Science Past Paper: 31(B) Science - Vision Impaired Candidates

Set-5 Series #CDBA àíZ-nÌ H$moS> Q.P. Code 31(B) amob Z§. narjmWu àíZ-nÌ H$moS> >H$mo CÎma-nwpñVH...

Set-5 Series #CDBA àíZ-nÌ H$moS> Q.P. Code 31(B) amob Z§. narjmWu àíZ-nÌ H$moS> >H$mo CÎma-nwpñVH$m Ho$ Roll No. _wI-n¥ð >na Adí` {bIo§ & Candidates must write the Q.P. Code on the title page of the answer-book. {dkmZ (Ho$db Ñ{ï>~m{YV narjm{W©`m| Ho$ {bE) SCIENCE (FOR VISUALLY IMPAIRED CANDIDATES ONLY) :3 : 80 Time allowed : 3 hours Maximum Marks : 80 ZmoQ> NOTE (I) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _o§ _w{ÐV (I) Please check that this question paper contains 31 printed pages. n¥ð> 31 h¢ & (II) H¥$n`m Om±M H$a b| {H$ Bg àíZ-nÌ _| (II) Please check that this question paper contains 39 questions. >39 àíZ h¢ & (III) àíZ-nÌ _| Xm{hZo hmW H$s Amoa {XE JE (III) Q.P. Code given on the right hand side of the question paper should be written on àíZ-nÌ H$moS >H$mo narjmWu CÎma-nwpñVH$m Ho$ the title page of the answer-book by the _wI-n¥ð> na {bI| & candidate. (IV) H¥$n`m àíZ H$m CÎma {bIZm ewê$ H$aZo go (IV) Please write down the serial number of the question in the answer-book before nhbo, CÎma-nwpñVH$m _| àíZ H$m H«$_m§H$ attempting it. Adí` {bI| & (V) Bg àíZ-nÌ 15 {_ZQ (V) 15 minute time has been allotted to read this question paper. The question paper >H$m g_` {X`m J`m h¡ & àíZ-nÌ H$m will be distributed at 10.15 a.m. From 10.15 ~Oo {H$`m OmEJm & 10.15 a.m. to 10.30 a.m., the students will 10.15 ~Oo go 10.30 ~Oo VH$ N>mÌ Ho$db read the question paper only and will not àíZ- write any answer on the answer-book during this period. do CÎma-nwpñVH$m na H$moB© CÎma Zht {bI|Jo & 11-31(B) 1 P.T.O.  : : (i) 39 (ii) (iii) 1 20 1 (iv) 21 26 2 30 50 (v) 27 33 3 50 80 (vi) 34 36 5 80 120 (vii) 37 39 3 4 (viii) IÊS> H$ 20 1 20 20 1=20 1. àH$me H$s EH$ {H$aU {H$gr g_Vb Xn©U na 15º Ho$ H$moU na AmnVZ H$a ahr h¡ & Bg {H$aU _| Xn©U Ûmam CËnÞ {dMbZ h¡ : (A) 30º (B) 60º (C) 120º (D) 150º 11-31(B) 2 General Instructions : Read the following instructions very carefully and strictly follow them : (i) This question paper comprises 39 questions. All questions are compulsory. (ii) This question paper is divided into five sections A, B, C, D and E. (iii) Section A Questions No. 1 to 20 are multiple choice questions. Each question carries 1 mark. (iv) Section B Questions No. 21 to 26 are very short answer type questions. Each question carries 2 marks. Answer to these questions should be in the range of 30 to 50 words. (v) Section C Questions No. 27 to 33 are short answer type questions. Each question carries 3 marks. Answer to these questions should in the range of 50 to 80 words. (vi) Section D Questions No. 34 to 36 are long answer type questions. Each question carries 5 marks. Answer to these questions should be in the range of 80 to 120 words. (vii) Section E Questions No. 37 to 39 are of 3 source-based/case- based units of assessment carrying 4 marks each with sub-parts. (viii) There is no overall choice. However, an internal choice has been provided in some sections. Only one of the alternatives has to be attempted in such questions. SECTION A This section has 20 multiple choice questions (Q. No. 1 20). 20 1=20 1. A ray of light is incident on a plane mirror at an angle of incidence of 15º. The deviation in the ray produced by the mirror is : (A) 30º (B) 60º (C) 120º (D) 150º 11-31(B) 3 P.T.O. 2. H$moB© CÎmb Xn©U {H$gr {~å~ H$m gX¡d hr EH$ à{V{~å~ ~ZmVm h¡, Omo hmoVm h¡ : (A) (B) Am^mgr, grYm Am¡a N>moQ>m (C) Am^mgr, CëQ>m Am¡a N>moQ>m (D) dmñV{dH$, grYm Am¡a N>moQ>m 3. 