Some important question of physics class 12 batch 2080

 1:- Define wave motion. Derive the progressive wave equations in a medium.

2:- 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.

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

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

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

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

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

8:- 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.

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

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

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

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

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

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

15:-State the principle of meter bridge. Describe how it is used to determine the resistance of a wire.

16:-What is the principle of a potentiometer? Explain with necessary theory how you would determine the internal resistance of a cell using this principle.

17:-What do you mean by the thermoelectric effect? Discuss the variation of thermo emf in a thermocouple with the temperature change.

18:-State and explain Biot - Savart's law. Use it to find the magnetic field due to a long straight current-carrying conductor.

19:-State Ampere's law. Deduce an expression for the force between two parallel current-carrying wires.

20:-State Faraday's law of electromagnetic induction. Derive an expression for the emf induced in a straight conductor moving at right angles to the direction of a uniform magnetic field.

21:-State Faraday's law of electromagnetic induction. Deduce an expression for the emf induced in a coil rotating uniformly in a uniform magnetic field.

22:-Explain the principle and working of a transformer.

23:-Discuss the condition for the resonant frequency of the LCR alternating current circuit.

Describe the construction and working principle of Millikan's oil-drop experiment to determine the charge of an electron.

Define cross-field. Describe the construction and working principle of J.J. Thomson's experiment to determine the specific charge of an electron.

Define the threshold frequency and work function of a metal. Explain Einstein's photoelectric equation.

Describe the experiment to determine Planck's constant.

State Bohr's postulates for the atomic model. Derive the expression for the radius of an electron bound to a hydrogen atom. (OR, to find the total energy of an electron in nth orbit.)

Explain Bragg's law of diffraction for X - rays.

What is Zener's breakdown? How can a Zener diode be used as a voltage regulator? Explain.

Define mass defect. Explain the significance of the graph of binding energy per nucleon versus the atomic mass number.

State the laws of radioactivity. Derive the relation between the half-life period and decay constant.

Equation of Progressive wave

Wave front and Wavelets: Clear Concepts with Difference

Newton's formula with Laplace's Correction

Light wave and Sound wave with Difference

Stationary wave equation

Laws of transverse vibration in stretched strings

Open Organ Pipe and Close Organ Pipe

Doppler Effect

Pressure amplitude

Reflection and refraction using Huygens Principle

Polarization for Short Question

Young's Double Slit Experiment

Diffraction through single slit

Diffraction grating numerical

Meter bridge

Kirchhoff's law and numerical

Wheat stone bridge principle

Principle of Potentiometer and numerical

Conversion of galvanometer into voltmeter and ammeter

Joule's law

Seebeck experiment

Peltier and Thomson effect

Biot and Savart Law and its applications

Ampere Circuital law for Derivation and Numerical

Hall effect and Moving coil galvanometer

What is Eddy Current? Write down its uses.

LR, RC, LCR series circuit with wave diagram and Phasor diagram and Numerical

Resonant frequency, Power factor and Quality factor

Theory and working of AC generator

Faraday's Laws of Electromagnetic Induction

Motional em

f derivation and Lenz law

Only Numerical of Induced emf in rotating rod (wheel spokes) and wings of airplane

Energy stor