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CBSE 10th Board Class 10 2019 : Science

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SET-1 H$moS> Z . Series JMS/C Code No. amob Z . 31/1/1 narjmWu H$moS >H$mo C ma-nwp VH$m Ho$ _wI-n >na Ad ` {bIo & Roll No. Candidates must write the Code on the title page of the answer-book. H $n`m Om M H$a b| {H$ Bg Z-n _o _w{ V n > 16 h & Z-n _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Z ~a H$mo N>m C ma-nwp VH$m Ho$ _wI-n > na {bI| & H $n`m Om M H$a b| {H$ Bg Z-n _| >27 Z h & H $n`m Z H$m C ma {bIZm ew $ H$aZo go nhbo, Z H$m H $_m H$ Ad ` {bI| & Bg Z-n H$mo n T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h & Z-n H$m {dVaU nydm _| 10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>m Ho$db Z-n H$mo n T>|Jo Am a Bg Ad{Y Ho$ Xm amZ do C ma-nwp VH$m na H$moB C ma Zht {bI|Jo & Please check that this question paper contains 16 printed pages. 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. Please check that this question paper contains 27 questions. Please write down the Serial Number of the question before attempting it. 15 minute 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. {dkmZ SCIENCE {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 80 Time allowed : 3 hours 31/1/1 Maximum Marks : 80 1 P.T.O. gm_m ` {ZX}e : (i) Bg Z-n H$mo nm M ^mJm|, A, ~, g, X Am a | ~m Q>m J m h & AmnH$mo g^r ^mJm| Ho$ Zm| Ho$ C ma {bIZo h & (ii) g^r Z A{Zdm` h & (iii) ^mJ ~, g, X Am a Ho$ Zm| | Am V[aH$ M Z {X m J m h & (iv) ^mJ A Ho$ Z g `m 1 Am a 2 EH$-EH$ A H$ Ho$ Z h & BZHo$ C ma EH$ e X AWdm EH$ dm ` _| XoZo h & (v) ^mJ ~ Ho$ Z g m 3 go 5 Xmo-Xmo A H$m| Ho$ Z h & BZHo$ C ma bJ^J 30 e Xm| `oH$ | XoZo h & (vi) ^mJ g Ho$ Z g m 6 go 15 VrZ-VrZ A H$m| Ho$ Z h & BZHo$ C ma bJ^J 50 e Xm| `oH$ | XoZo h & (vii) ^mJ X Ho$ Z g m 16 go 21 nm M-nm M A H$m| Ho$ Z h & BZHo$ C ma bJ^J 70 e Xm| `oH$ | XoZo h & (viii) ^mJ Ho$ Z g m 22 go 27 moJm H$ H$m eb na AmYm[aV Xmo-Xmo A H$m| Ho$ Z h & BZHo$ g {j V C ma XoZo h & General Instructions : (i) The question paper comprises five Sections, A, B, C, D and E. You are to attempt All the sections. (ii) All questions are compulsory. (iii) Internal choice is given in Sections B, C, D and E. (iv) Questions number 1 and 2 in Section A are one-mark questions. They are to be answered in one word or in one sentence. (v) Questions number 3 to 5 in Section B are two-marks questions. These are to be answered in about 30 words each. (vi) Questions number 6 to 15 in Section C are three-marks questions. These are to be answered in about 50 words each. (vii) Questions number 16 to 21 in Section D are five-marks questions. These are to be answered in about 70 words each. (viii) Questions number 22 to 27 in Section E are based on practical skills. Each question is a two-marks question. These are to be answered in brief. ^mJ A SECTION A 1. A `me`r ag _| Cnp WV {H$gr E OmB_ H$m Zm_ {b{IE & 1 Name an enzyme present in pancreatic juice. 