CBSE Class 12 Electronics Technology Question Paper 2020

SET-4
Series HMJ H$moS> Z§.
Code No. 344
amob Z§. narjmWu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wI-n¥ð
Roll No. >na Adí` {bIo§ &
Candidates must write the Code on the
title page of the answer-book.

ZmoQ> NOTE
(I) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV (I) Please check that this question
n¥ð> 11 h¢ & paper contains 11 printed pages.

(II) àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE H$moS (II) Code number given on the right
>Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wI-n¥ð> na hand side of the question paper
{bI| & should be written on the title page of
the answer-book by the candidate.
(III) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| (III) Please check that this question
>42 àíZ h¢ & paper contains 42 questions.
(IV) H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go (IV) Please write down the Serial
nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$ Number of the question in the
Adí` {bI| & answer-book before attempting it.
(V) Bg àíZ-nÌ H$mo n‹T>Zo Ho$ {bE 15 {_ZQ >H$m (V) 15 minute time has been allotted to
g_` {X`m J`m h¡ & àíZ-nÌ H$m {dVaU read this question paper. The
nydm©• _| 10.15 ~Oo {H$`m OmEJm & question paper will be distributed
10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db at 10.15 a.m. From 10.15 a.m. to
10.30 a.m., the students will read the
àíZ-nÌ H$mo n‹T>|Jo Am¡a Bg Ad{Y Ho$ Xm¡amZ question paper only and will not
do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo & write any answer on the
answer-book during this period.

BboŠQ´>m°{ZŠg àm¡Úmo{JH$s
ELECTRONICS TECHNOLOGY
{ZYm©[aV g_` : 3 KÊQ>o A{YH$V_ A§H$ : 60
Time allowed : 3 hours Maximum Marks : 60

.344 1 P.T.O.

gm_mÝ` {ZX}e :
(i) Bg àíZ-nÌ _| Xmo IÊS> h¢ — IÊS> H$ : amoµOJma H$m¡eb Am¡a IÊS> I : {df` H$m¡eb &
(ii) IÊS> H$ : amoµOJma H$m¡eb (10 A§H$)
 {XE JE 6 àíZm| _| go {H$Ýht 4 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 1 A§H$ H$m h¡ &
 {XE JE 5 àíZm| _| go {H$Ýht 3 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 2 A§H$ H$m h¡ &

(iii) IÊS> I : {df` H$m¡eb (50 A§H$)
 {XE JE 12 àíZm| _| go {H$Ýht 10 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 1 A§H$ H$m h¡ &
 {XE JE 7 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 2 A§H$ H$m h¡ &
 {XE JE 7 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 3 A§H$ H$m h¡ &
 {XE JE 5 àíZm| _| go {H$Ýht 3 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 5 A§H$ H$m h¡ &

(iv) Bg àíZ nÌ _| 42 àíZ em{_b h¢ {OZ_| go 30 àíZm| Ho$ CÎma XoZo h¢ &
(v) g^r àíZm| Ho$ {deof ^mJ /IÊS> H$mo ghr H«$_ _| H$s{OE &
(vi) A{YH$V_ g_` 3 K§Q>o h¡ &

IÊS> H$ : amoµOJma H$m¡eb (10 A§H$)

{XE JE 6 àíZm| _| go {H$Ýht 4 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 1 A§H$ H$m h¡ & 14=4

1. boI boIZ Š`m h¡ ? 1

2. _h§Jo {dMma h_| H¡$go ào[aV H$aVo h¢ ? 1

3. n¡amZm°`S> go AmnH$m Š`m VmËn`© h¡ ? 1

4. J«rZhmCg CËgO©Z go AmnH$m Š`m VmËn`© h¡ ? 1

5. AmË_-OmJê$H$Vm Š`m h¡ ? 1

6. àoµO|Q>oeZ gm°âQ>do`a _| EH$ àñVw{V go AmnH$m Š`m VmËn`© h¡ ? 1

.344 2

General Instructions :

(i) This question paper consists of two parts viz. Section A : Employability
Skills and Section B : Subject Skills.

