TN 11th Question Paper 2024 Physics

TN PUBLIC EXAM

QUESTION
PAPER
2024

No. of Printed Pages : 11
7617
A £vÄ Gs
Register Number

!7617IstYearPhysics!
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

7617 2

1. R1=(100±3)Ω, R2=(150±2)Ω BQ¯ C¸ ªßuøhPÒ öuõh›øn¨¤À CønUP¨&
£mkÒÍÚ. AÁØÔß öuõS£¯ß ªßuøh GßÚ ?
(A) (250±1)Ω (B) (250±5)Ω
(C) (250±3)Ω (D) (205±5)Ω
Two resistances R 1=(100±3)Ω, R 2=(150±2)Ω are connected in series. What is their
equivalent resistance ?
(a) (250±1)Ω (b) (250±5)Ω
(c) (250±3)Ω (d) (205±5)Ω

2. ©Ûuöµõ¸Áº ¦Â°ß x¸Ázv¼¸¢x |kÁøµU ÷Põmk¨ £Svø¯ ÷|õUQ
Á¸QÓõº. AÁ›ß «x ö\¯À£k® ø©¯Â»US Âø\ :
(A) ©õÓõx
(B) AvP›US®
(C) •u¼À AvP›US® ¤ß¦ SøÓ²®
(D) SøÓ²®
If a person is moving from Pole to Equator, the centrifugal force acting on him :
(a) remains the same
(b) increases
(c) first increases and then decreases
(d) decreases

3. J¸ ‰i¯ £õøuUS BØÓÀ ©õØÓõ Âø\°ÚõÀ ö\´¯¨£mh ÷Áø» :
(A) G¨÷£õx® ÷|ºUSÔ²øh¯x
(B) G¨÷£õx® GvºSÔ²øh¯x
(C) Áøµ¯ÖUP¨£hõux
(D) _È
The work done by the conservative force for a closed path is :
(a) always positive
(b) always negative
(c) not defined
(d) zero

A

3 7617

4. J¸ •øÚ ‰i¯ PõØÖz u®£® JßÖ 83 Hz AvºöÁs Eøh¯ AvºÄÖ®
ö£õ¸Ðhß JzuvºÄ AøhQÓx GÛÀ, PõØÖz u®£zvß }Í® :
(A) 1.0 m (B) 1.5 m
(C) 2.0 m (D) 0.5 m
An air column in a pipe which is closed at one end, will be in resonance with the vibrating
body of frequency 83 Hz. Then the length of the air column is :

(a) 1.0 m (b) 1.5 m

(c) 2.0 m (d) 0.5 m

5. SÖUPø» JßÖ A FhPzv¼¸¢x B FhPzvØS ö\ÀQÓx. A FhPzvÀ
SÖUPø»°ß vø\÷ÁP® 500 ms−1, Aø»}Í® 5 m. B FhPzvÀ vø\÷ÁP®
600 ms−1 GÛÀ, B &À AvºöÁs, Aø»}Í® •øÓ÷¯ :

(A) 120 Hz ©ØÖ® 6 m (B) 120 Hz ©ØÖ® 5 m
(C) 100 Hz ©ØÖ® 6 m (D) 100 Hz ©ØÖ® 5 m
A transverse wave moves from a medium A to a medium B. In medium A, the velocity of the
transverse wave is 500 ms−1 and the wavelength is 5 m. The frequency and the wavelength
of the wave in medium B when its velocity is 600 ms−1, respectively are :

(a) 120 Hz and 6 m (b) 120 Hz and 5 m

(c) 100 Hz and 6 m (d) 100 Hz and 5 m

→ ∧ ∧ ∧
6. xPöÍõßÔß vø\÷ÁP® v =2 i +t 2 j−9 k GÛÀ, t=1 ÂÚõi°À AzxPÎß
•kUPzvß Gs ©v¨¦ ¯õx ?
(A) _È (B) 1 ms−2
(C) −1 ms−2 (D) 2 ms−2
→ ∧ ∧ ∧
If the velocity is v =2 i +t 2 j−9 k , then the magnitude of acceleration at t=1 second is :

(a) zero (b) 1 ms−2

(c) −1 ms−2 (d) 2 ms−2

A [ v¸¨¦P / Turn over

7617 4

7. Cµmøh E¸ÁõUSÁx :

(A) _ÇØ] ©ØÖ® Ch¨ö£¯ºa] (B) _ÇØ] C¯UP®

(C) C¯UPªßø© (D) Ch¨ö£¯ºa] C¯UP®

A couple produces :

(a) rotation and translation (b) pure rotation

(c) no motion (d) pure translation

8. ¤ßÁ¸® Áõ²UPÎÀ, GÆÁõ² öPõkUP¨£mh öÁ¨£{ø»°À SøÓ¢u \µõ\›
C¸©i ‰» ÷ÁPzøu¨ (Vrms) ö£ØÖÒÍx ?

