Page 1 Series : OSR/I +dT=i. Roll No. --)-i ilil*". 55lll3 EdGgRilsrs.{q-yB .r{si?[sTflari r Candidates must write the Code on the title page of the answer-book. o grr-infr'-q q;rii flo.gs qsr-rrt Efffi gu 15 t r o trFr-Er it qrlri aE ftt et{ flqq rq stsqq{ st or* s+r_glwor *Bq_yBq{ furi r o Srr-rn dq q-r .i t*'gq q*r-rr i[ SO ss{ t r o SlrITrFrqT vrrfrrrqrvJFqrr++q6*, qT{6,Ts'qi{. wEyqfu} r o E{t qFT-Et *t Td+ + ldq 1S 1qo EFr {Fl-ir tqqprqr t r qw-q{ er fuatq Wiqq ii t O. t S qi t*qr qr+'n I 10.15 qq t 10.30 qQ ro or* *-*e qq;r-rr si qilri .fu E{i fiqfrr + +{T a srr-glw+r w qil$ sm roT fui,i r o Please check that this question paper contains 15 printed pages. o Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. o Please check that this question paper contains 30 questions. o Please write down the Serial Number of the question before attempting it. o 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. snfro,^funmCffins) PHYSICS (Theory) fidfril4q :3 â‚¬itl t qrwdq aio :70 Timeallowed:3hoursJ [MaximumMarks:70 qrqsqfq+sr; (i) wfiywetffit t (ii) wsnlwtyaso rfl{d' tw t da a-rlsw otfu-algg;f,r}q r+qd-ar)rneb-<ra iiqw* r (iii) wr 9 dff d vdqvw qt aiqw *, yw tg d zz t sdqsfr dfr oiâ‚¬w iaEr yw 2s d so if sAqs?a ftq iiqw t r (iv) dTr d*t dtd wif C d qer1â‚¬ wqtfTdm * I (v) n,rurr il wqt q-{. 6H fu zat * I dEtfu, ql ei6t qtd W wr 4 dTpiof ard W vwif sidr?fu ffi*Idd?if-wif t etrafuqwyq+fuqTTqrt / dder+ t eilwl frdqd qwf t d*Td g'oyFrf *rar* t 5511t3 I 1p.T.O. Page 2 Series : OSR/I +dT=i. Roll No. --)-i ilil*". 55lll3 EdGgRilsrs.{q-yB .r{si?[sTflari r Candidates must write the Code on the title page of the answer-book. o grr-infr'-q q;rii flo.gs qsr-rrt Efffi gu 15 t r o trFr-Er it qrlri aE ftt et{ flqq rq stsqq{ st or* s+r_glwor *Bq_yBq{ furi r o Srr-rn dq q-r .i t*'gq q*r-rr i[ SO ss{ t r o SlrITrFrqT vrrfrrrqrvJFqrr++q6*, qT{6,Ts'qi{. wEyqfu} r o E{t qFT-Et *t Td+ + ldq 1S 1qo EFr {Fl-ir tqqprqr t r qw-q{ er fuatq Wiqq ii t O. t S qi t*qr qr+'n I 10.15 qq t 10.30 qQ ro or* *-*e qq;r-rr si qilri .fu E{i fiqfrr + +{T a srr-glw+r w qil$ sm roT fui,i r o Please check that this question paper contains 15 printed pages. o Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. o Please check that this question paper contains 30 questions. o Please write down the Serial Number of the question before attempting it. o 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. snfro,^funmCffins) PHYSICS (Theory) fidfril4q :3 â‚¬itl t qrwdq aio :70 Timeallowed:3hoursJ [MaximumMarks:70 qrqsqfq+sr; (i) wfiywetffit t (ii) wsnlwtyaso rfl{d' tw t da a-rlsw otfu-algg;f,r}q r+qd-ar)rneb-<ra iiqw* r (iii) wr 9 dff d vdqvw qt aiqw *, yw tg d zz t sdqsfr dfr oiâ‚¬w iaEr yw 2s d so if sAqs?a ftq iiqw t r (iv) dTr d*t dtd wif C d qer1â‚¬ wqtfTdm * I (v) n,rurr il wqt q-{. 