2nd PUC Question Papers Physics 2006-2010

7/31/2019 2nd PUC Question Papers Physics 2006-2010

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SECOND PUC ANNUAL EXAMINATION APRIL2006PHYSICS

Time : 3hr Maximum Marks : 90

PART AI Answer ALL of the following: 10 x 1 = 101. Define dispersive power of a medium for a pair of colours.2. Which type of wavefront is used in Fraunhoffer diffraction?3. Mention any one factor on which resolving power of a telescope depends.4. What is the value of speed of light obtained in Michelsons rotating mirror experiment?5. State Gauss theorem in electrostatics.6. Write the colour code for a resistor of resistance 120.7. What is the magnitude of the force exerted on a charge which is moving along the direction of the

magnetic field?8. What is M.R.I.?9. Write the circuit symbol of AND gate.10. Give an example of a gel.

PART B

II Answer any TEN of the following: 10 x 2 = 20

11. What is a thin prism? Write the expression for deviation produced by thin

12. Mention the significance of Hertzs experiment and write the expression for speed of light in vacuum interms of permeability and permittivity.

13. The diameter of the objective of a telescope is 1.2 m. If the wavelength of light used is 546 nm,calculate the limit of resolution of telescope.

14. Give the representation of plane polarised and unpolarised light.15. Write the expression for Coulomb force between two point charges separated by a distance in vector

form and explain the terms.16. Obtain the expression for capacity of a spherical conductor.17. A current loop of area 20 x 10-4 m2 carrying a current of 0.2 ampere is placed at an angle of 60 with a

magnetic field of strength 4 x 10- 2T. Calculate the torque exerted on it.18. State Faradays laws of electromagnetic induction.19. Distinguish between emission and absorption spectra.

20. Arrive at the expression for de-Broglie wavelength.21. Give any two applications of liquid crystals.22. What are leptons? Give an example.

PART CIII Answer any ONE of the following: 1 x 5 = 523. What is normal shift? Obtain an expression for the normal shift produced, when an object in a denser

medium is viewed normally through air.24. Give the theory of interference of light and hence arrive at the condition for constructive and destructive

interference in terms of phase difference.

IV Answer any TWO of the following questions: 2 x 5 = 10

25. Derive the expression for magnetic field at any point on the axis of a circular coil carrying current.26. Give the construction and working of a transformer. Mention any one source of power loss intransformer.

27. Explain the experimental observations of photoelectric effect.

V Answer any FOUR of the following:4 x 5 = 20

28. Arrive at the expression for radius of first Bohr orbit of hydrogen like atom.29. Derive N = N0 e

-t. Hence define decay constant.30. i) Classify conductors, semiconductor and insulators based on band theory of solids.

ii) What are Intrinsic and extrinsic semiconductors?

VI Answer any THREE of the following: 3 x 5 = 1531. A small air bubble is found 0.04m inside the glass sphere of refractive index 1.5. When viewed normally

from outside it is seen at a depth of 0.03 m. Calculate the radius of curvature of glass sphere.


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32. Two charges 5C and 5C are placed at points A and B, which are separated by a, distance of 0.6mFind the electric field intensity at a point P on the perpendicular bisector of AB at a distance of 0.04 mfrom its middle point.

33. Two resistors of resistances 2 and 4 are connected in parallel. Two more resistors 3 and 6 arealso connected in parallel. These two combinations are in series with a battery of e.m.f. 5 V and internalresistance 0.7. Calculate the current through 6 resistor.

34. Calculate the binding energy of an alpha particle from the following data and express it in MeV.Mass of helium nucleus = 4.00260 amu

Mass of neutron = 1.008665 amuMass of proton = 1 007825 amu.VII Answer any ONE of the following: 1 x 5 = 5

35. Describe an experiment to determine the horizontal component c Earths field (BH) using Tangentgalvanometer.

36. Explain how to determine experimentally the self-Inductance of a coil by direct method.

VIII Answer any ONE of the following: 1 x 5 = 537. The following readings were observed while determining the refractive Index of the material of convex

lens. Calculate refractive index by finding focal length by shift method and radii curvatures usingBoys method:

Sl No. Distance between screen and object ( m) Shift In the position of lens (m)

1 0.85 0.2062 0.90 0.3003 0.95 0.377

Given x1 = 0.10m, x2 = 0.10m38. Calculate the resistivity of the given material of wire using the following data obtained in meter bridge

experiment.The length of the wire 0.40 m., The radius of the wire = 0.20 x 10-3m.

Sl. No. Rsistance unplugged in

right gap ( )

Balancing length (m)

1 2 0.4282 3 0.333

3 4 0.272PART DXI Answer any ONE of the following: 1 x (4 + 4 + 2) = 1039. a) Parallel plate capacitor stores 20 C charge when connected across a battery. When the gap

between the plates is filled with a dielectric it stores 50 C of charge. Calculate the dielectricconstant of the material inserted.

b) i) What are coherent scattering and incoherent scattering?ii) Mention any two applications of LASERS. 4

c) Define ampere by writing the expression for force between two parallel conductors carrying currents. 2

40. a) It is found that ;a solution of cane sugar of length 0.15 m rotates the plane of polarisation through16 30. If the specific rotation of cane sugar is 0.011radm 2Kg-1, calculate the concentration of the

solution. 4b) State and explain Kirchhoffs laws for electrical network.c) Define phase and frequency of A.C. 2

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SECOND PUC ANNUAL EXAMINATION JUNE2006PHYSICS


PART A

I Answer ALL of the following: 10 x 1 = 101. Define power of a lens

2. Who proposed electromagnetic theory of light?3. What is diffraction of light?4. Is speed of light same in all optical media?5. What is an equipotential surface?6. What is the nature of force between two long parallel wires carrying current in the same direction?7. What is the principle of a transformer?8. Why does the sky appear blue?9. What are leptons?10. Draw the circuit symbol of npn transistor.

PART B

II Answer any TEN of the following: 10 x 2 = 20

11. Write prism formula with explanations of symbols12. Give two differences between Fresnel and Fraunhofer diffractions.13. Define specific rotation of an optically active solution and mention Its SI unit14. What is an electric dipole? Define dipole moment15. A 20 PF capacitor is connected to 100 V battery. What is the energy stored in the capacitor?16. Write the expression for the magnetic field at a point on the axis of a solenoid and explain the terms.17. What should be the resistances of an ideal ammeter and an ideal voltmeter?18. State Faradays second law of electromagnetic induction and name the scientist who gave the direction

of induced e.m.f.19. Mention two types of electron emission.20. What are matter waves? Write the expression for the de Brogile wavelength of photon.