2. ~ S>o ~m Ym| H$mo ~ZmZo Ho$ H$maU C n hmoZo dmbr _wI gm_m{OH$ g_ `m H$m C oI H$s{OE & Mention the main social problem caused by building large dams. 31/1/1 2 1 ^mJ ~ SECTION B 3. H$moB Ymp dH$ `m {JH$ X VZw hmBS >mo bmo[aH$ A b go A{^{H $`m H$aZo na Vrd ~wX~wXmhQ> C n H$aVm h & C g{O V J g MyZo Ho$ nmZr go dm{hV H$aZo na doV Adjon ~ZmVr h & Cn`w $ d{U V amgm`{ZH$ A{^{H $`mAm| Ho$ g Vw{bV amgm`{ZH$ g_rH$aU {b{IE & 2 A metal compound X reacts with dilute hydrochloric acid to produce brisk effervescence. The gas evolved forms a white precipitate when passed through lime water. Write balanced chemical equations involved in the above mentioned chemical reactions. 4. ZrMo Xem E JE AmaoI Ho$ ^mJ A Am a ^mJ B H$m 2 Zm_ Am a `oH$ H$m EH$ H$m` {b{IE & B A Write the name and one function each of the parts A and B shown in the following diagram. B A 31/1/1 3 P.T.O. 5. H$me Ho$ AndV Z H$m Zob H$m {Z`_ {b{IE & H$me H$s Mmb Ho$ nXm| _| {H$gr _m `_ Ho$ {Zanoj AndV Zm H$ Ho$ {bE ` OH$ {b{IE & AWdm 2 n H$me dm`w go 1 50 AndV Zm H$ Ho$ H$m M _| doe H$aVm h & H$m M _| H$me H$s Mmb n[aH${bV H$s{OE & {X`m J`m h : {Zdm V _| H$me H$s Mmb = 3 108 m/s. 2 State Snell s law of refraction of light. Write an expression for the absolute refractive index of a medium in terms of speed of light. OR Light enters from air to glass having refractive index 1 50. Calculate the speed of light in the glass. Given : The speed of light in vacuum is = 3 108 m/s. ^mJ g SECTION C 6. (a) ZrMo Xr JB A{^{H $`m MnO2 + 4HCl MnCl2 + 2H2O + Cl2 (b) _| CnMm`H$ Am a AnMm`H$ H$s nhMmZ H$s{OE & H$maU Xr{OE : (i) (ii) (a) dgm`w $ Am a V br` Im -gm_J r _| {V-Am grH$maH$ {_bmE OmVo h & gy` Ho$ H$me _| doV {g da bmoamBS> H$m a J Yyga hmo OmVm h & In the following reaction : MnO2 + 4HCl MnCl2 + 2H2O + Cl2 Identify the oxidant and reductant. (b) 31/1/1 Give reasons : (i) Antioxidants are added to foods containing fats and oils. (ii) White silver chloride turns grey in sunlight. 4 3 7. (a) (b) (c) (a) (b) 8. pH Ho$b `m _mnVm h ? BgH$m n[aga {b{IE & pH Ho$b Ho$ C V_ Am a {Z ZV_ _mZm| H$s gmW H$Vm H$m C oI H$s{OE & AWdm 3 bdUOb (~ mBZ) Ho$ {d wV -AnKQ>Z H$mo bmoa-jma {H $`m `m| H$hVo h ? Bg {H $`m _| gp _{bV amgm`{ZH$ g_rH$aU {b{IE & {H$gr ew H$ naIZbr _| H$m na g \o$Q> Ho$ Hw$N> Ob`mo{OV {H $ Q>bm| H$mo J_ {H$`m J`m h & {H$ ht Xmo ojUm| H$s gyMr ~ZmBE & (a) What does pH scale measure ? (b) Write its range. (c) State the significance of highest and lowest values of pH scale. OR (a) Why is electrolysis of brine called Chlor-alkali process ? Write the chemical equation involved in this process. (b) A few crystals of hydrated copper sulphate are heated in a dry test-tube. Enlist any two observations. {Z Z{b{IV V dm| H$s VwbZm H$mo R>H$ _| {XE JE A{^bjUm| Ho$ AZwgma H$s{OE : (a) br{W`_ Am a ZmBQ >moOZ (na_mUw { `m) (b) nmoQ> {e`_ Am a bmoarZ ({d wV G$UVm) (c) _ Zr{e`_ Amoa H $p e`_ (g `moOH$Vm) `oH$ H$aU _| AnZo C ma H$m H$maU Xr{OE & 3 3 Compare the following elements as per the characteristics given in the brackets : (a) Lithium and Nitrogen (Atomic radii) (b) Potassium and Chlorine (Electronegativity) (c) Magnesium and Calcium (Valency) Give reason for your answer in each case. 9. `yam Z H$m AmaoI It{ME VWm AmaoI _| CZ ^mJm| Ho$ Zm_ A {H$V H$s{OE Ohm (a) gyMZm Cnm{O V H$s OmVr h , (b) go hmoH$a gyMZm {d wV AmdoJ Ho$ $n _| J_Z H$aVr h , VWm (c) {d wV AmdoJ AmJo ofU Ho$ {bE amgm`{ZH$ {g Zb _| n[ad{V V hmoZo Mm{hE & AWdm 31/1/1 5 3 P.T.O. ZrMo {XE JE `oH$ nmXn hm _m oZ H$m H$m` {b{IE : (a) {O~ao{bZ (b) Am p gZ (c) Ep g{gH$ A b 3 Draw a diagram of neuron and name and label the part (a) where information is acquired, (b) through which information travels as an electric impulse, and (c) where the electric impulse must be converted into a chemical signal for onward transmission. OR State the function of each of the following plant hormones : 10. (a) Gibberellins (b) Auxins (c) Abscisic acid (a) OmBb_ Am a bmoE_ Ho$ ~rM Xmo {d^oXZH$mar bjUm| H$s gyMr Vm{bH$m Ho$ $n _| ~ZmBE & nmXnm| _| WmZm VaU Ho$ Xmo bm^ {b{IE & (b) 11. (a) List in tabular form two differentiating features between xylem and phloem. (b) Write two advantages of transpiration in plants. 3 20 cm \$moH$g X ar Ho$ {H$gr C mb b|g go {H$gr {~ ~ H$mo {H$VZr X ar na aIm OmZm Mm{hE Vm{H$ BgH$m dm V{dH$ {V{~ ~ b|g go 30 cm X ar na m V hmo ? `{X {~ ~ 4 cm b ~m h , Vmo {V{~ ~ H$s b ~mB kmV H$s{OE & AWdm 20 cm \$moH$g X ar Ho$ {H$gr AdVb Xn U Ho$ gm_Zo {H$gr {~ ~ H$mo H$hm aIm OmE Vm{H$ CgH$m Xmo JwZm Amd{Y V Am^mgr {V{~ ~ m V hmo ? How far should an object be placed from a convex lens of focal length 20 cm to obtain its real image at a distance of 30 cm from the lens ? Determine the height of the image if the object is 4 cm tall. OR Where should an object be placed in front of a concave mirror of focal length 20 cm so as to obtain a two times magnified virtual image of the object ? 31/1/1 6 3 3 12. ZrMo {XE JE H$WZm| H$s nwp Q> H$s{OE : (a) {d wV ~ ~m| Ho$ V VwAm o Ho$ {Z_m U _| EH$_m Q> Qo>Z H$m hr Cn`moJ {H$`m OmVm h & (b) Kaoby n[anWm| _| loUr `d Wm H$m Cn`moJ Zht {H$`m OmVm h & (c) {d wV g MaU _| m`: H$m na Am a Eobw{_{Z`_ Ho$ Vmam| H$m Cn`moJ {H$`m OmVm h & 3 Justify the following statements : (a) Tungsten is used exclusively for filaments of electric lamps. (b) Series arrangement is not used for domestic circuits. (c) Copper and aluminium wires are usually employed for electricity transmission. 