6H fu zat * I dEtfu, ql ei6t qtd W wr 4 dTpiof ard W vwif sidr?fu ffi*Idd?if-wif t etrafuqwyq+fuqTTqrt / dder+ t eilwl frdqd qwf t d*Td g'oyFrf *rar* t 5511t3 I 1p.T.O. (vi) #d$der# vqqh a7 oryp 16? * r dqrfu qF erwqq al dl eflq @q svot w qqir6rn.6-4f, r (vii) qai ernvqq al enq ffiafuil ,tfuT fuqdiq;t n qr+t w sqqlq ar s+-d f , c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Po:4nx l0*7TmA-l 1 -;-:9 x 109 Nm2 C-2 +Trto m.:9'1 x 10-31 kg General Instructions : (i) All questions are compulsory. (ii) There are 30 questions in total. Question Nos. I to I are very short answer type questions ond caruy one mark each. (iii) Question Nos. 9 to 18 carry two mqrl{s each. Question Nos. 19 to 27 carry three marks each and question nos. 28 to 30 carryJive marks each. (iv) One of the questions carrying three marks weightage is value based question. (v) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marlrs and all three questions ofJive marl{s each weightage. You have to attempt only one of the choices in such questions. (vt) Use of calculators is not permitted. However, you may use log tables if necessary. (vii) You may use the following values of physical constants wherever necessary : c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Vr:4nx 10-7TmA-l I -: 9 x lge Nm2 C-2 4neo m.:9'1 x 10-31 kg 55nt3 2 Page 3 Series : OSR/I +dT=i. Roll No. --)-i ilil*". 55lll3 EdGgRilsrs.{q-yB .r{si?[sTflari r Candidates must write the Code on the title page of the answer-book. o grr-infr'-q q;rii flo.gs qsr-rrt Efffi gu 15 t r o trFr-Er it qrlri aE ftt et{ flqq rq stsqq{ st or* s+r_glwor *Bq_yBq{ furi r o Srr-rn dq q-r .i t*'gq q*r-rr i[ SO ss{ t r o SlrITrFrqT vrrfrrrqrvJFqrr++q6*, qT{6,Ts'qi{. wEyqfu} r o E{t qFT-Et *t Td+ + ldq 1S 1qo EFr {Fl-ir tqqprqr t r qw-q{ er fuatq Wiqq ii t O. t S qi t*qr qr+'n I 10.15 qq t 10.30 qQ ro or* *-*e qq;r-rr si qilri .fu E{i fiqfrr + +{T a srr-glw+r w qil$ sm roT fui,i r o Please check that this question paper contains 15 printed pages. o Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. o Please check that this question paper contains 30 questions. o Please write down the Serial Number of the question before attempting it. o 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. snfro,^funmCffins) PHYSICS (Theory) fidfril4q :3 â‚¬itl t qrwdq aio :70 Timeallowed:3hoursJ [MaximumMarks:70 qrqsqfq+sr; (i) wfiywetffit t (ii) wsnlwtyaso rfl{d' tw t da a-rlsw otfu-algg;f,r}q r+qd-ar)rneb-<ra iiqw* r (iii) wr 9 dff d vdqvw qt aiqw *, yw tg d zz t sdqsfr dfr oiâ‚¬w iaEr yw 2s d so if sAqs?a ftq iiqw t r (iv) dTr d*t dtd wif C d qer1â‚¬ wqtfTdm * I (v) n,rurr il wqt q-{. 6H fu zat * I dEtfu, ql ei6t qtd W wr 4 dTpiof ard W vwif sidr?fu ffi*Idd?if-wif t etrafuqwyq+fuqTTqrt / dder+ t eilwl frdqd qwf t d*Td g'oyFrf *rar* t 5511t3 I 1p.T.O. (vi) #d$der# vqqh a7 oryp 16? * r dqrfu qF erwqq al dl eflq @q svot w qqir6rn.6-4f, r (vii) qai ernvqq al enq ffiafuil ,tfuT fuqdiq;t n qr+t w sqqlq ar s+-d f , c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Po:4nx l0*7TmA-l 1 -;-:9 x 109 Nm2 C-2 +Trto m.:9'1 x 10-31 kg General Instructions : (i) All questions are compulsory. (ii) There are 30 questions in total. Question Nos. I to I are very short answer type questions ond caruy one mark each. (iii) Question Nos. 9 to 18 carry two mqrl{s each. Question Nos. 19 to 27 carry three marks each and question nos. 28 to 30 carryJive marks each. (iv) One of the questions carrying three marks weightage is value based question. (v) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marlrs and all three questions ofJive marl{s each weightage. You have to attempt only one of the choices in such questions. (vt) Use of calculators is not permitted. However, you may use log tables if necessary. (vii) You may use the following values of physical constants wherever necessary : c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Vr:4nx 10-7TmA-l I -: 9 x lge Nm2 C-2 4neo m.:9'1 x 10-31 kg 55nt3 2 1. 2. ffi qreroit sTrivr q6dt t qq{ren'r +1qfo{qr frfuq $kqremt rdrkd qrr t w* +iaiq sr Bdq eifqq r Define the term 'drift velocity' of charge carriers in a conductor and write its relationship with the current flowing through it. ffi t*o- +1qm-+.n{rr *} qs lltrrafffi foqr rrqr t : C(t) : 3 sin (8 nt) volt 1.5 m(t) Etâ‚¬if qrSET ilirr qfliq ergvn+tte,i ilr'r t I frgtr{ qf,sim.f,m +ifqq r The carrier wave of a signal is given by C(t) : 3 sin (8zrt) volt. The modulating signal is a square wave as shown. Find its modulation index. 1.5 m(t) in volt t in second gqdq qh B fr +'r V t rrfuqrr ffi sTra{r * onur dtâ‚¬-s 3e-"iq qn F *fuq qiwr 6q tf aq*t* | ys gq*iq qh *t flqvn Hr t z Write the expression, in a vector form, for the Lorentz magnetic force F due to a charge moving with velocity V in a magnetic field B. Wfrut is the direction of the magnetic force ? qqr{ caAs +frq qRr orY{*â‚¬dr *.+q fr-trtur *t qfli+ *.fuq qrq.dfuq t Plot a graph showing variation of current versus voltage for the material GaAs. 5. ffi ct-o ?t( si ffi qq-o-e q{"r + {qS it ror rrqr t r e$ {i*${ *. ere{ w {qiq-{ t 20 cm$ w furd ffi fl+5tsf, fuq qr qfrkEq sfr fuq +ffi t r its 6t st-ns qt frr tr I A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ? J. 4. 55/U3 lP.T.O. Page 4 Series : OSR/I +dT=i. Roll No. --)-i ilil*". 55lll3 EdGgRilsrs.{q-yB .r{si?[sTflari r Candidates must write the Code on the title page of the answer-book. o grr-infr'-q q;rii flo.gs qsr-rrt Efffi gu 15 t r o trFr-Er it qrlri aE ftt et{ flqq rq stsqq{ st or* s+r_glwor *Bq_yBq{ furi r o Srr-rn dq q-r .i t*'gq q*r-rr i[ SO ss{ t r o SlrITrFrqT vrrfrrrqrvJFqrr++q6*, qT{6,Ts'qi{. wEyqfu} r o E{t qFT-Et *t Td+ + ldq 1S 1qo EFr {Fl-ir tqqprqr t r qw-q{ er fuatq Wiqq ii t O. t S qi t*qr qr+'n I 10.15 qq t 10.30 qQ ro or* *-*e qq;r-rr si qilri .fu E{i fiqfrr + +{T a srr-glw+r w qil$ sm roT fui,i r o Please check that this question paper contains 15 printed pages. o Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. o Please check that this question paper contains 30 questions. o Please write down the Serial Number of