ekwmy Á u&i= lsv& II fo k; & HkkSfrd fokku Subject- PHYSICS GENERAL INSTRUCTIONS : - PDF

ekwmy Á u&i= lsv& II fo k; & HkkSfrd fokku Subject- PHYSICS Total No. of questions 20 Full Marks 70 Pass Marks 23 Time 3Hrs. GENERAL INSTRUCTIONS : All questions are compulsory. Candidates are required

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ekwmy Á u&i= lsv& II fo k; & HkkSfrd fokku Subject- PHYSICS Total No. of questions 20 Full Marks 70 Pass Marks 23 Time 3Hrs. GENERAL INSTRUCTIONS : All questions are compulsory. Candidates are required to give their answers in their own words, as far as practicable. Q.No. 1 has 15 objective questions, each of 1 Mark. Q.No. 2 to 9 are very short answer type questions, each of 2 Marks. Q.No. 10 to 17 are short answer type questions, each of 3 Marks. Q.No. 18 to 20 are long answer type questions, each of 5 Marks. Marks distribution for different parts of a question are shown in the margin. lkeku; funsz k lhkh Á u vfuok;z gsaa ijh{kkfkê ;FkklEHko vius 'kcnksa esa mùkj nsaa Á u la[;k ¼1½ esa 15 olrqfu b Á u ¼ÁR;sd,d vad dk½ gsa lgh fodyi pqusaa Á u la[;k ¼2½ ls ¼9½ rd ÁR;sd Á u nks vadksa dk gsa Á u la[;k ¼10½ ls ¼17½ rd ÁR;sd Á u rhu vadksa dk gsa Á u la[;k ¼18½ ls ¼20½ rd ÁR;sd Á u ik p vadksa dk gsa ÁR;sd Á u ds mijkur esa vadksa dk fooj.k n kkz;k x;k gsa GROUP A 1 X 15 = (i) When a body is charged, its mass (a) increases (b) decreases (c) remains constant (d) may increase or decrease. fdlh olrq dks vkosf kr djus ij bldh ek=k ¼a½ c + tkrh gs ¼b½?kV tkrh gs ¼c½ vifjofrzr jgrh gs ¼c½ c + ldrh gs vfkok?kv ldrh gsa (ii) The electric field inside a uniformly charged spherical shell is (a) zero (b) constant (c) decreases with distance (d) increases with distance. leku #i ls vkosf kr fdlh xksyh; dop ds vunj fo qr {ks= dk eku gksrk gs ¼a½ 'kwu; ¼b½ flfkj ¼c½ nwjh ds lkfk?kvrk gs ¼d½ nwjh ds lkfk c +rk gsa (iii) The capacity of a parallel plate condenser is 20µF. If the space between plates is filled with a dielectric of relative permittivity 4 then the capacity becomes (a) 5µF (b) 80µF (c) 0.2µF (d) 2.5µF. 1 fdlh lekurj iê la/kkfj= dh /kkfjrk 20 µf gsa ;fn iêksa ds chp dh txg,d ijkos qr ftldh vkisf{kd fo qr khyrk 4 gs] ls Hkj fn;k tk;s rks /kkfjrk gks tk;sxh (a) 5µF (b) 80µF (c) 0.2µF (d) 2.5µF. (iv) The resistance of a conductor does not depend upon (a) length of conductor (b) thickness of conductor (c) nature of material of conductor (d) nature of surroundings. fdlh pkyd dk izfrjks/k fueu esa ls fdl ij fuhkzj ugha djrk gs ¼a½ pkyd dh yeckbz ¼b½ pkyd dh eksvkbz ¼c½ pkyd ds inkfkz dh izd`fr ¼d½ ifjos k dh izd`fra (v) Kirchoff s point rule (junction rule) for electrical networks is a direct consequence of (a) law of conservation of energy (b) law of conservation of linear momentum (c) law of conservation of angular momentum (d) law of conservation of charge. tfvy ifji{kksa