TN 12th Question Paper 2025 Basic Electronics Engineering

TAMIL NADU

uest
Q apeion
P r
DOWNLOAD

No. of Printed Pages : 7
8378
!8378BasicElectronicsEngg! £vÄ Gs
Register Number

Part III — Vocational Subjects
Ai¨£øh ªßÚq ö£õÔ°¯À
BASIC ELECTRONICS ENGINEERING
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 90
Time Allowed : 3.00 Hours ] [ Maximum Marks : 90

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£v¨¤À SøÓ°¸¨¤ß AøÓU PsPõo¨£õÍ›h®
EhÚi¯õP 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

8378 2

1. ¤ß-Á-¸® Áõ-°À-P-ÎÀ Gx Ai¨-£øh Áõ-°À ?
(A) AND Gate (B) NAND Gate (C) EX-OR Gate (D) NOR Gate
From the following Gate which one is basic Gate ?
(a) AND Gate (b) NAND Gate (c) EX-OR Gate (d) NOR Gate

2. AM Áõ-öÚõ¼ £µ¨-¤-°ß £møh AP-»® __________.
(A) 200 kHz (B) 100 kHz (C) 540 kHz (D) 10 kHz
The bandwidth of AM radio transmitter is __________.
(a) 200 kHz (b) 100 kHz (c) 540 kHz (d) 10 kHz

3. AM Áõ-öÚõ¼ HØ-¤-°ß Cøh-{-ø» Avº-öÁs __________.
(A) 88 MHz (B) 100 kHz (C) 455 kHz (D) 10.7 kHz
Intermediate frequency of AM radio receiver is __________.
(a) 88 MHz (b) 100 kHz (c) 455 kHz (d) 10.7 kHz

4. |øh-÷£] __________ yµ® Áøµ ö\¯À-£-k®.
(A) 18 Q÷»õ«m-hº (B) 27.2 Q÷»õ«m-hº
(C) 15 Q÷»õ«m-hº (D) 58 Q÷»õ«m-hº
Walkie-talkie works upto __________.
(a) 18 kilometers (b) 27.2 kilometers
(c) 15 kilometers (d) 58 kilometers

5. A¸-P-ø»US (Wi-Fi) ö£õ-x-ÁõP __________ £møh £¯ß-£-k-Q-Óx.
(A) SHF (B) UHF
(C) UHF ©Ø-Ö® SHF (D) VHF
Wi-Fi most commonly uses __________ band.
(a) SHF (b) UHF
(c) UHF and SHF (d) VHF

6. ~s-n-ø»z v¸¨-¤-PÍõP ö\¯À-£-k-Áx __________.
(A) Bs-öh-Úõ (B) ö£¸U-Q
(C) ÷\õÚõº (D) ö\¯Ø-øPU ÷PõÒ
__________ works as microwave repeater.
(a) Antenna (b) Amplifier
(c) SONAR (d) Satellite

3 8378

7. __________ J¸ ¤®- £ z- ø u ÷\ªU- P z ÷uøÁ- ¯ õÚ ÷\ª¨- £ - P zøu SøÓU- S ®
~m-£z-øuU øP¯õÒ-Q-Óx.
(A) ¤®£ _¸U-P® (B) ¤®-£zøu ÷©®-£-kz-x-uÀ
(C) ¤®-£z-øuU øP¯-P¨-£-kz-x-uÀ (D) ¤®£ ©Ö-^-µ-ø©¨-¦
__________ deals with technique reducing the storage required to save an image.
(a) Image Compression (b) Image Enhancement
(c) Image Acquisition (d) Image Restoration

8. J¼-¯-ø»-PÒ £¯-o¨-£x __________.
(A) öÁÆ-÷ÁÖ ÷ÁPz-vÀ öÁÆ-÷Á-Ö Fh-Pz-vÀ
(B) J÷µ ÷ÁPz-vÀ öÁÆ-÷ÁÖ Fh-Pz-vÀ
(C) öÁØ-Ô-hz-vÀ ªP E¯º¢u ÷ÁPz-vÀ
(D) öÁÆ-÷ÁÖ ÷ÁPz-vÀ J÷µ Fh-Pz-vÀ
Sound waves travel at __________.
(a) Different speed in different mediums
(b) Same speed in different mediums
(c) Highest speed in vacuum
(d) Different speed in same mediums

9. __________ Gß-£x J¼ BØ-Ó-¼ß A»-S BS®.
(A) «m-hº (B) K®ì (C) öh]-£À (D) öíºmì
The unit of sound energy is __________.
(a) Meter (b) Ohms (c) Decibel (d) Hertz