13. ZrMo {XE JE n[anW _| {XE JE {VamoYH$m| R1, R2 Am a R3 Ho$ _mZ H $_e: 10 , 20 Am a 30 h , {O h| 12 V H$s ~ Q>ar go g `mo{OV {H$`m J`m h & {Z Z{b{IV H$m n[aH$bZ H$s{OE : (a) `oH$ {VamoYH$ go dm{hV Ymam, (b) n[anW H$m Hw$b {VamoY, VWm (c) n[anW _| dm{hV Hw$b Ymam & 3 In the circuit given below, the resistors R1, R2 and R3 have the values 10 , 20 and 30 respectively, which have been connected to a battery of 12 V. Calculate (a) the current through each resistor, (b) the total circuit resistance, and (c) the total current in the circuit. 31/1/1 7 P.T.O. 14. Zm{^H$s` D$Om C n H$aZo _| Cn`moJ hmoZo dmbr {H $`m H$m Zm_ {b{IE & Zm{^H$s` D$Om Ho$ OZZ _| gm_m `V: Cn`moJ hmoZo dmbo Xmo V dm| H$s gyMr ~ZmBE & dh Xmo H$maU {b{IE Omo ~ hV Va na Zm{^H$s` D$Om Ho$ Cn`moJ H$mo {ZfoYH$ ~ZmVo h & 3 Name the process used to generate nuclear energy. List two elements commonly used for the generation of nuclear energy. Give two reasons which make the large scale use of nuclear energy prohibitive. 15. (a) (b) {H$gr Amhma m Ibm _| gm_m `V: VrZ `m Mma nmofr Va hr hmoVo h & `m `m H$s{OE & O d AmdY Z {H$go H$hVo h ? `m `m H$s{OE & (a) (b) A food chain generally has three or four trophic levels. Explain. What is biological magnification ? Explain. 3 ^mJ X SECTION D 16. (a) (b) (c) (a) (b) (c) 31/1/1 CZ Xmo YmVwAm| Ho$ Zm_ {b{IE Omo AnZo A` H$m| go Ho$db J_ H$aZo na hr m V hmo OmVr h & qOH$ Ho$ A` H$m| H$m CXmhaU boH$a {Z VmnZ Am a ^O Z Ho$ ~rM {d^oXZ H$s{OE & W{_ Q> A{^{H $`m `m hmoVr h ? BgH$m _h d {b{IE & Name two metals which are obtained from their ores by simple heating. Differentiate between calcination and roasting, taking examples of zinc ores. What is thermit reaction ? State its significance. 8 5 17. (a) (b) (c) (a) _oW Z AUw H$s Bbo Q >m Z-{~ X g aMZm It{ME & ZrMo {XE JE `m {JH$m| _| Cnp WV H$m`m _H$ g_yhm| H$s nhMmZ H$s{OE : (i) C2H6O (ii) C2H4O Am grOZ Am a EWmBZ Ho$ {_lU H$mo dop S> J _| Obm`m OmVm h & AmnHo$ {dMma go dop S> J _| EWmBZ Am a dm`w Ho$ {_lU H$m Cn`moJ `m| Zht {H$`m OmVm ? AWdm `oH$ H$aU _| A{^{H $`m hmoZo Ho$ {bE Amd `H$ nyar eVm o H$m C oI H$aVo h E ZrMo {XE JE $nm VaU H$s{OE : 5 (i) (b) EWoZm b H$mo EWoZm BH$ A b _| (ii) EWrZ H$mo EWoZ _| (iii) EWoZm b Am a EWoZm BH$ A b H$mo E Q>a _| Cn`w $ g^r $nm VaUm| H$mo {XE JE Zm_m| H$m C oI ^r H$s{OE & gm~wZm| H$s VwbZm _| {S>Q>aOo Q>m| (An_mO H$m|) H$mo mW{_H$Vm Xr OmVr h & `m| (H$moB EH$ H$maU Xr{OE) ? 5 (a) Draw electron dot structure of methane molecule. (b) Identify the functional groups present in the following compounds : (i) C2H6O (ii) C2H4O (c) A mixture of oxygen and ethyne is burnt for welding. Why do you think a mixture of ethyne and air is not used for welding ? OR (a) Carry out the following conversions giving complete conditions for the reaction to take place in each case : (i) Ethanoic acid from Ethanol (ii) Ethane from Ethene (iii) Ester from Ethanoic acid and ethanol Also state the names given to all the above conversions. (b) 31/1/1 Detergents are preferred over soaps. Why ? (Give one reason) 9 P.T.O. 18. (a) (b) (c) (a) (b) (c) (a) ` {n A_r~m Am a