21. Define mass defect and binding energy of a nucleus..22. Mention any two groups of thermotropic liquid crystals.

PART C

III Answer any ONE of the following: 1 x 5 = 523. Derive lens-makers formula24. State Brewster law Show that the reflected and refracted rays are perpendicular to each other at

polarising angle of incidence

IV Answer any TWO of the following questions: 2 x 5 = 1025. Obtain the balancing condition of a Wheatstone network using Kirchhoffs laws.

26. Derive an expression for current flowing in a series LCR a.c. circuit, and hence write the condition forelectrical resonance.27. What is photoelectric effect? Draw a neat labelled diagram of the experimental set-up to study

photoelectric effect Mention any two experimental results.

V Answer any FOUR of the following: 4 x 5 = 2028. Write any four differences between nuclear fission and nuclear fusion. What is a nuclear reactor?29. State Soddys group displacement laws. Obtain the expression for half-life of a radioactive sample using

decay law.30. What is rectification? With a neat circuit diagram, explain the construction and working of a half-wave

rectifier along with suitable waveforms.

VI Answer any THREE of the following: 3 x 5 = 1531. A transparent glass cube, of side 20 cm contains a small air bubble. When it is viewed directly from thenearest face it appears to be at 0.05cm from that face and when it is viewed through the opposite face,the air bubble appears to be 7.5 cm from that face. Calculate the position of the bubble from the nearestface and also the refractive index of glass.


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32. ABCD is a square of side 1 m. Point charges of + 2 x 10-10 C, -4 x 10-10C and + 8 x 10-10 C are placed atcorners A, B, C respectively. Calculate the work done in transferring a charge of 10C from D to thepoint of intersection of diagonals.

33. A circular coil of 10 turns and mean radius of 0.1 m is kept with its plane in the magnetic meridian. If acurrent of 2 A passes through it, calculate the resultant magnetic field at its centre. (BH = 4 x 10

-5 T)34. The first member of Balmer series of hydrogen spectrum has wavelength 6563 Compute the

wavelength of second member. Also calculate the series limit of Balmer series

VII Answer any ONE of the following: 1 x 5 = 535. Describe, the experiment to determine the focal length of lens of convex lens by Shift method.36. Describe the experiment to determine the internal resistance of a given cell using potentiometer.

VIII Answer any ONE of the following: 1 x 5 = 5

37. Calculate the specific resistance of the material of the given wire using following data:Length of the wire= 0.55mDiameter of the wire = 0.30 mm

Trial No. Resistance In rightgap()

Balancing length (m)

1 3 0.727

2 5 061538. Calculate the self-inductance of the coil by direct method using the following data:

Trial No. DC Part AC PartVoltmeter

reading(Volt)Ammeter

reading (A)Voltmeter

reading(Volt)Ammeter

reading(A)1 1.5 25x10- 2.5 26x10- 2 1.9 36x10- 3.0 29x10-

Frequency of a.c. = 50 Hz

PART DXI Answer any ONE of the following: 1 x (4 + 4 + 2) = 10

39. a) In Youngs double slit experiment using a source of light wavelength 5000 A, the bandwidth obtainedis 0.6 cm. If the distance between the screen and slit Is reduced to half, what should be the wavelengthof the source to get fringes 0.003 m wide?b) Derive the expression for equivalent capacitance of three capacitors in parallel.

c) Define resolving power of microscope and write an expression for the same.2

40. a) Two resistors of 2 and 3 are connected in parallel to a cell of e.m.f. 2 V. Calculate the maincurrent passing through the circuits and current through individual resistors.

4b) i) What is LASER ? Write one application of Laser.

ii) Draw circuit symbols of OR gate and NAND gate. 4c) Write the expression for torque acting on a current-carrying loop in a magnetic field. When is it

maximum?2

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PART A

I Answer ALL of the following: 10 x 1 = 10

1. What is the principle of an optical fibre?2. Write the condition for constructive interference In terms of path- difference.3. Define specific rotatory power of an optically active solution.4. Name the scientist who determined the speed of light most accurately.5. What happens to the magnitude of the force between two charges if a glass plate is interposed between

them?6. Mention the S.I. unit of resistivity.7. Does a neutron experience a force in a magnetic field?8. What are Fraunhofer lines?9. Is proton a Lepton or a Hadron?10. Write the logic symbol of NAND gat

PART B

II Answer any TEN of the following:

10 x 2 = 20

11. Mention any two factors on which lateral shift depends.12. Name the theories of light in support of its wave nature.13. Calculate the resolving power of telescope whose limit of resolution is 2.44 x 10 -6rad.14. State and explain Gauss theorem.15. With a labeled diagram, write the expression for the capacitance of a spherical capacitor.16. In the figure shown below find I1 and I3.

17. Define terms Declination and Inclination at a place.18. Write one advantage and one disadvantage of eddy currents.19. What are matter waves? How does the de Broglie wavelength of an electron change if its velocity

increases?20. What are Stokes and anti-Stokes lines in Raman spectrum?21. Give any two differences between p type and n type semiconductors.22. Mention two major classifications of liquid crystals.

PART CIII Answer any ONE of the following:

1 x 5 = 523. Derive an expression for the refractive index of the material of a prism in terms of angle of the prism

and the angle of minimum deviation.24. What is polarising angle ? Show that the reflected and refracted light rays are mutually perpendicular to

each other at the polarising angle of incidence.

IV Answer any TWO of the following questions:2 x 5 = 10

25. Derive an expression for the force between two parallel straight conductors carrying current and hencedefine ampere.

26. State Faradays laws of electromagnetic induction. Derive an expression for emf induced in a rodmoving in a uniform magnetic field.