the question before attempting it. o 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. snfro,^funmCffins) PHYSICS (Theory) fidfril4q :3 â‚¬itl t qrwdq aio :70 Timeallowed:3hoursJ [MaximumMarks:70 qrqsqfq+sr; (i) wfiywetffit t (ii) wsnlwtyaso rfl{d' tw t da a-rlsw otfu-algg;f,r}q r+qd-ar)rneb-<ra iiqw* r (iii) wr 9 dff d vdqvw qt aiqw *, yw tg d zz t sdqsfr dfr oiâ‚¬w iaEr yw 2s d so if sAqs?a ftq iiqw t r (iv) dTr d*t dtd wif C d qer1â‚¬ wqtfTdm * I (v) n,rurr il wqt q-{. 6H fu zat * I dEtfu, ql ei6t qtd W wr 4 dTpiof ard W vwif sidr?fu ffi*Idd?if-wif t etrafuqwyq+fuqTTqrt / dder+ t eilwl frdqd qwf t d*Td g'oyFrf *rar* t 5511t3 I 1p.T.O. (vi) #d$der# vqqh a7 oryp 16? * r dqrfu qF erwqq al dl eflq @q svot w qqir6rn.6-4f, r (vii) qai ernvqq al enq ffiafuil ,tfuT fuqdiq;t n qr+t w sqqlq ar s+-d f , c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Po:4nx l0*7TmA-l 1 -;-:9 x 109 Nm2 C-2 +Trto m.:9'1 x 10-31 kg General Instructions : (i) All questions are compulsory. (ii) There are 30 questions in total. Question Nos. I to I are very short answer type questions ond caruy one mark each. (iii) Question Nos. 9 to 18 carry two mqrl{s each. Question Nos. 19 to 27 carry three marks each and question nos. 28 to 30 carryJive marks each. (iv) One of the questions carrying three marks weightage is value based question. (v) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marlrs and all three questions ofJive marl{s each weightage. You have to attempt only one of the choices in such questions. (vt) Use of calculators is not permitted. However, you may use log tables if necessary. (vii) You may use the following values of physical constants wherever necessary : c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Vr:4nx 10-7TmA-l I -: 9 x lge Nm2 C-2 4neo m.:9'1 x 10-31 kg 55nt3 2 1. 2. ffi qreroit sTrivr q6dt t qq{ren'r +1qfo{qr frfuq $kqremt rdrkd qrr t w* +iaiq sr Bdq eifqq r Define the term 'drift velocity' of charge carriers in a conductor and write its relationship with the current flowing through it. ffi t*o- +1qm-+.n{rr *} qs lltrrafffi foqr rrqr t : C(t) : 3 sin (8 nt) volt 1.5 m(t) Etâ‚¬if qrSET ilirr qfliq ergvn+tte,i ilr'r t I frgtr{ qf,sim.f,m +ifqq r The carrier wave of a signal is given by C(t) : 3 sin (8zrt) volt. The modulating signal is a square wave as shown. Find its modulation index. 1.5 m(t) in volt t in second gqdq qh B fr +'r V t rrfuqrr ffi sTra{r * onur dtâ‚¬-s 3e-"iq qn F *fuq qiwr 6q tf aq*t* | ys gq*iq qh *t flqvn Hr t z Write the expression, in a vector form, for the Lorentz magnetic force F due to a charge moving with velocity V in a magnetic field B. Wfrut is the direction of the magnetic force ? qqr{ caAs +frq qRr orY{*â‚¬dr *.+q fr-trtur *t qfli+ *.fuq qrq.dfuq t Plot a graph showing variation of current versus voltage for the material GaAs. 5. ffi ct-o ?t( si ffi qq-o-e q{"r + {qS it ror rrqr t r e$ {i*${ *. ere{ w {qiq-{ t 20 cm$ w furd ffi fl+5tsf, fuq qr qfrkEq sfr fuq +ffi t r its 6t st-ns qt frr tr I A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ? J. 4. 