1 Am¡a 3 Ho$ Xmo à{VamoYH$ {H$gr n[anW _| nmíd© _|§ g§`mo{OV h¢ & `{X Bg n[anW go 1 Eopån`a H$s Ymam àdm{hV hmo ahr h¡, Vmo 3 Ho$ à{VamoYH$ go àdm{hV Ymam h¡ : (A) 1·0 Eopån`a (B) 0·75 Eopån`a (C) 0·33 Eopån`a (D) 0·25 Eopån`a 4. g_mZ YmVw Ho$ Xmo Vmam| H$s bå~mB`m± g_mZ h¢, naÝVw CZH$s AZwàñW-H$mQ>m| Ho$ joÌ\$bm| H$m AZwnmV 4 : 1 h¡ 20 h¡ & Bg g§`moOZ H$m Hw$b à{VamoY h¡ : (A) 25 (B) 100 (C) 16 (D) 340 11-31(B) 4 2. For an object, a convex mirror always forms an image which is : (A) Virtual, erect and magnified (B) Virtual, erect and diminished (C) Virtual, inverted and diminished (D) Real, erect and diminished 3. Two resistors of 1 and 3 are connected in parallel in a circuit. If a current of 1 ampere is flowing through the circuit, the current flowing through the 3 resistor is : (A) 1·0 ampere (B) 0·75 ampere (C) 0·33 ampere (D) 0·25 ampere 4. Two wires of same metal have the same length but their cross-sectional areas are in the ratio of 4 : 1. They are joined in series. The resistance of the thicker wire is 20. The total resistance of the combination is : (A) 25 (B) 100 (C) 16 (D) 340 11-31(B) 5 P.T.O. 5. ZrMo {XE JE H$WZm| na {dMma H$s{OE : i. nú_m^r no{e`m± ZoÌ _| àdoe H$aZo dmbo àH$me H$s Vrd«Vm H$mo g_m`mo{OV H$aVr h¢ & ii. {ZH$Q>ÑpîQ> Xmof `wº$ ZoÌ H$mo C{MV j_Vm Ho$ A{^gmar b|gm| Ûmam g§emo{YV {H$`m Om gH$Vm h¡ & iii. nwVbr H$m H$m`© ZoÌ _| àdoe H$aZo dmbo àH$me H$s _mÌm H$mo {Z`§{ÌV H$aZm h¡ & iv. O~ nú_m^r no{e`m± nyU©V: {e{Wb hmoVr h¢ V~ ZoÌ b|g H$s \$moH$g Xÿar A{YH$V_ hmoVr h¡ & BZ_| ghr H$WZ h¢ : (A) i, ii Am¡a iv (B) i, ii Am¡a iii (C) iii Am¡a iv (D) ii Am¡a iv 6. ZrMo {XE JE amgm`{ZH$ g_rH$aU na {dMma H$s{OE : p MnO2 + q Al r Mn + s Al2O3 Bg amgm`{ZH$ g_rH$aU H$mo g§Vw{bV H$aZo Ho$ {bE JwUm§H$m| p, q, r Am¡a s Ho$ _mZ H«$_e: hmoZo Mm{hE : (A) 3, 2, 3, 4 (B) 4, 3, 4, 2 (C) 3, 4, 3, 2 (D) 4, 2, 4, 3 7. {H$gr bdU Ho$ Obr` {db`Z Ho$ pH H$m _mZ 9 h¡ & `h bdU {Og àH$ma Ho$ Aåb Am¡a jmaH$ go ~Zm h¡, do h¢¡ : (A) Xþ~©b Aåb Am¡a Xþ~©b jmaH$ (B) Xþ~©b Aåb Am¡a à~b jmaH$ (C) à~b Aåb Am¡a Xþ~©b jmaH$ (D) à~b Aåb Am¡a à~b jmaH$ 11-31(B) 6 5. Consider the following statements : i. Ciliary muscles adjust for changing the intensity of light entering the eye. ii. Myopic eye can be corrected by converging lenses of suitable power. iii. The function of the pupil is to regulate the quantity of light entering the eye. iv. When ciliary muscles are completely relaxed, the focal length of the eye lens is maximum. The correct statements are : (A) i, ii and iv (B) i, ii and iii (C) iii and iv (D) ii and iv 6. Consider the following chemical equations : p MnO2 + q Al r Mn + s Al2O3 To balance this chemical equation the values of the coefficients p, q, r and s must be respectively : (A) 3, 2, 3, 4 (B) 4, 3, 4, 2 (C) 3, 4, 3, 2 (D) 4, 2, 4, 3 7. The pH of an aqueous solution of a salt is 9. The types of acid and base from which this salt is formed are : (A) weak acid and weak base (B) weak acid and strong base (C) strong acid and weak base (D) strong acid and strong base 11-31(B) 7 P.T.O. 8. AÊS>o H$s Imobm| H$s {H$gr {db`Z S go A{^{H«$`m H$amZo na H$moB© a§JhrZ J¡g G CËnÞ hmoVr h¡ & J¡g G MyZo Ho$ nmZr H$mo Xÿ{Y`m H$a XoVr h¡ & S Am¡a G H«$_e: h¢ : (A) H2SO4 Am¡a SO2 (B) HCl Am¡a SO2 (C) NaCl Am¡a CO2 (D) HCl Am¡a CO2 9. {ZåZ{b{IV _| go H$m¡Z-gr YmVw R>§S>o Ob go gdm©{YH$ g{H«$`Vm go A{^{H«$`m H$aVr h¡ ? (A) Eobw{_{Z`_ (B) nmoQ>¡{e`_ (C) gmo{S>`_ (D) H¡$pëe`_ 10. {H$gr hmBS´>moH$m~©Z H$m EH$ _mob dm`w _| XhZ hmoZo na CO2 Ho$ Xmo _mob, H2O Ho$ Xmo _mob VWm AË`{YH$ _mÌm _| D$î_m CËnÞ H$aVm h¡ & `h hmBS´>moH$m~©Z h¡ : (A) EWmBZ (B) EWrZ (C) EWoZ (D) _oWoZ 11. dh Ord Omo ^moÁ` nXmWm] H$m {dKQ>Z eara Ho$ ~mha hr H$a XoVm h¡ Am¡a {\$a Cgo Ademo{fV H$aVm h¡, H$m¡Z-gm h¡o ? (A) ~«¡S> _moëS> (\$\y±$X) (B) A_a ~ob (C) Oy± (D) \$sVmH¥${_ 11-31(B) 8 8. A colourless gas G is produced when egg-shells are treated with a solution S. The gas G turns lime water milky. S and G respectively are : (A) H2SO4 and SO2 (B) HCl and SO2 (C) NaCl and CO2 (D) HCl and CO2 9. The most reactive metal among the following towards cold water is : (A) Aluminium (B) Potassium (C) Sodium (D) Calcium 10. One mole of a hydrocarbon, on combustion in air, produces two moles of CO2, two moles of H2O and a large amount of heat. This hydrocarbon is : (A) ethyne (B) ethene (C) ethane (D) methane 11. An organism which breaks down the food material outside the body and then absorbs it is : (A) Bread mould (B) Cuscuta (C) Lice (D) Tapeworm 11-31(B) 9 P.T.O. 12. ídgZ H$s Ad{Y _| J¡gm| H$m {d{Z_` (AmXmZ-àXmZ) H$hm± hmoVm h¡ ? (A) Hy${nH$mE± (B) ídgZr (C) H§$R> (D) ídmgZbr 13. {H$gr V§{ÌH$m H$mo{eH$m (Ý`yam°Z) _| {dÚwV {g½Zb H$m amgm`{ZH$ {g½Zb _| ê$nmÝVaU hmoVm h¡ : (A) Ðþ{_H$m Ho$ {gao na (B) H$mo{eH$m H$m` _| (C) V§{ÌH$mj na (D) V§{ÌH$mj Ho$ {gao na 14. {H$gr ~rO H$m dh ^mJ Ohm± ImÚ g§J«{hV h¡, Omo ^ Am¡a Omo ^mdr àamoh h¡, H«$_e: h¢ : (A) àm§Hw$a, _ybm§Hw$a, ~rO nÌ (B) ~rO nÌ, àm§Hw$a, _ybm§Hw$a (C) ~rO nÌ, _ybm§Hw$a, àm§Hw$a (D) _ybm§Hw$a, àm§Hw$a, ~rO nÌ 15. _Q>a Ho$ Xmo nm¡Yo, {OZ_| EH$ Jmob hao (RRyy) ~rOm| H$m VWm Xÿgam PwauXma nrbo (rrYY) ~rOm| H$m h¡, F1 g§V{V Ho$ nm¡Yo Omo Jmob nrbo (RrYy) ~rOm| Ho$ h¢ CËnÞ H$aVo h¢ & `{X F1 g§V{V Ho$ nm¡Ym| H$m ñd-namJU H$am`m OmE, Vmo F2 g§V{V Ho$ nm¡Ym| _| {OZ nm¡Ym| H$s g§»`m g~go H$_ h¡ dh bjUm| _| {H$g àH$ma Ho$ {XImB© Xo§Jo ? (A) PwauXma hao (B) PwauXma nrbo (C) Jmob hao (D) Jmob nrbo 11-31(B) 10 12. During respiration, exchange of gases occurs in : (A) Alveoli (B) Bronchi (C) Larynx (D) Trachea 13. In a nerve cell (neuron), the conversion of electrical signal to chemical signal occurs in/at : (A) dendritic end (B) cell body (C) axon (D) axonal end 14. The part of a seed that stores food, the future root and the future shoot respectively are : (A) Plumule, radicle, cotyledon (B) Cotyledon, plumule, radicle (C) Cotyledon, radicle, plumule (D) Radicle, plumule, cotyledon 15. Two pea plants, one round green (RRyy) seeds and another with wrinkled yellow (rrYY) seeds produce F1 progeny that has round yellow (RrYy) seeds. If the F1 progeny plants are selfed, then the minimum number of plants of the F2 progeny will have the following observable characters : (A) Wrinkled green (B) Wrinkled yellow (C) Round green (D) Round yellow 11-31(B) 11 P.T.O. 16. ZrMo {XE JE g_yhm| na {dMma H$s{OE : i. H$nmg, aoe_, Zm`bm° ii. iii. iv. gm~wZ, An_mO©H$ ({S>Q>aO¡ÝQ>), aoe_, nm°{bEñQ>a BZ_| O¡d{ZåZrH$aUr` nXmWm] H$m g_yh h¡ : (A) i, ii Am¡a iii (B) ii, iii Am¡a iv (C) i Am¡a iv (D) ii Am¡a iii 17 20 (A) (R) (A), (B), (C) (D) (A) A{^H$WZ (A) Am¡a VH©$ (R) XmoZm| ghr h¢ Am¡a VH©$ (R), A{^H$WZ (A) H$s ghr ì¶m»¶m H$aVm h¡ & (B) A{^H$WZ (A) Am¡a VH©$ (R) XmoZm| ghr h¢, naÝVw VH©$ (R), A{^H$WZ (A) H$s ghr ì¶m»¶m H$aVm h¡ & (C) A{^H$WZ (A) ghr h¡ VWm VH©$ (R) µJbV h¡ & (D) A{^H$WZ (A) µJbV h¡ VWm VH©$ (R) ghr h¡ & 17. (A) : {H$gr Ymamdmhr d¥ÎmmH$ma Hw$ÊS>br Ûmam CgHo$ Ho$ÝÐ na CËnÞ Mwå~H$s` joÌ H$s Vrd«Vm Hw$ÊS>br _| \ A{YH$ hmo OmVr h¡ & (R) : Hw$ÊS>br Ho$ àË`oH$ \o$ao _| àdm{hV Ymam H$m n[a_mU g_mZ VWm {Xem ^r g_mZ hmoVr h¡, {OgHo$ H$maU ì`pîQ>JV \o$am| Ho$ Mwå~H$s` joÌ g§`mo{OV hmo OmVo h¢ & 11-31(B) 12 16. Consider the following groups : i. Cotton, silk, nylon, leather