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Class 12 Physics questions for NEB Exam 2023 The most important Class 12 Physics questions for the NEB Exam 2023 are listed here: De...

The most important Class 12 Physics questions for the NEB Exam 2023 are listed here:

Define wave motion. Derive the progressive wave equations in a medium.

Starting with the definition of stationary waves, prove that the distance between any two consecutive nodes or antinodes in a stationary wave is ƛ/2.

Write an expression for Newton's formula for the velocity of sound in air. Explain the necessary correction made by Laplace.

Define end correction. Show that, in an open organ pipe, both odd and even harmonics can be produced.

Define natural frequency. Describe an experiment to determine the velocity of sound in air by the resonance air column tube method.

Describe a sound wave as a pressure wave and deduce an expression for the pressure amplitude.

Define beats. Obtain an expression for the beat frequency produced by the superposition of two waves of slightly different frequencies.

What is the Doppler effect in sound? Obtain an expression for the apparent frequency of sound when both source and observer are moving towards each other.

State Huygens law and use it to verify Snell's law.

Define coherent sources of light. Describe Young's double-slit experiment and show that the bright fringes and dark fringes are equally spaced.

Define polarization of light. Show that, μ=tan𝜭p, where the symbols have their usual meanings.

How can you convert a galvanometer into an ammeter (or voltmeter)? Explain.

Discuss the mechanism of metallic conduction. Derive a relation between current density and drift velocity.

State and apply Kirchhoff's rule to measure the unknown resistance of a wire by using the Wheatstone bridge circuit.