(A) BU]áß (B) øímµáß

(C) Põº£ß&øh&BUøék (D) ø|mµáß

Which of the following gases will have least rms speed at a given temperature ?

(a) Oxygen (b) Hydrogen

(c) Carbon-di-oxide (d) Nitrogen

9. öÁ¨£{ø» E¯¸®÷£õx vµÁ® ©ØÖ® Áõ²Âß £õS{ø» •øÓ÷¯ :

(A) SøÓ²® ©ØÖ® AvP›US® (B) AvP›US® ©ØÖ® AvP›US®

(C) SøÓ²® ©ØÖ® SøÓ²® (D) AvP›US® ©ØÖ® SøÓ²®

With an increase in temperature, the viscosity of liquid and gas, respectively will :

(a) decrease and increase (b) increase and increase

(c) decrease and decrease (d) increase and decrease

A

5 7617

10. v GßÓ vø\÷ÁPzxhß £¢x JßÖ ö\[SzuõP ÷©À÷|õUQ GÔ¯¨£kQÓx.
Ax t ÷|µzvÀ uøµø¯ AøhQÓx. ¤ßÁ¸® G¢u v-t Áøµ£h® CƯUPzvøÚ
ÂÍUSQÓx ?

(A) (B)

(C) (D)

A ball is projected vertically upwards with a velocity v. It comes back to ground in time t.
Which of the following v-t graph shows the motion correctly ?

(a) (b)

(c) (d)

A [ v¸¨¦P / Turn over

7617 6

11. J¸ ÷PõÍzvß Bµzøu AÍÂku¼À ¤øÇ 2% GÛÀ, Auß PÚ AÍøÁU
PnUQku¼ß ¤øǯõÚx :
(A) 4% (B) 8% (C) 6% (D) 2%
If the error in the measurement of radius is 2%, then the error in the determination of volume
of the sphere will be :
(a) 4% (b) 8% (c) 6% (d) 2%

12. uß öÁ¨£ HئzvÓÛß SI A»S :
(A) J kg−1 K−1 (B) J kg−1 (C) K kg−1 J−1 (D) J kg K−1
The SI unit for specific heat capacity is :
(a) J kg−1 K−1 (b) J kg−1 (c) K kg−1 J−1 (d) J kg K−1

13. 1 : 2 GßÓ ÂQuzvÀ {øÓ öPõsh A ©ØÖ® B GßÓ C¸ ö£õ¸ÒPÒ, •øÓ÷¯
kA ©ØÖ® kB _¸Ò©õÔ¼ öPõsh {øÓ¯ØÓ C¸ _¸ÒÂÀPÒ ‰»® uÛzuÛ÷¯
öuõ[PÂh¨£mkÒÍx. C¸ ö£õ¸ÒPЮ ö\[SzuõP Aø»ÄÖ®÷£õx
AÁØÔß £¸©z vø\÷ÁP[PÒ 1 : 2 GßÓ ÂQuzvÀ EÒÍ÷£õx A &°ß Ãa\õÚx
B &°ß Ãaø\¨÷£õÀ __________ ©h[PõS®.

2 kB kB 8 kB kB
(A) (B) (C) (D)
kA 2 kA kA 8 kA
Two bodies A and B whose masses are in the ratio 1 : 2 are suspended from two separate
massless springs of force constants kA and kB respectively. If the two bodies oscillate vertically
such that their maximum velocities are in the ratio 1 : 2, the ratio of the amplitude A to that
of B is __________.
2 kB kB 8 kB kB
(a) (b) (c) (d)
kA 2 kA kA 8 kA

14. ø\UQÒ h¯º vjöµßÖ öÁizx AvÀ EÒÍ PõØÖ Â›ÁøhQÓx. CuØS
__________ {PÌÄ GßÖ ö£¯º.
(A) AÊzu® ©õÓõ (B) öÁ¨£{ø» ©õÓõ
(C) £¸©ß ©õÓõ (D) öÁ¨£¨ £›©õØÓªÀ»õ
When a cycle tyre suddenly bursts, the air inside the tyre expands. This process is :
(a) isobaric (b) isothermal
(c) isochoric (d) adiabatic

15. vjöµÚ ¦Â ©ØÖ® `›¯Ûß {øÓPÒ C¸ ©h[PõP ©õÔÚõÀ AøÁPÐU&
Qøh÷¯¯õÚ Dº¨¤¯À Âø\ :
(A) 4 ©h[S AvP›US® (B) ©õÓõx
(C) 2 ©h[S SøÓ²® (D) 2 ©h[S AvP›US®
If the masses of the Earth and Sun suddenly doubled, gravitational force between them
will :
(a) increase 4 times (b) remain the same
(c) decrease 2 times (d) increase 2 times

A

7 7617

£S-v & 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. GLS AÀ»x Cµ¨£º, CÁØÔÀ Gx AvP «m]¨ £s¦ÒÍx ? Hß ?
Which one of these is more elastic, steel or rubber ? Why ?

