2023 Physics New Pattern

BALLARYy
DISTRICTLEVEL II PUC PREPARATORY EXAM, JANUARY-2023
Time:3Hrs. 15 Mins.
General instructions:
1. Al prts s have to be answered in
the first wo
P
2
Pan heconsidered for awarding manks.
Sub: PHYSIcs(33)
Max. Marks:70
er will be consideredfor he nir wo peges of the answer
booklet. For Part -
A questions,
first writtenn
3 Answers without relevant dagram / figure / dircult wherever necessary
marks.
4. Direct answers to the numencalproblems without detaled soUionD n
PART A
.Pick the corect option among the four glven optlons for ALL of the following questons
15*1- 15
1.
Theinstrument
which is
usedto detect the presence of charge on a
o
(B) Telescope
(A) Microscope
(D) Electroscope
(C) Gyroscope
2. Elecinc potental at a point due toa point charge depends on the distance rom
(8) distance
Adutance
(C) (distance)"
(D) vdistance
3. An example for non-polar molecule is
(A) Oxygen (O2) molecule
(C) Carbon monoxide (CO) molecule
Hydrochloric acid (HCI)
molecule
(D)Water (H:0) molecule
4.
Kirchhofrs junctionrule is an illustration of
A) Conservaton of inear momentum
(C) Conservaton of energy
(B) Conservation of charge
(D) Conservaton of angular
momentum
5.
The conditon for velocity of a charge partide moving In a crossed electric fleld and magnetic fheld
without defecton is:
A) = EB (B)
'
(C)v =
(6B)" ()-
6. The magnetic held lines inside a bar megnet
(A) Converge at
north pole and
diverge from south pole
(8) Are from its north pole to south pole
() Are from its south pole to north pole
(D) Do not exist
7.
The phenomenon in which an emf Induced in a col due to change in cumrent through same col is
(A) Mutual inducton (8) Self induction (C) Conduction (D) Friction
8. AC generator converts:
(A) Mechanical ener9y into electrical energy8Mechenical energyintoght energy
(C) Elecrical energy into mechanical energy (D) Mechanical energy into chemical energY
9. In the case of altermating voltage applied to a seres LCR circuit, at resonance
(A)K R
10.The curent which appears in the reglon In
whlch
electric flux is changing is called:
(A) Conducion cument
(C) Eddy curent
(B)Xc R (C)A Xc
(B) Displacement cument
(D) Surface Current
11.The phenomenon responsible for blue colour of the sky is
(A) Reflection of light
(C) Scattenng or gnt
(8) Interference of light
(D) Polarization of light
12.Which of the following is not
an application of polaroids:
(A) To produce and analyse plane polarized Iioht (B) To see 3-D plctures
(C) To improve colour conrast in old ol painungs (D)To produce diffracton pattem
P.T.O.
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13.
The wavelength associated with material parices in motion are
calea
(A) Matter waves
6) Seismic waves (C) Radio waves (D) Microwaves
14.Among the foliowing. which set of nuclei are isobars?
(A)H and He (8)Cand C (C)Uand "U (D) ,H and iH
15.
For a NAND gate, which set of inputs Aand B
give a low output o)A= 1, B= 1
(A)A 0, B 0
(5)A 0,5=1 (C)A=1,8=0
1.
5x1-
uestionenS Ehoosing appropriete answers given in the bracket for ALL the follown
questionss:
(auss 's law, Photodiode, Wavelength, Nuclear fusion, coulomo)
16. The Si unit of electric charge is ,
in magnetism.
. Isolated magnetic poles do not exist. This statement is consequeno8 O-
18. For good dífraction, the size of the obstacie must be is of the order of of the ngt
9 is the phenomenon by which energy is produced in a star.
1s an example ofoptoelectronic device.
PART B
20
5x 2 =10
I. Answer any FVE of the following questions:
21. What
is an equipotental surface? Give an example.
22. State and explain Ampere's circuital law.
23. Write any two properties of diamagnetic materials.
24. What are Eddy aurrents? Mention one of its practical uses
s. List any wo sources of energy loss in a transformer.
26. Mention any two uses of ultraviolet rays.
27. Give any two methods to produce plane polarized light.
28. Draw a schematic diagram of Geiger Marsden experiment for studying a-partide scattering by
a thin gold foil.
