TN 12th Question Paper 2023 Physics

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 11
6617
£vÄ Gs
A Register Number

!6617Physics!
PART - III
C¯Ø¤¯À / PHYSICS

( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 70

Time Allowed : 3.00 Hours ] [ Maximum Marks : 70

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP¨ £vÁõQ EÒÍuõ GߣuøÚa
\›£õºzxU öPõÒÍÄ®. Aa_¨£vÂÀ SøÓ°¸¨¤ß, AøÓU
PsPõo¨£õÍ›h® EhÚi¯õPz öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.

Instructions : (1) Check the question paper for fairness of printing. If there is any lack of
fairness, inform the Hall Supervisor immediately.

(2) Use Blue or Black ink to write and underline and pencil to draw
diagrams.

£Sv & I / PART - I

SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15
(ii) öPõkUP¨£mkÒÍ ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯z
÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx GÊuÄ®.
Note : (i) Answer all the questions.

(ii) Choose the most appropriate answer from the given four alternatives
and write the option code and the corresponding answer.

[ v¸¨¦P / Turn over

6617 2

1. λe Aø»}Í® öPõsh G»Umµõß ©ØÖ® λp Aø»}Í® öPõsh L÷£õmhõß
BQ¯øÁ J÷µ BØÓø»¨ (E) ö£ØÖ C¸¨¤ß Aø»}Í[PÒ λ e ©ØÖ® λ p
Cøh°»õÚ öuõhº¦ :

1
(A) λp ∝ λe
(B) λp ∝ λe (C) λp ∝ λe2 (D) λp ∝ λ e

The wavelength λe of an electron and λp of a photon of same energy E are related
by :

1
(a) λp ∝ (b) λp ∝ λe (c) λp ∝ λe2 (d) λp ∝ λ e
λe

2. Cµsk ÷£õ»µõ´kPÎß £µÄ Aa_PÒ JßÖUöPõßÖ 308 ÷PõnzvÀ \õ´¢xÒÍ
{ø»°À, I ö\ÔÄ öPõsh uÍÂøÍÄ AØÓ JÎ •uÀ ÷£õ»µõ´iß «x
ÂÊQßÓx. CµshõÁx ÷£õ»µõ´iÀ C¸¢x öÁÎ÷¯Ö® J롧 ö\ÔÄ :

1 1 3 3
(A) I (B) I (C) I (D) I
8 4 8 4

Two polaroids are kept with their transmission axes inclined at 308. Unpolarised
light of intensity I falls on the first polaroid. Intensity of light emerging from the
second polaroid :

1 1 3 3
(a) I (b) I (c) I (d) I
8 4 8 4

3. ªßPõ¢u Aø» JßÔß Põ¢u¨¦»zvß Gs ©v¨¦ 3×10−6 T GÛÀ, Auß
ªß¦»zvß ©v¨¦ GßÚ ?

(A) 600 Vm−1 (B) 100 Vm−1 (C) 900 Vm−1 (D) 300 Vm−1

If the magnitude of the magnetic field is 3×10−6 T, then the magnitude of the
electric field for a electromagnetic wave is :

(a) 600 Vm−1 (b) 100 Vm−1 (c) 900 Vm−1 (d) 300 Vm−1

A

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4. ¤ßÁ¸® ªß_ØÔÀ EÒÍ ªß÷Úõmh® 1.0 A GÛÀ ªßuøh P &°ß ©v¨¦
GßÚ ?

(A) 3.5 Ω (B) 1.5 Ω (C) 4.5 Ω (D) 2.5 Ω
There is a current of 1.0 A in the circuit shown below. What is the resistance of
P?

(a) 3.5 Ω (b) 1.5 Ω (c) 4.5 Ω (d) 2.5 Ω

5. J¸ Põº£ß ªßuøh¯õUQ°ß ªßuøh ©v¨¦ (47±4.7) kΩ GÛÀ AvÀ Ch®
ö£Ö® {ÓÁøͯ[PÎß Á›ø\ :
(A) Fuõ & ©g\Ò & Bµg_ & öÁÒÎ
(B) ©g\Ò & £aø\ & Fuõ & u[P®
(C) £aø\ & Bµg_ & Fuõ & u[P®
(D) ©g\Ò & Fuõ & Bµg_ & öÁÒÎ
A carbon resistor of (47±4.7) kΩ is to be marked with rings of different colours for
its identification. The colour code sequence will be :
(a) Violet - Yellow - Orange - Silver
(b) Yellow - Green - Violet - Gold

(c) Green - Orange - Violet - Gold
(d) Yellow - Violet - Orange - Silver

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6617 4

6. øímµáß AqÂÀ CµshõÁx _ØÖ¨£õøu°À C¯[S® G»UmµõÛß ÷Põn
E¢u® :
4h 2h h
(A) (B) h (C) (D)
π π π
In an hydrogen atom, the electron revolving in the second orbit, has angular
momentum :

