# Class 12 Physics Most Important Questions 2081

## Most Important Questions of Physics Class 12 PDF

[According to new and revised course 2081]

Note : Model Questions have not been published yet, so we still don’t know what type of questions might be asked in the final exams! The download link for the pdf have been provided in this article as well.

Update: Model Questions of Physics have been published now.

The topics are not the same anymore in previous and contemporary syllabus (before 2078) There are some sections added and some are removed. Here is the latest content overview of class 12 physics syllabus!

- Mechanics
- Heat and Thermodynamics
- Wave and Optics
- Electricity and Magnetism
- Modern Physics

Question’s importance level is solely based on the frequency of questions appearing in previous years board exams!

### Mechanics

- Rotational Dynamics
- Equations of Angular Motion and Linear Motion
- Relation between moment of inertia and torque
- Radius of Gyration
- Moment of inertia of thin uniform rod rotating about it’s centre and it’s one end
- Derivation of rotational kinetic energy
- What is torque? Relation between torque and angular acceleration of a rigid body
- Principle of conservation of angular momentum
- Practise 5,7 Numerical Problems from each chapter

### Periodic Motion

- Define SHM, derive expression for energy of the particle in SHM
- Derive the expression of time period for vertical oscillation of a mass suspended from coiled spring
- Expression of time period of simple pendulum
- Practise 5,7 Numerical Problems from each chapter

### Fluid Statistics

- Definition and relation between surface tension and surface energy
- State and Explain Stoke’s Law and use it to find Coefficient of viscosity of given liquid
- Why should the meta Centre Iie above the centre of gravity of a floating body?
- Equation of continuity and its application
- Newton's formula for viscosity of liquid
- Bernoulli's equation and its application

### Heat and thermodynamics

- First Law of thermodynamics
- Expression of work done during isothermal process
- 2. Work done during adiabatic process
- 3. Prove : PV ^ (gamma) = constant
- 4. PV diagram of adiabatic and isothermal process

### Second law of thermodynamics

- Define heat engine and its efficiency
- Define internal combustion engine
- Describe the working of a petrol engine with PV diagram
- Describe carnot cycle with PV diagram
- Explain second law of thermodynamics
- Numericals

### Wave and optics

- Difference between stationary and progressive wave
- Derivation of stationary and progressive wave
- How are stationary waves formed? (Describe with figure)
- Numericals related to y= a sin theta omega T
- Newton's formula of velocity of sound in gas
- Laplace correction
- Factors affecting velocity of sound
- Open organ pipe and closed organ pipe
- Resonance tube
- End correction in pipes
- Intensity of sound derivation
- Beat formation
- Doppler’s effect and numericals
- Laws of transverse wave in strings
- Young's double slit experiment
- Polarisation / brewster law
- leHyugen’s Principle
- Diffraction through single slit

Also Read: Class 12 Chemistry Important Questions PDF

### Electricity and Magnetism

- Kirchoff’s Law and use it to find out the balanced condition of wheatstone bridge
- AC working principle
- Combination of resistors ie. series and parallel
- Shunt
- Potentiometer and use of Potentiometer
- Conversion of galvanometer into ammeter or Voltmeter
- Joule's law of heating
- Biot Savart law and its application
- Ampere’s law and and its application
- relation between Drift velocity and current velocity
- Variation of resistance with temperature
- Seebeck effect and Thermocouple
- Series circuits containing combination of resistance capacitance and inductance
- Choke coil
- Faraday's law of electromagnetic induction
- Lenz law, How is lenz law following conservation of energy?
- Prove: E=Blv
- Hall effect and hall Voltage law
- Moving coil galvanometer and its application
- EMF induced in a coil rotating in a uniform magnetic field and rectangular coil
- Relative permeability and susceptibility
- Tangent law & ferromagnetism

### Modern Physics

- Thomson's experiment to calculate specific charge of an electron
- Bohr's postulates and find the energy of electron of nth orbit
- Radius of nth bohr’s orbit
- Laws of radioactive disintegration
- Millikan Oil Drop experiment
- Gaseous discharge
- Full Wave Rectifier
- Einstein's Photoelectric equation