bo _m{Z`m OZZ H$s g_mZ {dYm Xem Vo h , na Vw OZZ H$s {H $`m Ho$ T> J BZ XmoZm| _| {^ -{^ h & BZ XmoZm| nrer O _| OZZ H$s {dYm nhMm{ZE Am a BZ_| hmoZo dmbr {H $`mAm| H$m C boI H$s{OE & nwZ X ^dZ (nwZO ZZ) {H$go H$hVo h ? boZo[a`m _| `h {H $`m {H$g H$ma hmoVr h AmaoI H$s ghm`Vm go n Q> H$s{OE & amB Omong Ho$ Cg ^mJ H$m Zm_ {b{IE {Og_| ~rOmUw ~ZVo h & Cg n[ap W{V H$m C oI H$s{OE {Og_| ~rOmUw d { H$aHo$ ZE Ord C n H$aVo h & AWdm b {JH$ g MaU mam OrdmUw O{ZV {H$ ht Xmo g H $_Um| Ho$ Zm_ {b{IE & BZgo ~Mmd {H$g H$ma {H$`m Om gH$Vm h ? Cn`w $ (a) _| ~VmE JE Cnm` Ho$ A{V[a $ AZMmho J^ H$mo amoH$Zo _| ghm`H$ VrZ A ` Cnm`m| H$s gyMr ~ZmBE & J^ {ZamoYr Cnm`m| H$mo AnZmZo Ho$ VrZ bm^m| H$s gyMr ~ZmBE & Although Amoeba and Leishmania, both show same mode of reproduction, but the process of reproduction is carried out in different ways. Identify their mode of reproduction and mention the way it is carried out in the two species. (b) What is regeneration ? Explain with the help of a diagram how this process is carried out in Planaria. (c) Name the part of Rhizopus in which spores are formed. State the condition under which spores grow into a new individual. OR (a) Name any two bacterial infections that are sexually transmitted. How can they be prevented ? (b) List three different ways, other than the one stated in (a) above, that help an individual to avoid unwanted pregnancies. (c) List three advantages for adopting contraceptive measures. 31/1/1 10 5 5 19. (a) (b) (a) 20. _|S>b Ho$ `moJm| H$s ghm`Vm go Xem BE {H$ (i) bjU ^mdr Am a A ^mdr hmo gH$Vo h , VWm (ii) bjU dV $n go d emZwJV hmoVo h & {Jbhar AWdm {N>nH$br H$s Anojm njr Ed M_JmX S> Ho$ ~rM g ~ Y A{YH$ K{Z R> h & {Q> nUr H$s{OE & With the help of Mendel s experiments show that (i) traits may be dominant or recessive, and (ii) traits are inherited independently. (b) Birds and bats are more closely related to each other than to squirrels or lizards. Comment. (a) (b) h_mao Zo _| Cnp WV n _m^r no{e`m| H$s ^y{_H$m H$m C oI H$s{OE & ZrMo {XE JE `oH$ H$aU _| p Q> Xmof H$s nhMmZ H$s{OE Am a CgHo$ g emoYZ H$m Cnm` gwPmBE : (i) A{^Zo b|g H$m X {Y`m `m Y wYbm hmo OmZm & (ii) A{^Zo b og H$s dH $Vm H$m A `{YH$ hmo OmZm & (iii) A{^Zo b|g H$s \$moH$g Xyar H$m A `{YH$ hmo OmZm (gm_m ` go A{YH$ hmo OmZm) & (iv) n _m^r no{e`m| H$m X ~ b hmo OmZm & AWdm AmaoI H$s ghm`Vm go AmB OH$ `yQ>Z Ho$ Cg `moJ H$s `m `m H$s{OE {Oggo `h YmaUm AmJo ~ T>r {H$ gy` H$m H$me gmV dUm o go {_bH$a ~Zm h & dm`w_ S>br` AndV Z {H$go H$hVo h ? dm`w_ S>br` AndV Z na AmYm[aV Xmo mH ${VH$ n[aKQ>ZmAm| H$s gyMr ~ZmBE & (a) (b) (a) (b) (a) (b) 31/1/1 5 5 5 State the role of ciliary muscles present in our eye. Identify the defect of vision in each of the following cases and suggest its corrective measure : (i) The eye lens has become milky and cloudy. (ii) The eye lens has excessive curvature. (iii) The eye lens has large focal length (longer than normal). (iv) Ciliary muscles have weakened. OR With the help of diagram explain Isaac Newton s experiment that led to the idea that the sunlight is made up of seven colours. What is atmospheric refraction ? List two natural phenomena based on atmospheric refraction. 