TN 11th Question Paper 2023 Physics

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 8
6717
A £vÄ Gs
Register Number

!6717IstYearPhysics!
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

6717 2

1. £õQ¯À Gsoß £›©õn Áõ´¨£õk :
(A) ML−2T−2 (B) MLT−2 (C) ML−1T−2 (D) ML−1T−1
The dimensional formula for coefficient of viscosity is :
(a) ML−2T−2 (b) MLT−2 (c) ML−1T−2 (d) ML−1T−1

2. J¸ ö£õ¸Ò 20 « E¯µzv¼¸¢x R÷Ç ÂÊ®÷£õx A¨ö£õ¸ÍõÚx uøµø¯
Aøh¯ GkzxU öPõÒЮ Põ»® (PõØÖzuøhø¯¨ ¦ÓUPoUPÄ®. ÷©¾®
g=10 «Â−2)
(A) 2 Â (B) 1.732 Â (C) 1.532 Â (D) 1.414 Â
If an object is falling from a height of 20 m, then the time taken by the object to
reach the ground : (ignore air resistance and take g=10 ms−2)
(a) 2s (b) 1.732 s (c) 1.532 s (d) 1.414 s

3. Áõ² JßÔß öÁ¨£{ø» ©ØÖ® AÊzuzøu C¸©h[PõUS® ÷£õx, AÆÁõ²
‰»UTÖPÎß \µõ\› ÷©õu¼øhzyµ® :
(A) •®©h[PõS® (B) ©õÓõx
(C) |õßS ©h[PõS® (D) C¸©h[PõS®
If the temperature and pressure of a gas is doubled, the mean free path of the gas
molecules :
(a) tripled (b) remains same
(c) quadrupled (d) doubled

4. \õº»ì Âv°ß£i £¸©ß ©ØÖ® öÁ¨£{ø»US©õÚ Áøµ£h® :
(A) J¸ ÷|ºU÷Põk (B) J¸ }ÒÁmh®
(C) J¸ £µÁøͯ® (D) J¸ Ámh®
The graph between volume and temperature in Charle’s law is :
(a) a straight line (b) an ellipse
(c) a parabola (d) a circle

5. ¤ßÁ¸ÁÚÁØÖÒ G¢u C¯Ø¤¯À AÍøÁ ì÷P»µõÀ SÔ¨¤h C¯»õx ?
(A) E¢u® (B) {øÓ
(C) •kUPzvß Gs ©v¨¦ (D) }Í®
Which one of the following physical quantities cannot be represented by a scalar ?

(a) Momentum (b) Mass
(c) Magnitude of acceleration (d) Length

A

3 6717

6. 5000 Hz AvºöÁs Eøh¯ J¼ PõØÔÀ C¯[Q, }º £µ¨ø£ uõUSQÓx. }º,
PõØÔÀ Aø»}Í[PÎß uPÄ :
(A) 5.30 (B) 4.30 (C) 1.23 (D) 0.23
A sound wave whose frequency is 5000 Hz travels in air and then hits the water
surface. The ratio of its wavelengths in water and air is :
(a) 5.30 (b) 4.30 (c) 1.23 (d) 0.23

7. y=2 sin (20πt+1.5) GßÓ uÛa^›ø\ Aø»Äa \©ß£õmiß AvºöÁsoß
©v¨¦ :
(A) 10 Hz (B) 20 Hz (C) 15 Hz (D) π Hz
In the given SHM y=2 sin (20πt+1.5) the frequency of oscillation is :
(a) 10 Hz (b) 20 Hz (c) 15 Hz (d) π Hz

8. ^›ø\ C¯UPzøu ÷©ØöPõÒЮ xPÒ, A ©ØÖ® B GßÓ ¦ÒÎPøÍ J÷µ
vø\÷ÁPzxhß PhUQÓx. A &°¼¸¢x B &US ö\À» GkzxUöPõÒЮ ÷|µ®
3 s ©ØÖ® B &°¼¸¢x A &US ö\À» «sk® 3 s GkzxU öPõÒQÓx GÛÀ,
Auß Aø»Ä÷|µ® :
(A) 12 s (B) 15 s (C) 9 s (D) 6 s
A particle executing SHM crosses points A and B with the same velocity. Having
taken 3 s in passing from A to B, it returns from B to A after another 3 s. The
time period is :
(a) 12 s (b) 15 s (c) 9 s (d) 6 s

