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Njrpa ntspf;fs epiyak; njhz;ilkhdhW

,uz;lhk; jtizg; guPl;ir - 2024
National Field Work Centre, Thondaimanaru
FWC 2nd Term Examination - 2024

ngsjpftpay; Two Hours 10 Min.

01 T II(A)
Physics Gr. 12 (2025)

Rl;nlz; : ........................................

Kf;fpak; : guPlr
; fupd; cgNahfj;jpw;F
 ,t;tpdhj;jhs; 12 gf;fq;fisf; nfhz;Ls;sJ. khj;jpuk;

g
,uz;lhk; tpdhj;jhSf;F
 ,t;tpdhj;jhs; A, B

r
vd;Dk; ,U
gFjp tpdh ,y. Gs;spfs;
gFjpfisf; nfhz;Ls;sJ. ,U

o
1

.
gFjpfSf;Fk; xJf;fg;gl;l Neuk; ,uz;L
kzpj;jpahyq;;fs; gj;J epkplq;fs; MFk;. 2

n
A
3

o
 fzpg;ghidg; gad;gLj;jf;$lhJ
4

e
gFjp A – mikg;Gf; fl;Liu
5

e
vy;yh tpdhf;fSf;Fk; ,j;jhspNyNa tpil
vOJf. xt;nthU tpdhTf;Fk; tplg;gl;Ls;s 6

.b
,lj;jpy; ckJ tpilfis vOJf. B 7
nfhLf;fg;gl;Ls;s ,lk; ckJ tpilfSf;Fg;
,yf;fj;jpy;

w
NghJkhdJ vd;gijAk; tpupthd tpilfs;
nkhj;jk;
mtrpakpy;iy vd;gijAk; ftdpf;f. vOj;jpy;

gFjp B – fl;Liu
w
w
,g;gFjp %d;W tpdhf;fisf; nfhz;Ls;sJ.
mtw;wpy; ,uz;L tpdhf;fSf;F khj;jpuk; tpil
FwpaPl;nlz;fs;
vOJf. ckf;F toq;fg;gLk; jhs;fis ,jw;Fg;
gad;gLj;Jf. tpilj;jhs;fisg; guprPypj;jtu; 1

tpilj;jhs;fisg; guprPypj;jtu; 2
 ,t;tpdhj;jhSf;nfd toq;fg;gl;l Neu Kbtpy;
Gs;spfisg; guprPypj;jtu;
gFjp A NkNy ,Uf;Fk;gbahf A, B Mfpa
,uz;L gFjpfisAk; xd;whfr; Nru;j;Jf; fl;ba Nkw;ghu;it nra;jtu;

gpd;du; guPl;ir Nkw;ghu;itahsuplk; ifaspf;f.

 tpdhj;jhspd; gFjp B I khj;jpuk; guPl;ir

kz;lgj;jpypUe;J ntspNa vLj;Jr; nry;y
mDkjpf;fg;gLk;.

juk; - 12 (2025) 2k; jtiz (FWC) 1 ngsjpftpay; - II (A)

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gFjp - IIA
mikg;Gf; fl;Liu
01) (a) (i) Nfhskhdp gad;gLj;jg;gLk; re;ju;g;gq;fs; 2 jUf.
.............................................................................................................................................................................
.............................................................................................................................................................................
(ii) Nfhskhdp tl;l mstpil xd;W ,U G+uz Rw;Wf;fis epfo;j;Jk; NghJ mJ
gpujhd mstpilapd; 1𝑚𝑚 J}uk; efu;fpwJ. mj;Jld; tl;l mstpilahdJ
50 gpupTfshf gpupf;fg;gl;Ls;sJ. ,f; Nfhskhdpapd; ,opT vz;zpf;if?
.............................................................................................................................................................................
.............................................................................................................................................................................

(b)

r g
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e e
b
(i) Nkw;gb NfhskhdpahdJ fz;zhbj;jl;L xd;wpd; kPJ itf;fg;gl;L mjd;

.
ehd;F fhy;fSk; fz;zhbj;jl;il njhLkhW itf;fg;gl;l NghJ mjd;

w
thrpg;G Nkw;gb fhzg;gl;lJ. mjd; thrpg;ig jUf.
.............................................................................................................................................................................

w
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(ii)

w
NfhskhdpahdJ kPzL
; k; Ftpthd xU tisNkw;gug;gpy; itf;fg;gl;L mjd;
ehd;F fhy;fSk; tise;j Nkw;gug;ig njhLkhW nra;ag;gl;l NghJ
Nfhskhdpapd; thrpg;G epiy gpd;tUkhW mike;jJ.