29. Write any two characteristics of nucdear force.
PART O
V. Answer any
FVE of the following questions: 5x 3 15
30. Mention three basic properties of electic charges.
31. Deduce the relation between conductivity, current density and electric feld.
32. Explain with the circuit diagram how to convert galvanometer into
ammeter
33. Derive an
expression for lorque experienced by a magne
magnebc field. dipole when placed in an external
34. Explain brieftly the coil and magnet experiment to demonstrate elecromagnetic inducion.
35. Show that the focal length of a concave mirror is half of its radius of curvature
36. Arive at the expression for radius of n orbit of electron in a
hydrogen atom
37. The half life of Radon-222 is 3.825 days. Find its decay constant.
38. Write three differences between p-type and n-type semiconductor.
P.T.O
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PART D
3x5=15
v. Answer any THREE of the following questions:
39. Derive an expression for electric feld at a point on the axial line of an electric dipole.
40.Obtain anexpression for equivalent emf and equivalent internal resistance, when two different
cells are connected in series.
41. Using BiOSavarts law, derive an expression for magnetc neld &atapoint on the axis of a
circular current loop.
42. Derive lens
makers formula for convex lens.
y n r e e experimental observations of photoelectric effect.
O e e Einstein's photoelectric equation and explain he terme.
44.(0What is rectification?
wrte the labelled arcuit diagram and input- output waveforms of a half wave rectifier.[2M
43.
[1M
2M
(i) Explain the working of a half wave rectifer.
VI. Answor any 1WQ of the following questions;
2x 5 10
45. In a parallel plate capacitor with air between the plates, each plate has an area of 8x10 m
and distance between the plates is 2mm. calculate the capacitance and energy stored, when it is
charged by connecting the battery of 200V. Gven: 6, = 8.854x 10"F/m.
46. A wire of length 2.0 m, radius 0.5mm and resistivity 1.963x10 Mm is connected in series
with a battery of emt 5V and internal resistance 10. Calculate the resistance of the wire and
Current in the dircuit.
47. A bulb of resistance 62 and an inductor are connected to an ac source of 220V 50Hz. Find the
value of inductance of an inductor that must be connected with the lamp in order to maintain the
Current of 20A.
48. In Young's double slit experiment wavelength of light used is 5000A and the distance between
theslits is,2mm.distance ofscreen from slit is 1m. Find fringe width and also calculate the
distance of 7" dark tringe from central bright fringe.
9000000
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GOVERNMENT OF KARNATAKA
Deputy Director of pre-university education Karwar
SECOND PUC PREPARATOTY EXAMINATION 2023
TIME : 3 hr 15 min. SUBJECT : PHYSICS (33) Max Marks : 70
General instructions:
1. All parts are compulsory.
2. Part – A questions have to be answered in the first two pages of the answer-booklet. For Part – A questions, first
written-answer will be considered for awarding marks.
3. Answers without relevant diagram / figure / circuit wherever necessary will not carry any marks.
4. Direct answers to the numerical problems without detailed solutions will not carry any marks.
PART – A
I. Pick the correct option among the four given options for ALL of the following questions: 15 × 1 = 15
1. According to Coulomb’s law, the electrostatic force of attraction or repulsion between two point
charges depends on the distance between them as:
(A)
1
(𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒)2
(B)
1
(𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒)3
(C) (𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒)3
(D) (𝑑𝑖𝑠𝑡𝑎𝑛𝑐𝑒)2
2. In a conductor, the variation of electrostatic potential from centre to its surface is
(A) increases (B) decreases (C) remains constant (D) zero
3. Capacitance of a parallel plate capacitor depends on:
(A) Distance between the plates (B) Area of the plates
(C) permittivity of the medium (D) all the above
4. The resistance of a carbon resistor is 220 Ω with a tolerance value of 10%. The colour of the third band
of the resistor is:
(A) Black (B) Brown (C) Red (D) Silver
5. A charged particle moving in a magnetic field region describes helical path, when the angle between
the velocity of the charge and the magnetic field is:
(A) 0° (B) 90° (C) Between 0° & 90° (D) None of these
6. Identify the wrong statement among the following options about magnetism :
(A) Earth behaves as a huge magnet.
(B) When a bar magnet is freely suspended, it points in the north-south direction.
(C) Like poles repel and unlike poles attract each other.
(D) We can isolate the north and south pole of a magnet.
