rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h ud;r rdyq, Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College Matara Rahula College - Matara

rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq,

jsoHd,h - ud;r rdyq, jsoHd,h - ud;r Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College – Matara

m
12 fY%aKsh Grade 12

meh 01hs One Hour

g = 10 NKg-1  1'

2'

3'

4'

m%Yak ish,a,gu ms
ixLHd;h

2'

;, fldaKh

4'

ialkaOh

5.

úoHq;a Odrdj

3'

ld¾hh

3'

0.2 GW

úoHq;a n,d.drhl Odß;dj 200 MW th .s.d fjdÜj,ska" 1'

200 GW

2'

2 GW

4'

2000 GW

5.

0.02 GW



a  t2 a iólrKfha P hkq mSvkho" x hkq ÿr o" t hkq ld,h o fõ' ys udk jkqfha" bx b

1'

1L12

2'

1L12

4'

 0 L12

5.

1L02

A)

ld¾hh yd Yla;sh g tlu udk mj;s'

B)

m%fõ. wkql%uKh yd ixLHd;h g tlu udk mj;s'

C)

wdfõ.h yd m%fõ.h g tlu udk mj;s'

3'

1L12

by; i|yka m%ldY j,ska"

5'

1'

A muKla i;H fõ

2'

A yd B muKla i;Hh fõ

3'

A yd C muKla i;Hh fõ

4'

B yd C muKla i;Hh fõ

5.

A, B yd C hk m%ldY ;=ku i;Hh fõ

jZ ksh¾ mßudKhla iys; ñkqï WmlrKhl m%Odk mßudKfha

1 mm fldgia 49 la jZ ksh¾ 2

fldgia 50 lg fnod we;' WmlrKfha l=vdu ñkqu 1mm lska 1'

1 50

2'

4'

1 98

5.

1 10 1 49 1

3'

1 100

6'

l=vdu ñkqu 0.01 mm jk uhsfl%daógr bial=remamq wdudkhl boao yd 0

45

lsksysrh iam¾Y jQ úg mßudK msysgk wdldrh rEmfha oelafõ' WmlrKfha uq,dxl fodaIh yd fYdaOkh jkafka"

1'

0.47 mm jk w;r th mdGdxlfhka wvql< hq;=h'

2'

0.47 mm jk w;r th mdGdxlhg tl;= l< hq;=h'

3'

0.03 mm jk w;r th mdGdxlfhka wvql< hq;=h'

4'

0.03 mm jk w;r th mdGdxlhg tl;= l< hq;=h'

5.

uq,dxl fodaIhla ke;s neúka fYdaOkhla l< hq;= ke;'

7'

isÿrl .eUqr ueksu i|yd fhdod .;a f.da,udkfha wka;rd,h

5

1.0 mm ls' jD;a;dldr mßudKh fldgia 100 lg fnod we;' mßudK msysgd we;s wdldrhg wkqj ñkqu jkafka"

0 78

5

1'

1.22 mm

2'

1.78 mm

4'

1.00 mm

5.

1.07 mm

3'

1.88 mm

8'

(B)

(A)

úoHd.dr p, wkaùCIh u.ska flaYsl k,hl wNHka;r úYalïNh i|yd mdGdxl ,nd.;a wjia:djla by; rEm igykaj, fmkajhs' (B) rEmfha mdGdxlh

8. 192 cm kï

(A) rEmfha

mdGdxlh úh yelafla"

9'

1'

8. 294 cm

2'

8.091 cm

4'

18. 192 cm

5.

9. 188 cm

3'

18.003 cm

,S l=Üáhl os." m<, yd Wi ms
1%

2'

0.5 %

4'

3%

5'

1.5 %

3'

2

2%

D 10'

A

E J

G

F _

AB,

_

B

C

I

_

_

BC, CD, DE ,

_

H

_

_

_

_

_

_

AH , HG, GF , FE, AI , IE,

_

_

JE, yd EA, hk ffoYslj,

AJ ,

iïm%hqla;h jkafka" _

_

1'

EA

4'

3 AE

2'

5 AE

5.

4 AE

_

11'

_

3'

2 EA

_

m%fõ. ffoYslhl tlsfklg ,ïN ixrpl foflka tlla 20 ms-1 la jk w;r th tu ffoYslh iu`. 60o l fldaKhla idohs kï wfkla ixrplfha úYd,;ajh jkafka"

12'

1'

40 3 ms-1

2'

30 ms-1

4'

40 ms-1

5.

