TN 12th Question Paper 2024 Physics

TN PUBLIC EXAM

QUESTION
PAPER
2024

No. of Printed Pages : 11
7417
£vÄ Gs
A Register Number

!7417Physics!
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 |õßS ©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

7417 2

1. `›¯ ªßP»ß __________ 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 :

(a) Photovoltaic action (b) Diffusion

(c) Carrier flow (d) Recombination

2. 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 amplitude of the magnetic field is 3×10−6 T, then the amplitude 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

3. J¸ öµõmi _k® ªßC¯¢vµ® 240 V &CÀ ö\¯À£kQÓx. Auß ªßuøh 120 Ω
GÛÀ, Auß vÓß :

(A) 240 W (B) 400 W

(C) 480 W (D) 2 W

A toaster operating at 240 V has resistance of 120 Ω. Its power is :

(a) 240 W (b) 400 W

(c) 480 W (d) 2W

A

3 7417

4. n=1 _ØÖ¨£õøuUS A¯Û¯õUP AÊzu® 122.4 V öPõsh H - ©õv› AqÂß
Aq Gs :

(A) 3 (B) 4 (C) 2 (D) 1

Atomic number of H - like atom with ionization potential 122.4 V for n=1 is :

(a) 3 (b) 4 (c) 2 (d) 1

5. J롧 SÖUPø»¨ £s¤øÚ öÁΨ£kzx® {PÌÄ :

(A) JÎa]uÓÀ (B) SÖURmk ÂøÍÄ

(C) uÍÂøÍÄ (D) Âή¦ ÂøÍÄ

The transverse nature of light is shown in :

(a) scattering (b) interference

(c) polarisation (d) diffraction

6. J¸ Aø»ÄÖ® LC _ØÔÀ ªß÷uUQ°À EÒÍ ö£¸© ªßÞmh® Q BS®.
BØÓ»õÚx ªß ©ØÖ® Põ¢u¨¦»[PÎÀ \©©õP ÷\ªUP¨£k® ÷£õx,
ªßÞmhzvß ©v¨¦ :

Q Q
(A) Q (B) (C) Q (D)
2 2 3

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the
capacitor when the energy is stored equally between the electric and magnetic field is :

Q Q Q
(a) (b) (c) Q (d)
2 2 3

A [ v¸¨¦P / Turn over

7417 4

7. ‘l’ }Í•® ‘P m ’ Põ¢u v¸¨¦zvÓÝ® öPõsh \mhPõ¢u® JßÖ £hzvÀ
Põmi²ÒÍÁõÖ ÂÀ ÷£õßÖ ÁøÍUP¨£mkÒÍx. \mhUPõ¢uzvß ¦v¯ Põ¢u
C¸•øÚ v¸¨¦z vÓÛß ©v¨¦ :

2 1 3
(A) π Pm (B) P m (C) 2 Pm (D) π
Pm

A bar magnet of length ‘l’ and magnetic moment ‘Pm’ is bent in the form of an arc as shown
in figure. The new magnetic dipole moment will be :

2 1 3
(a) Pm (b) Pm (c) Pm (d) Pm
π 2 π

8. vø\ö¯õ¨¦ £s¤øÚ¨ ö£ØÓ FhPzvß ÁÈ÷¯ ö\À¾® J롧 ÷ÁP®,
¤ßÁ¸ÁÚÁØÖÒ GuøÚa \õº¢xÒÍx ?
(A) £µÄ® ußø©
(B) Auß JÎaö\ÔÄ
(C) FhPzøu¨ ö£õÖzx 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 w.r.t. medium
(d) its wavelength

A

5 7417

9. J¸ öuõhº RL _ØÔÀ, ªßuøh ©ØÖ® ªßyshÀ ªß©Ö¨¦ Cµsk® \©©õP
EÒÍÚ. _ØÔÀ ªßÚÊzu ÷ÁÖ£õk ©ØÖ® ªß÷Úõmh® Cøh÷¯ EÒÍ Pmh
÷ÁÖ£õk :

π π π
(A) 6 (B) 4 (C) _È (D) 2

In a series RL circuit, the resistance and inductive reactance are the same. Then the phase
difference between voltage and current in the circuit is :

