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(Model Question Paper) Class:10th Subject:Science Time:3 Hours

d{kk%& fo"k;%& le;%& iw. kkZ d %&

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¼1½ lHkh iz’u gy djuk vfuok;Z gSA ¼2½ iz’u Øekad 1 ls 6 rd vfry?kqmRrjh; iz’u gSa] izR;sd ij 2 vad gSA mRrj dh vf/kdre 'kCn lhek 30 'kCnA ¼3½ iz’u Øekad 7 ls 12 rd y?kqmRrjh; iz’u gSa] izR;sd iz’u ij 3 vad gSA mRrj dh vf/kdre 'kCn lhek 50 'kCnA ¼4½ iz’u Øekad 13 ls 17 rd Hkh y?kqmRrjh; iz’u gS] izR;sd iz’u ij 4 vad gSA mRrj dh vf/ kdre 'kCn lhek 75 'kCnA ¼5½ iz’u Øekad 18 ls 22 rd nh?kZ mRrjh; iz’u gSa] izR;sd iz’u ij 5 vad gSaA mRrj dh vf/kdre 'kCn lhek 150 'kCnA

iz’u 1&

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Maximum Marks :- 75

The PH value of solution A and B are respectively 4 and 12. which solution is acidic and which is alkaline.

iz’u 2&

iou mtkZ dh nks lhek,a fyf[k,A Write two limitations of wind energy.

iz’u 3&

ØsMk (CREDA) ds nks izeq[k mn~ns’; fyf[k,A Write two main aims of CREDA.

iz’u 4&

,d pkyd dk izfrjks/k 25 vkse gSA pkyd esa fdruh /kkjk izokfgr gksxh ;fn mls 20 oksYV foHkokarj okys Jksr ls tksM+k tk, \ How much current flows through a conductor wire of resistance 25 Ohm when connected across a source of potential difference of 20 volts? 63

iz’u 5&

ijkcSxuh fofdj.kksa ds 2 nq”izHkko fyf[k,A Write two hazardness of ultraviolet rays.

iz’u 6&

ikfjfLFkfrd ra= fdls dgrs gSa \ What is ecosystem ?

iz’u 7&

mRØe.kh; vfHkfØ;k fdls dgrs gSa \ bl vfHkfØ;k dh 2 fo’ks”krk,a fyf[k,A What do you mean by a reversible reaction ? Write any two characterestics of this reaction.

iz’u 8&

dksbZ rhu feJ /kkrqvksa ds uke] vo;o o ,d&,d mi;ksx fyf[k,A Write the name of any three alloys with their constituent ? also write one use for each.

iz’u 9&

vkDlhtu dh fuEu ds lkFk jklk;fud fØ;k fyf[k,%& (i) Hcl

(ii) H2S

(iii) NH3

Write the chemical reaction of the following with oxygen:(i) Hcl

iz’u 10&

(ii) H2S

(iii) NH3

fuEu fLFkfr;ksa esa dkSu lk niZ.k mi;ksx gksxk( ;fn (i) izfrfcEc okLrfod rFkk NksVk gksA (ii) izfrfcEc vkHkklh rFkk cM+k gksA (iii) izfrfcEc vkHkklh rFkk NksVk gksA In the following conditions which mirror will be used if (i) The image is real and small. (ii) The image is virtual and large. (iii) The image is virtual and small.

iz’u 11&

ekuo us= vkSj dSejs esa dksbZ rhu vlekurk,a fyf[k,A vFkok iw.kZ vkarfjd ijkorZu D;k gS \ bldh ‘krsZ fyf[k,A Write any three dissimilarities between Human eye and Camera.

