10th Class Physics: Electricity and Magnetism
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Questions and Answers

What is the SI unit of electric power?

  • Volt
  • Ohm
  • Watt (correct)
  • Ampere

    • In a series combination of resistors, how does the total resistance compare to the individual resistances?

  • It is unrelated to the individual resistances
  • It is equal to the sum of the individual resistances (correct)
  • It is always greater than the largest individual resistance
  • It is always less than the smallest individual resistance

    • What is the relationship between current passing through a conductor and its resistance, according to Ohm's law?

  • No relationship
  • Exponential relationship
  • Inversely proportional
  • Directly proportional (correct)

    • What is the role of a prism in the dispersion of light?

    <p>Refraction of light</p> Signup and view all the answers

    How does alternating current (AC) differ from direct current (DC)?

    <p>AC changes direction periodically, while DC flows in one direction only</p> Signup and view all the answers

    What do magnetic field lines represent around a current-carrying conductor?

    <p>Magnetic flux density</p> Signup and view all the answers

    How does a convex lens form an image compared to a concave lens?

    <p>Convex lens forms real and inverted images, while concave lens forms virtual and upright images</p> Signup and view all the answers

    Why is AC preferred over DC for long-distance power transmission?

    <p>AC can easily be converted to higher voltages for transmission</p> Signup and view all the answers

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