TN 12th Question Paper 2026 Physics

FOR TN 12TH EXAM PREPARATION

TN 12th 2026
Question Paper ·
Physics
EXAM YEAR TYPE SUBJECT

TN 12th 2026 Question Paper Physics

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 11
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9017
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!9017Physics!
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PART - III
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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 m
PsPõo¨£õÍ›h® EhÚi¯õPz öu›ÂUPÄ®.
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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.

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15x1=15

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Âøhø¯z ÷uº¢öukzxU SÔ±mkhß Âøh°øÚ²® ÷\ºzx
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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

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9017 2

1. q©ØÖ® BQ¯ ÷|º ªßÞmh AÍÄ öPõsh C¸ J÷µ ©õv›¯õÚ ªßPhzx¨
1
q
2

£¢xPÎß ø©¯[PÒ CøhöÁΰÀ ¤›UP¨£mk EÒÍÚ. AÁØøÓ
r

Jß÷ÓõöhõßÖ öuõha ö\´xÂmk ¤ßÚº A÷u CøhöÁΰÀ ¤›zx
øÁUP¨£kQßÓÚ GÛÀ, AÁØÔØS Cøh÷¯¯õÚ Âø\ :

(A) _È

(B) •ßø£ ÂhU SøÓÁõP C¸US®

(C) •ßø£ Âh AvP©õP C¸US®

(D) A÷u¯ÍÄ C¸US®

Two identical conducting balls having positive charges q and q are separated by a centre to
1 2

centre distance r. If they are made to touch each other and then separated to the same

distance, the force between them will be :

(a) zero

(b) less than before

(c) more than before

(d) same as before

2. J÷µ }Í•® ©ØÖ® J÷µ ö£õ¸ÍõÀ ö\´¯¨£mh ©ØÖ® GßÓ C¸ P®¤PÒ A B

Ámh ÁiÁ SÖUS £µ¨ø£ öPõskÒÍÚ. GÛÀ, P®¤°ß BµzvØS® R
A
= 3R
B
A

BP®¤°ß BµzvØS® Cøh¨£mh uPÄ GßÚ ?

1 1
(A) 3
(B) 3 (C) 3
(D) 3

Two wires of A and B with circular cross section are made up of the same material with

equal lengths. Suppose R = 3R , then what is the ratio of radius of wire A to that of B ?
A B

1 1
(a) (b) 3 (c) (d) 3
3 3

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3. qªßÞmh•®, {øÓ²® ©ØÖ® Bµ•® öPõsh ªßPhzuõ Áøͯ® JßÖ
m r

ωGßÓ ^µõÚ ÷Põn ÷ÁPzvÀ _ÇØÓ¨£kQÓx GÛÀ, Põ¢uz v¸¨¦zvÓÝUS®
÷Põn E¢uzvØS® EÒÍ ÂQu® GßÚ ?
2q q

m
q q
(A) (B) (C) (D)
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m 2m

m
4m m

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A non conducting charged ring carrying a charge of q, mass m and radius r is rotated about

m s e m
s e
its axis with constant angular speed ω. The ratio of its magnetic moment with angular
l a
l
momentum is :

g a ag
a
2q q q q
(a) (b) (c) (d)
m 2m 4m m

4. ªß÷Úõmh©õÚx ÷|µzvÀ &¼¸¢x
0.05 s BP ©õÔÚõÀ, _¸ÎÀ +2A −2A 8 V

ªßÛ¯US Âø\ ysh¨£kQÓx. _¸Îß uß ªß yshÀ Gs :

om
(A) 0.4 H (B) 0.2 H (C) 0.8 H (D) 0.1 H

. c
m
When the current changes from +2A to −2A in 0.05 s, an emf of 8 V is induced in a coil. The

e
coefficient of self induction of the coil is :

las
(a) 0.4 H (b) 0.2 H
ag (c) 0.8 H (d) 0.1 H

5. ¤ßÁ¸ÁÚÁØÖÒ Gx ªßPõ¢u Aø»ø¯ E¸ÁõUP¨ £¯ß£kQÓx ?
(A) ^µõÚ vø\÷ÁPzvÀ C¯[S® ªßxPÒ
(B) •kUSÂUP¨£mh ªßxPÒ
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(C) K´Ä {ø»°¾ÒÍ ªßxPÒ
om ªßÞmh©ØÓ J¸ xPÒ
c. (D) e m
e m l as
las Which one of them is used to produce a propagating electromagnetic wave ?