55/U3 lP.T.O. 6. ++ ffi qrr+.{tqrqcnqT sr ffiE sTi{q t{qr.rqr t rx' ERT ilqih.fr orErirq + reqrlqq qY{{ssr q.r{ frfuq I qffirqtd frN, ru,* frmo* The figure given below shows the block diagram of a generalized communication system. Identifu the element labelled 'X' and write its function. I lnformation Source i-rrgug,:Er---- -R3c-e1vgr--l Message Signal Message Signal 7. HITH {rrg +Ei rfd-6; Mt \1*. qq sr f,en ESn *iq HT t Um Fq t sqn ffit T.fi qr tnrq q-i t r r+i t q+-{ qrrt('r$ rntr T{ Tâ‚¬,d qgtm et{ Fii r Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why ? ..m ,fr oTrn{r kqrs +'frq, ffi tq-â‚¬ t .fw1i E{l-(,rT, TrqBqq yB f{qd qiT + E]_dr t r" g{ 6e6 *t glqsifqq , "For any charge configuration, equipotential surface through a point is normal to the electric field." Justify. 1 cm cqr{"+ffi Aqd fr-{q of we ffi q+.sqn frqil q+-{ ii qq q-sr{rerr qrff t, frW cil s{qr t* t oo' q.1 6iur omrq, ir-tr {6 tdqq orF N* * eo qq"t q.r sr$re o-rcn t r qk tat{d qr sTra{r + 2 nC t Hi Wftt furfuq Eqt qfit*fud +ilqq r An electric dipole of length I with its axis making an angle of 60o 8. 9. An electric dipole of length I cm, which placed with its axis making an angle of 60o with uniform electric field, experiences a torque of 6\F Nm. Calculate the potential energy of the dipole if it has charge + 2 nC. 55llt3 4 wqhT- m..df Page 5 Series : OSR/I +dT=i. Roll No. --)-i ilil*". 55lll3 EdGgRilsrs.{q-yB .r{si?[sTflari r Candidates must write the Code on the title page of the answer-book. o grr-infr'-q q;rii flo.gs qsr-rrt Efffi gu 15 t r o trFr-Er it qrlri aE ftt et{ flqq rq stsqq{ st or* s+r_glwor *Bq_yBq{ furi r o Srr-rn dq q-r .i t*'gq q*r-rr i[ SO ss{ t r o SlrITrFrqT vrrfrrrqrvJFqrr++q6*, qT{6,Ts'qi{. wEyqfu} r o E{t qFT-Et *t Td+ + ldq 1S 1qo EFr {Fl-ir tqqprqr t r qw-q{ er fuatq Wiqq ii t O. t S qi t*qr qr+'n I 10.15 qq t 10.30 qQ ro or* *-*e qq;r-rr si qilri .fu E{i fiqfrr + +{T a srr-glw+r w qil$ sm roT fui,i r o Please check that this question paper contains 15 printed pages. o Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. o Please check that this question paper contains 30 questions. o Please write down the Serial Number of the question before attempting it. o 15 minutes time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. snfro,^funmCffins) PHYSICS (Theory) fidfril4q :3 â‚¬itl t qrwdq aio :70 Timeallowed:3hoursJ [MaximumMarks:70 qrqsqfq+sr; (i) wfiywetffit t (ii) wsnlwtyaso rfl{d' tw t da a-rlsw otfu-algg;f,r}q r+qd-ar)rneb-<ra iiqw* r (iii) wr 9 dff d vdqvw qt aiqw *, yw tg d zz t sdqsfr dfr oiâ‚¬w iaEr yw 2s d so if sAqs?a ftq iiqw t r (iv) dTr d*t dtd wif C d qer1â‚¬ wqtfTdm * I (v) n,rurr il wqt q-{. 