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Karnataka PUC II Science Physics — practice by topic

Browse 131 questions across 7 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Current Electricity (56)Magnetism and Matter (28)Electric Charges and Fields (26)Electrostatic Potential Capacitance (14)Electromagnetic Induction (11)Electromagnetism (11)Moving Charges and Magnetism (11)

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In SI units, the magnitude of the elementary charge e is approximatelyRead the answer and worked solution →Which of the following is an insulator under normal conditions?Read the answer and worked solution →A body acquires a negative charge byRead the answer and worked solution →Three point charges +1, −3, and +5 (in arbitrary units) are placed in a closed system. What is the total charge of the system?Read the answer and worked solution →

Worked practice questions

In SI units, the magnitude of the elementary charge e is approximately

  1. 1.6 × 10⁻¹⁹ C
  2. 1.6 × 10⁻¹⁰ C
  3. 9.0 × 10⁹ C
  4. 8.85 × 10⁻¹² C
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Correct answer: A. 1.6 × 10⁻¹⁹ C

e ≈ 1.602 × 10⁻¹⁹ C. 9×10⁹ is Coulomb's constant k, and 8.85×10⁻¹² is the permittivity of free space ε₀.

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Which of the following is an insulator under normal conditions?

  1. Glass
  2. Iron
  3. Copper
  4. Aluminium
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Correct answer: A. Glass

Conductors (metals like copper, aluminium, iron) allow charge to move freely. Glass, like most non-metals, offers high resistance and is an insulator.

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A body acquires a negative charge by

  1. Gaining protons
  2. Losing protons
  3. Losing electrons
  4. Gaining electrons
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Correct answer: D. Gaining electrons

Protons are bound in the nucleus and are not transferred in everyday charging. A body becomes negative by gaining electrons and positive by losing them.

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