27. What is photoelectric effect? Mention the experimental conclusions on photoelectric effect.


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V Answer any FOUR of the following: 4 x 5 = 2028. Define (i) mass defect and (ii) binding energy of a nucleus. Show that 1 amu = 931 MeV.29. State the law of radioactive decay and hence prove that N = N0 e

-t with usual notations.30. Explain the formation of P - N junction with a diagram. When is the P - N junction said to be (i) forward

biased and (ii) reverse biased?VI Answer any THREE of the following: 3 x 5 = 1531. A glass sphere of radius 15 cm contains a small air bubble at a distance of 6 cm from its centre. When

viewed along its diameter from the nearest side, the bubble appears to be 7.5 cm. Calculate the

refractive Index of glass and the apparent distance of the bubble from the farthest side.32. A metal sphere of radius 0.01 m is charged to a potential of 45 kV and kept at the corner B of a right-angled triangle ABC (AB = 0.3 m, BC = 0.4 m and ABC = 90). Calculate the work required to shift acharge of 2 x 10-6C from corner C to corner A of the triangle.

33. Two circular coils of mean radii 0.1 m and 0.05 m consisting of 5 turns and 10 turns respectively arearranged concentric to one another with their planes at right angles to each other. If a current of 2A ispassed through each of them, calculate the magnitude of the resultant magnetic field at their commoncentre.

34. An electron in hydrogen atom in the ground state is excited to n = 4 state. Calculate the energyabsorbed and the wavelength of the electromagnetic radiation emitted when the atom comes to groundstate. (Ground state energy of H2 = - 13.6 eV)

VII Answer any ONE of the following: 1 x 5 = 535. Describe an experiment to determine the temperature coefficient of resistance of a thermistor using

meter bridge.36. Describe how you determine the self-inductance of a coil by direct method using A.C/D.C. meters.VIII Answer any ONE of the following:37. Using the following experimental observations, calculate the refractive Index of the material of convex

lens.Shift Method

Trial No. D(m) S (m)1 0.75 0.3352 0.90 0.5 19

Boys MethodSurface Radius of curvature(m)

1 0.1482 0.150

38. The following readings are recorded in an experiment to find the reduction factor of a tangentgalvanometer.a) Radius of the coil of T.G. = 7.956 x 10-2 m. b) No.of turns = 2.

Trial No. Current (A)Deflection (degree.)

1 2 3 41 1.5 30 30 31 31

2 2.0 38 38 39 39Find BH at the place.

PART DXI Answer any ONE of the following: 1 x (4 + 4 + 2) = 1039. a) In Youngs double-slit experiment the two slits 0.18 mm apart are illuminated by light of wavelength

589.3 nm. Calculate the distance of (1) 5 th bright and (ii) 3rd dark fringes from the mid point of theinterference pattern obtained on a screen kept 0.6 m away from the slits. 4

b) Obtain the expression for effective capacitance of three capacitors connected in parallel. 4c) Give two differences between interference and diffraction. 2

40. a) Two resistances of 3 and 6 are connected in parallel with a battery of emf 6V and internalresistance l. Calculate the main current through the circuit and the currents through 3 and 6.4

b) What is (i) optical pumping and (ii) population inversion, as related to LASER? Mention twocharacteristics of LASER. 4

c) What is a choke ? Mention one use of it. 2

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PART AI Answer ALL of the following: 10 x 1 = 101. What is a thin prism?2. Who proposed corpuscular theory of light?3. Mention any one application of polarolds.

4. Write down the formula for speed of light obtained by Michelsons rotating mirror experiment.5. Write any one property of charge.6. How does the magnetic field due to a current carryliig conductor vary with current?7. Mention the unit of Inductance.8. Why does sun appear red at dawn and dusk?9. Give an example of hadron.10. What is the basic function of a transistor?

PART BII Answer any TEN of the following:

10 x 2 = 2011. A crown glass prism has refractive indices 1.585 and 1.575 respectively for blue and red colours. Find

Its dispersive power.12. Arrive at an expression for de Brogue wavelength.13. Distinguish between Fresnel and Fraunhoffer diffractions.14. Define electrostatic potential and mention its unit.15. Draw the neat diagrams of two capacitors connected in series and parallel combinations.16. A carbon resistor has red, black, red and gold coloured bands on it, find its resistance.17. State and explain Kirchhoffs first law of electrical network.18. Mention any two sources of power loss in transformers.19. Write down the principle and one application of electron microscope.20. Mention any two properties of lasers.21. Draw the circuit symbol of NAND gate and write its truth table.

22. Explain how emulsions are prepared.

PART CIII Answer any ONE of the following: 1 x 5 = 523. With a diagram explain in brief, the total internal reflection. Define critical angle and mention the two

conditions for total internal reflection.24. State Brewsters law. Prove that the reflected and refracted rays a mutually perpendicular to each other

In case of polarisation by reflection.

IV Answer any TWO of the following questions: 2 x 5 = 1025. What is tangent law? Give the theory of tangent galvanometer and hence define reduction factor.26. State Flemings left hand rule. Show how a moving coil galvanometer can be converted into an

ammeter and a voltmeter with suitable expressions and circuit diagrams.27. Define threshold frequency, stopping potential and Work function. Mention any two applications of

photocells

V Answer any FOUR of the following: 4 x 5 = 2028. Write down any two Bohrs postulates for hydrogen, atom. Mention an expression for the radius of nth

orbit. Draw the energy level diagram for Lyman series.29. Write a note on nuclear power reactor with suitable diagram30. What is a semiconductor diode? Explain with circuit diagram, how the full wave rectification is obtained

using semiconductor diodes Draw the Input and output waveforms

VI Answer any THREE of the following: 3 x 5 = 1531. An equi convex lens has a focal length of 0.10 m and the radius of one curved surface is 0.12 m. Find

the refractive Index of the material of the convex lens.32. A hollow spherical conductor of radius 0.2. m has a charge of 4 nC. Find the potential due to thischarged sphere on its surface, inside the surface and at a distance of 0.25m outside from its surface.

33. An ac source of 220 V, 50 Hz is connected to a series combination of 20 resistor, 5 C capacitor and2 mH inductor respectively. Calculate the current through the combination.


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34. The activity of a sample of polonium ( 84Po210 ) of half life 138 days is 5mCi. Find the mass of the

84Po210 sample. (Avogadro number = 6.023 x 1023 )

VII Answer any ONE of the following: 1 x 5 = 535. Describe an experiment to find the dispersive power of a prism using spectrometer. (Assuming that the

angle of prism is given)36. Explain how the specific heat of water is determined in laboratory by Joules calorimeter.

VIII Answer any ONE of the following:37. Using two resistances the following readings were observed while verifying the law f combination ofresistances connected in series. Verify this law.