4h 2h h
(a) (b) h (c) (d)
π π π

7. ¯[ Cµmøh¨ ¤ÍÄ B´ÂÀ, ¤ÍÄPÐUS Cøh÷¯ EÒÍ öuõø»Ä
C¸©h[PõUP¨£kQÓx. vøµ°À ÷uõßÖ® £møh AP»® ©õÓõ©À C¸UP
÷Áskö©ÛÀ, ¤ÍÄPÐUS® vøµUS® Cøh÷¯ EÒÍ öuõø»Ä (D) GÆÁÍÄ
C¸UP ÷Ásk® ?
D D
(A) 2D (B) 2D (C) 2
(D)
2

In Young’s double-slit experiment, the slit separation is doubled. To maintain the
same fringe spacing on the screen, the screen-to-slit distance D must be changed
to :

D D
(a) 2D (b) 2D (c) (d)
2 2

8. Cønzumk ªß÷uUQ JßÖ V ªßÚÊzu ÷ÁÖ£õmiÀ Q AÍÄ ªßÞmh®
öPõsh ªßxPÒPøÍ ÷\ªUQßÓx. umkPÎß £µ¨£ÍÄ® umkPÐUS
Cøh÷¯¯õÚ öuõø»Ä® C¸©h[PõÚõÀ ¤ßÁ¸ÁÚÁØÖÒ G¢u AÍÄ
©õÖ£k® ?
(A) ªßÚÊzu ÷ÁÖ£õk (B) ªß÷uUSzvÓß
(C) BØÓÀ Ahºzv (D) ªßxPÒ
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the
parallel plate capacitor and distance between the plates are each doubled then
which is the quantity that will change ?

(a) Voltage (b) Capacitance
(c) Energy density (d) Charge

A

5 6617

→ ∧
9. v =v iGßÓ vø\÷ÁPzxhß ªßPõ¢u Aø» J¸ FhPzvÀ £µÄQßÓx.
CÆÁø»°ß ©õÖvø\ ªß¦»® +Y Aa]ß vø\°À C¸¢uõÀ Auß ©õÖvø\
Põ¢u¨¦»® __________ C¸US®.
(A) +Z vø\°À (B) −Y vø\°À (C) −Z vø\°À (D) −X vø\°À
→ ∧
An electromagnetic wave is propagating in a medium with velocity v = v i . The
instantaneous oscillating electric field of this electromagnetic wave is along
+Y axis, then the direction of oscillating magnetic field of the electromagnetic
wave will be along :
(a) +Z direction (b) −Y direction (c) −Z direction (d) −X direction

10. PõØÔ¼¸¢x JλPÀ Gs 2 öPõsh Psnõi¨ £mhPzvß «x JÎ
ÂÊQÓx GÛÀ, \õzv¯©õÚ ö£¸© »S ÷Põnzvß ©v¨¦ :
(A) 608 (B) 308 (C) 908 (D) 458
For light incident from air on a slab of refractive index 2, the maximum possible
angle of refraction is :
(a) 608 (b) 308 (c) 908 (d) 458

11. ö\Úõº øh÷¯õiß •ußø© £¯ß£õk :
(A) Aø» C¯ØÔ (B) Aø» v¸zv
(C) ªßÚÊzua ^µø©¨£õß (D) ö£¸UQ
The Zener diode is primarily used as :
(a) Oscillator (b) Rectifier
(c) Voltage regulator (d) Amplifier

12. t GßÓ PnzvÀ, J¸ _¸÷Íõk öuõhº¦øh¯ £õ¯® ΦB=15t2−50t+250 GÚ
EÒÍx. t=3 s &CÀ ysh¨£mh ªßÛ¯US Âø\¯õÚx :
(A) −40 V (B) −190 V (C) 40 V (D) −10 V
The flux linked with a coil at any instant t is given by ΦB=15t2−50t+250. The
induced emf at t=3 s is :

(a) −40 V (b) −190 V (c) 40 V (d) −10 V

A [ v¸¨¦P / Turn over

6617 6

13. h¯õ Põ¢u¨ö£õ¸ÐUS GkzxUPõmk :
(A) {UPÀ (B) uspº (C) A¾ªÛ¯® (D) C¸®¦
An example of Diamagnetic material is _________.
(a) Nickel (b) Water (c) Aluminium (d) Iron

14. AøÓ öÁ¨£{ø»°À ]¼PõÛß Â»UP¨£mh BØÓÀ CøhöÁ롧 ©v¨¦
GßÚ ?
(A) 0.3 eV (B) 0.7 eV (C) 0.9 eV (D) 1.1 eV
What is value of Forbidden Energy gap for silicon at room temperature ?
(a) 0.3 eV (b) 0.7 eV (c) 0.9 eV (d) 1.1 eV