17. öÁUhº – Áøµ¯ÖUPÄ®. GkzxUPõmkPÒ u¸P.
Define - Vector. Give examples.

18. 10 m ÁøÍÄ Bµ® öPõsh Ámh ÁiÁa \õø»°À ö\À¾® Põº, 50 ms −1
vø\÷ÁPzvÀ ÁøÍQÓx. AUPõ›ß EÒ÷Í A©º¢v¸US® 60 Q.Q. {øÓ²øh¯
©Ûuº En¸® ø©¯Â»US Âø\ø¯U PõsP.
A car takes a turn with velocity 50 ms−1 on the circular road of radius of curvature 10 m.
Calculate the centrifugal force experienced by a person of mass 60 kg inside the car.

19. ¤öµÍÛ¯ß C¯UPzøu¨ £õvUS® PõµoPøÍ GÊxP.
Write the factors affecting Brownian Motion.

20. E¸Ð® \UPµ® JßÔß {øÓ ø©¯©õÚx 5 ms−1 vø\÷ÁPzxhß C¯[SQÓx.
Cuß Bµ® 1.5 m ©ØÖ® ÷Põn vø\÷ÁP® 3 rad s−1 GÛÀ, Ca\UPµ® |ÊÄu»ØÓ
E¸Ðu¼À EÒÍuõ GÚ ÷\õvUPÄ®.
A rolling wheel has velocity of its centre of mass as 5 ms−1. If its radius 1.5 m and angular
velocity is 3 rad s−1, then check whether it is in pure rolling or not.

21. PmhØÓ Aø»ÄPÒ GßÓõÀ GßÚ ?
What is meant by free oscillation ?

A [ v¸¨¦P / Turn over

7617 8

22. «m]¯Î¨¦ SnP® – Áøµ¯ÖUPÄ®.
Define - Coefficient of Restitution.

23. £›©õn £S¨£õ´Âß Áµ®¦PÒ ¯õøÁ ?
What are the limitations of dimensional analysis ?

24. ©Ûuöµõ¸Áº 2 Q.Q. {øÓ²øh¯ }›øÚ xk¨¦ \UPµzøuU öPõsk P»USÁuß
‰»® 30 kJ ÷Áø»ø¯a ö\´QÓõº. P»US®÷£õx HÓzuõÇ 5 kcal öÁ¨£®
}›¼¸¢x öÁΨ£mk öPõÒP»Ûß £µ¨¦ ÁÈ÷¯ öÁ¨£U PhzuÀ ©ØÖ®
öÁ¨£U PvºÃa]ß ‰»® `ǾUSU Phzu¨£kQÓx GÛÀ, Aø©¨¤ß AP
BØÓÀ ©õÖ£õmøhU PõsP.
A person does 30 kJ work on 2 kg of water by stirring, using a paddle wheel. While stirring,
around 5 kcal of heat is released from water through its container to the surface and
surroundings by thermal conduction and radiation. Find the change in internal energy of
the system.

£S-v & 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. v¸¨¦ Âø\°ÚõÀ ö\´¯¨£mh ÷Áø»UPõÚ \©ß£õmøh Á¸ÂUPÄ®.
Derive an expression for the work done by torque.

26. E¯µzøu¨ ö£õ¸zx g GÆÁõÖ ©õÖ£k® Gߣøu ÂÍUSP.
Explain the variation of g with altitude.

27. }º©zvß £µ¨¦ CÊÂø\ø¯¨ £õvUS® PõµoPÒ ¯õøÁ ?
What are the factors affecting the surface tension of a liquid ?

A

9 7617

28. \µõ\› C¯UP BØÓÀ ©ØÖ® AÊzuzvØS® Cøh÷¯¯õÚ öuõhº¦ ¯õx ?

What is the relation between the average kinetic energy and pressure ?

29. vo¨¦ AvºÄ GßÓõÀ GßÚ ?

What is forced oscillation ?

30. AvºÄÖ® C¸ Cø\UPøÁPÒ ÷uõØÖÂUS® Aø»PÎß Aø»a \©ß£õkPÒ
y1=5 sin (240 πt) ©ØÖ® y2=4 sin (244 πt). ÷uõßÖ® ®©ÀPÎß GsoUøPø¯U
PnUQkP.