Given R1 = 4 , R2 = 6Trial No. Voltmeter reading V in volts Ammeter reading I in mA

1 1.5 2502 2.0 2003 2.5 250

38. Find the value of BH using the following data obtained In tangent given Circumference of the coil C =0.50 m.

No.of turns = 5

Trial No. Current through TG in (A)Deflection (degree.)

1 2 3 41 0.8 41 42 42 412 1.0 46 47 47 46

PART DXI Answer any ONE of the following:

1 x (4 + 4 + 2) = 1039. a) In a Youngs double-slit experiment, the width of 10 fringes observed is 0.002 m and the slits are

separated by a distance 0.002 m. Find the distance between slits and screen when a light of

wavelength 6000 is used. 4b) Arrive at an expression for energy stored in a capacitor.4

c) Graphically represent the just resolved and well resolved conditions in case of Rayleighs criterion. 2

40. a) Arrive at an expression for an effective resistance when three resistors are connected in parallel. 4b) Draw a labelled diagram of Dunnigtons method to find e/m of an electron. Hence write the

expression for e/ m with explanation. 4c) Distinguish between a.c. and d.c. 2

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SECOND PUC ANNUAL EXAMINATION MARCH2008PHYSICS


PART A

I Answer ALL of the following: 10 x 1 = 101. What is the deviation produced by a thin prism of angle 8 and of refractive index 1.5?

2. Name a phenomenon which cannot be explained by considering light as a wave.3. Give an example for interference of light in a thin film.4. Mention an example to show the importance of speed of light.5. Write the formula for the capacitance of a spherical capacitor when its outer conductor is earthed.6. Define magnetic dip at a place.7. What is the relation between r.m.s. and average value of sinusoidal A.C. voltage?8. Give an example showing the conversion of energy into mass.9. Which is the particle emitted along with electron when a neutron is converted into proton in a nucleus?10. Write the circuit symbol of OR gate.

PART BII Answer any TEN of the following: 10 x 2 = 2011. What are the conditions for a pair of thin prisms to produce dispersion without deviation?12. Draw the neat diagram of experimental set-up for Fraunhofer diffraction at a single slit.13. What are elliptically polarised and circularly polarised lights?14. State Coulombs law and define unit charge.15. An electric dipole of moment 2 x 10-8 coulomb-m is placed in an electric field of 5 x 10-5 N/C , with its

axis making an angle of 30 with the field. What is the torque acting on the dipole?16. What is superconductivity? Define critical field.17. State and explain Klrchhoffs first law of electrical network.18. Express Laplaces law in mathematical form and explain the symbols.19. Name any two advantages of A.C.20. What is Raman effect? What type of scattering Is it?21. Mention any two properties of LASER beam.

22. What is a photodiode? In which biasing does it work?PART C

III Answer any ONE of the following: 1 x 5 = 523. Derive an expression for Lateral Shift produced when a ray of light passes through a parallel sided

glass slab.24. i) Write any three differences between Ordinary ray and Extraordinary ray.

ii) Mention any two applications of polaroids.

IV Answer any TWO of the following questions: 2 x 5 = 1025. Define e.m.f. and internal resistance of a cell. Obtain an expression for current In a simple circuit

consisting of a cell and an external resistance using Ohms law.

26. Give the theory of moving coil galvanometer.27. i) Explain the principle of Dunningtons method of finding

e

m

of an electron.

ii) Write Einsteins photoelectric equation. Using that explain any two experimentally observed factsabout photoelectric effect.

V Answer any FOUR of the following: 4 x 5 = 2028. i) Explain nuclear fusion with an example.

ii) What is the principle of a nuclear reactor ? Mention any two methods of disposal of nuclear waste.29. Define decay constant and half-life of a radioactive substance. Derive an expression for hall-life in terms

of decay constant.

30. With a circuit diagram, explain the action of a npn transistor as an amplifier in CE mode.


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VI Answer any THREE of the following: 3 x 5 = 15

31. Focal length of a convex lens is 0.1 m. A liquid lens is formed between a plane surface and one face ofthis lens of radius of curvature 0.12m. The converging combination formed is found to have a focallength 0.18 m. Calculate the refractive index of liquid.

32. Two capacitors of capacitances 2 F and 4 F are connected in series across a 6 V battery. What is thepotential difference across each capacitor? Also calculate the total energy stored in the combination.

33. An A.C. source of 250 V, 50 Hz is connected to a circuit consisting of an electric lamp rated 100 W, 50V and a capacitor in series. What should be the capacity of the capacitor to work the lamp with rated

value?34. When certain energy is supplied to hydrogen atom, electron jumps from n = 1 to n = 3 state. Find

i) the energy absorbed by the electronii) wavelength of radiation emitted when the electron jumps back to its initial state.(Energy of electron in first orbit = - l3.6 eVPlanks constant = 6 x 10-34 JsCharge on electron = 1.6 x 10-19 CSpeed of light in vacuum = 3 x 108 ms-1.

VII Answer any ONE of the following: 1 x 5 = 535. Describe an experiment to determine the dispersive power of the material of a prism for any two colours

(Assume that the angle of prism is given).36. Describe an experiment to draw the forward bias characteristics of a semiconductor diode and hence to

determine forward bias resistance.

VIII Answer any ONE of the following:37. The following readings were observed while determining the temperature coefficient of resistance of a

thermistor using meter bridge.Temperature (C) Resistance in right gap( ) Balancing length(m)

30 150 0.52535 150 0.479

Calculate the temperature coefficient of resistance of the thermistor.

38. Determine the current sensitivity of a pointer galvanometer from the following observations recorded inan experiment:Resistance of galvanometer = 100 e. m.f. of the cell = 1.5 V

Trial No. r( ) R( (div)1 1 40 222 1 55 163 1 74 12

(Note : Galvanometer Is connected across r)PART D

XI Answer any ONE of the following: 1 x (4 + 4 + 2) = 1039. a) In Youngs double-slit experiment distance between the slits is 1 mm The fringe width is found to be

0.6 mm. When the screen is moved through a distance of 0.25 m the fringe width becomes 0.75mm. Find the wavelength of the light used. 4

b) Define electric intensity and electric potential. Obtain the relation between them. 4c) Write the expression for resolving power of a microscope and explain the terms. 2

40. a) A current of 5 mA passing through a coil of 10 turns produces a magnetic field of 6.28 x 10-8 T at thecentre of the coil. Calculate the radius of the coil. 4

b) With a neat diagram, & plain the working of G.P. Thomsons experiment. 4

c) What is an emulsion ? Give an example for it. 2

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PART- AI Answer all the following questions: 10 x 1 = 10

1. What is meant by dispersion of light?

2. Give the condition in mathematical form for destructive interference in terms of path difference.3. Define limit of resolution of a microscope.4. What is the aim of Michelson's rotating mirror, experiment?5. State Coulomb's law in electrostatics.6. Give the principle on which 'meter bridge' works.7. State Lenz's law.8. Nuclear forces exhibit saturation properties.' What does this statement mean ?9. Give an example of Hadrons.10. What is half-adder?