ag
ag (a) a charge moving with constant velocity

(b) an accelerating charge

(c) a stationary charge particle

(d) an uncharged particle

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9017 4

6. vø\ö¯õ¨¦ £s¤øÚ¨ ö£ØÓ FhPzvß ÁÈ÷¯ ö\À¾® Jΰß
(Isotropic)

÷ÁP®, ¤ßÁ¸ÁÚÁØÖÒ GuøÚa \õº¢xÒÍx ?
(A) £µÄ® ußø©
(B) Auß JÎaö\ÔÄ
(C) FhPzøu¨ ö£õ¸zx JΉ»zvß C¯UP®
(D) Auß Aø»}Í®
The speed of light in an isotropic medium depends on :

(a) the nature of propagation

(b) its intensity

(c) the motion of the source with respect to medium

(d) its wavelength

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 GÆÁÍÄ
C¸UP ÷Ásk® ? (öuõø»Ä ) D

D D
(A) 2 D (B) 2
(C) 2
(D) 2D

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

8. öÁ¨£ BØÓø» EmPÁºÁuõÀ G»Umµõß EªÇ¨£kÁx __________ EªÌÄ
GÚ¨£k®.
(A) ¦» (B) öÁ¨£ A¯Û
(C) J뻧 (D) Cµshõ® {ø»
Emission of electrons by the absorption of heat energy is called _________ emission.

(a) field (b) thermionic

(c) photoelectric (d) secondary

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7
9.
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Li AqUP¸Âß {øÓ¯õÚx Av¾ÒÍ AøÚzx {³UίõßPÎß ö©õzu
7
{øÓø¯ Âh SøÓÁõP EÒÍx GÛÀ,
0.042 u
3
Li AqUP¸Âß J¸
{³UίõÝUPõÚ ¤øn¨£õØÓÀ :
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(A) (B)
23 MeV (C) 46 MeV 5.6 MeV (D) 3.9 MeV

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7
The mass of a Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The

e
3

m l as
as
average binding energy per nucleon of

l
7

3
Li nucleus is nearly :

ag
(a)

ag
23 MeV (b) 46 MeV (c) 5.6 MeV (d) 3.9 MeV

10. `›¯ ªßP»ß C¢uz uzxÁzvß Ai¨£øh°À ö\¯À£kQÓx.
(A) JÎ ÷ÁõÀhõ ö\¯À£õk (B) µÁÀ
(C) Fºv°ß £õ´Ä (D) ©Ö Cøn¨¦
The principle based on which a solar cell operates is :

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(a) Photovoltaic action (b) Diffusion

(c) Carrier flow (d)
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Recombination

s em
11.

g la {øÓø¯ AÎUS® xPÒ :
¦÷µõmhõßPÒ ©ØÖ® {³mµõßPÐUS
(A) |õ÷Úõ xPÒ a (B) îUì xPÒ
(C) ÷£µÍÄ xPÒ (D) Ißìjß xPÒ
The particle which gives mass to protons and neutrons are :