Two vibrating tuning forks produce waves whose equation is given by y1=5 sin (240 πt) and
y2=4 sin (244 πt). Compute the number of beats per second.

31. Ai¨£øh AÍÄPÒ ©ØÖ® ÁÈ AÍÄPÒ GßÓõÀ GßÚ ? GkzxUPõmkPÒ
u¸P.

What are fundamental and derived quantities ? Give examples.

32. BØÓÀ ©õÓõ Âvø¯U TÖP.

State the law of Conservation of energy.

33. GÔö£õ¸öÍõßÖ 308 GÔ÷PõnzvÀ GÔ¯¨£kQÓx. Auß Bµ®£z vø\÷ÁP®
5 ms−1 GÛÀ, GÔö£õ¸Ò Aøh¢u ö£¸© E¯µ® ©ØÖ® QøhzuÍ ö|kUPzøuU
PnUQkP.

An object is thrown with initial speed 5 ms−1 with an angle of projection 308. Calculate the
height and range reached by the particle.

A [ v¸¨¦P / Turn over

7617 10

£S-v & IV / PART - IV
SÔ¨¦ : AøÚz-x ÂÚõU-P-ÐU-S® Âøh-¯-ÎU-P-Ä®. 5x5=25
Note : Answer all the questions.
34. (A) AvºÁøh²® P®¤°ß AvºöÁs (γ) BÚx
(i) AÎUP¨£mh Âø\ (F)
(ii) }Í® (l)
(iii) Kµ»S }ÍzvØPõÚ {øÓ (m)
BQ¯ÁØøÓ¨ ö£õÖzux GÚU öPõshõÀ, £›©õn •øÓ¨£i

AvºöÁs γ ∝ 1 F
GÚ {¹¤UPÄ®.
l m

AÀ»x
(B) A•UP C¯»õu, £õS{ø»¯ØÓ £õ´©® JßÖ Á›a^º KmhzvÀ
ö\ÀÁuØPõÚ ö£ºöÚͼ°ß ÷uØÓzøuU TÔ, AuøÚ {¹¤UPÄ®.
(a) Assuming that the frequency γ of a vibrating string may depend upon.
(i) applied force (F)
(ii) length (l)
(iii) mass per unit length (m),

1 F
prove that γ ∝ using dimensional analysis.
l m

OR
(b) State and prove Bernoulli’s theorem for a flow of incompressible, non-viscous, and
streamlined flow of fluid.

35. (A) ÷Áø» BØÓÀ uzxÁzøuU TÔ ÂÍUSP. AuØS H÷uÝ® ‰ßÖ
Euõµn[PøÍU TÖP.
AÀ»x
(B) ö\¯ÀvÓß SnPzøu Áøµ¯ÖUPÄ®. Sκ£uÚ¨ö£mi JßÔß
ö\¯À£õmøh ›ÁõP ÂÍUSP.
(a) State and explain work energy principle. Mention any three examples for it.
OR
(b) Define coefficient of Performance. Explain in detail the working of a refrigerator.

A

11 7617

36. (A) ö©À¼¯ P®¤°ÚõÀ CønUP¨£mh PÚ¨ö£õ¸mPÎß ö\[Szx
C¯UPzøu ÂÁ›UPÄ®.
AÀ»x
(B) ÷PõÒPÎß C¯UPzvØPõÚ öP¨Í›ß ‰ßÖ ÂvPøÍU TÔ, ÂÍUSP.
(a) Explain the motion of blocks connected by a string in vertical motion.
OR
(b) State and explain Kepler’s three Laws of Planetary Motion.

37. (A) ©õÓõu •kUP® ö£ØÓ ö£õ¸Îß C¯UPa \©ß£õkPøÍ Á¸ÂUPÄ®.
AÀ»x
(B) Áõ²UPÎß \µõ\› ÷©õu¼øhz yµzvØPõÚ ÷PõøÁø¯ Á¸ÂUPÄ®.
(a) Derive the kinematic equations of motion for constant acceleration.
OR
(b) Derive the expression for mean free path of the gas.

38. (A) ^µõÚ Áøͯzvß ø©¯® ÁÈa ö\ÀÁx®, uÍzvØS ö\[SzuõÚx©õÚ
Aaø\¨ £ØÔ¯ {ø»©z v¸¨¦z vÓÝUPõÚ \©ß£õmøh Á¸ÂUPÄ®.
AÀ»x
(B) ‰i¯ BºPß SÇõ°À ÷©Ø_µ[PÒ HØ£kÁøu ÂÍUPÄ®.
(a) Derive the expression for moment of inertia of a uniform ring about an axis passing
through the centre and perpendicular to the plane.
OR
(b) Explain how overtones are produced in a closed organ pipe.

-o0o-

A [ v¸¨¦P / Turn over

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