11 P.T.O. 21. (a) (b) (c) (d) (a) (b) (c) (d) Xmo Mw ~H$s` jo aoImE EH$-X gao H$mo H$^r ^r {V N>o{XV `m| Zht H$aVt ? `m `m H$s{OE & {H$gr Ymamdmhr n[aZm{bH$m Ho$ ^rVa Ho$ Mw ~H$s` jo H$mo EH$g_mZ H$hm OmVm h & `m| ? boq_J H$m dm_h V {Z`_ {b{IE & `mdgm{`H$ _moQ>am| H$s e{ $ _| d { H$aZo dmbo Xmo H$maH$m| H$s gyMr ~ZmBE & 5 Why don t two magnetic field lines ever intersect each other ? Explain. The magnetic field is said to be uniform inside a current carrying solenoid. Why ? State Fleming s left hand rule. Enlist two factors that enhance the power of commercial motors. ^mJ SECTION E 22. VrZ n WH $ naIZ{b`m| _| {bE JE VrZ {^ a JhrZ {db`Zm| X, Y Am a Z _| H$moB N>m gmd { H$ gyMH$ H$s Hw$N> ~y X| {_bmVm h , Am a `h n ojU H$aVm h {H$ {db`Z H$m a J n[ad{V V hmoH$a X _| ham, Y _| bmb Am a Z _| Zrbm hmo J`m h & (a) {db`Zm| X, Y Am a Z H$mo CZHo$ pH Ho$ ~ T>Vo (Amamohr) H $_ _| `dp WV H$s{OE & (b) BZ VrZm| {db`Zm| X, Y Am a Z _| go H$m Z-gm {db`Z \$sZm \$Wo{bZ Ho$ a J H$mo n[ad{V V H$aoJm Am a `m| ? AWdm \o$ag g \o$Q> Ho$ D$ _r` {d`moOZ Ho$ g_` C n hmoZo dmbr J g Ho$ g nH $ _| (a) Jrbm Zrbm {bQ>_g n Am a (b) Jrbm bmb {bQ>_g n bmZo na H$moB N>m `m ojU H$aVm h Am a `m {Z H$f {ZH$mbVm h , BgH$m C oI H$s{OE & On adding a few drops of universal indicator in three colourless solutions X, Y and Z taken separately in three test tubes, a student observed the changes in colour as green in X, red in Y and blue in Z. (a) Arrange X, Y and Z in increasing order of their pH values. (b) Which one of the three, X, Y and Z, will change the colour of phenolphthalein ? Why ? OR State the observation and inference made by a student when he brings (i) a wet blue litmus paper and (ii) a wet red litmus paper in contact with the gas liberated during thermal decomposition of ferrous sulphate. 31/1/1 12 2 2 23. Mma n WH $ naIZ{b`m o I, II, III Am a IV _o| \o$ag g \o$Q> H$m \$sH$m ham {db`Z boH$a naIZ{b`m|, II, III Am a IV _| H $_e: Cu, Zn Am a Al Ho$ Qw>H$ S>o S>mbo JE & {H$g/{H$Z H$aU/ H$aUm| _| (a) \o$ag g \o$Q> {db`Z H$m a J naIZbr (I) Ho$ {db`Z Ho$ a J go gw_ob H$aoJm ? H$maU Xr{OE & (b) \o$ag g \o$Q> {db`Z H$m a J \$sH$m (bw V) hmo OmEJm VWm YmVwAm| Ho$ n R> na H$mbm nXmW {Zjo{nV hmo OmEJm ? 