30 3 ms-1

20 3 ms-1

3'

50 N ne.ska jk iudk tal;, ffoYsl 6 la ,CIHhla u; l%shd lrhs' tajd w;r fldaK iudk kï iïm%hqla;h"

13'

1'

300 N

2'

150 N

4'

50 N

5.

Y+kH fõ

3'

100 N

wdk; n, foflka tlla úYd,;ajfhka wfkl fuka fo.=Khla fõ' n, w;r fldaKh 60o ls' iïm%hqla;h" úYd,;ajfhka wju jq n,h iu. idok fldaKfha sin w.h jkqfha"

14'

1'

2 7

2'

3 7

4'

2 7

5.

3 2

3'

3

2 ms-1 fõ.hlska mshdUk iuk,hl= 8 ms-1 fõ.hlska ol=Kq osYdjg .uka lrk 10 m la os. nihla miqlr W;=re osYdjg mshdUd hhs' iuk,hdg nih miqlr hdu i|yd .;jk ld,h" 1'

3.0 S

2'

1.5 S

4'

0.5 S

5'

2.5 S

3

3'

1.0 S

15'

W;=re foig fhduqj mshdir lrk .=jka hdkhl fõ.udkfha mdGdxlh 40 ms-1 ls' ngysr isg kef.kysr foig 30 ms-1 fõ.fhka iq
16'

1'

3 50 ms-1, tan-1   4

2'

 3 50 ms-1, tan-1   5

3'

4 25 ms-1, tan-1   3

4'

 3 25 ms-1, tan-1   5

5.

3 35 ms-1, tan-1   4

m%ia;dßl ksrEmkfha oS" (A) ksYaÑ; w.hkaj, mj;ajd .kakd rdYsh iajdhla; úp,Hh fõ' (B) iajdhla; úp,Hhg wkqj fjkiajk rdYsh mrdhla; úp,Hh fõ' (C) iïnkaê; rdYsj, ñkqï w;r mj;sk iïnkaoh wkdjrKh lr.; fkdyel'

17'

1'

A ksjerosh

2'

B yd C ksjerosh

3'

A yd B ksjerosh

4'

A, B yd C ;=ku ksjerosh

5.

A yd C ksjerosh

fudag¾ fndaÜgqjla 40 kmh-1 l fõ.fhka iDcq ud¾.hla Tiafia ÿm;lg f.dia kej;;a tu ud¾.fhau 60 kmh-1 l fõ.fhka fjr
18'

1'

50 kmh-1

2'

3'

24 kmh-1

4'

48 kmh-1 20 kmh-1

5.

Y=kH fõ

ksYap,;djfhka mgka f.k ir, f¾Çh ud¾.hl .uka lrk jia;=jl ;ajrKh 2 ms-2 fõ' tu jia;=j fojk yd isõjk ;;amr ;=,os .uka l< ÿrj, tl;=j jkafka"

19'

1'

20 m

2'

16 m

4'

10 m

5.

4m

3'

12 m

fudag¾ r:hl v-t m%ia;drh my; oelafõ' 20 S l oS isÿl< úia;dmkh jkqfha" V(ms-1)

25

1'

100 m

2'

125 m

4'

250 m

5.

500 m

t (s) 10

4

3'

200 m

V(ms-1)

20. 8 6 4 2 2

4

6

8

10

12 14

t (s)

16

Odjk m:hl ÿjk Odjlhl=f.a p,s;h i|yd v-t m%ia;drh by; oelafõ' p,s; ld,h ;=, isÿl, úia;dmkh yd t=11 s oS ukaokh jkqfha"

21.

1'

92 m yd 2 ms-2

2'

64 m yd 2 ms-2

4'

92 m yd 1 ms-2

5.

80 m yd 2 ms-2

3'

76 m yd 1ms-2

ld,h (t)=0 os úia;dmkh (s)  o o wdrïNl m%fõ.h (u)  o o taldldr ;ajrKhla iys; p,s;hl s-t m%ia;drh jkqfha" S

S

t

t (1)

S

S

t

t (4)

(3)

(2)

S

t (5)

22.

35 m la Wi l=¨Kl isg ;srig 25o l wdk;shlska 80 ms-1 l m%fõ.fhka fnda,hla úis lrhs' fnda,h fmd
72. 5 ms-1 33. 8 ms-1

23.