PART- BII. Answer any ten of the following questions: 10 x 2 = 20

11. Write an expression for refractive index of the material of the prism in terms of its angle. Is the

expression true for all the positions of the prism?12. When does light possess particle nature and wave nature?13. Give two differences between Fresnel diffraction and Fraunhoffer diffraction.14. Write the expression forspecific rotation for a .slab of optically active solid and explain the terms.15. What is meant by 'electric dipole' and 'electric dipole moment'?16. Mention any two factors on which the capacitance of a cylindrical capacitor depends.17. Draw Wheatstone's network and write the condition in mathematical form forits balance.18. What is meant by 'magnetic dipole moment' of current loop? Write its S.I. unit.19. An inductor of self-inductance 12 mH is in an AC circuit. Find its inductive reactance if an AC current

with frequency 50 Hz flows through it.20. What is line absorption spectrum? Give an example.21. Calculate the photoelectric work function for a metal of threshold wavelength 5400.

Given: Planck's constant h =6.625 x 10- 34 Js-1,Speed of light in vacuum c = 3 x 108 ms-1.

22. What are emulsions? Give an example.PART- C

III Answer any one of the following questions:l x 5 = 5

23. Define power of a lens. Write its S.I. unit. What is meant by linear magnification produced by a .lens ina direction perpendicular to its axis? Write the expression for equivalent focal length of coaxialcombination of two thin lenses separated by a finite distance and explain the terms.

24. What is dichroism? Give an example. Write any three applications of polaroids.

IV Answer any twoof the following questions:2 x 5 = 10

25. Derive the expressions for branch .currents when two resistors are connected in parallel.26. What is meant by alternating current? Derive the expression for sinusoidal e.m.f induced in a coil

rotating with uniform angular speed in a uniform magnetic field.27. With a neat labeled diagram, explain the working of G.P. Thomson's experiment to confirm matter

waves.V Answer any twoof the following questions :

2 x 5= 1028. Give Bohr's postulates. Mention a limitation of Bohr's theory.29. Define a.m.u. and eV. Show that 1 a.m.u. = 932 MeV.

Given: Avogadro number N =6.022 x 1023, Speed of light in vacuum C = 3 x 108 ms- 1 and1eV=1.602 x

10

-19

J.30. What is p-njunction diode? What are 'light emitting diode' and 'photo-diode'? Mention an applicationeach of 'light emitting diode' and 'photo-diode'.


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VI. Answer any threeof the following questions: 3 x 5=1531. A ray of light is incident on one of the faces of a parallel sided glass slab of thickness 12 m at an

angle of incidence 51 30 '. calculate the lateral shift produced.Given: Refractive index of the glass slab = 1.562.

32. How many electrons have to be removed from a metal sphere such that it acquires a charge of 6nC?Calculate electric intensity at a point 0.06 m from the centre of the charged sphere when it is placed invacuum.

33. Find the magnitude of magnetic induction at a point 0.06 m from the centre and along the axis of a

circular coil carrying a current of 2 A. Also calculate the magnitude of magnetic induction at the centreof the coil.Given: Number of turns in the coil 20, Mean radius of the coil = 0.05 m.

34. Activity of 1 gm of raclIum-226 is 3.7 x 1010 disintegration s-1.Calculate the half-life of radium-226 in seconds.Given: Avogadro number = 6.022 x 1023.

VII Answer any ONE of the following: 1 x 5 = 5

35. Describe an experiment to determine the dispersive power of material of prism by measuring its angleand angles of minimum deviations for any two colours using a spectrometer.

36. Describe an experiment to draw forward bias characteristics of semiconductor diode.

VIII Answer any ONE of the following: 1 x 5 = 5

37. Determine the temperature coefficitent of resistance of the thermistor using the following data:

Temperature Balancing length

28C 0.682

64C 0.368

Calculate the current sensitieness of a given galvanometer using the following data:

e.m.f of the given cell = 1.32V

Resistance of the given galvanometer = 210.

Resistance r in Rsistance R in Deflection in divisions

1 102 6

1 50 12

1 38 16

PART D

XI Answer any ONE of the following: 1 x (4 + 4 + 2) = 10

38. a)Calculate the distance between the centers of 4 th and 7th bright fringes in an interference patternproduced in Youngs double slit experiment.

Given : Separation between slits =1.1x10-3m

Wavelength of light used = 589.3nm

Distance of the screen from the slits = 1.3mb)Mention any four applications of capacitors. 4

c)What is meant by superconductivity and critical temperature of a super conductor?. 2

39. a) Determine the small resistance to be connected in a parallel with a galvanometer of resistance 50in order to convert it into an ammeter of range 0 50mA.

Given: current required to produce full-scale deflection in the galvanometer is 1.5mA. 4

b) Mention any four applications of Lasers.

c) What is meant by coherent scattering and incoherent scattering?

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13/21


SECOND PUC ANNUAL EXAMINATION MARCH2009PHYSICS


PART - A

I Answer all of the following questions : 10 x 1 = 10

1. What is dispersion of light ?

2. Name the scientist who confirmed the existence of electromagnetic waves.3. State Brewsters law.

4. Give the formula for speed of light in Mchelsons experiment when rotating mirror with ten faces areused

5. What is the force between two point charges which are 1C each separated by 1 m in air?

6. What is thermistor?

7. At which point on the axis of a circular coil carrying current, the magnetic field is maximum?

8. Give an example for coherent scattering.

9. Write the truth table for NOR gate.

10. What is foam?

PART - B

II Answer any ten of the following questions: 10 x 2 = 20

11. Calculate the angle of incidence for a ray of light to have minimum deviation of 39 40/ in equilateralprism.

12. Write two differences between diffraction pattern and interference pattern

13. Mention any two uses of polaroids.

14. Give the expression for potential energy of a system of three charges.

15. Find the effective capacitance between A and C in the following figure:

16. What principle is involved in the

(i) Kirchhoffs First law,

(ii) Kirchhoffs Second law?

