IMPORTANT QUESTIONS-II P.U.C.- PHYSICS

IMPORTANT QUESTIONS-II P.U.C.- PHYSICS

I. GEOMETRICAL OPTICS:
1.Obtain an expression for the lateral shift produced by a rectangular glass slab due to refraction
through it? (5M)------+problem
2.What is a normal shift? Obtain an expression for the normal shift produced an object
in denser medium viewed from rarer medium? ( 5M)-------- +problem
3.Write an expression for R.I. In terms of A&D. Of a prism. (2M)
4.Define dispersive power & obtain an expression for it. (4M)
5.Derive the relation connecting n, u v& R for a refraction at a spherical surface for a point
object in a denser medium producing a virtual image.(5M) --- +problem
6.Derive the lens makers formula. (5M)
II. PHYSICAL OPTICS:
1. What is the interference of light? State the condition of constructive & destructive interference in terms
of path difference. (5M)
2. Obtain an expression for interference fringe width in a double slit experiment.(5M)
3. Distinguish between Fresnel & Fraunhofer diffraction of light.(2M)
4.Distinguish between interference & diffraction of light.(2M)
5.State & explain Rayleigh's criteria of limit of resolution .(4M)
6. Write an expression for resolving power of microscope .(2M)
7. Write an expression for limit of resolution &resolving power of telescope .(4M)- +problem
8.Define polarisation of light. Show that reflected & refracted rays are perpendicular to
each other at the polarising angle of incident.(5M)------ +problems
III. ELECTROSTATICS:
1.Distinguish between electric intensity & potential. (2M)
2.State Coulomb's law in electrostatics (2M)
3.State Gauss theorem. Obtain an expression for electric field at any point near the surface
of the charged conductor using Gauss theorem. (5M)
4. State Gauss theorem. Obtain an expression for electric field at any point near the spherical
charged conductor using Gauss theorem. (5M) ------ + problem
5. Derive an expression for the electric potential at a point due to a point charge.(5M) + problem
6. What is capacitance of a capacitor.? (2M)
7. How does capacitance of parallel plate capacitor depends.
8. Obtain an expression for effective capacitance of three capacitors in series or parallel.(5M) +problems

IV. CURRENT ELECTRICITY:
1. State Ohms law. mension its limitations. 2M
2 What is a thermistor? How does resistance of a thermistor vary temp. ?2M
3.Mension two applications of a thermistor?.2M
4. derive the expression for branch currents when two resistors are in parallel. 2M +problems
5. Obtain an expression for the effective resistance of three resistors in parallel . 5M +problems
4. Obtain an expression for the current in a resistance connected across a battery 2M
5. State the Kirchhoffs' laws . 2M
6. Draw the circuit diagrame of Wheatstone's network. Mension its balanced condition.2M
7. obtain the condition for balance of a wheatstone network by applying Kirchhoffs' laws 5M +problems
8. state reduction factor of tangent galvanometer.2M
9. state & explain Laplace law.5M +problems
10. Give the theory of T.G 5M +problems
11. Obtain an expression for the magnetic field at any point on the axis of a circular coil carrying
current.5M +problems
12. Write an expression for the force between two conductors carrying currents. 2M
13. Give the expression for torch on a current acting on a current loop kept in a magnetic field. 2M
14. Give the theory of moving coil galvanometer. 5M +problems
15. How is galvanometer converted in to an ammeter & a voltmeter. 5M +problems
16. State & explain Faraday's laws of electromagnetic induction . 5M
17. State self induction of a coil . Mension its unit. 2M
18. What is meant by impedance of A.C circuit 2M +problems
19. Derive an expression for the alternating e,m,f. When a coil is rotating in a uniform magnetic field. 5M
20. Show that the voltage leads the current by π/2 in A.C circuit containing pure inductance. 5M
+problems
21. W hat is resonance in an A C circuit ?2M
22. . Derive an expression for current in an AC circuit containing series LCR elements. 5M +problems
23. Explain the terms self induction & mutual induction
V. MODEREN PHYSICS
1.Define the term threshold wavelength & stopping potential. (2M)
2.Derive an expression for Einstein's photoelectric equation (5M) +problems
3. Give experimental observed facts of photoelectric effect (5M)
4.Mension two uses of photocell. 2M
5.State & explain postulates of Bohr's theory of Hydrogen atom. 5M
6. derive an expression for the energy of electron in the nth Bohr orbit of the hydrogen atom. 5M +problems

7.Obtain an expression for the velocity & radius of the electron in the nth Bohr orbit of the
hydrogen atom. 5M +problems
8. derive an expression for the frequency of electron in the Bohr hydrogen atomic model. 5M +problems
9.What are the characteristics of nuclear force.2M
10. Explain the characteristics of a nucleus with reference to its size, charge, density & mass 5M
11. Give Einstein's mass energy relation 2M
12. Explain the term mass defect & binding energy curve. 5M +problems
13. distinguish between nuclear fission & nuclear fussion. 5M
14. What is radioactivity? Name the types of radioactive radiations. 2M
15. Give the properties of α ,β & γ rays.
16. Define half life period & mean life? 2M +problems
17. State Soddys group displacement laws 5M
18. State & explain laws of radioactive decay. Deduce an expression for the no. of atoms of radioactive
element at any instant of time . 5M +problems
19. Classify conductor, semi conductor & insulator on the basis of band theory of solid 5M
20. Distinguish between intrinsic & extrinsic semiconductors.2M
21. Distinguish between p- type & n-type semiconductors. 2M
22. What is rectification? Explain with a circuit diagram the working of diode as full wave rectifier. 5M
23. What is rectifier? Explain with a circuit diagram the working of diode as half wave rectifier. 5M
24. What is a transistor? Explain the action of a NPN transistor as an amplifier .5M
25. Distinguish between PNP & NPN transistor.