ds fy, fddzgkwq dk laf/k fu;e] fueu esa ls fdldh lh/kh ifj.kfr gs ¼a½ mtkz ds laj{k.k dk fu;e ¼b½ jsf[kd laosx ds laj{k.k dk fu;e ¼c½ dks.kh; laosx ds laj{k.k dk fu;e ¼d½ vkos k ds laj{k.k dk fu;ea (vi) The vector form of B-S-L law is B-S-L fu;e dk lfn k fu#i.k gs (a) B = µo i ( l)sin (b) B = µo i ( l X r ) 4π r 2 4π r 2 (c) B = µo i ( l X r ) (d) B = µo i ( l X r ) 4π r 3 4π r (vii) If R.M.S. value of A.C. is I then the peak value will be ;fn fdlh izr;koùkhz /kkjk dk ewy&ek/;&oxz eku I gs rks bldk f k[kj&eku gksxk (a) I (b) 2 I (c) I (d) 2 I 2 2 (viii) Which of the following e.m. wave has longest wave length. (a) x-ray (b) UV rays (c) IR rays (d) microwaves. fueu esa ls fdl fo qr&pqecdh; rjax dk rjaxns/;z vf/kdre gs ¼a½ X-fdj.k ¼b½ UV fdj.k ¼c½ I-R fdj.k ¼d½ ekbøksoshk (ix) An equiconvex lens of power P is cut into two equal halves by a plane perpendicular to its principal axis. The power of each half will be 2 P {kerk okys,d le mùky ysul dks v{k ds yecor~ ry }kjk nks leku Hkkxksa esa fohkdr dj fn;k tkrk gsa izr;sd Hkkx dh {kerk gksxh& (a) P (b) 2P (c) P (d) zero ('kwu;). 2 (x) If the critical angle for glass air interface is 45 o then refractive index of glass is ;fn dkap&gok vurjry ds fy, ØkfUrd dks.k dk eku 45 o gs rks dkap dk orzukad gksxk (a) 1.5 (b) 1.4 (c) 1.3 (d) 1.2 (xi) Which of the following phenomena establishes the transverse nature of light wave. (a) Interference (b) Diffraction (c) Total internal reflection (d) Polarization. fueu esa fdl?kvuk ds }kjk izdk k rjax ds vuqizlfk rjax gksus dh LFkkiuk gksrh gs ¼a½ O;frdj.k ¼b½ fooùkzu ¼c½ iw.kz vkurfjd ijkoùkzu ¼d½ /kzqo.k (xii) Photoelectric effect is observed when yellow light falls on a certain metal surface. The light which will not produce P.E. effect for the same metal is (a) Green (b) Blue (c) Violet (d) Orange. ;fn fdlh pkyd dh lrg ij ihyk izdk k im+us ij izdk k fo qrh; izhkko xkspj gksrk gs rks bl pkyd lrg ij fueu esa ls dksu izdk k izdk k&fo qrh; izhkko mriuu ugha dj ldrk ¼a½ gjk ¼b½ uhyk ¼c½ csaxuh ¼d½ ukjaxh (xiii) A radioactive material has half life of 10days. What fraction of material will remain undecayed after 30 days fdlh jsfm;ks/kehz inkfkz dh v)z&vk;q 10 fnu gsa 30 fnuksa ds i'pkr~ inkfkz dk dksu&lk Hkkx v{kkf;r jgsxk (a) 0.5 (b) 0.25 (c) (d) 0.33 (xiv) When phosphorus is added as an impurity to intrinsic semi-conductor we obtain. (a) p-type semiconductor (b) n-type semiconductor (c) either p-type or n-type semiconductor (d) a pure conductor. tc fdlh ust v)zpkyd esa vinzc; ds #i esa QkWlQksjl feyk;k tkrk gs rks fueu esa ls fdldh izkfir gksrh gsa ¼a½ p-vkbi v)zpkyd ¼b½ n-vkbi v)zpkyd ¼c½ p-vkbi v)zpkyd vfkok n-vkbi v)zpkyd ¼d½,d 'kq) pkyd 3 (xv) Zener diode is used for (a) producing oscillations (b) amplification (c) rectification (d) voltage stabilization. tsuj Mk;ksM ¼Hkatd Mk;ksM½ dk mi;ksx fueu esa ls fdl dk;z ds