π π π
(a) (b) (c) Zero (d)
6 4 2

10. q 1 ©ØÖ® q 2 BQ¯÷|ºªßÞmh AÍÄ öPõsh C¸ J÷µ ©õv›¯õÚ
ªßPhzx¨ £¢xPÎß ø©¯[PÒ ‘r’ CøhöÁΰÀ ¤›UP¨£mkÒÍÚ. AÁØøÓ
Jß÷ÓõöhõßÖ öuõha ö\´xÂmk ¤ßÚº A÷u CøhöÁΰÀ ¤›zx øÁUP¨&
£kQßÓÚ GÛÀ, AÁØÔØS Cøh÷¯¯õÚ Âø\ :

(A) •ßø£ Âh AvP©õP C¸US®

(B) •ßø£ ÂhU SøÓÁõP C¸US®

(C) _È

(D) A÷u¯ÍÄ C¸US®

Two identical conducting balls having positive charges q1 and q2 are separated by a center to
center distance ‘r’. If they are made to touch each other and then separated to the same
distance, the force between them will be :

(a) more than before

(b) less than before

(c) zero

(d) same as before

A [ v¸¨¦P / Turn over

7417 6

11. ‰ßÖ ªß÷uUQPÒ £hzvÀ EÒÍÁõÖ •U÷Põn ÁiÁø©¨¤À CønUP¨&
£mkÒÍÚ. A ©ØÖ® C BQ¯ ¦ÒÎPÐUQøh÷¯ EÒÍ Cøn©õØÖ ªß÷uUSz
vÓß :

(A) 4 µF (B) 2 µF (C) 8 µF (D) 6 µF

Three capacitors are connected in triangle as shown in figure. The equivalent capacitance
between the points A and C is :

(a) 4 µF (b) 2 µF (c) 8 µF (d) 6 µF

12. J뻧 öÁÎ÷¯ØÖ BØÓÀ 3.313 eV öPõsh J¸ E÷»õP¨£µ¨¤ß £¯ß
öuõhUP Aø»}Í® :

(A) 6000 Å (B) 4125 Å (C) 2062.5 Å (D) 3750 Å

The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV :

(a) 6000 Å (b) 4125 Å (c) 2062.5 Å (d) 3750 Å

A

7 7417

13. {÷PõÀ £mhP® ÁȯõPa ö\À¾® JÎ :
(A) •ÊÁx® uÍÂøÍÄ Aøh²®
(B) £Sv uÍÂøÍÄ Aøh²®
(C) }ÒÁmh©õPz uÍÂøÍÄ Aøh²®
(D) uÍÂøÍÄ Aøh¯õx
Light transmitted by Nicol prism is :
(a) plane polarised
(b) partially polarised
(c) elliptically polarised
(d) unpolarised

14. Dº¨¦ Aø»PøÍ P¸zv¯»õP •ßö©õÈ¢uÁº :
(A) BÀ£ºm Ißìjß (B) Põßµõm ÷µõßmöáß
(C) GmÁõºk £ºö\À (D) ÷©› Q³›
The gravitational waves were theoretically proposed by :
(a) Albert Einstein (b) Conrod Rontgen
(c) Edward Purcell (d) Marie Curie

15. AøÓ öÁ¨£{ø»°À ]¼UPõÛß Â»UP¨£mh BØÓÀ CøhöÁÎ ©v¨¦ :
(A) 1.1 V (B) 0.7 eV
(C) 1.1 eV (D) 0.7 V
The value of forbidden energy gap for Si at room temperature is :
(a) 1.1 V (b) 0.7 eV
(c) 1.1 eV (d) 0.7 V

£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 24 &US
Pm-hõ-¯-©õP Âøh-¯-ÎU-P-Ä®. 6x2=12
Note : Answer any six questions. Question No. 24 is compulsory.

16. Põ¢uz u¯UP® GßÓõÀ GßÚ ?
What is meant by hysteresis ?

17. ©õ»]ß Âvø¯U TÖP.
State Malus’ Law.

18. {ø» ªßÚÊzu® & Áøµ¯ÖUPÄ®.
Define Electrostatic Potential.

A [ v¸¨¦P / Turn over

7417 8

19. J¸ ÷|µõÚ E÷»õPU P®¤¯õÚx 4 mWb £õ¯® öPõsh Põ¢u¨¦»zøu 0.4 s
÷|µzvÀ PhUQÓx. P®¤°À ysh¨£mh ªßÛ¯US Âø\°ß Gs©v¨ø£U
PõsP.
A straight metal wire crosses a magnetic field of flux 4 mWb in a time 0.4 sec. Find the
magnitude of the emf induced in the wire.