2' 5.

84. 2 ms-1 22. 8 ms-1

3'

42. 9 ms-1

4m

10o

10 o

;srig 10o l wdk;shlska hq;a mdrl 4 m la m<, j,la we;' fuu j, u`. yrjd h;=re meoshg hdu i|yd h;=re meosh ,nd.; hq;= wju m%fõ.h jkafka (sin 20o = 0.3420 )" 1'

10.8 ms-1

2'

14.5 ms-1

4'

21.2 ms-1

5.

6.4 ms-1 5

3'

9.5 ms-1

A

24.



rEmfha mßos  os.e;s iqug wdk; ;,hl A ysos wxY= 2 ;a tljr uqod yßhs' tla wxY=jla .=re;ajh hgf;a isria p,s;hl o wfkl .=re;ajh hgf;a wdk; ;,h osf.a o p,s; fõ' fuu p,s; fol i|yd .;jk ld,j, .=Ks;h iudk jkqfha"

1' 4'

25.

4 g 2 g

2'

 g

3'

2 g

 g

5.

l=¨Kl isg iSrefjka uqod yßk fnda,hla wjidk 2 S los uq¿ ÿfrka Nd.hla f.jd hhs' fnda,h ìug m;s; úug .;jk uq¿ ld,h jkqfha" 1'

(4  2 5 ) S

2'

(4  2 2 ) S

4'

(3  5 ) S

5.

(3  2 5 ) S

6

3'

(3  2 2 ) S

rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h ud;r rdyq, Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College Matara Rahula College - Matara

rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq, jsoHd,h - ud;r rdyq,

jsoHd,h - ud;r rdyq, jsoHd,h - ud;r Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College - Matara Rahula College – Matara

m% : u jdr mÍCIKh - 2016 First Term Test - 2016 fN!;sl úoHdj II Physics II 

12 fY%aKsh Grade 12

meh 1 úkdä 30 hs One & half hours

ish¿u m%Yak j,g ms
01'

I.

by; rEm igyfka oelafjkafka uhsfl%dñgr bial=remamq wudkhl rEmigykls' tys A, B, C, D, E, F fldgia kï lrkak

II.

A - ……………………………………

B - ……………………………………..

C - …………………………………….

D- ……………………………………...

E- ……………………………………..

F- ………………………………………

fuu WmlrKfha bial=remamq wka;rd
III.

ksjeros uhsfl%dañg¾ bial=remamq wdudkhlska .;a ñkqul mßudk msysáu my; oelafõ' tu ñkqfï w.h fldmuKo@

1

IV.

by; WmlrKfha boao yd lsKsysr iam¾Y jq úg mßudK msysáu my; mßosh'

a. WmlrKfha uq,dxl jro .Kkh lrkak ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… b. tu jro Ok jrolao" iDK jrolao@ ………………………………………………………………………………………………… V.

by; uq,dxl jro iys; WmlrKfhka III jk fldgfia ñkqu ,nd.;af;a kï mßudK msysgqu we| olajkak' …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

VI.

uhsfl%dñgr bial=remamq wudkhlska lïìhl úIalïNh uekSfï oS lsysm m,lska ñkqï ,nd .ks' fufia lsÍug fya;=j meyeos,s lrkak …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

VII.

uhsfl%dñgr bial=remamq wudkhlska lïìhl úIalïNh uekSfï oS ,nd.;a mdGdxl 3la my; oelafõ 1.21 mm, 1.22 mm, 1.20 mm, lïìfha úIalïNh ljf¾o@ …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

VIII.

wdikak jYfhka 3cm úIalïNfhka yd os. 12 cm jk oKavl mßudj fiùug .kakd mdGdxl fudkjdo@ ta i|yd tla tla mdGdxlh .ekSfï oS Ndú;d l, hq;af;a my; WmlrKj,ska l=ulao@ (a) uhsfl%dñ a gr bial=remamq wudkh

(b) óg¾ fldaÿj

(c) jZksh¾ le,smrh 2

…………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… by; f;dard .ekSug fya;= myokak'

IX.