9. 10 ö\.« }Í® öPõsh ‰i¯ BºPß SÇõ°ß Ai¨£øh AvºöÁs :
(A) 4.5 vHz (B) 2.5 vHz (C) 10 vHz (D) 2 vHz
The fundamental frequency of closed organ pipe whose length is 10 cm is :
(a) 4.5 vHz (b) 2.5 vHz (c) 10 vHz (d) 2 vHz

10. (2 i + j ) N GßÓ ^µõÚ Âø\ 1 kg {øÓ²ÒÍ J¸ ö£õ¸Îß «x ö\¯À£kQÓx.
∧ ∧

ö£õ¸ÍõÚx ( 3 j + k ) m GßÓ {ø» •uÀ (5 i + 3 j ) m GßÓ {ø» Áøµ Ch®
∧ ∧ ∧ ∧

ö£¯¸QÓx. ö£õ¸Îß «x Âø\°ÚõÀ ö\´¯¨£mh ÷Áø» :
(A) 10 J (B) 9 J (C) 12 J (D) 6 J
A uniform force of (2 i + j ) N acts on a particle of mass 1 kg. The particle
∧ ∧

displaces from position ( 3 j + k ) m to ( 5 i + 3 j ) m. The workdone by the force on
∧ ∧ ∧ ∧

the particle is :
(a) 10 J (b) 9J (c) 12 J (d) 6J

A [ v¸¨¦P / Turn over

6717 4

11. vs©ö£õ¸Ò JßÖ ÷Põn E¢u® L Ehß _ÇÀQÓx. Cuß C¯UP BØÓÀ
£õv¯õÚõÀ ÷Põn E¢u©õÚx :
L
(A) 2L (B) L (C) 2
(D) L/2
A rigid body rotates with an angular momentum L. If its kinetic energy is halved,
the angular momentum becomes :

L
(a) 2L (b) L (c) (d) L/2
2

12. ø©¯Â»US Âø\ G[S HØ£k® ?
(A) G¢u J¸ •kUP©øh²® SÔ¨£õ¯zv¾®
(B) {ø»©U SÔ¨£õ¯[PÎÀ ©mk®
(C) {ø»©, {ø»©©ØÓ SÔ¨£õ¯[PÎÀ
(D) _ÇÀ C¯UP SÔ¨£õ¯[PÎÀ ©mk®
The centrifugal force appears to exist :
(a) in any accelerated frame
(b) only in inertial frames
(c) both in inertial and non-inertial frames
(d) only in rotating frames

13. ¦Â°øÚa _ØÖ® xønU÷PõÎß C¯UP BØÓÀ :
(A) {ø» BØÓø» Âh AvP® (B) {ø» BØÓ¾USa \©®
(C) _È (D) {ø» BØÓø»ÂhU SøÓÄ
The kinetic energy of the satellite orbiting around the earth is :
(a) greater than potential energy (b) equal to potential energy
(c) zero (d) less than potential energy

14. J¸ P®¤¯õÚx Auß öuõhUP }Ízøu¨÷£õ» C¸ ©h[S }mh¨£mhõÀ
P®¤°À HØ£mh v›¦ :
(A) 3 (B) 1 (C) 4 (D) 2
If a wire is stretched to double of its original length, then the strain in the wire

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

A

5 6717

15. 19.95 GßÓ Gsøn ‰ßÖ •UQ¯ Gsq¸ ÁiÂÀ •Êø©¨£kzxP.
(A) 20.1 (B) 19.9 (C) 19.5 (D) 20.0
Round off the number 19.95 into three significant figures.
(a) 20.1 (b) 19.9 (c) 19.5 (d) 20.0

£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. •UQ¯ Gsq¸UPøÍ PnUQkÁuß ÂvPøÍz u¸P.
Write the rules for determining significant figures.