ii. Wool, wood, soap, wheat iii. Banana, cat, rat, tree iv. Soap, detergent, silk, polyester The groups of biodegradable material are : (A) i, ii and iii (B) ii, iii and iv (C) i and iv (D) ii and iii For Questions number 17 and 20, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true and Reason (R) is false. (D) Assertion (A) is false and Reason (R) is true. 17. Assertion (A) : The intensity of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns in the coil. Reason (R) : The current that flows in each turn of the coil has the same magnitude and same direction and the magnetic field, due to each turn, just adds up. 11-31(B) 13 P.T.O. 18. (A) : (R) : 19. (A) : OZH$m| go d§emZwJV JwUgyÌ & (R) : Y JwUgyÌ Cgo AnZo {nVm go d§emZwJV hmoVm h¡ & 20. (A) : àË`oH$ Amhma ûm¥§Ibm _| {ZMbo nmofr ñVam| na ì`pîQ>`m| H$s g§»`m A{YH$ hmoVr h¢ & (R) : My±{H$ àË`oH$ H«$_mJV nmofr ñVa na D$Om© H$s _mÌm KQ>Vr OmVr h¡, AJbo nmofr ñVam| Ho$ ^aU-nmofU Ho$ {bE {ZMbo nmofr ñVa na A{YH$ g§»`m _| ì`pîQ>`m|o H$s Amdí`H$Vm hmoVr h¡ & IÊS> I 21. (H$) g_Vb Xn©U Ûmam ~Zo à{V{~å~m| Ho$ Mma JwUm| H$s gyMr ~ZmBE & 2 AWdm (I) AdVb Xn©U Ho$ g§X^© _| ZrMo {XE JE nXm| H$s n[a^mfm {b{IE : 2 (i) Y«wd (ii) dH«$Vm Ho$ÝÐ (iii) dH«$Vm {ÌÁ`m (iv) _w»` Aj 22. {H$gr Ymamdmhr grYo MmbH$ Ûmam CËnÞ Mwå~H$s` joÌ H$s AmH¥${V H$m CëboI H$s{OE & Bg joÌ H$s {Xem H$mo kmV H$aZo H$m {Z`_ {b{IE & 2 11-31(B) 14 18. Assertion (A) : Silver oxide is an amphoteric oxide. Reason (R) : Metal oxides which react with both acids as well as bases are called amphoteric oxides. 19. Assertion (A) : Chromosomes inherited from the parents decide the sex of a child. Reason (R) : Y chromosome in a male child is inherited from the father. 20. Assertion (A) : Greater number of individuals are present in lower trophic levels of all food chains. Reason (R) : As the amount of energy decreases at each successive trophic level, larger number of individuals are required at the lower trophic levels to support higher/next trophic levels. SECTION B 21. (a) List four properties of the images formed by a plane mirror. 2 OR (b) Write the definitions of the following terms in the context of a concave mirror : 2 (i) Pole (ii) Centre of curvature (iii) Radius of curvature (iv) Principal axis 22. Write the shape of the magnetic field produced by a current carrying straight conductor. State the rule to find the direction of this field. 2 11-31(B) 15 P.T.O. 23. (H$) H$moB© `m¡{JH$ O~ 373 K na J_© {H$`m OmVm h¡ Vmo Ob Ho$ AUwAm| H$mo ImoH$a ~Z OmVm h¡ & nXmW© Q>a Qy>Q>r hþB© h{È>`m| H$mo ghr OJh na pñWa aIZo Ho$ {bE H$aVo h¢ & (i) Am¡a H$s nhMmZ H$s{OE & (ii) h_ go H$mo {\$a go {H$g àH$ma àmá H$a gH$Vo h¢ ? 2 AWdm (I) Xmo {db`Z X Am¡a Y gm{d©H$ gyMH$ Hoo$ gmW H«$_e: bmb Am¡a Zrbm a§J XoVo h¢ & (i) BZ XmoZm| {db`Zm| _| go {H$g_| AÝ` H$s Anojm hmBS´>moOZ Am`Zm| H$s g§»`m A{YH$ h¡ ? AnZo CÎma H$s nwpîQ> H$s{OE & (ii) `{X X Am¡a Y H$mo nañna C{MV _mÌm _| {_bmH$a n[aUm_r {_lU H$m narjU gm{d©H$ gyMH$ Ho$ gmW H$a| Vmo dh ham hmo OmVm h¡ & ? AnZo CÎma H$s nwpîQ> H$s{OE & 2 24. O~ Ebw{_{Z`_ YmVw H$s {H$gr nÌr H$mo \¡$ag gë\o$Q> Ho$ {db`Z _| Sw>~mo`m OmVm h¡ Vmo {db`Z H$m \ & Bg àojU Ho$ AmYma na AnZo {ZîH$f© H$m CëboI H$s{OE & Bg àH$aU _| hmoZo dmbr amgm`{ZH$ A{^{H«$`m H$m amgm`{ZH$ g_rH$aU {b{IE & 2 25. {ZåZ{b{IV Ho$ {bE H$maU Xr{OE : 2 (H$) Zmgm Ûma Ho$ dm`w_mJ© _| _hrZ ~mb Am¡a íboî_m CnpñWV ahVo h¢ & (I) H§$R> _| CnmpñW`m| Ho$ db` CnpñWV hmoVo h¢ & 11-31(B) 16 23. (a) doctors for supporting fractured bones in the right position. (i) Identify and. (ii) How can we obtain from ? 