(a) Nano particle (b) Higgs particle

(c) Bulk particle (d) Einstein particle

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→
2
ɵ ɵ) Am GßÓ öÁUhº ©v¨¦øh¯ Põ¢u C¸•øÚ¯õÚx,
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12. p = −0.5i + 0.4 j

m
m

m s e
a
→

s e B = 2 j T GßÓ ^µõÚ Põ¢u¨¦»zvÀ øÁUP¨£mhõÀ Auß {ø»¯õØÓÀ ©v¨¦ :
ɵ
g l
g la (A) 0.1 J (B) −0.1 J (C) 0.8 J a (D) −0.8 J

a →
2
The potential energy of a magnetic dipole whose dipole moment is p
m
( ɵ
= −0.5i + 0.4 j
ɵ) Am

→
kept in uniform magnetic field B =2j T
ɵ :

(a) 0.1 J (b) −0.1 J (c) 0.8 J (d) −0.8 J

M [ v¸¨¦P / Turn over

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9017 6

13. ¤ßÁ¸ÁÚÁØÖÒ \© ªßÚÊzu¨ £µ¨ø£ ö£õ¸zx \›¯õÚ TØÖ/TØÖPÒ
GøÁ ?
(A) öÁÆ÷ÁÖ \© ªßÚÊzu¨ £µ¨¤ØS ªßÚÊzu® öÁÆ÷ÁÓõP C¸US®.
(B) \© ªßÚÊzu¨ £µ¨¦US ö\[SzuõP÷Á ªß¦»® G¨÷£õx® Aø©²®.
(C) C¸ ¦ÒÎPÐUS Cøh÷¯ ªßÞmh® öPõsh ªßxPøÍ |Pºzu
ö\´¯¨£k® ÷Áø» _ȯõS®.
(D) ÷©ØPsh AøÚzx®.
Which of the following statement is/are true for equipotential surface ?

(a) The potential is different for different equipotential surfaces.

(b) Electric field must always be normal to equipotential surface.

(c) Work done to move a charge between any two points is zero.

(d) All of the above

14. PõÀø\m £iPzvÝÒ, Jΰ¯À Aa]À A\õuõµnU Pv¸US®, \õuõµnU
Pv¸US® Cøh÷¯ EÒÍ vø\÷ÁP[PÎß ÂQu® :
(A) 2 : 1 (B) (C) (D)
1 : 1.5 1 : 2 1 : 1

Inside the calcite crystal, along the optic axis, the ratio of velocities of extraordinary ray to

ordinary ray is :

(a) 2 : 1 (b) 1 : 1.5 (c) 1 : 2 (d) 1 : 1

15. J¸ Âsnø»U P®¤°ß ö|kUP® 64 Q.«. GÛÀ, Âsnø»U P®¤°ß E¯µ®
(¦Â°ß Bµ® Q.«.) :6400

(A) « 32 (B) Q.«. 0.32 (C) 640 « (D) 32 Q.«.
The range of the antenna is 64 km, then its height is (Radius of the earth is 6400 km) :

(a) 32 m (b) 0.32 km (c) 640 m (d) 32 km

£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. áü¼ß öÁ¨£ Âvø¯U TÖP.
State Joule’s law of heating.

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18. ysh¨£mh ªßÛ¯US Âø\ø¯ E¸ÁõUS® ÁÈPøÍU SÔ¨¤kP.
Mention the ways of producing induced emf.

19. ø©U÷µõ Aø»PÎß H÷uÝ® Cµsk £¯ß£õkPøÍU TÖP.
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Give any two uses of microwaves.

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20. 150
e m
ö\.«. S¯zyµ® öPõsh Psnõi¯õÀ ö\´¯¨£mh ö»ßêß vÓøÚU
l as
PõsP.
l as ag
ag
If the focal length is 150 cm for a lens, what is the power of a lens ?

21. £¸¨ö£õ¸Ò Aø»PÒ GßÓõÀ GßÚ ?
What are matter waves ?

22. ÷Pz÷uõk PvºPÎß £s¦PøÍ GÊxP. (H÷uÝ® Cµsk)
Write the properties of cathode rays. (any two)
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23. ö£õx EªÌ¨£õß {ø» Aø©¨¤À
s e (CE) J¸ NPN iµõß]ìhº ªß_ØÖ
ÁiÁø©¨¦ £hzøu ÁøµP.
g la
a
Draw the schematic circuit diagram for a NPN transistor in common emitter configuration.