17. ì÷P»õº – Áøµ¯ÖUPÄ®. GkzxUPõmkPÒ u¸P.
Define scalar. Give examples.

18. \› \©©õÚ ÁøÍÄa\õø»°À Põº JßÖ \ÖUSÁuØPõÚ {£¢uøÚ GßÚ ?
Under what condition will a car skid on a levelled circular road ?

19. BØÓÀ ©õØÓõ Âø\ ©ØÖ® BØÓÀ ©õØÖ® Âø\US Cøh÷¯²ÒÍ H÷uÝ®
Cµsk ÷ÁÖ£õkPøÍU TÖP.
Write any two differences between conservative and non-conservative Force.

20. v¸¨¦ Âø\ø¯ E¸ÁõUPõu Âø\PÐUPõÚ {£¢uøÚPÒ ¯õøÁ ?
What are the conditions in which Force cannot produce Torque ?

21. {³mhÛß ö£õx Dº¨¤¯À Âvø¯U TÖP.
State Newton’s Universal Law of Gravitation.

22. £õ´éß ÂQuzøu Áøµ¯ÖUPÄ®.
Define Poisson’s ratio.

23. öÁ¨£ C¯UP¯¼ß _È Âvø¯U TÖP.
State Zeroth Law of Thermodynamics.

A [ v¸¨¦P / Turn over

6717 6

24. 3 kg ©ØÖ® 6 kg {øÓ öPõsh C¸ ö£õ¸ÒPÒ 30 kgms−1 GßÓ \© E¢uzxhß
C¯[SQßÓÚ. AøÁ \© C¯UP BØÓø»¨ ö£ØÔ¸US©õ ?
Two objects of masses 3 kg and 6 kg are moving with the same momentum of
30 kgms−1. Will they have same kinetic energy ?

£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. ö©õzu¨ ¤øÇPÒ GßÓõÀ GßÚ ? A¨¤øÇ HØ£h Põµn[PøͲ®, AuøÚ
GÆÁõÖ SøÓUP»õ® Gߣøu²® TÖP.
What is Gross Error ? State the reasons for it and how to minimise the errors.

26. Cµsk öÁUhºPÎß ì÷P»õº ö£¸UPÀ £s¦PøÍ ÂÁ›UPÄ®.
Write the properties of scalar product of two vectors.

27. ø©¯÷|õUS Âø\ ©ØÖ® ø©¯Â»US Âø\US Cøh÷¯²ÒÍ ÷ÁÖ£õkPøÍU
TÖP.
State the differences between centripetal force and centrifugal force.

28. £À÷ÁÖ ÁøP¯õÚ {ø» BØÓø»U TÖP. Auß \©ß£õkPøÍ ÂÍUSP.
State the various types of potential energy. Explain its formulae.

29. ¦Â{ø» xønU÷PõÒPÒ & ÂÍUSP.
Explain geostationary satellites.

30. ~s¦øÇ ~øÇÂß ö\¯À•øÓ £¯ß£õkPøÍU TÖP.
Write the practical applications of capillarity.

31. uÛ F\¼ß ÂvPøÍz u¸P.
State the Laws of Simple Pendulum.

32. Áõ²UPÎß C¯UPÂ¯Ø öPõÒøPUPõÚ Gk÷PõÒPøÍ GkzöuÊxP.

Write down the postulates of kinetic theory of gases.

A

7 6717

33. J¸ öÁ¨£ C¯¢vµ® Auß _ÇØ] {PÌÂß ÷£õx 600 J öÁ¨£zøu öÁ¨£
‰»zv¼¸¢x ö£ØÖUöPõsk J¸ SÔ¨¤mh ÷Áø»ø¯ ö\´u ¤ßÚº 200 J
öÁ¨£zøu `ǾUS (öÁ¨£ HؤUS) öPõkUQÓx. C¢{£¢uøÚPÎߣi A¢u
öÁ¨£ C¯¢vµzvß £¯ÝÖ vÓøÚU PõsP.
During a cyclic process, a heat engine absorbs 600 J of heat from a hot reservoir,
does work and ejects an amount of heat 200 J into the surroundings (cold reservoir).
Calculate the efficiency of the heat engine.