15. ÷µõ÷£õUPÎÀ uø\U P®¤PÒ E¸ÁõUP¨ £¯ß£k® E÷»õPU P»øÁPÒ :
(A) u[P® öÁÒÎ E÷»õPU P»øÁPÒ
(B) ÁiÁ {øÚÄ E÷»õPU P»øÁPÒ
(C) C¸ £›©õn E÷»õPU P»øÁPÒ
(D) u[P® uõªµ E÷»õPU P»øÁPÒ
The alloys used for muscle wires in Robots are :
(a) Gold silver alloys
(b) Shape memory alloys
(c) Two dimensional alloys
(d) Gold copper alloys

£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12
Note : Answer any six questions. Question No. 24 is Compulsory.

16. ªß¦»® – Áøµ¯ÖUPÄ®.
Define ‘electric field’.

17. Q-Põµoø¯ GÆÁõÖ Áøµ¯øÓ ö\´Áõ´ ?

How will you define Q-factor ?

A

7 6617

18. B®¤¯º _ØÖ Âvø¯U TÖP.

State Ampere’s Circuital Law.

19. øÁµ® öáõ¼¨£uØPõÚ Põµnzøu ÂÍUSP.

Explain the reason for the glittering of diamond.

20. J¸ SÖURmk ÂøÍÄ ÁiÁø©¨¤À C¸ Aø»PÎß ö\ÔÄPÐUS
Cøh÷¯¯õÚ ÂQu® 36 : 1 GÛÀ, SÖUQk® C¸ Aø»PÎß Ãa_PÐUS
Cøh÷¯¯õÚ ÂQu® GÆÁÍÄ ?
The ratio of intensities of two waves in an interference pattern is 36 : 1. What is
the ratio of the amplitudes of the two interfering waves ?

21. J¸ E÷»õPzvß J뻧 öÁÎ÷¯ØÖ BØÓÀ Gߣøu Áøµ¯ÖUPÄ®. Auß
A»øPz u¸P.

Define work function of a metal. Give its unit.

22. Pv›¯UP ö\¯À£õk AÀ»x ]øuÄ Ãu® GßÓõÀ GßÚ ? Auß A»S GßÚ ?

What is meant by activity or decay rate ? Give its unit.

23. J¸ •Ê Aø» v¸zvUPõÚ ªß_ØÖ Áøµ£h® ÁøµP.
Draw the circuit diagram of a full wave rectifier.

24. 208C öÁ¨£{ø»°À J¸ P®¤a _¸Îß ªßuøh 3 Ω ©ØÖ® α=0.004/8C GÛÀ,
1008C öÁ¨£{ø»°À Auß ªßuøhø¯U PõsP.

If the resistance of coil is 3 Ω at 208C and α=0.004/8C then, determine its
resistance at 1008C.

A [ v¸¨¦P / Turn over

6617 8

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 33 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x3=18

Note : Answer any six questions. Question No. 33 is Compulsory.

25. ¦ÒÎ ªßxPÒ JßÔÚõÀ HØ£k® {ø» ªßÚÊzuzvØPõÚ ÷PõøÁø¯z
u¸ÂUP.

Derive an expression for electrostatic potential due to a point charge.

26. QºUPõL¤ß •uÀ ©ØÖ® Cµshõ® ÂvPøÍ TÖP.

State Kirchhoff’s First and Second Rules.

27. PõÀÁ÷Úõ«mhøµ, A®«mhµõP GÆÁõÖ ©õØÖÁõ´ Gߣøu ÂÁ›UPÄ®.

Explain the conversion of galvanometer into an ammeter.

28. J¸ _¸Ò EÒÍhUQ¯ £µ¨ø£ ©õØÖÁuß ‰»®, J¸ ªßÛ¯US Âø\ø¯
GÆÁõÖ ysh»õ® ?

How will you induce an emf by changing the area enclosed by the coil ?

29. ¤µõß÷íõ£º Á›PÒ GßÓõÀ GßÚ ? `›¯Û¾ÒÍ uÛ©[PøÍU PshÔÁvÀ
AøÁ GÆÁõÖ EuÄQßÓÚ ?

What are Fraunhofer lines ? How are they useful in the identification of elements
present in the Sun ?

A

9 6617

30. uµ¨£mkÒÍ ªß_ØÔÀ Cµsk |À¼¯À¦ øh÷¯õkPÒ £hzvÀ Põmi²ÒÍÁõÖ
CønUP¨£mkÒÍÚ. ªßuøh R1 ÁÈ÷¯ £õ²® ªß÷ÚõmhzøuU PnUQkP.