7. S.I unit of magnetic flux is :
(A) Tesla (T) (B) Weber (Wb)
(C) Newton/Coulomb (N/C) (D) Volt/metre (V/m)
8. In AC generator induced emf is maximum when:
(A) Plane of the armature is parallel to the magnetic field
(B) Plane of the armature is perpendicular to the magnetic field
(C) Plane of the armature is either parallel or perpendicular to the magnetic field
(D) Plane of the armature is neither parallel nor perpendicular to the magnetic field
9. In the case of alternating voltage applied to an inductor:
(A) the current leads the voltage by a phase angle of π/2
(B) the current lags behind the voltage by a phase angle of π/2
(C) the current and the voltage are in phase
(D) the current leads the voltage by a phase angle of π/4
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10. The electromagnetic waves used to kill germs in water purifiers are:
(A) Microwaves (B) Infrared waves
(C) Visible rays (D) Ultraviolet rays
11. At the critical angle of incidence in the denser medium:
(A) Light ray refracts to the rarer medium.
(B) Light ray reflects to the denser medium.
(C) Light ray graces the refracting surface.
(D) Angle of refraction is 0°.
12. The phenomena of bending of light at the corners of an obstacle is called:
(A) refraction (B) polarization (C)interference (D) diffraction
13. The minimum energy required to remove an electron from the metal surface is called:
(A) Threshold frequency (B) Work function
(C) Stopping potential (D) Threshold wavelength
14. The material used to slow down the fast moving neutrons in a nuclear reactor is
(A) Core (B) Reflector (C) Moderator (D) Control rods
15. For an OR gate, which set of inputs A and B give a low output Y = 0?
(A) A = 0, B = 0 (B) A = 0, B = 1 (C) A = 1, B = 0 (D) A = 1, B = 1
II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following
questions: 5 × 1 = 5
(Declination, Mass number, Valence band, Diameter, Dipole moment)
16. The product of either of a charge and the distance of separation between the charges is called
_______________.
17. The angle between the true geographic north and the north shown by a compass needle is called
______________________.
18. Resolving power of a telescope can be increased by increasing the _____________ of the objective
lens used.
19. Volume of a nucleus is directly proportional to its ___________________ .
20. Energy band which is completely filled at 0 K is _____________________ .
PART – B
III. Answer any FIVE of the following questions: 5 × 2 = 10
21. Arrive at the expression for potential energy for a system of two charges in the absence of external
field.
22. State Ampere’s circuital law. Write its mathematical form.
23. Draw the magnetic hysteresis loop for a ferromagnetic material.
24. State Lenz’s law. What is the significance of it.
25. List any two sources of energy loss in a transformer.
26. What is displacement current? Mention its expression.
27. Show that at the polarising angle of incidence the tangent of the polarising angle is equal to the
refractive index of the medium.
28. Draw the energy level diagram of hydrogen atom.
29. What is nuclear fission process? Give an example.
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PART – C
IV. Answer any FIVE of the following questions: 5 × 3 = 15
30. Mention any three properties of electric field lines.
31. Derive 𝑗
⃗ = 𝜎 𝐸
⃗⃗ by using Ohm’s law where the terms have usual meanings.
32. With a circuit diagram, explain how a galvanometer can be converted into a ammeter.
33. Write any three properties of ferro magnetic materials.
34. Mention any three applications of eddy currents.
35. Show that the focal length is half of the radius of curvature for a concave mirror forming real image.
36. Arrive at the expression for the velocity of an electron in the nth orbit of hydrogen atom.
37. The half life of uranium - 238 undergoing α -decay is 4.5 x 109 years. Calculate the activity of 1 mole
sample of uranium -238.
38. Explain the working of Zener diode as voltage regulator.
PART – D
V. Answer any THEEE of the following questions: 3 × 5 = 15
39. Derive the expression for the electric field due to an electric dipole along the axial point.
40. Two cells of emf ε1 and ε2 and internal resistance r1 and r2 are connected in parallel such that they
send current in the same direction. Derive an expression for equivalent emf and equivalent resistance
of the combination.
41. Obtain the expression for the magnetic field due to a current loop at any point along the axis using
Biot-Savart’s law.
42. Arrive at the expression for refractive index of the material of the prism in terms of angle of minimum
deviation and angle of the prism.