,jw;Fupa thrpg;igf; fhz;f.

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juk; - 12 (2025) 2k; jtiz (FWC) 2 ngsjpftpay; - II (A)

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(iii) ,jpypUe;J eLf;fhy; cau;e;j cauj;ij fhz;f.

.............................................................................................................................................................................
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(iv) ,f;NfhsNkw;gug;gpd; tisT Miuia Jzptjw;F Nfhskhdpapd; gf;f
fhy;fSf;fpilahd J}uk; msf;fg;gl Ntz;Lk;. ,jid vt;thW
mstpLtPu;fs; vd RUf;fkhf Fwpg;gpLf.
.............................................................................................................................................................................
.............................................................................................................................................................................
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(v) Nkw;gb mstPl;by; fhy;fSf;fpahd J}uk; 3𝑐𝑚 vd jug;gbd;
𝑎2 ℎ
NfhsNkw;gug;gpd; tistpd; Miuia fhz;f. cjtp :- (𝑅 = 6ℎ + 2 )

g
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r
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(c) (i) ePzl

; fhy ghtidapd; gpd; Nfhskhdp

n . xd;wpy; Vw;glf;$ba FiwghL

o
xd;iwf; $Wf.

e
.............................................................................................................................................................................

e
(ii) ,f;Fiwghl;il mstPl;bd; NghJ vt;thW Fiwj;Jf; nfhs;syhk;.

. b
.............................................................................................................................................................................

w
(iii) Nfhskhdpnahd;wpd; ,opntz;zpf;ifia Fiwg;gjw;F khw;wq;fis rpghupR
nra;f.

w
.............................................................................................................................................................................

02)

w
Ma;T$lj;jpy; fz;zhbapd; mlu;j;jpia Jzptjw;F xU gf;f ePsk; Vwj;jho 3𝑐𝑚
MdJk; Vwj;jho 60𝑔 jpzpTs;sJkhd fz;zhbr; rJuKfp ckf;F toq;fg;gl;Ls;sJ.
(a) (i) rJuKfpapd; xU gf;fj;jpd; ePsj;ij (ℓ)1% ,Yk; $ba nrk;ikAld;
msg;gjw;F Ma;T$lj;jpy; ePu; gad;gLj;Jk; cgfuzk; ahJ?
.............................................................................................................................................................................
(ii) fz;zhbr; rJuKfpapd; fdtstpw;fhd xU Nfhitia ℓ ,d; rhu;gpy;
vOJf.
.............................................................................................................................................................................

(b) jpUg;gf; Nfhl;ghl;ilg; gad;gLj;jpr; rJuKfpapd; jpzpitf; fhz;gjw;Fg; gpd;tUk;

cUg;gbfs; ckf;F toq;fg;gl;Ls;sd.
kPw;wu;Nfhy;
fj;jpNahuk;
20𝑔, 50𝑔, 100𝑔 epiwfs; ,ioj;Jz;Lfs;

juk; - 12 (2025) 2k; jtiz (FWC) 3 ngsjpftpay; - II (A)

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(i) rJuKfpapd; jpzpit $ba nrk;ikAld; Jzptjw;Fj; jug;gl;Ls;s

epiwfspilNa ePu; njupe;njLf;Fk; epiw ahJ? ckJ njuptpw;fhd
fhuzj;ijj; jUf.
epiw - .......................................................................................................................................................
fhuzk; - .......................................................................................................................................................
(ii) Kjypy; kPw;wu;Nfhiy fj;jpNahuj;jpy; itf;f Ntz;Lk;. kPw;wu;Nfhypd;
vj;jdj;ijf; fj;jpNahuj;jpd; kPJ itf;f Ntz;Lk; vd;gij vq;qdk; ePu;
fhz;gPu;?
.............................................................................................................................................................................
.............................................................................................................................................................................
(iii) jpzpitf; fhz;gjw;F ePu; gad;gLj;Jk; xOq;fikg;gpd; ngaupl;l tupglj;ij
tiuf. NkNy jug;gl;Ls;s cUg;gbfis khj;jpuk; gad;gLj;Jf.

r g
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e e
. b
(iv) fz;zhbr; rJuKfpapd; jpzpT> njupe;njLj;j epiwapd; jpzpT Mfpad
KiwNa 𝑚, 𝑀 vdf; nfhs;Nthk;. ,q;F ngwg;gLk; J}u mstPLfis (ℓ1 , ℓ2 ).
NkNy (𝑏)(𝑖𝑖𝑖)

w ,y; tiue;j tupglj;jpd; kPJ Fwpj;J 𝑚, 𝑀, ℓ1 , ℓ2

w
Mfpatw;iwj; njhlu;GgLj;Jk; Nfhitia vOJf.
.............................................................................................................................................................................

