Tamil Nadu 10th Std Model Question Paper 2026 Science

Tamil Nadu Board Model Question Paper

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Part - III
AÔ¯À / SCIENCE
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version)

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 75
Time Allowed : 3.00 Hours ] [ Maximum Marks : 75

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP Aa_¨ £vÁõQ EÒÍuõ GߣuøÚ
\›£õºzxU öPõÒÍÄ®. Aa_¨£vÂÀ SøÓ°¸¨¤ß AøÓU
PsPõo¨£õÍ›h® EhÚi¯õP öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ 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.

SÔ¨¦ : CÆÂÚõzuõÒ |õßS £SvPøÍU öPõshx.
Note : This question paper contains four parts.

£Sv & I / PART - I

SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 12x1=12
(ii) öPõkUP¨£mkÒÍ |õßS ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯
Âøh°øÚz ÷uº¢öukzx 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.

8519 2

1. J¸ Q÷»õQµõ® Âø\ Gߣx __________ ØS \©©õS®.

(A) 9.8 øhß (B) 9.8×104 N

(C) 98×104 øhß (D) 980 øhß
One kilogram force equals to :

(a) 9.8 dyne (b) 9.8×104 N

(c) 98×104 dyne (d) 980 dyne

2. ÂÈ HØ£ø©Äz vÓß SøÓ£õmøha \› ö\´¯ EuÄÁx :

(A) SÂö»ß_ (B) SÈö»ß_

(C) SÂBi (D) C¸ S¯ ö»ß_
The eye defect ‘Presbyopia’ can be corrected by :

(a) convex lens (b) concave lens

(c) convex mirror (d) bifocal lens

3. 10 T¾® ªßÞmhzøu J¸ ªß_ØÔ¾ÒÍ Cµsk ¦ÒÎPÐUQøh÷¯ |Pºzu
ö\´¯¨£k® ÷Áø» 100 J GÛÀ A¨¦ÒÎPÐUQøh÷¯ EÒÍ ªßÚÊzu
÷ÁÖ£õk GßÚ ?

(A) 0.1 ÷ÁõÀm (B) 10 ÷ÁõÀm

(C) 100 ÷ÁõÀm (D) 1000 ÷ÁõÀm
The work done in moving a charge of 10 C across two points in a circuit is 100 J. What is the
potential difference between the points ?

(a) 0.1 V (b) 10 V

(c) 100 V (d) 1000 V

3 8519

4. ö\¯ØøP Pv›¯UPzvøÚU PshÔ¢uÁº :
(A) ö£UöPõµÀ (B) I›ß Q³›
(C) µõsmáß (D) }Àì ÷£õº
Artificial radioactivity was discovered by :

(a) Becquerel (b) Irene Curie

(c) Roentgen (d) Neils Bohr

5. Cµ\UP»øÁ E¸ÁõUP¼À ÷uøÁ¨£k® •UQ¯©õÚ E÷»õP® __________.
(A) Ag (B) Hg (C) Mg (D) Al
___________ is an important metal to form amalgam.

(a) Ag (b) Hg (c) Mg (d) Al

6. SÔ¨¤mh öÁ¨£{ø»°À, AÊzuzøu AvP›US®÷£õx }º©zvÀ Áõ²Âß
PøµvÓß __________.
(A) ©õØÓªÀø» (B) AvP›UQÓx
(C) SøÓQÓx (D) ÂøÚ CÀø»
When the pressure is increased at constant temperature, the solubility of gases in liquid
__________.

(a) no change (b) increases

(c) decreases (d) no reaction

7. J¸ Pøµ\¼ß pH ©v¨¦ 3 GÛÀ, Auß [OH−] ö\ÔÄ GßÚ ?
(A) 1×10−3 M (B) 3 M (C) 1×10−11 M (D) 11 M
The pH of a solution is 3. Its [OH−] concentration is :

(a) 1×10−3 M (b) 3M (c) 1×10−11 M (d) 11 M

8519 4

8. C2H5OH + 3O2 → 2CO2 + 3H2O Gߣx :

(A) GzuÚõÀ JkUP®
(B) GzuÚõÀ G›uÀ
(C) GzuÚõ°U Aª»® BU]á÷ÚØÓ®
(D) Gzu÷ÚÀ BU]á÷ÚØÓ®
C2H5OH + 3O2 → 2CO2 + 3H2O is :

(a) Reduction of ethanol

(b) Combustion of ethanol

(c) Oxidation of ethanoic acid

(d) Oxidation of ethanal

9. Põì÷£›¯ß £møhPÒ ÷Á›ß __________ £Sv°À Põn¨£kQÓx.
(A) ¦Óo (B) ¤z
(C) ö£›ø\UQÒ (D) APz÷uõÀ
Casparian strips are present in the __________ of the root.

(a) cortex (b) pith

(c) pericycle (d) endodermis

10. __________ ÁøP S÷µõ÷©õ÷\õªÀ ö\ßm÷µõª¯º ø©¯zvÀ Põn¨£kQÓx.