10. Aø»-÷£-]-°À £¯ß-£-k® vÓß ©õØÔ __________ ÁøP-ø¯ \õº¢-ux.
(A) DC to DC ^µõU-Q (B) AC to AC ^µõU-Q
(C) AC to DC v¸zv (D) DC to AC ¦µm-i
__________ type of power electronics is used in cell phone.
(a) DC to DC regulator (b) AC to AC regulator
(c) AC to DC rectifier (d) DC to AC inverter

11. Cµzu AÊz-uzøu AÍ-Â-h¨ £¯ß-£-kz-x® P¸- :
(A) PõØ-Ó-Êz-u-©õ-Û (B) ©õ-÷Úõ«m-hº
(C) öÁ¨-£-©õÛ (D) ìø£U-÷©õ-©õ-÷Úõ«m-hº
The instrument used to measure Blood Pressure is __________.
(a) Barometer (b) Manometer
(c) Thermometer (d) Sphygmomanometer

[ v¸¨¦P / Turn over

8378 4

12. ©õ-µ-øh¨-ø£U Ps-h-Ô¯ Eu-Ä® ©¸z-xÁ \õ-u-Ú® :
(A) PõØ-Ó-Êz-u-©õ-Û (B) ECG
(C) öÁ¨-£-©õÛ (D) SÐU-÷Põ«m-hº
The medical instrument used to find Ischemia __________.
(a) Barometer (b) ECG
(c) Thermometer (d) Glucometer

13. ¤ß-Á-¸-Á-Ú-ÁØ-ÔÀ Gx PoÛ Áß-ö£õ-¸Ò P¸- BS® ?
(A) Gvº |a-_ (B) _¸Ò-Â
(C) C¯UP •øÓø© (OS) (D) \õ-uÚ C¯U-Q-PÒ
Which of the following is computer hardware tool ?
(a) Antivirus (b) Crimpers
(c) Operating System (OS) (d) Device drivers

14. EÒ-~-øÇ-²® ]U-P-¾U-PõÚ Põ-µ-n® GßÚ ?
(A) Cøn-¯ ö\¯-¼-Ǩ-¦ (B) ö©ß-ö£õ-¸Ò ¦x¨-¤z-uÀ
(C) £õ-x-Põ¨¦ uõU-S-uÀ (D) Áß-ö£õ-¸Ò ¦x¨-¤z-uÀ
What can be the cause for login issue ?
(a) Internet failure (b) Software update
(c) Security attack (d) Hardware update

15. DNS &ß Â-›-ÁõU-P® __________.
(A) Domain Name Server (B) Domain Network Server
(C) Domain Name System (D) Digital Network Server
DNS stands for __________.
(a) Domain Name Server (b) Domain Network Server
(c) Domain Name System (d) Digital Network Server

£Sv & II / PART - II
SÔ¨¦ : GøÁ÷¯Ý® £z-x Â-ÚõU-P-ÐUS Âøh¯-ÎU-P-Ä®. AÁØ-ÔÀ ÂÚõ Gs
28 &US Pmhõ¯©õP Âøh-¯-Îz-uÀ ÷Ás-k®. 10x3=30
Note : Answer any ten of the following questions. Question No. 28 is compulsory.

16. AND Áõ-°-¼ß Aø©¨-¤øÚ Áøµ¢x Esø© Am-h-Á-ønø¯ GÊ-xP.
Draw the construction of AND gate with truth table.

17. J¨-¦-ø©¨ £s-÷£Ø-Ó® ÁøP-P-øÍU TÖ-P.
State the types of analog modulation.

5 8378

18. Aø»-÷£-] C¯UP •øÓø© £ØÔ _¸U-P-©õP GÊ-u-Ä®.
Write short notes on mobile phone operating system.

19. ÷|µ-i Á›-ø\ £µ-Ä-uÀ&Aø»U-PØøÓ (DS-SS) Gß-£x GßÚ ?
What is Direct Sequence Spread Spectrum ?

20. ÷µhõº Gß-ÓõÀ GßÚ ?
What is RADAR ?

21. ¤®-£zøu ÷©®-£-kz-x-uÀ Gß-ÓõÀ GßÚ ?
What is Image Enhancement ?

22. C»U-P-ÁøP ¤®-£a ö\¯-»õU-P® Gß-ÓõÀ GßÚ ?
What is the Digital Image Processing ?

23. J¼ Gß-£x GßÚ ? GÆ-ÁõÖ E¸-ÁõU-P¨-£-k-Q-Óx ?
What is sound ? How is it produced ?

24. UPS Gß-£-uß ÷|õU-P® GßÚ ?
What is the purpose of UPS ?

25. E°º-©-¸z-xÁ P¸-Â-°ß Ai¨-£-øhU TÖ-P-Îß £h® ÁøµP.
Draw the basic component of a biomedical instrument.

26. Hß CMOS Ga- \ - › UøP ö\´v vøµ- ° À ÷uõß- Ö - Q - Ó x ? }[- P Ò GÆ- Á õÖ
Gvº-Â-øÚ¯õØ-Ö-ú-PÒ ?
Why CMOS alert message is showing up on our screen ? How will you react ?