w
(v) NkNy (𝑎)(𝑖𝑖) ,Yk; (𝑏)(𝑖𝑣) ,Yk; vOjpa Nfhitfisg; gad;gLj;jpf;
fz;zhbapd; mlu;j;jp (𝑑𝑔) ,w;Fupa xU Nfhitia vOJf.
.............................................................................................................................................................................
(c) (i) xU ePu; Kfit toq;fg;gl;bUg;gpd; rJuKfpapd; fdtsitf; fzpf;fhky;
fz;zhbapd; mlu;j;jpia (𝑑𝑔) Jzpayhk;. fj;jpNahuj;jpypUe;J fz;zhbr;
rJuKfpf;F cs;s J}uj;ij khwhky; itj;Jf;nfhz;L 𝑑𝑔 iaj; Jzptjw;Fg;
ngw Ntz;ba Nkyjpf mstPL (ℓ3 ) ahJ?
.............................................................................................................................................................................
(ii) 𝑑𝑔 apw;;Fupa xU Nfhitia ℓ1 , ℓ2 , ℓ3 ePupd; mlu;j;jp (𝑑𝜔) Mfpatw;wpd;
rhu;gpy; ngWf.
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juk; - 12 (2025) 2k; jtiz (FWC) 4 ngsjpftpay; - II (A)

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03) ghlrhiy Ma;T$lj;jpy; jputk; xd;wpd; rhu; mlu;j;jpia

Jzptjw;fhd Vaupd; Ma;fUtp cgfuz xOq;fikg;G 𝑮
mUfpy; cs;s glj;jpy; fhl;lg;gl;Ls;sJ.
(a) (i) Nkw;gb cgfuzkhdJ 𝑈 FohAld; xg;gpLk;
NghJ vt;tifahd jputq;fSf;F cfe;jJ.

...........................................................................................................
𝒉𝒘 𝒉𝓵
(ii) ,t; cgfuzj;jpy; gad;gLj;jg;gLk; Fohapd; 𝒙
𝒚
mz;zsthd tpl;lj;ij 𝑐𝑚 ,y; jUf.

...............................................................................................................

(iii) glj;jpy; fhl;lg;glhj/jug;glhj Njitahd mstPl;L cgfuzk; xd;iwf;

g
Fwpg;gpLf.

r
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o
(iv)

.
,q;F ,izf;fg;gl;l nfstp 𝐺 ,d; gad;ghL ahJ?

n
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(b) (i) ePu;> jput epuy;fis FohapDs; vt;thW epiyepWj;JtPu; vd;gijj; njspthff;
Fwpg;gpLf.

e o
e
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. b
(ii) 𝑕𝜔 - Kfit ePu; kl;lj;jpy; ,Ue;jhd ePu; epuypd; cauk;
𝑕𝑒 - Kfitapd; jput kl;lj;jpy; ,Ue;jhd jput epuypd; cauk;

w
𝜌𝜔 - ePupd; mlu;j;jp

w
𝜌ℓ - jputj;jpd; mlu;j;jp
𝑃𝑜 - tspkz;ly mKf;fk;

w
Nkw;gb juTfisf; nfhz;L 𝑃𝑜 ,w;fhd ,U njhlu;Gfisg; ngWf.

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(iii) Nkw;gb ,U njhlu;Gfspy; ,Ue;J Neu;Nfhl;L tiuG xd;wpd; gbj;jpwd; rhu;

mlu;j;jpia jUkhW rkd;ghL xd;iwg; ngWf.
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(iv) tiugpy; rhu;e;j khwp> rhuhj khwpiaf; Fwpg;gpLf.

rhu;e;j khwp - ....................................................................................................................................

rhuh khwp - ....................................................................................................................................

juk; - 12 (2025) 2k; jtiz (FWC) 5 ngsjpftpay; - II (A)

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(v) vjpu;ghu;fF
; k; tiuig mz;zsthf tiue;J fhl;Lf.

