10 MOST IMPORTANT QUESTION FOR PHYSICS BOARD CLASS 12

 

  1. What is the electric field intensity at a point P located at a distance of 20 cm from a point charge of 10 μC?

  2. State the principle of a transformer. Explain with the help of a labeled diagram how a step-up transformer works.

  3. Explain the construction and working of a cyclotron.

  4. State Gauss's law for electric fields. How is it different from Coulomb's law?

  5. What is an electromagnetic wave? Explain the properties of an electromagnetic wave.

  6. What are the factors affecting the resistance of a conductor? Explain.

  7. What is the meaning of the term 'semiconductor'? Explain with examples.

  8. What is a wavefront? Explain the Huygens principle.

  9. Derive an expression for the electric potential energy of a system of two point charges.

  10. What is the Doppler effect? Explain its two types with the help of an example for each.

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