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OR What is total internal reflection. Write its conditions.

iz’u 12&

izdk’k la’ys”k.k o ‘olu esa dksbZ 3 varj crkb;sA vFkok vkDlh ‘olu rFkk vukDlh ‘olu esa dksbZ 3 varj crkb;sA Write any three differences between photosynthesis and respiration. OR Write any three differences between aerobic and un-aerobic respiration.

iz’u 13&

gkbMªkstu cukus dh iz;ksx’kkyk fof/k dk o.kZu fuEu fcanqvksa ds varxZr dhft,& ¼1½ ukekafdr fp= ¼2½ jklk;fud lehdj.k Explain the Lab-method of preperation of Hydrogen in following points(1) Labelled diagram

iz’u 14&

(2) Chemical equation

(a) dSFkksM fdj.ksa tc fdlh /kkrq ij iM+rh gS rks og xeZ gks tkrh gSA D;ksa\ (b) X fdj.kksa ds 2 xq.k fyf[k,A (a) Why is a metallic piece heated, when cathod rayas strike against it (b) Write two properties of X-Rays.

iz’u 15&

ikni gkeksZUl D;k gS \ fdUnh nks ikni gkeksZUl ds uke ,oa mi;ksx fyf[k,A What are plant Harmons ? Write the name of any two plant Harmons with their uses.

iz’u 16&

:f/kj dk FkDdk fdl izdkj terk gS \ le>kb;sA vFkok fuEu tarqvksa ds mRlthZ vaxksa ds uke fyf[k, ¼1½ euq”;

¼2½ dsapqvk

¼3½ dhV

¼4½ vehck

Explain the process of blood clotting ? OR

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Write name of excretory organs of following animals. (1) Human

iz’u 17&

(2) Earth worm

(3) Insect

(4) Ameoba

lhesaV fuekZ.k fof/k dks fuEu ‘kh”kZdksa ds varxZr le>kb;s ¼1½ dPpk inkFkZ ¼2½ fuekZ.k fof/k vFkok dkap fuekZ.k fof/k dks fuEu ‘kh”kdksa ds varxZr le>kb;sA ¼1½ iz;qDr inkFkZ ¼2½ jklk;fud fØ;k Explain manufacture of cement under the following heads:(1) Raw material

(2) The process OR

Explain manufacture of glass under the following heads:(1) Raw material

iz’u 18&

(2) Chemical Reaction

¼v½ pqEcdh; cy js[kka, ,d nwljs dks D;ksa ugha dkVrh \ ¼c½ pqEcdh; j{kd D;k gS \ bldk fuekZ.k fdl izdkj fd;k tkrk gS le>kb;sA (a) Why the magnetic lines of force do not intersect each other. (b) What are magnetic keepers ? How they are formed ? explain.

iz’u 19&

eknk tuu ra= dk fp= lfgr o.kZu dhft,A Explain female reproductive system with the help of diagram.

iz’u 20&

LVksesVk ds can ,oa [kqyus dh fØ;k dks lfp= le>kb;sA vFkok thoksa esa gksus okyh iks”k.k izfØ;k ds pj.kksa dks laf{kIr esa le>kb;sA Explain the process of closing and opening of stometa with labelled diagram. OR Explain in brief the different steps of nutrition process in animals.

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iz’u 21&

‘khjs ls vYdksgy izkIr djus dh fof/k esa vkus okys fofHkUu pj.kksa dk jklk;fud lehdj.k lfgr o.kZu dhft,A vFkok fuEufyf[kr esa varj crkb;s& ¼1½ lkcqu vkSj viektZd ¼2½ ikWyh ,fFkyhu vkSj ikWyh okbfuy DyksjkbM In the process of obtaining Alcohal from molasses describe various steps along with the chemical equations OR Give the difference between the following(1) Soap and detergent. (2) Polyethylene and polyvinyl chloride.

iz’u 22&

dkap ds vk;rkdkj xqVds ls viorZukad Kkr djus dh fof/k dks fuEu fcanqvksa ds vk/kkj ij le>kb;sA ¼1½ js[kkfp= ¼2½ lw= ,oa fl)kar ¼3½ nks izeq[k lko/kkfu;k¡ vFkok lhlk lapk;d lsy dh cukoV lfp= le>kb;sA Explain the determination of refractive index of glass (as rectangular slab) on the basis of following points(1) Labelled diagram

(2) Principle & formula

(3) Two main precautions OR Describe the construction of lead accumulator with diagram. ********

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