2 OR (b) Two solutions X and Y give red and blue colour respectively with universal indicator. (i) In which solution is the hydrogen ion concentration more than the other ? Justify your answer. (ii) If X and Y are mixed in proper amounts and the resultant mixture is tested with a universal indicator, it turns green. What is the nature of the salt formed ? Justify your answer. 2 24. When a strip of aluminium metal is dipped in a solution of ferrous sulphate, the pale green colour of the solution fades away. State the conclusion you can draw from this observation. Write chemical equation for the reaction that occurs in this case. 2 25. Give reason for the following : 2 (a) Fine hair and mucus are present in the nasal passage. (b) Rings of cartilage are present in the throat. 11-31(B) 17 P.T.O. 26. (H$) _mZd _pñVîH$ Ho$ Cg ^mJ H$m Zm_ {b{IE Omo ZrMo {XE JE H$m`m] Ho$ {bE CÎmaXm`r hmoVm h¡ : 2 (i) gmoMZm (ii) aº$Mmn (iii) eara H$s g§pñW{V Am¡a g§VwbZ ~ZmE aIZm (iv) bma AmZm AWdm (I) nmXn Ho$ Cg A§J/^mJ H$m Zm_ {b{IE Omo Xem©Vm h¡ : 2 (i) YZmË_H$ ObmZwdV©Z (ii) YZmË_H$ àH$memZwdV©Z (iii) G$UmË_H$ JwéËdmZwdV©Z (iv) YZmË_H$ agm`ZmZwdV©Z IÊS> J 27. (H$) (i) {dÚwV â`yµO {H$g àH$ma n[anW Am¡a gm{YÌ H$mo bKwnWZ AWdm A{V^maÊm go hmoZo dmbr g§^m{dV j{V go ~MmVm h¡ ? (ii) Kaoby Amny{V© _| Cn`moJ hmoZo dmbr {dÚwV Ymam Ho$ àH$ma go ewîH$ gobm| AWdm g§Mm`r ~¡Q>[a`m| go àmá {dÚwV Ymam {H$g àH$ma {^Þ hmoVr h¡ ? (iii) {dÚwV e{º$ Ho$ XÿañW àofU Ho$ {bE àË`mdVu Ymam (ac) H$mo {XîQ> Ymam (dc) OmVm h¡ ? 3 AWdm 11-31(B) 18 26. (a) Name the part of human brain which is responsible for the following actions : 2 (i) Thinking (ii) Blood pressure (iii) Maintaining posture and balance (iv) Salivation OR (b) Name the organ/part of a plant which shows : 2 (i) Positive hydrotropism (ii) Positive phototropism (iii) Negative geotropism (iv) Positive chemotropism SECTION C 27. (a) (i) How does an electric fuse prevent the circuit and the appliances from possible damage due to short circuiting or overloading ? (ii) How is the type of current used in household supply different from the one given by dry cells or storage batteries ? (iii) For distant transmission of electric power, an alternating current (ac) is considered to be advantageous over direct current (dc). Why ? 3 OR 11-31(B) 19 P.T.O.  (I) (i) H$moB© grYm MmbH$ {H$gr à~b Zmb Mwå~H$ Ho$ Mwå~H$s` joÌ Ho$ bå~dV AnZo Aj H$mo aIVo hþE j¡{VOV: {Zb§{~V h¢ & Bg MmbH$ go ñWm`r Ymam àdm{hV H$aZo na `h Xm`t Amoa {dñWm{nV hmo OmVm h¡ & Bg MmbH (1) Zmb Mwå~H$ H$s Y«wdVm CËH«${_V H$a Xr OmE ? (2) MmbH$ _| àdm{hV Ymam H$s {Xem CËH«${_V H$a Xr OmE ? (3) MmbH$ _| àdm{hV Ymam _| d¥{Õ H$a Xr OmE ? (ii) {H$gr Mwå~H$s` joÌ _| pñWV {H$gr Ymamdmhr MmbH$ na bJZo dmbo ~b H$s {Xem H$mo {ZYm©[aV H$aZo dmbo {Z`_ H$m Zm_ Am¡a {Z`_ {b{IE & 3 28. AmH$me _| H$~ Am¡a H$hm± BÝÐYZwf ÑpîQ>JmoMa hmoVm h¡ ? BÝÐYZwf ~ZVo g_` hmoZo dmbr àH$me H$s n[aKQ>ZmAm| H$mo CZHo$ C{MV H«$_ _| {b{IE & MÝÐ_m Ho$ n¥îR> go BÝÐYZw ? 3 29. (H$) AewÕ YmVwAm| Ho$ n[aîH$aU Ho$ {bE Cn`moJ hmoZo dmbr g~go àM{bV {d{Y H$m Zm_ {b{IE Am¡a CgH$s ì`m»`m H$s{OE & 3 AWdm (I) amgm`{ZH g_rH$aUm| H$s ghm`Vm go ^O©Z Am¡a {ZñVmnZ Ho$ ~rM {d^oXZ H$s{OE & A`ñH$ Ho$ ^O©Z/{ZñVmnZ go àmá CËnmXm| go YmVw H$m AnM`Z {H$g àH$ma {H$`m OmVm h¡ & hmoZo dmbr A{^{H«$`m H$m amgm`{ZH$ g_rH$aU {b{IE & 3 11-31(B) 20  (b) (i) A straight conductor is suspended horizontally with its axis perpendicular to the magnetic field of a strong horseshoe magnet. The conductor gets displaced towards the right when a steady current is passed through it. What will happen to the displacement of the conductor if the : (1) Polarity of the horseshoe magnet is reversed ? (2) Direction of current in the conductor is reversed ? (3) Current through the conductor is increased ? (ii) Name and state the rule for determining the direction of force on a current carrying conductor placed in a magnetic field. 