12th physics Important Questions 2020-2021

 12th physics Important Questions 
12th Physics Important 5Mark Questions 2020-2021 New syllabus
1.what is rectifier ? explain full wave rectifier?
2.Explain the basic elements of an electronic communication system.
3.what are the advantages and disadvantages of Robotics?
4.Explaine mission and absorption spectra with their types?
5.What are electromagnetic waves?write down the properties of electromagnetic waves?
6.Obtain lens maker’s formula and mention it's significance.
7.Derive the mirror equation and the equation for lateral magnification.
8.Discuss the applications of nano material sinvarious fields.
9.Explain the logic symbol,logic equation,truth table of OR,AND,NOT,NOR,
NAND,and EXOR gates.
10.Explain Fizeau method.
11.Obtain the law of radio activity and hence derive the half-life period.
12.explain the .J.Thomson experiment to determine the specific charge of an
13.Explain the construction and working of transformer.
14.Explain the working of a single phase AC generator with necessary.
15.Explain RLC circuit and hence derive an expression for phase angle between the applied voltage and current.
16.Obtain the condition for bridge balance Wheat stone’s bridge.
17.How the emf of two cells are compared using potentiometer.
18.State and discuss the microscopic and macroscopic forms of ohm’s law.
19.Explain the resistances in series and parallel.
20.Explain in detail the construction and working of a Vandegraaff generator.
21.Derive an expression for electric potential due to an electric dipole.
22.Derive an expression for debt of lie wavelength and forelectrons.
23.Electron microscope/Davisson–Get mere experiment.
24.Magnetic field due to straight conductor using Biot savert laworampere’s
circuital law.
25.Explain in detail the construction and working of cyclotron.
26.Axial line/Equatorial line–electrostatics and magnetism.
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