24. AP»® öPõsh JØøÓ¨ ¤ÍÄ JßÔß ÁÈ÷¯
5 µm D Aø»}Í® Eøh¯ 5000

JÎ ö\ÀÁuõÀ Âή¦ ÂøÍÄ HØ£kQßÓx. CuÚõÀ E¸ÁõS® Âή¦
ÂøÍÄ ÁiÁø©¨¤ß ö£¸© Á›ø\ GßÚ ?
Light of wavelength of 5000 D produces diffraction pattern of the single slit of width 5 µm.

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What is the maximum order of diffraction possible ?

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s e £Sv & III / PART - III

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

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

25. ªß÷uUQPÎß £¯ß£õkPøÍ GÊxP.
Write the applications of capacitors.

M [ v¸¨¦P / Turn over

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9017 8

26. Cµsk ªßuøh¯õUQPÒ öuõh›øn¨¦ ©ØÖ® £UP Cøn¨¦PÎÀ
56
CønUP¨£k® ÷£õx öuõS£¯ß ªßuøhPÒ •øÓ÷¯ 15 Ω ©ØÖ® 15
Ω GÛÀ,
uÛzuÛ ªßuøhPÎß ©v¨¦PøÍ PõsP.
Two resistors when connected in series and parallel, their equivalent resistances are 15 Ω

56
and Ω respectively. Find the values of the resistances.
15

27. PõÀÁÚõ«mh›ß ªß÷Úõmh Enº vÓøÚ Áøµ¯Ö. AuøÚ GÆÁõÖ
AvP›UP»õ® ?
Define the current sensitivity of a galvanometer and how it can be increased ?

28. J¸ _ØÔÀ AC &Cß \µõ\› vÓÝUPõÚ ÷PõøÁø¯¨ ö£ÖP.
Obtain an expression for average power of AC over a cycle.

29. ©õÖ{ø»U ÷Põn® GßÓõÀ GßÚ ? ©õÖ{ø»U ÷PõnzvØPõÚ \©ß£õmøh¨
ö£ÖP.
What is Critical angle ? Obtain the equation for Critical angle.

30. SÖURmk ÂøÍÄUS®, Âή¦ ÂøÍÄUS® EÒÍ ÷ÁÖ£õkPÒ ¯õøÁ ?
Mention the differences between Interference and Diffraction.

31. AøÚzx AqUP¸UPÎß (Z >10) AqUP¸ Ahºzv ©õÔ¼ GÚU PõmkP.
Show that nuclear density is almost constant for nuclei with Z >10.

32. AND÷Pmiß ªß_ØÖ SÔ±k, »õâU ö\¯À£õk, Esø© AmhÁøn ©ØÖ®
§¼¯ß \©ß£õmøhz u¸P.
Give the circuit symbol, logical operation, truth table and Boolean expression of AND gate.

33. E÷»õP¨£µ¨¦ JßÔß «x AvºöÁs öPõsh JÎ £k®÷£õx
9×10
14
Hz

öÁΨ£k® JÎ G»UmµõßPÎß ö£¸© ÷ÁP® GÛÀ, E÷»õP¨ 8.14×10
5
ms
−1

£µ¨¤ß £¯ßöuõhUP AvºöÁsønU PnUQkP.
14
When a light of frequency 9×10 Hz is incident on a metal surface, photoelectrons are

5 −1
emitted with a maximum speed of 8.14×10 ms . Determine the threshold frequency of

the surface.

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£Sv & IV/PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

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34.