3 28. When and where does a rainbow appear in the sky ? List the phenomena of light in proper sequence which occurs during the formation of a rainbow. Why can a rainbow not be seen from the surface of the moon ? 3 29. (a) Name and explain the most widely used method for refining impure metals. 3 OR (b) With the help of chemical equations differentiate between roasting and calcination. How is metal reduced from the product obtained after roasting/calcination of the ore ? Write the chemical equation for the reaction involved. 3 11-31(B) 21 P.T.O. 30. {ZåZ{b{IV H$m~©{ZH$ `m¡{JH$m| na {dMma H$s{OE : C2H5CHO, CH3COOH, C2H5OH, CH3COCH3 (H$) BZ_| go {H$g `m¡{JH$ H$mo O~ gm§Ð H2SO4 _| 443 K na Ja_ {H$`m OmVm h¡ Vmo _w»` CËnmX Ho$ ê$n _| EWrZ ~ZVr h¡ ? Bg A{^{H«$`m _| gm§Ð H2SO4 H$s ^y{_H$m H$m CëboI H$s{OE & Bg_| hmoZo dmbr amgm`{ZH$ A{^{H«$`m H$m amgm`{ZH$ g_rH$aU ^r {b{IE & (I) gm§Ð H2SO4 H$s CnpñW{V _| CH3COOH Am¡a C2H5OH Ho$ ~rM hmoZo dmbr amgm`{ZH$ A{^{H«$`m H$m amgm`{ZH$ g_rH$aU {b{IE & 3 31. (H$) S>amdZr n[apñW{V`m| _| _mZd eara _| _wº$ hmoZo dmbo (i) hm°_m}Z Am¡a Cgo (ii) òm{dV H$aZo dmbr J«§{W H$m Zm_ {b{IE & ì`m»`m H$s{OE {H$ h_mam eara BZ n[apñW{V`m| H$m gm_Zm H$aZo Ho$ {bE {H$g àH$ma AZw{H«$`m H$aVm h¡ ? 3 AWdm (I) àamoh Ho$ AJ«^mJ na g§íbo{fV hmoZo dmbo nmXn d¥{Õ hm°_m}Z H$m Zm_ go AmZo dmbo àH$me H$s A (PwH$) OmVm h¡ & 3 32. H$moB© bjU d§emZwJV Vmo hmo, naÝVw n[ab{jV Z hmo nmE ? AnZo CÎma H$s nwpîQ> Ho$ {bE H$moB© CXmhaÊm Xr{OE & 3 33. (H$) AnKQ>H$ ? ì`m»`m H$s{OE {H$ AnKQ>H$ {H$g àH$ma (i) n`m©daU H$mo ñdÀN> aIVo h¢ VWm (ii) _¥Xm-nmofH$m| H$s nwZ:ny{V© H$aVo h¢ & 3 AWdm (I) H$moB© Amhma ûm§¥Ibm {H$gH$m {Zê$nU H$aVr h¡ ? {H$gr Amhma ûm§¥Ibm _| nmofr ñVam| H$s g§»`m gr{_V hmoVr h¡ & Bg H$WZ H$s nwpîQ> H$maU g{hV H$moB© CXmhaU XoH$a H$s{OE & 3 11-31(B) 22 30. Consider the following organic compounds : C2H5CHO, CH3COOH, C2H5OH, CH3COCH3 (a) Which one of these compounds when heated at 443 K in excess conc. H2SO4 forms ethene as its major product ? State the role of conc. H2SO4 in the reaction. Also, write the chemical equation for the chemical reaction involved. (b) Give chemical equation for the chemical reaction when CH3COOH and C2H5OH react in the presence of conc. H2SO4. 3 31. (a) Name the (i) hormone released, and the (ii) gland which secretes it in human beings during scary situations. Explain how our body responds to enable it to deal with such situations. 3 OR (b) Name the plant growth hormone which is synthesized at the shoot tip. Explain why the shoot of a potted plant bends towards light coming from a window. 3 32. Is it possible that a trait gets inherited, but not expressed ? Give an example to justify your answer. 3 33. (a) What are decomposers ? Explain how the decomposers (i) keep the environment clean, and also (ii) replenish the soil nutrients. 3 OR (b) What stating reason to justify this statement. 3 11-31(B) 23 P.T.O.  