…………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… 02'

I.

rEmfha oelafjk f.da,udkfha A yd B fldgia kï lrkak

…………………………………………………………………………………………………… …………………………………………………………………………………………………… II. bial=remamq wka;rd,h 0.5 mm yd jD; mßudKh fldgia 50 lg fnod we;akï l=vdu ñkqu ljf¾o@ …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… III. f.da,udkfha mdo ;sria ;,hl msysghs' bial=remamq ;=v tu ;,h iam¾Yjk mßos ilid .ekSug Tn .kakd l%shdud¾.h meyeos,s lrkak' …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

3

IV. fuys (a) u.ska oelafjkafka f.da,udkfha mdo yd bial=remamq

25 0

35

0

;=v tlu ;sria ;,fha msysá wjia:djhs' (b) rEmfha oelafjkafka tu f.da,udkfha isyska ;yvqjl >klu

(a)

uekSfï oS ,o mdGdxlhhs' ;yvqfõ >Klu fldmuKo@

(b)

…………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… V. f.da,udkhla wdOdrfhka f.d,hl jl% mDIaGfha wrh uekSfï oS f.d,udkfhka .kq ,nk mdGdxl fol ljf¾o@ …………………………………………………………………………………………………… …………………………………………………………………………………………………… VI. 25 0

25

0

V. fldgfia f.da,udkfhka .;a mdGdxl folg wod< rEmigyka (c) yd (d) u.ska oelafõ' fuu mdGdxl j,g wod
(c)

(d)

;=fvys úia:dmkh fldmuKo@

…………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… VII.

f.da,udkfha mdo 2la w;r ÿr 5 cm kï f.da,Sh jl% mDIaGfha wrh .Kkh lrkak …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… …………………………………………………………………………………………………… ……………………………………………………………………………………………………

4

rpkd 

ish¿u m%Yak j,g ms
01' B

A

D 0.8 m

1.2 m

rEmfha mßos A yd B fg%d,s folla 20 cms-1 yd 10 cms-1 taldldr m%fõ. j,ska C ì;a;sh foig .uka lrhs' B fg%d,sh C ì;a;sfha jeoS CIKslj wdmiq yeÍ tu m%fõ.fhkau kej; D foig meñfKa' iuqøfoaY ,CIh f,i D i,lkak' fg%d,sj,g we;s os.j,a fkdi,lkak' i.

B fg%d,sh C ì;a;sfha josk fudfyd; jk úg A .uka l, ÿr fidhkak'

ii.

B fg%d,sh C ys jeoS wdmiq yeß tafïoS th A iu`. .efÜ' .efgk úg A .uka l, ÿr fidhkak'

iii.

A yd B ys p,s; wdrïNfha isg A yd B .efgk fudfyd; olajd úia:dmk ld, m%ia:drhla A yd B p,s; i|yd tlu m%ia:drhla w|skak' m%ia;drfha p,s;hkag wod< úi:dmkhka j, úYd,;ajhka yd ld,j, úYd,;ajhka m%ia:drfha olajkak'

iv.

by; p,s;hg wod, m%fõ. ld, m%ia:drhla o tlu m%ia:drfha w|skak' m%fõ.j, úYd,;aj yd ld,h;a m%ia:drfha olajkak' B

02'

20 ms-1 30o 1m

15 m

fmd
fouy,a ksjil fmd
j÷rd mksk wU w;a;g ìu isg we;s Wi fldmuKo@ ksjfia ì;a;sh;a jyf,a fl,jr;a w;r ÿr 1 m kï" ì;a;sfha isg wU w;a;g we;s ;sria ÿr fldmuKo@ j÷rdg wU w;a; w,a,d .ekSug fkdyelS ù kï W! ìug jefgk ;sria mrdih ì;a;sfha isg fldmuKo@ ìu josk m%fõ.fha ;sria yd isria ixrpl fldmuKo@

iv.

ñksfila wU w;af;a isák j÷rdg jdhq ;=jlal=jlska fjä ;nhs' ;=jlal=fõ lgg ì;a;sfha isg Wi 4 m la o ì;a;sfha isg ;sria ÿr 2m la o fõ' fjä,af,a ;srig wd;;sh 45o ls' fjä ;nk WKavfha fõ.h 200 ms-1 ls' j÷rdg ;=jlal=fõ fjä Yíoh wefik úg W! bj;g mkS' j÷rdf.a m%;sl%shd ld,h 0.04 S la kï" j÷rdg fjä,a, joSú o@

v.

v2  u 2  2as p,s; iólrKh udk Ndú;fhka ksjeros nj myokak' 5

B fldgi - rpkd 

m%Yak ish,a,gu ms
01' (a) >k;ajh  jQ øjhla mqrjd we;s rEmfha oelafjk mßos jq gexlshl wdk; mDIaGh u; os. a yd m<, b jq ;yvqj .s,a,d we;'