(c) (i) jput epuy;fis FohapDs; epiy epWj;Jk; NghJ mjpf ftdk; nrYj;j
Ntz;ba jput epuy; ahJ? mjw;fhd fhuzk; ahJ?
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g
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r
(ii) xt;nthU jlitAk; jput epuy;fis epiyepWj;jpa gpd; mstPl;il

o
Nkw;nfhs;s Kd; rupnra;a Ntz;ba gFjpfs; vit? vt;thW rup nra;tuP ?;

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04) tspapy; xypapd; fjpiaj; Jzptjw;F ghlrhiy

e
,irf;fit
Ma;T$lj;jpy; gad;gLj;jg;gLk; gupNrhjid cgfuz

. b
xOq;fikg;G glj;jpy; fhl;lg;gl;Ls;sJ.
(a) (i) Nkw;gb gupNrhjidapy; gad;gLj;jg;gLk; 𝑳

w
gupTf; Fohapd; tpl;lj;jpidj; njupT nra;f.

w
(I) 4𝑚𝑚 (II) 25𝑐𝑚 (III) 2.5𝑐𝑚
gupTf;Foha;
(ii) gad;gLj;jg;gLk; gupTf;Fohapd; mz;zsthd

w
cauk; ahJ?
..................................................................................................... ePu;

(iii) ,t; xOq;fikg;gpy; jug;glhj mstPl;L cgfuzk;

kw;Wk; mstPl;L cgfuzk; jtpu;e;j kw;iwa cgfuzk;
xd;W jUf.
mstPl;L cgfuzk; : .......................................................................

cgfuzk; : .......................................................................

(iv) ePu; nfhz;l Kfitapy; gupTf;Foha; mkpo;j;Jtjd; Nehf;fk; ahJ?

.............................................................................................................................................................................

.............................................................................................................................................................................

(b) (i) ,irf;fit mjpu;tjhy; tspapy; cUthf;fg;gLk; miyapd; tif ahJ?

.............................................................................................................................................................................
juk; - 12 (2025) 2k; jtiz (FWC) 6 ngsjpftpay; - II (A)

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(ii) KjyhtJ gupTepiy vt;thW ngWtPu; vd;gijr; RUf;fkhf tpgupf;Ff.

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(iii) Kjyhk;> ,uz;lhk; gupTepiyfspw;F Fohapd; ePu;kl;l epiyfisAk; epd;w

miyf;Nfhyq;fisAk; KidTj;jpUj;jj;Jld; tiue;J fhl;Lf.

r g
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(c) (i) Kjyhk; mjpu;T tiff;F xj;j

e e gupT ePsk; ℓ1 vdpd; ℓ1 ,w;Fupa xU

. b
Nfhitia miyePsk; 𝜆 > Fohapd; Kidj;jpUj;jk; 𝑒 Mfpatw;wpy; vOJf.
.............................................................................................................................................................................

w
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w
(ii) ,uz;lhk; mjpu;T tiff;F xj;j gupT ePsk; ℓ2 vdpd; ℓ2 ,w;Fupa xU
Nfhitia miyePsk; 𝜆> Fohapd; Kidj;jpUj;jk; 𝑒> Mfpatw;wpy; vOJf.

w
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(iii) ,jpypUe;J (ℓ2 − ℓ1 ) ,w;fhd xU Nfhitia 𝜆 ,y; vOJf.
.............................................................................................................................................................................
(iv) (ℓ2 − ℓ1 ) Ig; ngWtjd; mD$yk;.
.............................................................................................................................................................................
(v) Nkw;gb Nfhitapy; ,Ue;J ,irf;fUtpapd; kPbwd; 𝑓 tspapy; xypapd;
Ntfk; 𝑣 Mfpatw;iw njhlu;GgLj;jp xypapd; Ntfj;jpw;fhd Nfhitiag;
ngWf.
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juk; - 12 (2025) 2k; jtiz (FWC) 7 ngsjpftpay; - II (A)

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(vi) khztd; xUtd; ,g;gupNrhjidapy; xypapd; Ntfj;ij tiuG Kiwapy;

Jzpa Kw;gl;lhy; mtDf;F Njitahd Nkyjpf cgfuzq;fs; ahit?

.............................................................................................................................................................................

(vii) 𝐶 (𝑣) ,y; ngw;w njhlu;gpid Neu;Nfhl;L tiuig ngWkhW xOq;fikf;f.

.............................................................................................................................................................................

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(viii) tiugpy; rhu;e;j khwpyp> rhuh khwpyp vd;gtw;iwf; Fwpg;gpLf.

rhu;e;j khwpyp - ....................................................................................................................................

rhuh khwpyp - ....................................................................................................................................

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juk; - 12 (2025) 2k; jtiz (FWC) 8 ngsjpftpay; - II (A)

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