43. (i) Define work function. (1)
(ii) Write any two experimental observations of photoelectric effect. (2)
(iii) what are matter waves? Mention the expression for the de-Broglie wavelength of an electron in
terms of its mass and velocity. (2)
44. (i) What is rectification? (1)
(ii) Write the circuit diagram and input – output waveforms for a half wave rectifier. (2)
(iii) Explain the working of a half wave rectifier. (2)
VI. Answer any TWO of the following questions: 2 × 5 = 10
45. In a parallel plate capacitor, the area of each plate is 6 x 10-3 m2 and the distance between the plates
is 3 mm. Calculate the capacitance of the capacitor. If this capacitor is connected to 100 V supply, what
is the charge on each plate of the capacitor? Given 𝜀0 = 8.854 x 10-12 Fm-1
46. a) Three resistors 3 Ω, 4 Ω and 12 Ω are connected in parallel. What is the effective resistance of the
combination?
b) If the combination is connected to a battery of emf 6 V and internal resistance 0.5 Ω, find the
current drawn from the battery and terminal potential difference across the battery?
47. Calculate the resonant frequency in LCR circuit with inductance 2.0 H, capacitance 32 µF and
resistance of 10 Ω. What is the Q value of this circuit?
48. In Young’s double slit experiment the two slits are 0.3 mm apart and are illuminated by a light of
wavelength of 650 nm. Calculate the distance of the (i) 3rd dark and (ii) 5th bright fringes from the
midpoint in the interference pattern obtained on a screen 1.2 m away from the slits.
**********************
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| ^t I
s
DISTRICT LEVEL 1I PUC PREPARATORY EXAM, JANUARY - 2023
Time:3 Hrs. 15 Mins. Sub: PHYSICS (33) Max. Marks:70
Gen6ral lnstructions:
1 All pads are compulsory.
2 Part - A questions have to be ansl /ered in the first two pages of the answer booklet. For Pad - A questions, first written
answerwillbe considered for awarding ma*s.
3 Answ€rs withoul relevant diagram /ligure/ circult whorover necessaryNill not carry any ma*s,
PART - A
L Pick the corrsct option among the four glv€n options for Alt of tho following questions:
'15x1=15
1. Electric flux through a closed surface enclosing a charge'q'is
(A) zerc (B)
? (C) coq (D).4
2. Which of the following is not a property of equipotential surface
(A).They do not cross each other
(B) Work done in moving a test charge ovei an equipotential surface is zero
(c) Rate of change of potenlial with distance is zero
(D) Direction of electric field is always normal to equipotential surface
3. Electrostalic potential at a point due to an isolated point charge depends on the distance 'r' as
(A): (B) (c) r (D):
4. Conductivity is the reciprocal of
(A) Resistanco (B) Resistivity (C) Mobility (D) Conduclance
5. A charged particle is moving perpendicular to the direclion of magnetic field. Th€ path traced by
the charged parlicle is
(A) Skaight path (B) Helical path (C) Circular path (D) None of these
6. Electromagnets are made of soft iron because it has
(A) Low susceptibility and high permeability (B) High susceplibility and low permeability
lC) High retentivity and low permeability (D) High permeability and low retentivity
7. According to Faraday's law, the magnitudo of induced ernf in a circuit is equal to
(A) Initial magnetic flux @) Rate of change of magnetic flux
(C) Change in magnetic flux (D) Final magnetic flux
8. Sl unil of inductance is
0 (A taad (B) ampere (C) henry (D) volt
9. In a series LCR circuit, if }i! is inductive reactance and Xc is capacitive reactance. At resonance,
(A))(r>Xc IB)Xr=Xc (C)Xr<Xc (D XL+X.
10.ldentiry the correcl sequence, for the following eleclromagnetic waves arranged in the ascending
order of their wavelengths
(A)Visible rays, X- rays, Micro waves, ), - rays (B) X-rays, Visible, / - rays, Microwaves
(C) Microwaves, l, - rays, X - rays, visible rays (D) /-rays, X-rays, Msible rays, Microwaves
11.The phenomenon of change in th€ direction of propagation of an obliquely incident ray of light
that enters the other medium is called
(A) Refraction (B) Reflection (C) Total intemal refleclion (D) Difftaction
12.Malus law is given by 1 = /0 cos'z A, in this relation b refer to
t (A) Intensity of incident light (B) Intensity of light emerged from polarizer (P1)
(C) Intensity of light ernerged from analyzer (P, (D).None of these
I
P.T.O.