27. Áø»-¯-ø©¨¦ C¯U-P-•-øÓø© öuõ-hº-£õÚ ]U-PÀ-PÒ ]»-ÁØ-øÓ¨ £m-i-¯-¼-h-Ä®.
List some of the problems related with network operating system.

28. «~s ö\¯Ø-øPU÷PõÒ-PÒ £ØÔ GÊ-u-Ä®.
Write about Nano satellite.

[ v¸¨¦P / Turn over

8378 6

£Sv & III / PART - III
SÔ¨¦ : GøÁ÷¯Ý® I¢-x Â-ÚõU-P-ÐUS Âøh¯-ÎU-P-Ä®. AÁØ-ÔÀ ÂÚõ Gs
35 &US Pmhõ¯©õP Âøh- ¯ - Î z- u À ÷Ás- k ®. ÷uøÁ- ¯ õÚ Ch[- P - Î À
£h[-PÒ Áøµ-P. 5x5=25

Note : Answer any five questions. Question No. 35 is compulsory. Draw diagrams wherever
necessary.

29. uºUP Áõ-°À-P-ÎÀ PÈz-uÀ •øÓ-ø¯a ö\¯À-£-kzu •i-²-©õ ? _Ø-Ö¨-£-h® ©Ø-Ö®
Esø© Am-h-Áøn ‰»® {¹¤.
Is it possible to perform subtraction in logic gates ? Prove with circuit and truth table.

30. JÎ CøÇU-P®¤ ö\¯À-£-k® Âu® £ØÔ GÊ-u-Ä®.
Write about the working principle of an OFC.

31. -ö£õ-¸Ò Aøh-¯õÍ® Põ-nÀ £ØÔ Â›-ÁõP ÂÍU-S-P.
Explain in detail about the object recognition.

32. A¸-P-ø» (Wi-Fi) £ØÔ _¸U-P-©õP GÊ-u-Ä®.
Write short notes on Wi-Fi.

33. J¸ ªß Cu- ¯ - Á - ø µÂ ö\¯À- £ õm- i ß öPõÒ- ø Pø¯ £hz- x - h ß _¸U- P - © õP
ÂÍU-P-Ä®.
Briefly explain the principle of operation of an Electrocardiograph with a neat sketch.

34. Hß PoÛ £µõ-©-›¨¦ Az-v-¯õ-Á-]-¯-©õ-Úx ?
Why computer maintenance is essential ?

35. SMPS&ß Pm-h¨-£-h® Áøµ-P.

Draw the block diagram of SMPS.

7 8378

£Sv & IV / PART - IV
SÔ¨¦ : A- ø Úz- x ÂÚõU- P - Ð U- S ® Âøh¯- Î U- P - Ä ®. ÷uøÁ- ¯ õÚ Ch[- P - Î À
£h® Áøµ-P. 2x10=20
Note : Answer all the questions. Draw diagrams wherever necessary.

36. (A) Cøn¢u Áõ- ° À- P - Î ß ö\¯À- £ õmøh Esø© Am- h - Á - ø n- ² - h ß
ÂÁ-›U-P-Ä®.
AÀ»x
(B) Avº-öÁs £s÷£ØÓ Áõ-öÚõ¼ HØ-¤-°ß Pm-h¨-£-h® Áøµ¢x ÂÁ-›U-P-Ä®.
(a) Explain the working of combinational logic gates with truth table.
OR
(b) Explain the block diagram of FM radio receiver.

37. (A) UPS &ß _ØÖ £h® Áøµ¢x ÷Áø» ö\´-²® Âuzøu ÂÁ-›U-P-Ä®.
AÀ»x
(B) TDA 2030 IC &ø¯ £¯ß-£-kzv ÷PöÍõ¼ vÓß ö£¸U-Q-°ß Pm-h-ø©¨¦
©ØÖ® ÷Áø» ö\´-²® ö\¯À-£õmøh ÷|ºz-v-¯õÚ Áøµ-£-hz-x-hß ÂÍU-
PÄ®.
(a) Draw the circuit diagram of UPS and explain its working.
OR
(b) Explain the construction and working function of an audio power amplifier using
TDA 2030 IC with a neat diagram.

-o0o-

[ v¸¨¦P / Turn over

Study Materials
Notes

Model Papers Class 6 Notes

Sample Papers Class 7 Notes
Half Yearly Sample Papers Class 8 Notes

Class 9 Notes
Important Resources
Class 10 Notes
Periodic Table
Class 11 Notes
Writing Skills / Formats

Maps of India / World Class 12 Notes

Books and Solutions

NCERT Books
NCERT Book Solutions
HC Verma Chapter Wise Solutions
RD Sharma Solutions
CGBSE Solutions