(ii) Section A : Employability Skills (10 Marks)
 Answer any 4 questions out of the given 6 questions of 1 mark each.
 Answer any 3 questions out of the given 5 questions of 2 marks each.

(iii) Section B : Subject Skills (50 Marks)
 Answer any 10 questions out of the given 12 questions of 1 mark each.
 Answer any 5 questions from the given 7 questions of 2 marks each.
 Answer any 5 questions from the given 7 questions of 3 marks each.
 Answer any 3 questions from the given 5 questions of 5 marks each.

(iv) This question paper contains 42 questions out of which 30 questions are to
be answered.

(v) All questions of a particular part/section must be attempted in the correct
order.

(vi) The maximum time allowed is 3 hours.

SECTION A : Employability Skills (10 Marks)

Answer any 4 questions out of the given 6 questions of 1 mark each. 14=4

1. What is article writing ? 1

2. How do expensive thoughts motivate us ? 1

3. What do you mean by paranoid ? 1

4. What do you mean by greenhouse emission ? 1

5. What is self-awareness ? 1

6. What do you mean by a Presentation in Presentation Software ? 1

.344 3 P.T.O.

{XE JE 5 àíZm| _| go {H$Ýht 3 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 2 A§H$ H$m h¡ & 23=6

7. g{H«$` lmoVm ~ZZo Ho$ {bE Š`m {Q>ßg h¢ ? 2

8. A{^àoaUm Ho$ òmoV Š`m h¢ ? 2

9. J«rZ Om°ãg B§S>ñQ´>rµO _| Zm¡H$[a`m± H¡$go ~‹T> ahr h¢ ? 2

10. EH$ N>mÌ {deof H$jm _| IwX H$mo H¡$go ~ohVa ~ZmVm h¡ ? 2

11. Amn àoµO|Q>oeZ gm°âQ>do`a _| EH$ àñVw{V H$mo H¡$go god H$a gH$Vo h¢ ? 2

IÊS> I : {df` H$m¡eb (50 A§H$)

{XE JE 12 àíZm| _| go {H$Ýht 10 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 1 A§H$ H$m h¡ & 110=10

12. {ZåZ{b{IV _| go H$m¡Z-gm _mBH«$mo\$moZ \¡$amS>o Ho$ {Z`_ Ho$ {gÕm§V na H$m_ H$aVm h¡ ? 1

(A) H§$S>oÝga
(B) BboŠQ´>oQ>
(C) _yqdJ H$m°Bb
(D) H$m~©Z

13. _yqdJ H$m°Bb bmCS>ñnrH$a Ho$ Mw§~H$ Ho$ {bE Cn`moJ H$s OmZo dmbr gm_J«r h¡ 1
(A) ñQ>rb {_lYmVw
(B) Za_ bmohm
(C) hmS>© ñQ>rb
(D) ApëZH$mo

14. bmCS>ñnrH$a _| EH$ hm°Z© H$m Cn`moJ {H$`m OmVm h¡ 1
(A) BgH$s à{V~mYm _| gwYma H$aZo Ho$ {bE
(B) Cƒ Amd¥{Îm à{V{H«$`m _| gwYma H$aZo Ho$ {bE
(C) hdm _| Üd{Z Ho$ ~ohVa `w½_Z Ho$ {bE
(D) Cn`w©ŠV g^r
.344 4

Answer any 3 questions out of the given 5 questions of 2 marks each. 23=6

7. What are the tips to become an active listener ? 2

8. What are the sources of inspiration ? 2

9. How are jobs increasing in green jobs industries ? 2

10. How can a student make himself better in a special class ? 2

11. How can you save a Presentation in a Presentation Software ? 2

SECTION B : Subject Skills (50 Marks)

Answer any 10 questions out of the given 12 questions of 1 mark each. 110=10

12. Which of the following microphones works on the principle of Faraday’s
law ? 1

(A) Condenser

(B) Electret

(C) Moving Coil

(D) Carbon

13. The material used for the magnet of moving coil loudspeaker is 1

(A) Steel alloy

(B) Soft iron

(C) Hard steel

(D) Alnico

14. A horn is used in a loudspeaker 1

(A) To improve its impedance

(B) To improve the high frequency response

(C) For better coupling of sound into air

(D) All of the above
.344 5 P.T.O.