(A) j÷»õö\ßm›U (B) ö©mhõö\ßm›U
(C) \¨&ö©mhõö\ßm›U (D) AU÷µõö\ßm›U
The centromere is found at the centre of the ___________ chromosome.

(a) Telocentric (b) Metacentric

(c) Sub-metacentric (d) Acrocentric

5 8519

11. E»P G´mì vÚ® :
(A) i\®£º 1 (B) ÷© 31
(C) H¨µÀ 22 (D) AU÷hõ£º 2
World AIDS Day :

(a) December 1 (b) May 31

(c) April 22 (d) October 2

12. Aø\Åmk® PõönõÎPøÍ E¸ÁõUP £¯ß£k® ö©ßö£õ¸Ò Gx ?
(A) Paint (B) PDF
(C) MS Word (D) Scratch
Which software is used to create animation ?

(a) Paint (b) PDF

(c) MS Word (d) Scratch

£Sv & II / PART - II

SÔ¨¦ : GøÁ- ÷ ¯Ý® HÊ ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 22 &US
Pm-hõ-¯-©õP Âøh-¯-ÎU-PÄ®. 7x2=14

Note : Answer any seven questions. Question No. 22 is compulsory.

13. J¸ P÷»õ› & Áøµ¯Ö.
Define one Calorie.

14. ö|mhø» GßÓõÀ GßÚ ?
What is a longitudinal wave ?

8519 6

15. C¸®¦ x¸¤izu¾UPõÚ C¸ Põµn[PøÍz u¸P.

State two conditions necessary for rusting of iron.

16. ö£õ¸zxP.

1. ÂøÚa ö\¯À öuõSv -OH (i) ö£ß^ß

2. £À¼Ú Áøͯa ÷\º©[PÒ (ii) ö£õmhõ]¯® ìi¯÷µm

3. {øÓÄÓõ ÷\º©[PÒ (iii) BÀPíõÀ

4. ÷\õ¨¦ (iv) ¤³µõß

5. Põº÷£õ Áøͯa ÷\º©[PÒ (v) Dzwß

Match the following :

1. Functional group -OH (i) Benzene

2. Heterocyclic compounds (ii) Potassium Stearate

3. Unsaturated compounds (iii) Alcohol

4. Soap (iv) Furan

5. Carbocyclic compounds (v) Ethene

17. Cu¯ ÁõÀÄPÎß •UQ¯zxÁ® GßÚ ?

What is the importance of valves in the heart ?

18. ""÷£õÀi['' GßÓõÀ GßÚ ? Aøu G¨£i ö\¯ØøP¯õP FUSÂUP»õ® ?

What is Bolting ? How can it be induced artificially ?

7 8519

19. öPõkUP¨£mkÒÍ £hzvÀ A, B, C, D BQ¯ £õP[PøÍ Aøh¯õÍ® PõnÄ®.

Identify the parts A, B, C and D in the given figure.

20. Q £ÓøÁ°ß ]øuÁøh¢u CÓUøPPÒ, J¸ ö£Ó¨£mh £s¦. Hß Ax
ö£Ó¨£mh £s¦ GÚ AøÇUP¨£kQÓx ?

The degenerated wing of a Kiwi is an acquired character. Why is it called an acquired
character ?

21. ©µ[PÒ öÁmh¨£kÁuõÀ EshõS® ÂøÍÄPÒ ¯õøÁ ?

What will happen if trees are cut down ?

22. «z÷uÛÀ EÒÍ uÛ©[PÎß \uÃu Cø¯ø£ PõsP.

Find the mass percentage composition of methane (CH4).

8519 8

£Sv & III / PART - III

SÔ¨¦ : HøÁ- ÷ ¯Ý® HÊ ÂÚõU- P - Ð US Âøh- ¯ - Î U- P - Ä ®. ÂÚõ Gs 32 &US
Pm-hõ-¯©õ-P Âøh-¯-ÎU-P-Ä®. 7x4=28

Note : Answer any seven questions. Question No. 32 is compulsory.

23. |À¼¯À¦ Áõ² \©ß£õmiøÚ u¸Â.

Derive the ideal gas equation.

24. Qmh¨£õºøÁ ©ØÖ® yµ¨£õºøÁ SøÓ£õkPøÍ ÷ÁÖ£kzxP.
Differentiate the eye defects : Myopia and Hypermetropia.

25. BÀ£õ, ¥mhõ ©ØÖ® Põ©õU PvºPÎß £s¦PøÍ J¨¤kP.
Compare the properties of alpha, beta and gamma radiations.

26. AÁPõm÷µõ Âv°ß £¯ß£õkPøÍ GÊxP.
Write the applications of Avogadro’s Law.

27. (i) E÷»õPU P»øÁ GßÓõÀ GßÚ ?

(ii) E÷»õPU P»øÁ E¸ÁõUSÁuØPõÚ Põµn[PøÍU TÖP.
(i) What is an alloy ?

(ii) State the reasons for alloying.