17. Write the expression for torque on a current loop placed in a uniform magnetic field and explain theterms used.

18. Mention any two causes of power loss in transformer.

19. What are Fraunhofer lines? What is the importance of studying Fraunhofer olines?

20. What is population inversion ? How can it be achieved?

21. Write the quark model for proton and neutron.

22. Write two differences between collector region and emitter region of a transistor.

PART - C

III Answer any one of the following questions:

23. Obtain Lens-makers fomula.

24. Give the theory of interference and hence obtain the condition for constructive interference in terms ofpath difference and phase difference.

1 F 1 F

1 F

1 F

1 F

A B

CD


14/21


IV Answer any two of the following questions: 2 x 5 = 10

25. Obtain the expression for effective resistance of three resistors in parallel.

26. Derive the expression for sinusoidal e.m.f and represent graphically the variation of e. m. f. with time.

27. Obtain the expression for energy of an electron in the nth orbit of hydrogen like atom assuming theexpression for radius.

V Answer any two of the following questions :

28. a) Write any three characteristics of nuclear forces.

b) Define the terms nuclear chain reaction and critical size.29. a) What is natural radioactivity?

b) State and explain soddys group-displacement law.

30. a) Give three differences between p-type and n-type semiconductors.

b) What is p-n junction ? Which property of p-n junction is used in rectification?

VI. Answer any three of the following questions: 3 x 5 = 15

31. A luminous point object is placed at a depth of 0.5 m inside a liquid. A circular patch of light of radius0.05675 m is formed on the surface. Find the critical angle and R.I for the liquid.

32. Four charges +Q, +2Q, + 3Q and +4Q are placed at the corners of a square ABCD of side 0.1mrespectively. The intensity of electric field at the centre of the square is 5.1 x 103 NC1.Find the value

of Q.33. A battery of e.m.f. 12 V and internal resistance 2 is connected in series with a T.G coil of

resistance 4 . The number of turns is 2 and radius of the coil is .078 m. The angle of deflection is45. Calculate the reduction factor of the T.G. and BH at the place.

34. For a metal the maximum wavelength required for photoelectron emission is 210 nm. Find the workfunction. If radiation of wavelength 150 nm falls on the surface of the given metal, find themaximum kinetic energy of the emitted photoelectrons.

(Plancks constant = 6.625 x 1034 Js velocity of light in vacuum is 3 x 108 ms1.)

VII. Answer any one of the following questions : 1 x 5 = 5

35. Describe an experiment to determine the refractive index of the material of a convex lens by finding

its focal length by shift method and radius of curvature by Boys method.36. Describe an experiment to convert a given galvanometer into voltmeter of given range.

VIII. Answer any one of the following questions : 1 x 5 = 5

37. In an experiment to find the resistivity of the material of the wire by using meter bridge, the followingreadings are recorded. Using the data, calculate the resistivity of the material of the wire. Length ofthe resistance wire = 0.5 m

Diameter of the resistance wire = 0.33 mmT.N. Resistance in the right gap ( ) Balancing length (m)

1 5 0.545

2 7 0.461

38. The following readings were obtained in finding the specific heat of water by using Joules calorimeter.Using these data calculate the specific heat of water.

Mass of empty calorimeter + stirrer = 0.0575 kg

Mass of empty calorimeter + stirrer + water = 0.130 kg

Initial temperature = 28 C

Voltmeter reading = 2v

Ammeter reading = 1.5 A

Final temperature = 34 C

Time for which current is passed =10 min.

Specific heat of the material of the calorimeter = 385 J kg 1 K1


15/21


PART D

IX. Answer any one of the following questions : 1 x 10 = 10

39. a) A quartz plate cut with its faces perpendicular to its optic axis is found to annul the rotationproduced by 0.2 m length of sugar solution of concentration 250 kg m3. If the specific rotation ofquartz plate is 380 rad.m1and the specific rotation of sugar solution is 0.0116 rad m2 kg1, find thethickness of the quartz plate. 4

b) What is a capacitor? give the principle of parallel plate capacitor. 4

c) Define resolving power of an optical instrument. How can resolving power of a telescope beincreased? 2

40. a) When a straight conductor of length 0.2 m carrying current of 1.2 A is placed n a magnetic field ofstrength 0.3 T. it experiences a force of 3.6 x 102 N. Calculate the inclination of the conductor withthe field. Find the force. if the conductor is at right angles to the magnetic field. 4

b) What are matter waves? Obtain the expression for de Broglie wavelength. 4

c) Write the value of power factor for 2

i) a pure resistor ii) a pure inductor.

***********************



PART A

I Answer all the following questions : 10 x 1 = 10

1. Define angular dispersion between two colours for a prism.2. How does intensity of light vary with amplitude of the wave ?

3. What is plane of polarisition?4. How many reflecting faces does the mirror possess in Michelsons rotating mirror experiment ?5. State Gausss theorem.6. Does the balancing condition of Wheatstone bridge vary, if the positions of the galvanometer and

battery are interchanged ?7. What are magnetic elements ?8. Give an example for boson.9. What is an n-type semiconductor ?10. Give the truth table for OR gate.

PART B

II Answer any ten of the following questions : 10 x 2 = 20

11. Write an expression for the deviation produced by a thin prism and explain the terms.12. How does the resolving power of a microscope vary with the

a) immersion of microscope in oilb) decrease of wavelength of the light used ?

13. Draw a neat diagram of the experimental set-up for the Fraunhoffer diffraction through a single slit.14. State and explain Brewsters law.15. Write any two properties of electric lines of force.16. Define relative permittivity of a medium in terms of the force between two point charges and give the

relation between relative and absolute permittivities.17. Calculate the electric current when 5 x 1018 number of electrons flow through a conducting wire in 3

second.18. State Kirchhoffs laws of electricity.19. What are coercivity and retentivity?


16/21


20. Explain why the sky appears red during sunrise and sunset.21. What is Band emission spectrum ? Mention any one source of it.22. What are de Broglie matter waves ? Write de Broglie wave equation for photon.

PART C

III Answer any one of the following questions : 1 x 5 = 5

23. Obtain an expression for the lateral shift produced by a parallel sided glass slab placed in air.

24. Derive an expression for the fringe width in Interference pattern.IV Answer any two of the following questions : 2 x 5 = 1025. When two current carrying conductors are placed parallel to each other, obtain an expression for the

force between them and hence define ampere.