IÊS> K 34. (H$) (i) bå~mB© (l) VWm AZwàñW-H$mQ> joÌ\$b (A) Ho$ {H$gr EH$g_mZ YmpËdH$ MmbH$ Ho$ {bE à{VamoYH$Vm ( ) Am¡a à{VamoY (R) Ho$ ~rM g§~§Y {b{IE & Bg g§~§Y H$m Cn`moJ H$aHo$ à{VamoYH$Vm H$m SI _mÌH$ àmá H$s{OE & (ii) 100 m bå~mB© Ho$ {H$gr YmVw Ho$ Vma H$m à{VamoY 20 h¡ & `{X Bg Vma H$s {ÌÁ`m 5 mm h¡, Vmo Vma Ho$ YmVw H$s à{VamoYH$Vm kmV H$s{OE & 5 AWdm (I) (i) à{VamoY R Ho$ {H$gr MmbH$ _| CËnÝZ D$î_m Ho$ {bE H$moB© ì`§OH$ àmá H$s{OE O~{H$ Bg MmbH$ go g_` t Ho$ {bE H$moB© ñWm`r Ymam I àdm{hV hmo ahr h¡ & (ii) H$moB© {dÚwV VmnH$ {OgH$m à{VamoY 10 h¡ {dÚwV _oÝg _| go 2 K§Q>o VH$ 5 A H$s ñWm`r Ymam bo ahm h¡ & Bg VmnH$ H$s e{º$ VWm BgHo$ Ûmam {H$bmodmQ> K§Q>m _| Cn^wº$ D$Om© kmV H$s{OE & 5 35. H$s à{H«$`m H$m Zm_ {b{IE Am¡a CgH$s ì`m»`m H$s{OE & EZmoS> Am¡a H¡$WmoS> na H«$_e: _wº$ hmoZo dmbr Xmo J¡gm| H$m Zm_ {b{IE & BZ_| àË`oH$ J¡g Ho$ Xmo-Xmo Cn`moJm| H$s gyMr ~ZmBE & 5 36. (H$) (i) H$m{`H$ àdY©Z {H$go H$hVo h¢ ? `h à{H«$`m b¢{JH$ h¡ AWdm Ab¢{JH$ ? AnZo CÎma H$s nwpîQ> H${OE & (ii) {H$gmZmo§ Ûmam Bg à{H«$`m/VH$ZrH$ H$m Cn`moJ H$aZo Ho$ VrZ bm^m| H$s gyMr ~ZmBE & (iii) Bg VH$ZrH$ Ûmam {ZåZ{b{IV _| go àmá {H$E Om gH$Zo dmbo Xmo nm¡Yo Mw{ZE : 5 Ho$bm, nnrVm, M_obr, gagm| AWdm 11-31(B) 24  SECTION D 34. (a) (i) Write the relation between resistivity ( ) and resistance (R) for a uniform metallic conductor of length (l) and area of cross-section (A). Use this relation to obtain the SI unit of resistivity. (ii) The resistance of a metallic wire of 100 m is 20. If the radius of the wire is 5 mm, find the resistivity of the metal of the wire. 5 OR (b) (i) Obtain an expression for the amount of heat produced in a conductor of resistance R when a steady current I flows through it for a time t. (ii) An electrical heater of resistance 10 draws a steady current of 5 A from the service mains for 2 hours. Find the power of this heater and the amount of energy consumed by the heater in kilowatt hour. 5 35. Name and explain the process used to obtain sodium hydroxide from the aqueous solution of sodium chloride (Brine). Name the two gases which are given at the anode and the cathode respectively. List two uses of each of these gases. 5 36. (a) (i) What is vegetative propagation ? Is this process sexual or asexual ? Justify your answer. (ii) List three advantages of practising the process/technique by the farmers. (iii) Select two plants from the following which are obtained by this technique : Banana, Papaya, Jasmine, Mustard 5 OR 11-31(B) 25 P.T.O.  (I) (i) _mZd _mXm OZZ V§Ì Ho$ ZrMo {XE JE ^mJm| _| àË`oH$ Ho$ Xmo-Xmo H$m`m] H$s gyMr ~ZmBE : (1) AÊS>dm{hH$m (\o$bmo{n`Z Q>çy~) (2) J^m©e` (3) AÊS>me` (ii) ^«yU _mVm Ho$ eara Ho$ ^rVa nmofU {H$g àH$ma àmá H$aVm h¡ ? g§jon _| ì`m»`m H$s{OE & 5 IÊS> L> 37 39 3 37. {H$gr N>mÌ Ho$ nmg {d{^Þ \$moH$g Xÿ[a`m| Ho$ VrZ CÎmb b|g A, B Am¡a C h¢ & dh ZrMo Xr J`r Vm{bH$m Ho$ AZwgma _mo_~Îmr H$s Ádmbm H$mo b|g go {d{^Þ Xÿ[a`m| na aIH$a nX} na ~ZZo dmbo Ádmbm Ho$ à{V{~å~m| H$m AÜ``Z H$aZm MmhVm h¡ : àH$aU g§»`m b|g \$moH$g Xÿar {~å~ Xÿar 1 A 50 cm 25 cm 2 B 20 cm 60 cm 3 C 15 cm 30 cm (i) àH$aU 2 _| b|g B Ûmam ~Zo à{V{~å~ Ho$ Xmo JwUm| H$s gyMr ~ZmBE & 1 (ii) BZ VrZm| àH$aUm| _| go {H$g EH$ àH$aU _| b|g Ûmam {~å~ Ho$ g_mZ gmBµO H$m dmñV{dH$ à{V{~å~ ~ZoJm Am¡ ? 1 11-31(B) 26  (b) (i) List two functions each of the following parts of the human female reproductive system : (1) oviduct (2) uterus (3) ovary (ii) How does the embryo get nourishment inside the 5 SECTION E Q. No. 37 to 39 are source-based/case-based questions with 3 sub-parts. Internal choice is provided in one of these sub-parts. 37. A student has three convex lenses A, B and C of different focal lengths. He wants to observe the images formed by these lenses on a screen by placing a candle flame at different distances as given in following table : Focal Case No. Lens Object Distance Length 1 A 50 cm 25 cm 2 B 20 cm 60 cm 3 C 15 cm 30 cm (i) List two properties of the image formed by the lens B in case no. 2. 1 (ii) In which one of the three cases given above will the lens form a real image of the same size as the object and why ? 