15. ~‹S>o Iwbo joÌ _| npãbH$ ES´>og Ho$ {bE hm°Z© Q>mBn bmCS>ñnrH$a nhbr ng§X h¡ & 1
(A) ghr
(B) µJbV
16. EH$ CD H$s ^§S>maU j_Vm h¡ 1
(A) 360 KB
(B) 700 MB
(C) 540 KB
(D) 540 MB

17. CD H$s _moQ>mB© h¡ 1
(A) 1·4 mm
(B) 0·6 mm
(C) 0·8 mm
(D) 1·2 mm

18. `{X B-H dH«$ a¡{IH$ h¡, Vmo ~m`qgJ H$s Amdí`H$Vm Zht hmoJr & 1
(A) ghr
(B) µJbV
19. EH$ Q>r.dr. [a_moQ> H§$Q´>mob {H$gHo$ {gÕm§V na H$m_ H$aVm h¡ ? 1
(A) nëg H$moS> g§J«mhH$ AëQ´>mdm`boQ> bmBQ>
(B) {S>_m°S>çyboeZ
(C) nëg H$moS> g§J«mhH$ BÝ\«$maoS> bmBQ>
(D) `m Vmo (A) `m (B)
20. NTSC H$m nyU© ê$n Š`m h¡ ? 1

21. EH$ \$moQ>mog|go{Q>d S´>_ H$m Cn`moJ hmoVm h¡ ________ _| & 1

22. AÝ` Am°{S>`mo ñQ>moaoO _r{S>`m H$s VwbZm _|, EH$ H$m°ån¡ŠQ> {S>ñH$ _| g§Ho$V-ad AZwnmV H$_
hmoVm h¡ & 1
(A) ghr
(B) µJbV
23. DVD H$m nyU© ê$n h¡ _______ & 1

.344 6

15. Horn type loudspeaker is the obvious choice for public address in a large
open area. 1
(A) True
(B) False

16. The storage capacity of a CD is 1
(A) 360 KB
(B) 700 MB
(C) 540 KB
(D) 540 MB

17. The thickness of a CD is 1
(A) 1·4 mm
(B) 0·6 mm
(C) 0·8 mm
(D) 1·2 mm

18. Biasing would not be required if B-H curve were linear. 1
(A) True
(B) False

19. A TV Remote Control works on the principle of 1
(A) Pulse code modulated ultraviolet light
(B) Demodulation
(C) Pulse code modulated infrared light
(D) Either (A) or (B)

20. What is the full form of NTSC ? 1

21. A photosensitive drum is used in a _________. 1

22. As compared to other audio storage media, a compact disc has lower
signal-to-noise ratio. 1
(A) True
(B) False

23. DVD stands for _________. 1
.344 7 P.T.O.

{XE JE 7 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 2 A§H$ H$m h¡ & 25=10

24. dy\$a na g§{jßV {Q>ßnUr {b{IE & 2

25. H¡$no{gQ>|g _mBH«$mo\$moZ Ho$ bm^ Am¡a hm{Z {b{IE & 2

26. CD [aH$m°{S>ªJ {gñQ>_ _| ADC H$m Cn`moJ Š`m| {H$`m OmVm h¡ ? 2

27. Q>r.dr. [agrda _| Hw§${OV E.Or.gr. H$m H$m`© (_hÎd) g_PmBE & 2

28. LED TV Ho$ \$m`Xo {b{IE & 2

29. H$moB© ^r Xmo g§^m{dV g_ñ`mE± {b{IE Omo hoS-E§S> g~goŠeZ _| hmoVr h¢ & 2

30. DTMF Ûmam Amn Š`m g_PVo h¢ Am¡a BgH$m Cn`moJ H$hm± {H$`m OmVm h¡ ? 2

{XE JE 7 àíZm| _| go {H$Ýht 5 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 3 A§H$ H$m h¡ & 35=15