26. In an alternate current circuit with only inductor, show that the voltage leads current by a phase2

with

a suitable derivation.27. What is rectification ? Explain how diode can be used as a full-wave rectifier.V Answer any two of the following questions : 2 x 5 = 10

28. Obtain an expression for the radius of Bohrs orbit.29. Write any five characteristics of nuclear forces.30. State and explain Soddys group displacement laws.VI Answer any three of the following questions : 3 x 5 = 15

31. A convex lens of focal length 0.2 m of refractive index 1.5 is immersed in water of refractive index33. Calculate the focal length of the lens in water.

32. The equivalent capacitance of two capacitors is 1.87F when connected in series and 8 F whenconnected in parallel. Find their individual capacitances.

33. Two tangent galvanometers with number of turns 2 and 10 having radii as 0.07 m and 0.08 mrespectively are connected in series. The deflection in the first T.G. is 600. Calculate the deflection inthe second T.G.

34. Calculate the velocity of photoelectron emitted when light of frequency 3 x 1012 Hz is incident on a

metal surface of threshold frequency 2 x 1012 Hz. Given h = 6.625 x 10 -34 Js andme = 9.1 x 10

-31 kg.VII Answer any one of the following questions : 1 x 5 = 5

35. Describe an experiment to determine the specific heat of water using Joules calorimeter.36. Describe an experiment to determine the reduction factor of Tangent Galvanometer and hence to

calculate BH at a given place.VIII Answer any one of the following questions : 1 x 5 = 5

37. Calculate the refractive index of the material of the lens using the given data :

Trial No. Distance between

The object and theScreen D (m)

Shift in the

Position of theLens S (m)

1 0.85 0.35

2 0.90 0.40

R1 = 0.18m and R2 = 0.185 m

38. Determine the temperature co-efficient of resistance of the given thermistor using the data below :

S = 100

Trial No. Temperaturet [ C] Balancing length l (m)

1 65 0.27

2 60 0.37


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PART D

IX Answer any one of the following : 1 x 10 = 10

39. a) If the critical angle of the given medium is 42 and a ray incident on it has maximum degree ofpolarization after reflection, calculate the angle of incidence. 4b) Obtain an expression for the electric potential at a point in an electric field due to anisolated charge. 4

c) Write any two application on of liquid crystals 240. a) Find the effective resistance between the points A and B 4

A

1

1111

1B

b) Explain the construction of a Ruby Laser with a labelled diagram. 4

c) Mention any two sources of power loss in a Transformer. 2

***********************



PART - AI. Answer all the questions : 10 X 1 = 101. Give the expression for deviation produced by a thin prism.2. What are the coherent sources?3. Name the ray that does not obey Snells law of refraction.4. Write the equation used by Michelson to calculate the speed of light.5. How does the capacitance of parallel plate capacitor vary with separation between plates of it?6. Define resistivity of a conductor.7. What is the value of resistance of an ideal Voltmeter?

8. The packing fraction of nucleus of an element is negative. What does it indicate?9. According to Pauli, which particle is emitted in -decay to account for violations of conservation laws?10. Give the truth table for AND gate.

PART - BII. Answer any ten questions : 10 X 2 = 2011. Draw a labeled diagram of the experimental set-up used to obtain pure spectrum.12. Mention any two theories about nature of light.13. Give any two differences between Fresnel and Fraunhofer diffraction.14. Write expression for force between two point charges separated by a distance in free space and

define S.I. unit of charge.15. Calculate the force acting on a point charge +4 nC placed in an electric field of intensity

7 x 105 NC1

16. When does the force acting on a moving charge in an external magnetic field becomes maximum andminimum?17. State Faradays laws of Electromagnetic induction.18. Show the variation of electric current with frequency in a resonant LCR series circuit diagrammatically.


18/21


19. What is the line emission spectrum? Give one of its sources.20. Obtain an expression for de Broglie wavelength of a photon.21. The sky appears blue. Explain why.22. What are liquid crystals? Give one of its applications.

PART - CIII. Answer any one of the following questions : 1 X 5 = 523. Derive Lens Makers formula for convex lens placed in an optical medium.

24. State Brewsters law. Show that the reflected and refracted rays are normal to each other at polarizingangle of incidence.

IV. Answer any two of the following questions : 2 X 5 = 1025. Give the theory of Tangent galvanometer and hence define reduction factor.26. Derive an expression for impedance and current in LCR series circuit using phasor diagram.27. Discuss the spectral series of hydrogen atom.

V. Answer any two of the following questions : 2 X 5 = 1028. Explain any five characteristics of atomic nucleus.

29. State decay law. Show that t0

N N e

for a radioactive element.

30. Distinguish between p-type and N-type semiconductors.

IV. Answer any three of the following questions : 3 X 5 = 1531. Find the real position of an air bubble in a glass cube of side 0.3 m if the bubble appears to be at a

distance of 0.05 m from one face and at 0.15 m from the opposite face.32. Calculate the effective capacitance between the points A and B shown in figure :

A

9 f 3 f

6 f

4 f12 f

2 f

B

33. The current flowing through a conductor having electron density 26 36 10 m is 5 A. Calculate the

time taken by an electron to drift from one end to other end of 10 m length of it.Area of cross-section of the wire = 2 x 106 m.Charge of electron = 1.6 x 1019 C.