fy, fd;k tkrk gs ¼a½ nksyu mriuu djus esa ¼b½ lao)zu esa ¼c½ fn vdkjh ds #i esa ¼d½ fohko flfkj.k esa GROUP B 2 X 8 = Give two properties of an electric field line. (1+1) fo qr {ks= js[kk ds nks xq.kksa dk myys[k djsaa 3. What is drift-velocity? Write a formula connecting drift velocity & mobility. (1+1) laogu osx D;k gs \ laogu osx rfkk xfr khyrk ds chp laca/k ds fy,,d lw= fy[ksaa 4. What is B-S-L law? Write the expression for magnetic induction at the centre of a current carrying circular loop. (1+1) fu;e D;k gs \ fdlh fo qr /kkjk ;qdr o`rh; dqamyh ds dsunz ij pqecdh; {ks= ds fy, O;atd fy[ksaa 5. What is Lenz s law? On which conservation law it is based? (1+1) ysat dk fu;e D;k gs \ ;g fdl laj{k.k fl)kur ij vk/kkfjr gs \ 6. What are space waves and sky waves? (1+1) varfj{k rjax rfkk O;kse rjax D;k gs \ 7. What are different quantum no s.? (½+½+½+½) fofhkuu izdkj dh DokUVe la[;kvksa dk myys[k djsaa 8. Give the symbol for a p-n junction diode and mention one of its uses. (1+1) p-n laf/k Mk;ksM ds fy, vkjs[k [khaps rfkk blds fdlh,d mi;ksx dk myys[k djsaa 9. Give two reasons for modulation of a signal. (1+1) lwpuk&ladsr ds ekwmqyl dh vfuok;zrk ds nks dkj.k crk;saa 4 GROUP C 3 X 8 = Define capacity. Find the capacity of a parallel plate condenser. (1+2) /kkfjrk dh ifjhkk kk nsaa,d lekurj iê la/kkfj= dh /kkfjrk ds fy, O;atd izkir djsaa 11. What is resistivity or specific resistance? A wire of resistance R is cut into n equal parts and all these smaller parts are connected in parallel. Find the equivalent resistance. (1+1+1) Ikzfrjkspdrk vfkok fof k v izfrjks/k D;k gs \ R izfrjks/k ds,d rkj dks n NksVs&NksVs leku Hkkxksa esa fohkdr dj fn;k tkrk gsa ;fn lhkh Hkkxksa dks lekurj Øe esa tksm+ fn;k tk; rks rqy; izfrjks/k dh x.kuk djsaa 12. Define power of a lens. A lens of focal length 20 cm. is dipped into water. Find its power in water. ( µ w = 4/3 ; µ g = 3/2) (1+2) fdlh ysul dh {kerk ifjhkkf kr djsaa,d 20 cm. Qksdl nwjh okys ysul dks ikuh esa Mqck fn;k tkrk gsa bl ysul dh ikuh esa {kerk Kkr djsaa 13. What is dispersion? When a white ray of light passes through a prism it is dispersed, why? (1+2) fo{ksi.k D;k gs \ tc,d 'osr izdk k dh fdj.k fdlh fizte ls gksdj xqtjrh gs rks bldk fo{ksi.k gks tkrk gs] D;ksa \ 14. What do you mean by work function? The work function of a metal is 1.6ev. If a photon of energy 2ev is incident on it, find the maximum K.E. of ejected electron. (1+2) dk;z Qyu dk D;k rkri;z gs \ fdlh pkyd lrg dk dk;zqyu 1-6v ev gsa ;fn 2ev mtkz dk,d QksVksu bl lrg ij vkifrr gks rks foeqdr bysdvªkwu dh egùke xfrt mtkz dk eku Kkr djsaa 15. What do you understand by Mass defect and packing fraction? Distinguish between Isotopes & Isobars. (1+1+1) nzc;eku {kfr rfkk ca/ku fhkuu ¼packing fraction½ ls vki D;k le rs gsa \ lelfkkfud,oa lehkkfjd ds chp Hksn fy[ksaa 5 16. What is rectification? Draw a circuit