6H fu zat * I dEtfu, ql ei6t qtd W wr 4 dTpiof ard W vwif sidr?fu ffi*Idd?if-wif t etrafuqwyq+fuqTTqrt / dder+ t eilwl frdqd qwf t d*Td g'oyFrf *rar* t 5511t3 I 1p.T.O. (vi) #d$der# vqqh a7 oryp 16? * r dqrfu qF erwqq al dl eflq @q svot w qqir6rn.6-4f, r (vii) qai ernvqq al enq ffiafuil ,tfuT fuqdiq;t n qr+t w sqqlq ar s+-d f , c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Po:4nx l0*7TmA-l 1 -;-:9 x 109 Nm2 C-2 +Trto m.:9'1 x 10-31 kg General Instructions : (i) All questions are compulsory. (ii) There are 30 questions in total. Question Nos. I to I are very short answer type questions ond caruy one mark each. (iii) Question Nos. 9 to 18 carry two mqrl{s each. Question Nos. 19 to 27 carry three marks each and question nos. 28 to 30 carryJive marks each. (iv) One of the questions carrying three marks weightage is value based question. (v) There is no overall choice. However, an internal choice has been provided in one question of two marks, one question of three marlrs and all three questions ofJive marl{s each weightage. You have to attempt only one of the choices in such questions. (vt) Use of calculators is not permitted. However, you may use log tables if necessary. (vii) You may use the following values of physical constants wherever necessary : c:3 x 108 m/s h: 6.63 x 10-34 Js e: 1.6 x 10-19 C Vr:4nx 10-7TmA-l I -: 9 x lge Nm2 C-2 4neo m.:9'1 x 10-31 kg 55nt3 2 1. 2. ffi qreroit sTrivr q6dt t qq{ren'r +1qfo{qr frfuq $kqremt rdrkd qrr t w* +iaiq sr Bdq eifqq r Define the term 'drift velocity' of charge carriers in a conductor and write its relationship with the current flowing through it. ffi t*o- +1qm-+.n{rr *} qs lltrrafffi foqr rrqr t : C(t) : 3 sin (8 nt) volt 1.5 m(t) Etâ‚¬if qrSET ilirr qfliq ergvn+tte,i ilr'r t I frgtr{ qf,sim.f,m +ifqq r The carrier wave of a signal is given by C(t) : 3 sin (8zrt) volt. The modulating signal is a square wave as shown. Find its modulation index. 1.5 m(t) in volt t in second gqdq qh B fr +'r V t rrfuqrr ffi sTra{r * onur dtâ‚¬-s 3e-"iq qn F *fuq qiwr 6q tf aq*t* | ys gq*iq qh *t flqvn Hr t z Write the expression, in a vector form, for the Lorentz magnetic force F due to a charge moving with velocity V in a magnetic field B. Wfrut is the direction of the magnetic force ? qqr{ caAs +frq qRr orY{*â‚¬dr *.+q fr-trtur *t qfli+ *.fuq qrq.dfuq t Plot a graph showing variation of current versus voltage for the material GaAs. 5. ffi ct-o ?t( si ffi qq-o-e q{"r + {qS it ror rrqr t r e$ {i*${ *. ere{ w {qiq-{ t 20 cm$ w furd ffi fl+5tsf, fuq qr qfrkEq sfr fuq +ffi t r its 6t st-ns qt frr tr I A convex lens is placed in contact with a plane mirror. A point object at a distance of 20 cm on the axis of this combination has its image coinciding with itself. What is the focal length of the lens ? J. 4. 55/U3 lP.T.O. 6. ++ ffi qrr+.