The given circuit has two ideal diodes connected as shown in figure below.
Calculate the current flowing through the resistance R1.

31. JΨ£õøu GßÓõÀ GßÚ ? JΨ£õøu°ß \©ß£õmøh GÊv Av¾ÒÍ
JÆöÁõ¸ SÔ±k® Gøua _mkQßÓx GߣøuU TÖP.

What is optical path ? Write down the equation for optical path and mention what
each term represents.

32. H÷uÝ® ‰ßÖ J뻧 ÂøÍÄ ÂvPøÍ GÊxP.

Write any three Laws of Photoelectric Effect.

33. 1 kg {øÓ²ÒÍ 235
92 U ¤ÍÄÖ® ÷£õx öÁΨ£k® BØÓø» áü¼À PnUQkP.

Calculate the amount of energy released in joules when 1 kg of 235

92 U undergoes
fission reaction.

A [ v¸¨¦P / Turn over

6617 10

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÷PÒÂPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

34. (A) (i) {ø»ªßÛ¯¼ß T¾® Âv°øÚU TÖP.
(ii) T¾® Âø\US® ¦ÂDº¨¦ Âø\US® Cøh÷¯¯õÚ ÷ÁÖ£õkPøÍU
TÖP.
AÀ»x
(B) J롧 ÷ÁPzøuU PshÔ²® L¤ë² (Fizeau) •øÓø¯ ÂÁ›UPÄ®.
(a) (i) State Coulomb’s Law in electrostatics.
(ii) State the differences between Coulomb force and Gravitational force.
OR
(b) Describe the Fizeau’s method to determine the speed of light.

35. (A) ø\U÷Íõmµõß C¯[S® •øÓø¯ ›ÁõP ÂÍUPÄ®.
AÀ»x
(B) JØøÓ ¤ÍÂÚõÀ HØ£k® Âή¦ ÂøÍÂøÚ ÂÁ›zx n &Áx
]Ö©zvØPõÚ {£¢uøÚø¯¨ ö£ÖP.
(a) Discuss the working of Cyclotron in detail.
OR
(b) Discuss the diffraction at single slit and obtain the condition for nth minimum.

36. (A) öuõhº RLC _ØÔÀ, ö\¾zu¨£mh ªßÚÊzu ÷ÁÖ£õk ©ØÖ® ªß÷Úõmh®
Cøh÷¯ EÒÍ PmhU ÷PõnzvØPõÚ \©ß£õmøhz u¸ÂUPÄ®.
AÀ»x
(B) G»UmµõÛß Aø» C¯À¤øÚ ÂÁ›US® ÷hÂ\ß & öẩº ÷\õuøÚø¯
ÂÁ›UPÄ®.
(a) Derive an expression for phase angle between the applied voltage and current
in a series RLC circuit.
OR

(b) Describe Davisson-Germer experiment which demonstrated the wave nature
of the electrons.

A

11 6617

37. (A) ªß÷Úõmhzvß ~s©õv›U öPõÒøPø¯ ÂÁ›zx, Av¼¸¢x K®
Âv°ß ~s ÁiÁzøu¨ ö£ÖP.
AÀ»x
(B) ÷£õº Aq©õv›ø¯ £¯ß£kzv G»UmµõÛß n &Áx _ØÖ¨£õøu°ß Bµ®
©ØÖ® vø\÷ÁPzvØPõÚ ÷PõøÁø¯ Á¸ÂUPÄ®.
(a) Describe the microscopic model of current and obtain microscopic form of
Ohm’s Law.

OR

(b) Derive an expression for Radius and Velocity of an electron in the nth orbit
using Bohr atom model.

38. (A) (i) ªß Põ¢u Aø»PÎß £s¦PøÍU TÖP.
(ii) FhP® JßÔß J¨¦ø© Põ¢u Em¦SvÓß 2.5 ©ØÖ® J¨¦ø©
ªßÂkvÓß 2.25 GÛÀ AÆÅhPzvß JλPÀ GsønU PõsP.
AÀ»x
(B) öuÎÁõÚ ªß_ØÖ £hzxhß iµõß]ìhº ö£¸UQ¯õPa ö\¯À£kÁøu
ÂÁ›UPÄ®. EÒÏk ©ØÖ® öÁαk Aø» ÁiÁ[PøÍ ÁøµP.
(a) (i) Write down the properties of electromagnetic waves.

(ii) The relative magnetic permeability of the medium is 2.5 and the relative
electrical permittivity of the medium is 2.25. Compute the refractive
index of the medium.

OR

(b) Describe the function of a transistor as an amplifier with the neat circuit
diagram. Sketch the input and output waveforms.

-o0o-

A [ v¸¨¦P / Turn over