28. ÷\õ¨¤ß y´ø©¯õUPÀ •øÓø¯ ÂÍUSP.
Explain the mechanism of cleansing action of soap.

9 8519

29. Amøh°À |øhö£Ö® Ch¨ö£¯ºa] {PÌa]°ß £i{ø»PøÍ GÊxP.

How does locomotion take place in leech ?

30. {³µõÛß Aø©¨ø£ £hzxhß ÂÁ›UPÄ®.

With a neat labelled diagram, explain the structure of a neuron.

31. (i) ©sn›¨¤ÚõÀ EshõPUTi¯ ÂøÍÄPÒ ¯õøÁ ?

(ii) ©sn›¨ø£ }º GÆÁõÖ uk¨¥º ?

(i) What are the consequences of soil erosion ?

(ii) How will you prevent soil erosion ?

32. 90 Hz AvºöÁsøn Eøh¯ J¼ ‰»©õÚx J¼°ß vø\÷ÁPzvÀ (1/10)
©h[S ÷ÁPzvÀ K´Ä {ø»°À EÒÍ ÷PmS|øµ AøhQÓx. ÷PmS|µõÀ
Enµ¨£k® AvºöÁs GßÚ ?

A source producing a sound of frequency 90 Hz is approaching a stationary listener with a
speed equal to (1/10) of the speed of sound. What will be the frequency heard by the
listener ?

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõU-P-ÐU-S® Âøh-¯-ÎU-P-Ä®. ÷uøÁ¯õÚ Ch[PÎÀ £h®
Áøµ¯Ä®. 3x7=21

Note : Answer all the questions. Draw diagrams wherever necessary.

33. (A) (i) E¢u ©õÓõU ÷Põm£õmøhU TÔ AuøÚ ö©´¨¤UP.
(ii) v¸¨¦zvÓß uzxÁ® Áøµ¯Ö.
AÀ»x

8519 10

(B) (i) ªß÷Úõmh® GßÓõÀ GßÚ ?

(ii) ªß÷Úõmhzvß A»øPU TÔ, AuøÚ Áøµ¯ÖUPÄ®.

(iii) ªß÷Úõmhzøu G¢u P¸Â°ß ‰»® AÍÂh •i²® ? AuøÚ J¸
ªß_ØÔÀ GÆÁõÖ CønUP¨£h ÷Ásk® ?
(a) (i) State and prove the law of conservation of linear momentum.

(ii) State the principle of moments.

OR

(b) (i) What is meant by electric current ?

(ii) Name and define its unit.

(iii) Which instrument is used to measure the electric current ? How should it be
connected in a circuit ?

34. (A) -(i) Dµ® EÔg_® ÷\º©[PÐUS®, Dµ® EÔg] Pøµ²® ÷\º©[PÐUS®
Cøh÷¯¯õÚ ÷ÁÖ£õkPÒ ¯õøÁ ?

(ii) Sκ ¤µ÷u\[PÎÀ }ºÁõÌ E°›Ú[PÒ AvP® ÁõÌQßÓÚ. Hß ?

(iii) PÚ AÍÄ \uÃu® Áøµ¯ÖUPÄ®.
AÀ»x
(B) (i) «ÒÂøÚ ©ØÖ® «ÍõÂøÚ ÷ÁÖ£kzxP.

(ii) ‘A’ GßÓ vs©a ÷\º©zøu öÁ¨£¨£kzx® ö£õÊx ]øu¢x ‘B’ ©ØÖ®
‘C’ GßÓ Áõ²øÁz u¸QÓx. ‘C’ GßÓ Áõ²øÁ }›À ö\¾zx®÷£õx
Aª»z ußø©¯õP ©õÖQÓx GÛÀ, A, B ©ØÖ® ‘C’ &ø¯U PshÔP.
(a) (i) In what way hygroscopic substances differ from deliquescent substances ?

(ii) The acquatic animals live more in cold region. Why ?

(iii) Define volume percentage.

OR

11 8519

(b) (i) Differentiate reversible and irreversible reactions.

(ii) A solid compound ‘A’ on heating decomposes into gas ‘B’ and ‘C’. On passing
the gas ‘C’ through water, it becomes acidic. Identify A, B and C.

35. (A) -÷ÁÖ£õk u¸P.

(i) J¸ Âøu°ø»z uõÁµ ÷Áº ©ØÖ® C¸ Âøu°ø»z uõÁµ ÷Áº.

(ii) PõØÖÒÍ _Áõ\® ©ØÖ® PõØÔÀ»õ _Áõ\®.
AÀ»x

(B) (i) S÷µõ÷©õ÷\õªß Aø©¨ø£ ÂÁ›UPÄ®.

(ii) ÷ÁÖ£kzxP :

EhÀ ö\À ãß ]Qaø\ ©ØÖ® CÚaö\À ãß ]Qaø\.

(a) Differentiate the following :

(i) Monocot root and Dicot root

(ii) Aerobic and Anaerobic respiration

OR

(b) (i) Explain the structure of a chromosome.

(ii) Distinguish between somatic gene therapy and germ line gene therapy.

-oOo-