20. ^ö£U ÂøÍÂß £¯ß£õkPÒ ¯õøÁ ?
State the applications of Seebeck Effect.

21. J¸ Pv›¯UP ©õv›°ß Aøµ B²mPõ»® 5.01 |õmPÒ. Auß ]øuÄ ©õÔ¼ø¯U
PnUQkP.
The half-life of radioactive sample is 5.01 days. Calculate the decay constant.

22. ªßPõ¢u Aø»PÒ GßÓõÀ GßÚ ?
What are electromagnetic waves ?

23. \õº£ÎzuÀ GßÓõÀ GßÚ ? Auß ÁøPPÒ ¯õøÁ ?
What is meant by biasing ? Mention its types.

24. 150 cm S¯zyµ® öPõsh Psnõi¯õÀ ö\´¯¨£mh ö»ßêß vÓøÚU
PõsP.
If the focal length is 150 cm for a lens, what is the power of the lens ?

£Sv & III / PART - III
SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 33 &US
Pm-hõ-¯-©õP Âøh-¯-ÎU-P-Ä®. 6x3=18
Note : Answer any six questions. Question No. 33 is compulsory.

25. ¥mhõ+ (β+) ]øuÄ {PÌÂøÚ GkzxUPõmkhß ÂÍUSP.
Discuss the Beta+ (β+) decay process with an example.

26. 0.5 mm 2 SÖUS öÁmk¨£µ¨¦ öPõsh uõªµUP®¤°À, 0.2 A AÍÄÒÍ
ªß÷Úõmh® £õ´QÓx. AzuõªµU P®¤°À EÒÍ PmkÓõ G»UmµõßPÎß
Ahºzv 8.4×1028 m−3 GÛÀ CUPmkÓõ G»UmµõÛß Cʨ¦zvø\ ÷ÁPzøuU
PnUQkP.
A copper wire of cross-sectional area 0.5 mm2 carries a current of 0.2 A. If the free electron
density of copper wire is 8.4×1028 m−3, then compute the drift velocity of free electron.

A

9 7417

27. JßøÓ JßÖ öuõmkU öPõsi¸US® ö»ßìPÐUPõÚ öuõS£¯ß S¯z
yµzvØPõÚ \©ß£õmøh¨ ö£ÖP.
Derive the equation for effective focal length for lenses in contact.

28. ªß÷Úõmh EnºvÓøÚ Áøµ¯ÖUPÄ®. PõÀÁ÷Úõ«mh›ß ªß÷Úõmh
EnºvÓøÚ AvP›US® ÁÈ•øÓPøÍU TÖP.
Define current sensitivity. State the factors which increase the current sensitivity of a
galvanometer.

29. 50 mW vÓÝ® 640 nm Aø»}Í•® öPõsh ÷»\º Jΰ¼¸¢x J¸ ÂÚõiUS
GzuøÚ L÷£õmhõßPÒ öÁΨ£k® ?
How many photons per second emanate from a 50 mW laser of 640 nm ?

30. Á›a_¸Îß }Í©õÚx Auß Âmhzøu Âh ö£›¯x GÚU P¸v, Auß
ªßyshÀ GsoØPõÚ \©ß£õmøhz u¸ÂUPÄ®.
Derive the equation for inductance of a solenoid. Assume that the length of the solenoid is
greater than its diameter.

31. SÖURmk ÂøÍÄUS®, Âή¦ ÂøÍÄUS® EÒÍ ÷ÁÖ£õkPÒ ¯õøÁ ?
What are the differences between interference and diffraction ?

32. T¾® Âv°¼¸¢x Põì Âvø¯¨ ö£ÖP.
Obtain Gauss law from Coulomb’s law.

33. GaAsP SøÓ Phzv°ÚõÀ E¸ÁõUP¨£mh LED &¼¸¢x öÁΨ£k® Jΰß
Aø»}Ízøu Psk¤iUPÄ®. C¢uU SøÓPhzv°ß »UP¨£mh BØÓÀ
CøhöÁÎ 1.875 eV BS®. öÁΨ£k® J롧 {Ózøu²® SÔ¨¤kP .
(h=6.6×10−34 Js GÚU öPõÒP).
Determine the wavelength of the light emitted from LED, which is made up of GaAsP
semiconductor, whose forbidden energy gap is 1.875 eV. Mention the colour of the light
emitted (Given h=6.6×10−34 Js).