øjh u.ska ;yvqj u; w;sjk iM, f;rmqï n,h oS we;s

;yvqj

mrdñ;s weiqßka m%ldY lrkak'

l

^1& rEmh

a (b)

fuu ;yvqj Ndú;d lr óg¾ ;=kla (3m) Wig c,h msÍ we;s jejl c,h md,kh lsÍug ^2& rEmfha mßos oajdrhla ;kd we;' fï i|yd fuu ;yvqjg W Ndrhla t,a,k ,o os. 0.6 m jq wdOdrlhla iys;j O ysos új¾;kh lr we;' a = 5 m, b = 2m yd   1000 kg m-3 kï c,h r|jd .ekSug wjYH W ys wju ialkaOh fidhkak' ^;yvqfõ ialkaOh fkdi,ld yßkak&

(C) fuu gexlsfhka msgjk c,h c, úÿ,s n,d.drh we;s wNHka;r úIalïNh 2 cm jq k,hlg 4x105 pa mSvkhla hgf;a 4 ms-1 fõ.fhka we;=,a fõ' c,h fuu k,h Tiafia .ukalr 5 m my,ska we;s g¾nhsk¾ l=àrhla ;=, jq gexlshlg we;=¨ jkafka 1 cm l úIalïNhla iys; k,hla ;=,sks' gexlshg c,h we;=¨ jk fõ.h;a" mSvkh;a fidhkak' c,fha >k;ajh 1000 kg m-3 jk w;r wkdl+, f,i m%jdyh jkafka hhs i,lkak'

3m

a O

0.6 m ^2& rEmh W

(d) by; c, myr g¾nhskfha ;yvqjla u; tys fl,jfrys ,ïnlj jeosug i,iaid we;' g¾nhskfha me;a;l os. 4 m kï c, myr ksid g¾nhskfha ;yvqj u; w;sjk n,h;a O jgd jHjd¾;h;aa .Kkh lrkak' ^c,h g¾nhskfha ;yvqjl jeÿkq miq fmd,d meksulska f;drj ;yvqj osf.a my,g .uka lrfka hehs i,lkak' fuys  = 3 f,i .kak'&

1

(e)

g¾nhskfha O jgd uq¿ wjiaÓ;s >q¾Kh 120 kg m2 fõ' by; c, myr jeosu ksid th p,s; úu wrUk fldaKsl ;ajrKfha w.h fidhkak' g¾nhskh O jgd N%uKh úh yels fia új¾;kh lr we;

4m

O

(f) fuu g¾nhskh Ndú;fhka úÿ,sh ksmoùfï oS ñks;a;= 30 la ;=,os c,fha uq¿ Yla;s ydksh 5x109 J kï o fuu ld,h ;=, 4.5x109 J úoHq;a Yla;hla tu.ska ksmojhs kï (i)

g¾nhskfha m%;sodk úoHq;a CIu;djh;a

(ii)

ld¾hCIu;djh;a .Kkh lrkak'

02' (a) we|s ;ka;=jla ueoska fm¨ úg ;ka;=j lïmkh úh yels uq,sl wdldrh yd B<`. lïmk wdldrh;a weo fmkajkak' (b) wp, ì;a;s folla w;r weo we;s ;ka;=jla ueoska fm¨ úg ie,lsh hq;= yfâ ierla ìys fkdjk kuq;a ;ka;=j èjks udk fmÜáhla u; kexjq úg jeä yfâ ierla we;sfõ' fuh meyeos,s lrkak' (c) fofl,jßka wp,j iúlrk ,o ;ka;=jla uq,slfhka lïmkh úug i,iajhs' ;ka;=j u; msysá wxY=jl ;ajrKh a wxY=fõ isria úia:dmkh y iu. úp,Hh' a = -400  2 y u.ska fokq ,efí (i)

;ka;=j lïmkh jk ixLHd;h fldmuKo@

(ii)

;ka;=j tys uq,slfhka lïmkh fõ kï o ld,h t= 0 os y tys Wmßu w.fha mj;s kï o my; i|yka tla tla ld,j,oS ;ka;=fõ msysáï we| fmkajkak' (1) t=0