34. A photon of frequency 1.5 x 1015 Hz is incident on a metal surface of work function 1.672 eV.Calculate the stopping potential.H = 6.625 x 1034 Js

VII. Answer any one of the following questions : 1 X 5 = 535. Describe an experiment to determine refractive index of material of give convex lens by finding its

focal length by shift method (given the radii of curvatures as R 1 and R2).36. Describe an experiment to draw forward bias characteristic of a semi-conductor diode and to obtain

forward resistance of the diode from it.VIII. Answer any one of the following questions : 1 X 5 = 537. Determine the resistivity of the material of the given wire using the following data :

Length of the wire = 0.26 mDiameter of the wire = 0.63 x 103 m

Trial No. Resistance in the right gap ( ) Balancing length (m)

1 1 0.42

2 2 0.29


19/21


38. Calculate the internal resistance of a cell using the given data :Balancing length for cell in open circuit = 0.64 m (when R = 0)

Trial No. Resistance in the right gap ( ) Balancing length (m)

1 4 0.46

2 6 0.50

3 8 0.52

4 10 0.53

PART - DAnswer any one questions : 1 X 10 = 10

39. a) Light of wavelengtho

6000 A is used to obtain interference fringe of width 6 mm in a Youngsdouble slit experiment. Calculate the wavelength of light required to obtain fringe of width 4 mm if

the distance between the screen and slits is reduced to half of its initial value. 4b) Derive an expression for electric intensity near the surface of a charged spherical conductor usingGauss theorem. 4

c) Write an expression for resolving power of a Microscope and explain the terms. 240. a) Find the current I2 in the circuit shown below : 4

2V, 1

4V, 22I

2I

3

b) Give any four application of lasers. 4

c) Write an expression for force acting on a current carrying conductor placed in an external magneticfield and explain the terms. 2

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20/21


SECOND PUC ANNUAL EXAMINATION JULY2010PHYSICS


PART - AI. Answer all the following questions : 10 x 1 = 10

1. When a ray of white light passes through a prism which colour is most deviated ?2. Write the condition for constructive interference in terms of phase difference between two interfering

waves of light.3. Name the phenomenon which illustrates the transverse nature of light.4. Give the expression for the speed of light in terms of its frequency and wavelength.5. Two point charges q 1 and q 2 are such that q 1,q 2> 0. What is the nature of the force between

the charges ?6. Define emf of a cell.7. Which law of Kirchhoff related to frequency signifies conservation of energy ?8. What are quarks ?9. Mention any one application of LED.

10. Write the Boolean equation for OR logic gate.

PART - BII . Answer any ten of the following questions : 10 x 2 = 2011. Draw a neat diagram to show refraction of a ray of monochromatic light passing through a prism in the

position of minimum deviation.12. Who proposed quantum theory of radiation? Give the expression for energy associated with a photon.13. Calculate the fringe width of the interference pattern from the following data :

Wavelength of the light A, = 678 nmDistance between the slits d = 0.35 mmDistance between the slits and the screen D = 1 in,

14. State and explain Gauss theorem in electrostatics.15. With a neat diagram of a cylindrical capacitor, write an expression for its capacitance.16. Draw a circuit diagram of Wheatstone's network. Give the condition for balance of a Wheatstone's

network.17. Define the terms 'magnetic clip' and 'horizontal component of earth's magnetic field'.18. State Faraday's laws of electromagnetic induction.19. What are Fraunhoffer lines ? What is the type of spectrum of sunlight observed during total solar

eclipse ?20. What are coherent scattering and incoherent scattering ?21. Give any two properties of LASER.22. Mention two types of liquid crystals.

PART - CIll. Answer any one of the following questions : 1 x 5 = 523. Derive the relation connecting u. u, n and R for refraction at a spherical surface concave towards

a point object in denser medium, where the symbols have their usual meaning.

24. Explain double refraction with a neat diagram. Distinguish between the ordinary ray and theextraordinary ray with specific reference to (1) the speed of light and 01) the plane of polarisation.

25. What is meant by equivalent resistance ? Obtain an expression for the effective resistance o, threeresistors connected in series.

26. Obtain an expression for the current in a series LCR circuit, with the appropriate phase diagram.27. Give Einstein's explanation of photoelectric effect.V. Answer any two of the following questions : 2 x 5 = 1028. State the postulates of Bohr's theory of hydrogen atom.29. a) Define the following terms :

i) Decay constantii) Half-life of a radioactive element.

b) Assuming N = Noe x'obtain an expression for half-life period of a radioactive element in

terms of its decay constant.30. Distinguish between conductors, semiconductors and insulators on

the basis of Band theory of solids.


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31. A parallel sided glass slab of thickness 0.25 m having refractive index of 1.524 is completely

immersed in water of refractive index 1.333. A ray of light is incident on it at an angle of 40. Calculatethe lateral shift produced.

32. A point charge of 20 pC is situated at a point 0. A and B are points 0.05 m and 0.15 m away from thischarge. Find the potential at A and B. Also find the work done to move a point charge of 1.6 x 10-19 Cfrom B to A.

33. A galvanometer of resistance 50.52 requires a current of 2 mA for full scale deflection. How do youconvert it into

a) an ammeter of range 0 - 3A andb) a voltmeter of range 0 - 5V ?34. Calculate the energy released in kilowatt-hour (kWh) when 0.2 kg of 92U235 undergoes fission

completely. Assume that the average energy released per fission of 92U235 nucleus is 200 MeV.VII. Answer any one of the following questions : 1 x 5 = 535. Describe an experiment to determine the refractive index of the material of a convex lens by finding its

focal length by shift method and radius of curvature by Boy's method.36: Describe an experiment to determine the specific heat of a liquid using Joule's calorimeter.37. Verify the laws of combination of resistances using Ohm's law, from the following observations

recorded in an experiment :Given : R = 2C2 and R2 = 40.

Resistances in series :

Resistances in parallel :

38. Calculate the reduction factor of the TG and find the value of at the place from the following data :Radius of the coil r = 7.96 x 10-2 mNo. of turns used in the coil n = 2.

PART - DIX. Answer any one of the following questions : 1 x 10 = 10

39. a) In an experiment with a microscope, light of wavelength 4240A is used. The limit ofresolution is found to be 3 x 10 -7 m. What is the semivertical angle ? 4

b) What are matter waves ? Give the expression for de Broglie wavelength in terms of linearmomentum of the particle. Give the principle of electron microscope. 4

c) Name the devices working on the principle of self-induction and mutual induction.

40. a) In an atom, an electron encircles in a path of radius 5.1 x 10 -11 m producing a magnetic field of13.4 tesla at the centre of the orbit. Given the charge of electron to be 1.6 x 10 -19C, calculate thefrequency of the electron in its orbit. 4b) Derive the expression for energy stored in a charged capacitor. 4c) Mention the conditions for sustained interference pattern. 2

***********************

Trial No. Voltmeter readingVin volts

Ammeter readingI in ampere

1 2 0.332 2.5 0.41

Trial No. Voltmeter readingVin volts

Ammeter readingI in ampere

1 2 1.52 2.5 1.87

Trial No. Ammeter readingI in amp

Deflection in TG

1 2 3 41

2

1.5

2

34

45

35

44

36

45

35

46

Documents

2nd PUC Question Papers Physics 2006-2010