

The quantity denoted by sigma, the inverse of resistivity, is:

  1. Conductivity
  2. Capacitance
  3. Conductance
  4. Capacity of
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Correct answer: A. Conductivity

1. Resistivity measures how strongly a material resists flow. 2. Its reciprocal measures how well it conducts. 3. That quantity is the conductivity. 4. So the answer is conductivity. _Source: syllabus Physics, Ch 3 'Current Electricity'_

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Resistance depends on the material and on the conductor's:

  1. Price value
  2. Dimensions
  3. Colour only
  4. Age in years
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Correct answer: B. Dimensions

1. Two wires of the same metal can differ in resistance. 2. Length and area both enter the formula. 3. So R depends on the material and the dimensions. 4. The answer is dimensions. _Source: syllabus Physics, Ch 3 'Current Electricity'_

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Halving the cross-section area of a conductor makes resistance:

  1. Zeroing
  2. Double
  3. Halved
  4. Same as
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Correct answer: B. Double

1. A narrower path is harder for charge to cross. 2. Resistance varies inversely with area. 3. So halving the area doubles the resistance. 4. The answer is double. _Source: syllabus Physics, Ch 3 'Current Electricity'_

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More Physics topics

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