(2) t =

1 s 40

(3) t =

1 s 20

(4) t =

3 s 40

(d) by; ;ka;=fõ iómfha i¾jiu ;j;a ;ka;=jla we;' ;ka;= fol uq,slfhka fm,su ksid 2 Hz kq.eiqï ixLHd;hlaa we;s ùug fojk ;ka;=fõ wd;;sh jeäl, hq;= m%;sY;h fidhkak'

03' (a) wjê fldaKh hkafkka woyia lrkafka l=ulaoehs meyeos,s lrkak' (b) wdf,dal lsrKhla mq¾K wNHka;r mrdj¾;kh úu i|yd imqrd,sh hq;= wjYH;d i|yka lrkak'

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(c) rEmfha wdldrhg wdf,dal lsrKhlaa m%ldY ;ka;=jla u; jd;fha isg 0o, 20o, yd 40o hk fldaK j,ska m;kh fõ' m%ldY ;ka;=j idod we;s øjHfha j¾;kdxlh 1.5 la jk w;r m%ldY ;ka;=j jgd j¾;kdxlh 1.4 la jq mdr oDYH øjH ia:rhlska wdjrKh lr we;' m%ldY ;ka;=j idod we;s øjH A f,i;a ta jgd we;s øjH B f,i;a kï lr we;'

I

A yd B udOH fol w;r wjê fldaKfha w.h fidhkak

II.

C lsrKh m%ldY ;ka;=jg we;=¨ jq miq tu lsrKh m%ldY ;ka;=fõ A yd B w;=reuqK; olajd .uka .kakd wdldrh fmkaùu i|yd lsrKfha .uka m:h weo fmkajkak' tu lsrKh AB w;=reuqK; u; m;k fldaKh i3 f,i ,l=Kq lrkak

III.

i2 yd i3 fldaKj, w.h fidhkak

IV.

C lsrKh AB w;=reuqK; u; jeosfuka miq tys .uka ud¾.h fmkaúug by; wosk ,o lsrK igyk oslalrkak'

V.

m%ldY ;ka;=jla u; rEmfha mßos m;kh jk wdf,dal lsrKhla m%ldY ;ka;=j osf.a .uka lr wfkla fl,jßka msgúu i|yd m;k fldaKhg ;sìh yels Wmßu w.h .Kkh lrkak'

04'(a) whsia u; isákakd jq fmka.=hska flfkl=f.a mdofha m;=f,a mDIaÀl j¾.M,h 0.005 m2 jk w;r W!f.a mdo WIaK;ajh -10oC ys we;s whsia iu. fydo ;dm iam¾Ylhla we;' W!f.a mdofha reêr jdyskS fmd%;djh fidhkak II.

fuu .,dhk ;dmh u.ska whsia osh úh yels Wmßu iS>%;djh fidhkak'

^whsiaj, ú';d'Od' 2100 J kg-1 k-1 " whsiaj, ú,hkfha úYsIag .=ma; ;dmh 336 kJ kg-1& (b)

I.

mßir WIaK;ajh -10o C jk wjia:dfõ oS fmdl=Kl c,h ñoSu ksid c,h u;=msg 5 cm >klï whsia ;Ügqjla iEos ;snqKs' tu fudfydf;a oS whsia ;Ügqfõ >klu jeäjk iS>%;djh fidhkak' c,fha WIaK;ajh 0oC ys mj;S hhs i,lkak 3

II.

tu is>%;djfhkau c,h ñfoa hhs i,ld tla osklg miq whsia ;Ügqfõ >klu fidhkak

III.

tla osklg miq whsia ;Ügqfõ >klu by; .Kkh l< w.hg yßhgu iudk fõo@ fya;= meyeos,s lrkak' ^whsiaj, ;dm ikakdhl;dj 1.6 W m-1K-1 " whsiaj, >k;ajh 920 kgm-3 &

(c)

tu m%foaYfha csj;ajk mqoa.,fhl= ;u ksji ;=, iS;f,ka wdrCId ù isáu i|yd rEmfha mßos ksjfia ì;a;s ;kd we;' tkï 8 cm ne.ska jk .fvd,a neñ follska yd ta w;r jq 5 cm >klu jd; l=yrhlska iukaú; jk mßosh' Tyq ldurfha WIaK;ajfha 20oC ys mj;ajd .kS kï ì;a;sfha tall j¾.M,hlaa yryd msg;g ;dmh .,dhk is>%;djh fidhkak'

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