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(A) ªß C¸•øÚ JßÔÚõÀ HØ£k® {ø» ªßÚÊzuzvØPõÚ ÷PõøÁø¯¨
s e m
ö£ÖP.
s em l a
g la AÀ»x ag
a
(B) JÎ CøÇz uPÁÀöuõhº¦ GßÓõÀ GßÚ ? AÁØÔß |ßø©PÒ ©ØÖ®
SøÓ£õkPøÍ GÊxP.
(a) Derive an expression for electrostatic potential due to an electric dipole.

OR

(b) What is Fibre Optic Communication ? Write its merits and demerits.

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35.
s em
(A) «mhº \©Úa_ØøÓ £¯ß£kzv öu›¯õu ªßuøhø¯ Põs£øu ÂÍUSP.

g la
a AÀ»x
(B) J뻧 ÂøÍÄ ÂvPøÍ £mi¯¼kP.
(a) Explain the determination of unknown resistance using meter bridge.

OR

(b) List out the laws of photoelectric effect.

o m
om ÷©UìöÁÀ \©ß£õkPøÍ öuõøP ~sPou ÁiÂÀ GÊxP. . c
c. (A)
36.

e m
e m l as
l as AÀ»x
ag
ag (B) •¨£mhP® JßÔß vø\©õØÓU ÷PõnzvØPõÚ \©ß£õmøh Á¸ÂUPÄ®.
(a) Write down Maxwell equations in integral form.

OR

(b) Derive the equation for angle of deviation produced by a prism.

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9017 10

37. (A) ø\U÷Íõmµõß C¯[S® •øÓø¯ ›ÁõP ÂÍUPÄ®.

AÀ»x

(B) (i) uÍÂøÍÄ BUQ ©ØÖ® uÍÂøÍÄ B´Â GßÓõÀ GßÚ ?

(ii) ÷£õ»µõ´iß £¯ßPøÍU TÖP.

(a) Explain the working of cyclotron in detail.

OR

(b) (i) What are Polariser and Analyser ?

(ii) List the uses of Polaroids.

38. (A) (i) AqUP¸Âß ¤øn¨£õØÓÀ GßÓõÀ GßÚ ? Auß ÷PõøÁø¯
GÊxP.

4
(ii) ¤ßÁ¸® uPÁÀPøͨ £¯ß£kzv 2
He AqUP¸Âß ¤øn¨¦
BØÓø»U PnUQkP.

Ｏ® AqÂß Aq{øÓ, M
A
(He) = 4.00260 u,

øímµáß AqÂß {øÓ m
H
= 1.00785 u ©ØÖ®

{³mµõÛß {øÓ m
n
= 1.008665 u.

AÀ»x

(B) (i) öuõhº RLC _ØÔß ªß Gvº¨¦ £ØÔ GÊxP.

(ii) öuõhº _ØÔÀ EÒÍ ªßysi°ß ªß©Ö¨¦, ªß÷uUQ°ß
RLC

ªß©Ö¨¦ ©ØÖ® ªßuøh BQ¯øÁ •øÓ÷¯ ©ØÖ® 184 Ω, 144 Ω

GÛÀ _ØÔß ªßGvº¨ø£U PõsP. ÷©¾® ªßÚÊzu ÷ÁÖ£õk
30 Ω

©ØÖ® ªß÷Úõmh® Cøh°»õÚ PmhU ÷Põnzøu²® PnUQkP.

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(a) (i) What is binding energy of a nucleus ? Write its expression.

4
(ii) Compute the binding energy of He nucleus using the following data :
2

m
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Atomic mass of Helium atom, M (He) = 4.00260 u,

m
A

m s e
s e
Mass of hydrogen atom, m
H
= 1.00785 u, and

l a
g l a
Mass of neutron, m
n
= 1.008665 u.
ag
a OR

(b) (i) Write about impedance of the series RLC circuit.

(ii) Find the impedance of a series RLC circuit if the inductive reactance, capacitive

reactance and resistance are 184 Ω, 144 Ω and 30 Ω respectively. Also calculate

the phase angle between voltage and current.

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