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'13.Above threshold frequency, photoelectric current is I to
(A) Frequency oJ incident tight (B)
"n1
rignt
(u) stopprng potentiat (O) light
14.Ihe mass number of a nucleus is equal to
(A) Number of nucleons
(C) Number of protons
l . Which of the following is not an optoelectronic junction device
(A) Photodiode (B).Logic gate (C)Sotarce (D) Light emitting diode
ll. Fill in.the blanks choosing appropriate answers given in the bracket for Att the following
questions: 5x.l=5
(Coulomb, holes, conseried, sphe cal, Meissner)
(B) Number of neutrons
(D) Number of electrons
The total charge of an isolated system is arways
effect is the phenomenon of perfect diamagnetism in superconductors.
Wavefront due to a point source is
--.
Nuclear force is stronger than
--_ force,
In P - type extrinsic semiconductor are the majority charge cairiers.
PART - B
lll. Answer any FIVE of the following questions:
2l. What is electrostatic shielding? Mention one use of electrostatic shieldrno.
22 State and explain Ampere's circuital law. r; i J.,*!
23. Define magnetization of a magnelic material. civeitssl unit.
24. Draw a neat tabelled diagram of AC generator.
25. Give any two advantages of AC voltage over DC voltage.
26. What is displacement current? Write lhe expression for displacement current.
27. Why'Sun appears red'at sunrise and sunset. Explain.
28. Mention any two demerits of Bohr's atom model.
?.94 Write any two differences between nuclear fission and nuclear fusion.
PART - C
lV. Answer anyElyEof the following questions:
16.
17.
'18
't9.
20
5x2=10
5x3=15
30. State Coulomb's law. Write Coulomb's law in vector form and explain the terms.
31 Arrive at the expression for current in terms of dritt velocity.
32 Define the current sensitivity of a moving coir garvanometer. Name any two factors on which the
current sensitivity of moving coil galvanometer depends.
33. Write any three properties of paramagnetic materials.
34. Deduce an expression for rnotional emf in a conducting rod moving in uniform magnetic field.
35. lf 'f is focal length and 'R' is radius of curvature. Show that / = for a concave mrrror.
36. Sketch the energy level diagram for hydrogen atom and draw spectral series of hydrogen atom.
37. The hali life of lsAu is 2.7 days. Calculate the decay constant,
38. With a circuit diagram, exptain the working of Zener diode as voltage regutator.
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PART - D
V- Answer any ItsSE of the following questions: 3x5=15
39. Derive the expression for electric field at a point on the equatorial plane of an electric dipole'
- 40. Obtain an expression for equivalent emf and equivalent intemal resistance of twp cells of ernfs
. 6r , €2 and inlernal resislances 4, 12 respectiv€ly in parallel combination'
41. Derive the expression for magnetic field at a point on the axis of a circular current loop-
42. Arrive at an expression for refractive index of the material of the prism in terms of angle of the
prism and angle of minimum deviation.
43. (i)What are matter waves?
(ii Mention the expression for de-Broglie wavelength of electron in terms of accelerating
potential and explain the terms.
(ii) State Helsenberg's uncertainty principle. Give Born's probability interprelation of matter
waves.
44. (i) Define (a) Energy band and (b) Energy gap.
iii) crassiti bnouitbrs, semicoirciu riint insulators on the basis of band the6ry of solids
Vl. Answer any Iryq of the followlng questlons: 2 x 5 = 10
45. A parallel plate capacitor consists of plates each of area 2.5x10-1m2 and separated by smm
which is charged to l03Z [60 = 8.854 x l}t' C2 Ntm-')
Determine.
(a) Capacitance of the capacitor
(b) Charge on the plates
(c) Electric neld between the plates
(d) Energy stored in lhe capacitor.
46. The four arms of a Wheatstone's bridge have the following resistances, AB = 1000' BC = 10O'
CD = sf,) and DA = 60c), A galvanometer is @nnected across BD. Calculate th9 current through
the galvanometer when a potential difference of 1OV is maintained across AC. -
47. A coil of inductance 0,50H and resistance 100o is connected to a 240V, 50Hz Ac supply.
(a) What is the impedance of the circuit?
(b) What is the maximum current in the coil?
(c) What is the time lag between voltage maximum and current maximum?
48. In Young's double slit experiment two slits 0.18mm apart are illuminated by a light of wavelength
589.3nm. Calculate the distance of 5h bright fringe and 3d dark fringe from the midpoint of the
interference pattem obtained on a screen kept 0.6m away from the slits.
{fr{fifrrr+
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2023 Physics New Pattern