1 11-31(B) 27 P.T.O.  (iii) (H$) XrK©ÑpîQ>Xmof Ho$ g§emoYZ Ho$ {bE ZoÌ {M{H$ËgH$ {H$g àH$ma Ho$ b|g H$mo {ZYm©[aV H$aVo h¢ ? CëboI H$s{OE {H$ Bg àH$ma Ho$ amoJ go ^y{_H$m hmoVr h¡ ? 2 AWdm (iii) (I) b|g gyÌ H$m Cn`moJ H$aHo$ àH$aU 1 _| b|g A Ûmam ~Zo à{V{~å~ H$s b|g Ho$ àH$m{eH$ Ho$ÝÐ go Xÿar kmV H$s{OE & 2 38. ZrMo {XE JE Hw$N> amgm`{ZH$ A{^{H«$`mAm| Ho$ Ag§Vw{bV amgm`{ZH$ g_rH$aUm| na {dMma H$s{OE : (1) CaO + H2O Ca(OH)2 (2) Pb(NO3)2 PbO + NO2 + O2 (3) CuSO4 + Fe FeSO4 + Cu (4) Na2SO4 + BaCl2 BaSO4 + NaCl (i) Cn`w©º$ A{^{H«$`mAm| _| go g§`moOZ A{^{H«$`m Mw{ZE & `h A{^{H«$`m D$î_mjonr h¡ AWdm D$î_memofr ? 1 (ii) BZ_| go H$m¡Z-gr A{^[H«$`m {dñWmnZ A{^{H«$`m H$m {Zê$nU H$aVr h¡ ? Bg_| hmoZo dmbo a§J n[adV©Z H$m CëboI H$s{OE & 1 (iii) (H$) Cn`w©º$ A{^{H«$`mAm| _| Cgo Mw{ZE {Og_| D$î_r` {d`moOZ hmoVm h¡ & \¡$ag gë\o$Q> Ho$ D$î_r` {d`moOZ H$mo Xem©Zo Ho$ {bE g§Vw{bV amgm`{ZH$ g_rH$aU {b{IE & 2 AWdm (iii) (I) A{^{H«$`mAm| H$s Cn`w©º$ gyMr _| Xr JB© {Û{dñWmnZ A{^{H«$`m Ho$ amgm`{ZH$ g_rH$aU H$mo eãX g_rH$aU Ho$$ ê$n _| {b{IE & H$maU AWdm Zht & 2 11-31(B) 28  (iii) (a) Name the type of lens presented by opticians for the correction of hypermetropia. State the role of such lenses in correcting the vision of the person suffering from this defect. 2 OR (iii) (b) Use Lens formula to find the distance of the image formed from the optical centre of the lens A in case no. 1. 2 38. Consider the unbalanced chemical equations of a the chemical reactions listed below : (1) CaO + H2O Ca(OH)2 (2) Pb(NO3)2 PbO + NO2 + O2 (3) CuSO4 + Fe FeSO4 + Cu (4) Na2SO4 + BaCl2 BaSO4 + NaCl (i) Select combination reaction from the reactions listed above. Is this reaction endothermic or exothermic ? 1 (ii) Which one of the these reactions represents a displacement reaction ? State the colour change observed in this reaction. 1 (iii) (a) Identify from the above list a reaction in which thermal decomposition occurs. Write the balanced chemical equation to represent thermal decomposition of ferrous sulphate. 2 OR (iii) (b) Write the word equation for the double displacement reaction given in the above list. Giving reason, state whether this reaction is a redox reaction or not. 2 11-31(B) 29 P.T.O. 39. n¥Ïdr Ho$ g^r Ordm| H$m AZwajU H$m`© {ZaÝVa hmoZm Mm{hE & `h Cg g_` ^r MbVm ahVm h¡ O~ do H$moB© {deof H$m`© Zht H$aVo & do g^r àH«$_ Omo gpå_{bV ê$n go AZwajU H$m H$m`© H$aVo h¢ O¡d àH«$_ H$hbmVo h¢ & `o àH«$_ h¢ nmofU, ídgZ, dhZ (n[adhZ) VWm CËgO©Z & (i) nmofU Ho$ Xmo àH$mam| H$s gyMr ~ZmBE & 1 (ii) h_ ^moOZ ImVo h¢ & dm`dr` ídgZ Ho$ g_` h_mao eara _| Bg ^moOZ H$m ? 1 (iii) (H$) dmînmoËgO©Z {H$go H$hVo h¢ ? nmXnm| Ho$ {bE `h {H$g àH$ma bm^H$mar h¡ ? 2 AWdm (iii) (I) _yÌ ~ZZo Ho$ A§J go àmaå^ H$aHo$ _yÌ Ho$ nW H$m CëboI H$s{OE & CZ {H$Ýht Xmo nXmWm] H$m Zm_ {b{IE {OZH$m nwZamdemofU w Ho$ Z{bH$mH$ma ^mJ _| hmoVm h¡ & 2 11-31(B) 30 39. The maintenance functions of every living organism on the earth keeps going on even when they are not doing anything particular. The processes which together perform the job of maintenance of life are known as life processes. These processes are nutrition, respiration, transportation and excretion. (i) List two types of nutrition. 1 (ii) We eat food. What happens to this food during aerobic respiration in our body ? 1 (iii) (a) What is transpiration ? How is it useful to plants ? 2 OR (iii) (b) Mention the pathway of urine starting from the organ of its formation. Name any two substances which are reabsorbed from the initial filtrate in the tubular part of the nephron. 2 11-31(B) 31 P.T.O.