{tqrqcnqT sr ffiE sTi{q t{qr.rqr t rx' ERT ilqih.fr orErirq + reqrlqq qY{{ssr q.r{ frfuq I qffirqtd frN, ru,* frmo* The figure given below shows the block diagram of a generalized communication system. Identifu the element labelled 'X' and write its function. I lnformation Source i-rrgug,:Er---- -R3c-e1vgr--l Message Signal Message Signal 7. HITH {rrg +Ei rfd-6; Mt \1*. qq sr f,en ESn *iq HT t Um Fq t sqn ffit T.fi qr tnrq q-i t r r+i t q+-{ qrrt('r$ rntr T{ Tâ‚¬,d qgtm et{ Fii r Two spherical bobs, one metallic and the other of glass, of the same size are allowed to fall freely from the same height above the ground. Which of the two would reach earlier and why ? ..m ,fr oTrn{r kqrs +'frq, ffi tq-â‚¬ t .fw1i E{l-(,rT, TrqBqq yB f{qd qiT + E]_dr t r" g{ 6e6 *t glqsifqq , "For any charge configuration, equipotential surface through a point is normal to the electric field." Justify. 1 cm cqr{"+ffi Aqd fr-{q of we ffi q+.sqn frqil q+-{ ii qq q-sr{rerr qrff t, frW cil s{qr t* t oo' q.1 6iur omrq, ir-tr {6 tdqq orF N* * eo qq"t q.r sr$re o-rcn t r qk tat{d qr sTra{r + 2 nC t Hi Wftt furfuq Eqt qfit*fud +ilqq r An electric dipole of length I with its axis making an angle of 60o 8. 9. An electric dipole of length I cm, which placed with its axis making an angle of 60o with uniform electric field, experiences a torque of 6\F Nm. Calculate the potential energy of the dipole if it has charge + 2 nC. 55llt3 4 wqhT- m..df 10. ll. Hrrw}qr sI W futril fufuq | {iqtq ii Bdq *1Frq flq.gs qsfr{ sr uq+r oTrafrrd suii ant sq 6qt *.fuqdftd m.rt il fus rr+rfu'qr qror t I 2 State the underlying principle of a cyclotron. Write briefly how this machine is used to accelerate charged particles to high energies. q{iq q-{srffi qfrw tf ac t{ * qtPT *urtrq it {qrk{ 'C', qfiffi qftrftrs.'R'nsT stt E[iEr 'B' {qifud t r caq gE qFE * qrq qfiilr t r qk (D qftrftr*. n *} sqrq {GrrF-{, {qriu +i qfg-sreTt +Etq st$ Ttr+W qp*.r rs fi qrq, (iD qrfudr *} qqm GF{ qfrrftrs n tigk6{qt "Trq, H}{Gstqqoiiwrqfirqfqtt'n r 2 A capacitor'C', a variable resistor 'R' and a bulb 'B' are connected in series to the ac mains in circuit as shown. The bulb glows with some brightness. How will the glow of the bulb change if (i) a dielectric slab is introduced between the plates of the capacitor, keeping resistance R to be the same; (ii) the resistance R is increased keeping the same capacitance ? rz. t*-$ qq}{q srt{frffi}trur mor *t qqn frrl-d t dkd flsqr rqr t I gt Ait if t (1) ffi ricq ae-qrrffi dirr+{ "il rrFr 3rFr+,"Et'n, *{ (2) ffirlkqs"ioqEtrfr ?q-wrftlfrq t 2 A dbuteron and an alpha particle are accelerated with the same accelerating potential. Which one of the two has (1) greater value of de-Broglie wavelength, associated with it and (2) less kinetic energy ? Explain. 13. qt BE-dq Eqlqi ii t 'A' dr sTrEiqr$. gE-dyhffir qs. t g;.o erfrro t, q-qls. 'B' ftt qs't *-q t | 'A' eil{ 'g' qqnfr 61}r5ia qEqrfrq r qq qqrqT 6i gq*iq qqfu q-apm*.ffi 3pr+r TUIIcrffi'? 2 Out of the two magnetic materials, 'A' has relative permeability slightly greater than unity while 'B' has less than unity. Identify the nature of the materials 'A' and 'B'. Will their susceptibilities be positive or negative ? 55lll3 lP.T.O.Read More

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