diagram for p-n junction diode as full wave rectifier. (1+2) fn vdj.k D;k gs \ fdlh p-n laf/k Mk;ksM ds iw.kz rjax fn vdkjh ds #i esa mi;ksx dk ifji{k [khapsa 17. What is MODEM? The height of a TV tower is 80m. Find the maximum area upto which TV transmission can be received. (Radius of earth = 6.4 X 10 6 m) (1+2) eksmse D;k gs \ fdlh Vh0Hkh0 ehukj dh m pkbz 80m gsa ml vf/kdre {ks=qy dk eku Kkr djsa ftlesa Vh0Hkh0 ladsr izkir fd;s tk ldrs gsaa ¼i`Foh dh f=t;k ¾ 6.4 X 10 6 m½ GROUP D 5 X 3 = State Ampere s circuital law? Find magnetic field at a point inside a solenoid, using Ampere s circuit law. (2+3),fEi;j ds ifjifkh; fu;e dk myys[k djsaa bl fu;e dk mi;ksx djrs gq, fdlh /kkjk;qdr ifjukfydk ds vunj flfkr fcunq ij pqecdh; {ks= dk eku Kkr djsaa OR What is Fleming s left hand rule? Find a formula for magnetic force acting between two parallel current carrying conductors. Hence define Ampere. (1+3+1) ysfeax ds okeglr dk fu;e D;k gs \ nks lekurj /kkjk;qdr pkydksa ds chp dk;zjr pqecdh; cy ds fy,,d lw= dk izfriknu djsaa vr,o,fei;j dks ifjhkkf kr djsaa 19. What is equivalent lens? Find a formula for focal length of an equivalent lens for a system of two thin lenses in contact. Sun appears red at sunrise & sunset, why? (1+2+2) lerqy; ysul D;k gs \ nks irys ysul ;fn leidz esa gksa rks muds lerqy; ysul dh Qksdl nwjh ds fy,,d lw= Kkr djsaa izkr% dky,oa lk;adky esa lw;z yky fn[kkbz nsrk gs] dkj.k crk;saa OR What is Huygen s principle? Establish law of refraction using Huygen s principle. The thickness of a glass slab seems to be 4cm. when viewed normally. Find the real thickness of slab. (µ g = 1.5) (1+3+1) gkbxsu dk fl)kur D;k gs \ gkbxsu ds fl)kur ds vk/kkj ij izdk k ds vioùkzu ds fu;e dh LFkkiuk djsaa fdlh dk p dh ifêdk dh vkhkklh eksvkbz yecor~ n`f bikr djus ij 4cm gsa bldh oklrfod eksvkbz Kkr djsaa (µ g = 1.5) 6 20. What is power factor in A.C.? Calculate the true power dissipated in a circuit containing an inductance & resistance. A circuit consists of an inductance of 5mH, a capacitance of 4µF and a resistance of 20Ω. what is the impedance of circuit in resonance. (1+3+1) fdlh izr;korhz /kkjk ds ifjifk dk 'kfdr xq.kkad D;k gs \ fdlh izsjdro rfkk izfrjks/k ;qdr izr;korhz /kkjk ifjifk esa oklrfod vkslr 'kfdr ds {k; dk eku Kkr djsaa fdlh izr;korhz /kkjk ifjifk esa 5mH dk,d izsjdrro] 4 µf dh,d /kkfjrk,oa 20 Ω dk,d izfrjks/k la;qdr gsa vuqokn dh flfkfr esa ifjifk dh dqy izfrck/kk dk eku Kkr djsaa OR What is a transformer? On what principle a transformer works? Draw a schematic labeled diagram of a step-up transformer. Why the core of a transformer is laminated? ( ) VªkUlQkWeZj D;k gs \ ;g fdl fl)kur ij dk;z djrk gs \,d mppk;h VªkUlQWkeZj dk ukfer vkjs[k izlrqr djsa rfkk bldh dk;z iz.kkyh dh O;k[;k djsaa fdlh VªkUlQkWeZj dk ØksM ivfyr D;ksa cuk;k tkrk gs \ 7
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