2 A pale green solution of ferrous sulphate was taken in four separate test tubes marked I, II, III and IV. Pieces of Cu, Zn and Al were dropped in test tubes II, III and IV respectively. In which case(s) 24. (a) the colour of ferrous sulphate solution will match with the colour in test tube (I) ? Give reason. (b) the colour of ferrous sulphate solution will fade and black mass will be deposited on the surface of the metal ? H$moB N>m { ~rOn r ~rOm| H$mo A Hw$[aV H$aZm MmhVm h & BgHo$ {bE Mma MaUm| H$mo C{MV H $_ _| {b{IE Vm{H$ dh ghr T> J go `moJ H$mo H$a gHo$ & AWdm ZrMo {XE JE AmaoI H$mo nhMm{ZE Am a Bg na A {H$V ^mJm| A, B Am a C Ho$ Zm_ {b{IE : 2 2 A B C 31/1/1 13 P.T.O. A student wants to germinate dicot seeds. Write the four steps in correct sequence that will help him to perform the experiment in the right way. OR Identify the following diagram and name the parts marked as A, B and C : A B C 25. Xem B JB m`mo{JH$ `d Wm _|, (a) bKw naIZbr _| ^ao nXmW X Am a e dmH$ma bm H$ _| Vbr _| aIo nXmW Zm_ {b{IE & (b) {ZH$mg Zbr _| Ob H$m Va D$na `m| CR> OmVm h ? {ZH$mg Zbr X Ob Y 31/1/1 14 Y H$m 2 In the experimental set-up shown, (a) name the material X filled in the small test tube and the material Y placed at the bottom of the conical flask. (b) why is there a rise in water level in the delivery tube ? Delivery tube X Water Y 26. (a) (b) (a) {H$gr N>m Zo Amo_ Ho$ {Z`_ H$mo g `m{nV H$aZo Ho$ `moJ _| `h nm`m {H$ {XE JE Eo_rQ>a _| Eo_rQ>a H$s gwB 12d| A e H$mo B {JV H$a ahr h & `{X Bg Eo_rQ>a _| 0 go 0 5 A Ho$ ~rM 10 {d^mOZ h , Vmo 12d| {d^mOZ Ho$ VXZ $n Eo_rQ>a H$m nmR> m H$ `m h ? Amn {H$gr {d wV n[anW _| Eo_rQ>a Am a dmo Q>_rQ>a H$mo {H$g H$ma g `mo{OV H$aVo h ? 2 In a given ammeter, a student saw that needle indicates 12th division in ammeter while performing an experiment to verify Ohm s law. If ammeter has 10 divisions between 0 to 0 5 A, then what is the ammeter reading corresponding to 12th division ? (b) How do you connect an ammeter and a voltmeter in an electric circuit ? 31/1/1 15 P.T.O. 27. ZrMo {XE JE AmaoI _| Xem B JB nm M Amn{VV {H$aUm| _| go {H$ ht Xmo Amn{VV {H$aUm| H$mo kmV H$s{OE Omo H$me Ho$ AndV Z Ho$ {Z`_m| H$m nmbZ H$aVo h E ItMr JB h Am a {OZH$m Cn`moJ {H$gr C mb b|g mam ~Zo {V{~ ~ H$s p W{V kmV H$aZo _| {H$`m Om gH$Vm h & BZ Xmo {H$aUm| H$m Cn`moJ {H$gr C mb b|g Ho$ F1 d 2F1 Ho$ ~rM p WV {H$gr {~ ~ Ho$ {V{~ ~ H$s p W{V, gmB O Am a H ${V kmV H$aZo _| H$s{OE & 2 AWdm CZ Mma MaUm| H$mo C{MV H $_ _| {b{IE {OZH$m nmbZ {H$gr X a W {~ ~ H$m {H$gr {XE JE C mb b|g mam Vr U {V{~ ~ m V H$aHo$ CgH$s \$moH$g X ar {ZYm [aV H$aZo _| {H$`m OmZm Mm{hE & 2 Out of the five incident rays shown in the following diagram, find any two incident rays that are obeying the laws of refraction of light and may be used for locating the position of the image formed by a convex lens. Use these two rays in finding the position, size and nature of the image formed when an object is placed between F1 and 2F1 of a convex lens. OR Write four steps in proper sequence which should be followed in the determination of focal length of a given convex lens by obtaining a sharp image of a distant object. 31/1/1 16

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