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25
Note : Answer all the questions.
34. (A) uÛ F\¼ß Aø»Ä ÷|µzvØPõÚ (T) ÷PõøÁø¯ £›©õn •øÓ°À ö£ÖP.
Aø»Ä ÷|µ©õÚx
(i) F\À Ssiß {øÓ 'm'
(ii) F\¼ß }Í® 'l'
( iii) AÆÂhzvÀ ¦Â±º¨¦ •kUP® ‘g’ BQ¯ÁØøÓa \õº¢ux
(©õÔ¼ k=2π)
AÀ»x
(B) öÁUhº Tku¼ß •U÷Põn Âvø¯ ›ÁõP ÂÍUPÄ®.
(a) Obtain an expression for the time period T of a simple pendulum. The time
period depends on :
(i) mass ‘m’ of the bob
(ii) length ‘l’ of the pendulum and
(iii) acceleration due to gravity ‘g’ at the place where the pendulum is
suspended. (Constant k=2π)
OR
(b) Explain in detail the Triangle Law of Vector Addition.

35. (A) \õ´uÍ® JßÔÀ Eµõ´ÄU÷Põn®, \ÖUSU ÷PõnzvØSa \©® GÚU PõmkP.
AÀ»x
(B) vÓß ©ØÖ® vø\÷ÁPzvØPõÚ ÷PõøÁø¯z u¸ÂUPÄ®.
(a) Show that in an inclined plane, angle of friction is equal to angle of repose.
OR

(b) Derive an expression for power and velocity.

A [ v¸¨¦P / Turn over

6717 8

36. (A) usk JßÔß {ø»©z v¸¨¦zvÓøÚ Auß ø©¯® ÁȯõPÄ®, usiØS
ö\[SzuõPÄ® ö\À¾® Aaø\¨ ö£õ¸zux©õÚ \©ß£õmøh ö£ÖP.
AÀ»x
(B) ¦Â°ß BÇzøu¨ ö£õÖzx Dº¨¤ß •kUP® (g) GÆÁõÖ ©õÖ£k®
Gߣøu ÂÍUSP.
(a) Derive the expression for moment of inertia of a rod about its centre and
perpendicular to the rod.
OR
(b) Explain the variation of Acceleration due to gravity (g) with depth from the
earth’s surface.

37. (A) ì÷hõU Âvø¯¨ £¯ß£kzv AvP £õS{ø» öPõsh vµÁzvÀ C¯[S®
÷PõÍzvß •ØÖz vø\÷ÁPzvØPõÚ \©ß£õmøhz u¸ÂUPÄ®.
AÀ»x
(B) |À¼¯À¦ Áõ² JßÔØPõÚ ÷©¯º öuõhºø£¨ ö£ÖP.
(a) Derive the expression for the terminal velocity of a sphere moving in a high
viscous fluid using Stoke’s law.
OR
(b) Derive Meyer’s relation for an ideal gas.

38. (A) Áõ² ‰»UTÖPÒ, AÁØøÓ Aøhzx øÁUP¨£mi¸US® öPõÒP»Ûß
_Á›ß «x HØ£kzx® AÊzuzvØPõÚ ÷PõøÁø¯¨ ö£ÖP.
AÀ»x
(B) PõØÔÀ, J¼°ß vø\÷ÁPzvØPõÚ {³mhß \©ß£õmøh¨ ö£ÖP. AvÀ
»õ¨»êß v¸zuzøu ÂÁ›UPÄ®.
(a) Derive the expression of pressure exerted by the gas molecules on the walls
of the container.
OR
(b) Derive Newton’s formula for velocity of sound waves in air. Explain the
Laplace’s correction in it.

-o0o-

A