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JEE Main General Science — practice by topic

Browse 58 questions across 1 General Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Kirchhoff's Voltage Law for a loop is fundamentally a statement of conservation ofRead the answer and worked solution →According to Kirchhoff's Voltage Law, the algebraic sum of all potential differences around any closed loop isRead the answer and worked solution →Kirchhoff's Current Law at a junction is based on conservation of which physical quantity?Read the answer and worked solution →If the original dipole moment of a bar magnet is $M$, what will be the dipole moment of each piece after cutting it along a transverse axis?Read the answer and worked solution →

Worked practice questions

Kirchhoff's Voltage Law for a loop is fundamentally a statement of conservation of

  1. Charge
  2. Mass
  3. Energy
  4. Current
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Correct answer: C. Energy

As a charge completes one closed loop and returns to its starting point, the net change in electric potential energy per unit charge must be zero. **Hence KVL is a direct consequence of conservation of energy.**

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According to Kirchhoff's Voltage Law, the algebraic sum of all potential differences around any closed loop is

  1. Equal to the largest voltage in the loop
  2. Equal to the sum of resistive drops only
  3. Zero
  4. Always positive
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Correct answer: C. Zero

Kirchhoff's Voltage Law states that the algebraic sum of emfs and potential drops around a closed loop is zero. This expresses conservation of energy in an electric circuit.

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Kirchhoff's Current Law at a junction is based on conservation of which physical quantity?

  1. Energy
  2. Charge
  3. Momentum
  4. Potential difference
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Correct answer: B. Charge

Kirchhoff's Current Law follows from conservation of charge. Since charge cannot accumulate at an ideal junction in steady state, total current entering the node equals total current leaving it.

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