31. CÚmoJm| _| {d{^Þ àH$ma Ho$ IVam| Ho$ ~mao _| ~VmBE & 3

32. EH$ H$m°ån¡ŠQ> {S>ñH$ Š`m h¡ ? BgHo$ \$m`Xo Am¡a ZwH$gmZ {b{IE & 3

33. Q>on [aH$m°S>©a Ho$ H$m`©H$mar {gÕm§V na MMm© H$s{OE & 3

34. EH$ Q>r.dr. [a_moQ> H§$Q´>mob Ho$ H$m`©H$mar {gÕm§V H$s ì`m»`m H$s{OE & 3

35. Q>r.dr. [agrda H$s {d\$bVm Ho$ gm_mÝ` H$maUm| H$mo {b{IE & 3

36. ~«mBQ>Zog, H§$Q´>mñQ d ë`y{_ZoÝg go Amn Š`m g_PVo h¢ ? 3

37. EH$ qàQ>a Ho$ Hw$N> g§^m{dV Xmof Am¡a CZHo$ g_mYmZ {b{IE & 3

.344 8

Answer any 5 questions from the given 7 questions of 2 marks each. 25=10

24. Write a short note on woofer. 2

25. Write advantages and disadvantages of capacitance microphone. 2

26. Why is ADC used in CD Recording system ? 2

27. Explain the function of a Keyed AGC in a TV Receiver. 2

28. Write advantages of LED TV. 2

29. Write any two possible problems which occur in Head-end Subsection. 2

30. What do you understand by DTMF and where is it used ? 2

Answer any 5 questions from the given 7 questions of 3 marks each. 35=15

31. Explain different kinds of hazards in industries. 3

32. What is a Compact Disc ? Write its advantages and disadvantages. 3

33. Discuss the working principle of a Tape recorder. 3

34. Explain the working principle of a Remote Control of a TV Receiver. 3

35. Write general causes of failure of a TV Receiver. 3

36. What do you understand by brightness, contrast, and luminance ? 3

37. Write some possible faults of a Printer and their solutions. 3

.344 9 P.T.O.

{XE JE 5 àíZm| _| go {H$Ýht 3 àíZm| Ho$ CÎma Xr{OE & àË`oH$ àíZ 5 A§H$ H$m h¡ & 53=15

38. gwajm Ho$ àmdYmZm| Am¡a bm^m| na EH$ ZmoQ> {b{IE & 5

39. _yqdJ H$m°Bb bmCS>ñnrH$a Ho$ {Z_m©U, H$m`©H$mar {gÕm§V Am¡a AZwà`moJm| Ho$ ~mao _| ~VmBE & 5

40. EZmbm°J gmC§S> [aH$m°{S>ªJ Am¡a {S>{OQ>b gmC§S> [aH$m°{S>ªJ go Amn Š`m g_PVo h¢ ? ãbm°H$
AmaoI Ho$ gmW g_PmBE & 5

41. ãbm°H$ AmaoI H$s ghm`Vm go µ\¡$Šg _erZ H$s {H«$`m{d{Y H$s ì`m»`m H$s{OE & 5

42. EH$ ãbm°H$ AmaoI H$s _XX go, Q>r.dr. [agrda H$s {H«$`m{d{Y H$s ì`m»`m H$s{OE & 5

.344 10

Answer any 3 questions from the given 5 questions of 5 marks each. 53=15

38. Write a note on provisions and benefits of safety. 5

39. Explain the construction, working principle and applications of a moving
coil loudspeaker. 5

40. What do you understand by Analog Sound recording and Digital Sound
recording ? Explain with block diagram. 5

41. Explain the working of a fax machine with the help of a block diagram. 5

42. With the help of a block diagram, explain the working of a TV Receiver. 5

.344 11 P.T.O.