A [ v¸¨¦P / Turn over

7417 10

£Sv & IV / PART - IV

SÔ¨¦ : AøÚz-x ÂÚõU-P-ÐU-S® Âøh-¯-ÎU-P-Ä®. 5x5=25

Note : Answer all the questions.

34. (A) Gί ~s÷nõUQ JßÔøÚ ÂÁ›zx, Asø©¨¦ÒÎ S¯¨£kzxuÀ
©ØÖ® C¯À¦{ø»U S¯¨£kzxu¼À HØ£k® E¸¨ö£¸UP[PÐUPõÚ
\©ß£õkPøͨ ö£ÖP.

AÀ-»-x

(B) «mhº \©Úa_ØøÓ¨ £¯ß£kzv öu›¯õu ªßuøhø¯ Põs£øu ÂÍUSP.
(a) Explain about simple microscope and obtain equation for magnification for near point
focusing and normal focusing.

OR

(b) Explain the determination of unknown resistance using metre bridge.

35. (A) £¯m&\õÁºm Âvø¯¨ £¯ß£kzv, ªß÷Úõmh® £õ²® ÁmhÁiÁU
P®¤a_¸Îß Aa_ ÁÈ÷¯ J¸ ¦ÒΰÀ HØ£k® Põ¢u¨¦»zøuU
PnUQkP. _¸Îß ø©¯zvÀ Põ¢u¨¦»zvØPõÚ \©ß£õmøh GÊxP.

AÀ-»-x

(B) •¨£mhP® JßÔß vø\©õØÓU ÷PõnzvØPõÚ \©ß£õmøh Á¸Âzx,
Av¼¸¢x •¨£mhP® ö\´¯¨£mkÒÍ ö£õ¸Îß JλPÀ GsønU
Põs£uØPõÚ ÷PõøÁø¯ Á¸ÂUPÄ®.
(a) Calculate the magnetic field produced at a point along the axis of the current carrying
circular coil. Write down the equation of the magnetic field at the center of the coil
using Biot-Savart law.

OR

(b) Derive the equation for angle of deviation produced by a prism and thus obtain the
equation for refractive index of material of the prism.

A

11 7417

36. (A) uS¢u ÂÍUP[PÐhß IßìjÛß J뻧 \©ß£õmøh¨ ö£ÖP.
AÀ-»-x
(B) ªßysia _ØÔÀ ªßÚÊzu ÷ÁÖ£õk ©ØÖ® ªß÷Úõmh® Cøh÷¯
EÒÍ Pmhz öuõhºø£U PõsP. Pmh ©ØÖ® Aø» Áøµ£h[PøÍ ÁøµP.
(a) Obtain Einstein’s photoelectric equation with necessary explanations.
OR
(b) Find out the phase relationship between the voltage and current in a pure inductive
circuit. Draw the phasor and wave diagrams.

37. (A) AvºöÁs £s÷£ØÓzvß |ßø©PÒ ©ØÖ® Áµ®¦PøÍ Á›ø\¨£kzxP.
AÀ-»-x
(B) B®¤¯›ß _ØÖ Âv°À ÷©UìöÁÀ ö\´u ©õØÓzøu ÂÍUSP.
(a) List out the advantages and limitations of frequency modulation.
OR
(b) Explain the Maxwell’s modification of Ampere’s circuital law.

38. (A) ªß C¸•øÚ JßÔÚõÀ, Auß Aa_U÷PõmiÀ J¸ ¦ÒΰÀ HØ£k®
ªß¦»zøuU PõsP.
AÀ-»-x
(B) AqUP¸ Eø» GßÓõÀ GßÚ ? uo¨£õßPÒ, Pmk¨£kzx® uskPÒ
©ØÖ® SκÂUS® Aø©¨¦ £ØÔ SÔ¨¦ GÊxP.
(a) Calculate the electric field due to a dipole at a point on the axial line.
OR
(b) What is nuclear reactor ? Write note on Moderators, Control rods and Cooling system.

-oOo-

A [ v¸¨¦P / Turn over

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