12th Std Physics Important Three Marks

Ln1:

• Derive an expression for electrostatic potential due to a point charge?Ln1
• Obtain the expression for capacitance for a parallel plate capacitor?Ln1
• Obtain the expression for energy stored in a parallel plate capacitor?Ln1
• Write the uses of capacitors.
• Derive the expression for resultant capacitance,when capacitors are connected in parallel?Ln1
• Properties of electric field lines?
• Obtain gauss law from coulomb’s law?
• Differences between coulomb force and gravitational force?
• Capacitors connected in series and parallel?Pg61
• Various properties of conductors in electrostatic equilibrium?pg46

Ln2:

1. Explain the equivalent resistance of a series resistor network?Ln 2
2. Explain the equivalent resistance of a parallel resistor network?Ln
3. what is seebeck effect?State the application of seeback effect?Ln2
4. Define temperature  coefficient of resistance?Ln2
5. Obtain the relation between current and drift velocity?Microscopic model of current?Ln2
6. State kirchoff’s first and second law?

Ln3:

1. Discuss the conversation of galvanometer into ammeter?Ln3
2. Discuss the conversation of galvanometer into voltmeter?Ln3
3. State Biot-Savart’s Law?Ln3
4. Write down the features of Lorentz force?Ln3
5. State flemings left hand rule?Ln3
6. Compare properties of dia,para and ferromagnetic material?Ln3 pg148

Ln4:

1. How will you induce emf by changing the area enclosed by the coil?Ln4
2. Obtain an expression for average power of AC over a cycle?Ln4
3. Mention various energy losses in transformer?Ln4
4. Find out the relationship between voltage and current in an AC circuit containing pure resistor?Ln4
5. Advantages and disadvantages of AC over DC?pg250
6. Motional emf for lorentz force?Ln4 pg206

Ln5:

1. Explain continuous emission spectrum / Absorbtion spectrum?Ln5
2. Explain the Maxwell’s modification of Ampere’s circuital law. Ln5 BB4
3. write short notes on 1.Microwave(Pg275) 2.X-Ray 3(Pg 276).Visible spectrum(light)pg275

Ln6:

1. Deduce the relation between focal length and radius of curvature of a spherical mirror?Ln6
2. State the properties of electromagnetic waves?Ln6
3. State snells’s law/Law of refraction?
4. What is optical path?write down the equation for optical path and mention what each term represents?
5. Obtain the equation for apparent depth?Ln6 17
6. what is total internal reflection?give the condition for the total internal reflection takes place?pg19

Ln7:

1. Discuss about Nicol prism?Ln7 Pg86
2. What is Fresnel’s distance?Obtain the equation for fresnel’s distance?Ln7
3. Differentiate between fresnel and fraunhofer diffraction?Ln7
4. What are fraunhofer lines ?How are they usefulin the identification of elements present in the sun?

Ln8:

1. Give the application of photo cell?Ln8 Pg122
2. A proton and an electron have same de broglie wavelength.which of them possesses more kinetic energy?Ln8 pg129
3. List out the laws of photoelectric effect?Ln8
4. Why electron is preferred over x-ray in microscope?Pg126

Ln9:

1. Write down the drawbacks of Bohr atom model?Ln9
2. Write down the proton – proton cycle of fusion reaction associated with energy generation in stars?Ln9
3. What is meant by half-life period of a radioactive element?Derive an expression for half-life period?Ln9
4. Properties of neutrino?
5. Postulates of bohr atom model?
6. What are the important inference from the average binding energy curve?pg167
7. Discuss the beta decay process with example?Ln9 171

Ln10:

1. 1.State de morgan’s first and second theorem?Ln10
2. 2.Draw the block diagram of basic elements of communication system?Ln10
3. 3.Give circuit symbol,logic operation,Truth table of ALL gate?Ln10
4. 4.Give the Barkhausen conditions for sustained oscillations?Ln10