Science 1

 

Set(1)

Grade: Ten                   FM: 75

Subject: Science                                                          Time: 2:15 hrs.

Candidates are required to give their answers according to the given instruction.

 

Attempt all the questions:

 

Group "A"15×1=15

1. Write short answer the questions.

a)  What is universal gravitational constant?

    ljZjJofkL u'?Tjfsif{0f cr/ eg]sf] s] xf] <

b) State Pascal's law. kf:snsf] lgod n]Vg'xf];\ .

   c) Write an equation to show nuclear fusion .

    Go'lSno/ ˆo'hgsf] ;lds/0f n]Vg'xf];\ .

d) What is meant by accommodation of eye?

    cfFvfsf] ;dfof]hg eGgfn] s] a'lemG5 <

e)  Define 1 unit of electricity. Ps o'lg6 wf/fljw'tsf] kl/efiff n]Vg'xf];\ .

f) What is the relationship between size of atoms and reactivity in case of non-metals?k/df0f'x?sf] cfsf/ / /f;folgs ;ls|otfsflarcwft'x?df s:tf] ;DaGw x'G5 <

g) Write an example of endothermic reaction.

    tfkzf];sk|ltls|ofsf] Pp6fpbfx/0f lbg'xf];\ .

h) Write down the structural formula of ethane and butene.Oy]g / Ao'6Lgsf] ;+/rgfTds ;'q n]Vg'xf];\ .

i)   Write any two adverse effects of chemical pollution.

    /f;folgs k|b'if0fsf] b'O{ j6f gs/fTds c;/ n]Vg'xf];\ .

j)   What is goiter? unufF8 eg]sf] s] xf] <

k) What is chromosomal disorder?qmf]df]hf]dn l8::c8{/ eg]sf] s] xf] <

l)   What type of asexual reproduction takes place in hydra and tapeworm?xfO8«f / 6]kjd{df s:tf] s:tf] k|sf/sf] cd}y'lgsk|hgg\ x'G5 <

m) Write the functions of pericardial fluid.

    k]l/sfl8{on ˆn'8sf] sfo{ n]Vg'xf];\ .

n) What is mutation?Do'6];g eg]sf] s] xf]<

o) What is ozone depletion? cf]hf]g Iflos/0f eg]sf] s] xf] <

 

Group "B"    13×2=26

2. Government of Nepal gives the subsidy in solar equipments. Why?g]kfn ;/sf/n] ;f}o{ phf{sf] pks/0fdf ;x'lnotlbPsf] 5 . lsg<

3. An egg sinks in pure water but floats in saturated solution of salt. Why?z'b\b kfgLdf cG8f 8'Ag] / g'gkfgLsf] ;Gq[Kt 3f]ndf cG8f plqg'sf] sf/0f pNn]v ug'{xf];\ .

4. Study the given transformer and answer the following questions.lrqdf b]vfOPsf] 6«fG;kmd{/sf] cWoogug'{xf];\ / tn ;f]lwPsfk|Zgx?sf] hjfkmlbg'xf];\ .

a. What type of transformer is it? Why?of] s:tf] k|sf/sf] 6«fG;kmd{/ xf] <lsg<

b.  Calculate the number of secondary coil.6fG;kmd{/sf] ;]s]G8/L kmGsfsf] ;ª\VofkTtfnufpg'xf];\ .

5. 10 bulbs of 40 watt each and 2 heaters of 1200 watt each are used for two hours daily. Find the units of electricity consumed in 30 days.^) jf6sf !)cf]6faNa / !@)) jf6sf @ cf]6f lx6/x? k|To]slbg @ 3G6fsf b/n] k|of]u ul/Psf] 5 . #) lbgdfvktx'g] o'lg6 kTtfnufpg'xf];\ .

6. Give the electronic configuration of magnesium in terms of sub shell. Write its block and period on the basis of your electronic configuration.;a;]nsf] cfwf/dfDofUg]l;odsf] On]S6f«]g laGof; ug'{xf];\ .  o;sf] cfwf/dfDofUg]l;odsf] Ans / lkl/o8 kQfnufpg'xf];\ .

7. Define homologous series. Write the homologous series of alkanes.  xf]df]nf]u; l;l/hsf] kl/efiff n]Vg'xf];\ . cNs]gsf] xf]df]nf]u; l;l/h n]Vg'xf];\ .

8. Write any two differences between thermo-plastic and thermo-setting plastics.ydf]{–Knfl:6s / ydf]{;]l6ª Knfl:6s larsf] s'g} @ j6f km/s n]Vg'xf];\ .

9. Why is catalyst used in chemical reaction? Write two examples of catalyst./f;folgs k|ltls|ofdfpTk]|/ssf] k|of]u lsgul/G5 <pTk]|/ssf] @ j6f pbfx/0fx? n]Vg'xf];\ .

10. Why hormones are called chemical messengers? Write the name of hormones secreted by adrenal gland. xdf]{gnfO{ /f;folgs ;+jfbbftfklg elgG5, lsg< Pl8«gn u|lGyn] pTkfbgug]{ xdf]{gsf] gfd n]Vg'xf];\ .

11. Write two differences between layering and grafting.

    n]ol/ª / u|flˆ6ª ljlwaLr @ j6f km/s n]Vg'xf];\ .

12. Write one-one function of queen bee and worker bee.

    efn] df}/L / sdL{df}/Lsf] !÷! j6fsfo{ n]Vg'xf];\ .

13. The normal blood pressure of human being is 120/80 mm of Hg. What does it mean?Pp6f ;fwf/0f dflg;sf] An8 k]|;/ !@)÷*)mm of HgeGgfn] s] a'lemG5 <

14. Write any four objectives of launching of artificial satellites into the space.cGtl/Ifdfs[lqdpku|xx? k7fpg'sf] s'g} $ j6f p2]Zox? pNn]v ug'{xf];\ .

 

Group "C"6×3=18

15. The mass of the Jupiter is 2×10²⁷kg and its radius is 6.5×10⁴km. What is the acceleration due to gravity on the Jupiter? Also, calculate the weight ofa person having the mass of 70kg on the Jupiter.olb j[x:kltsf] lk08 2×10⁷kg/ cw{Jof;6.5×10⁴km5g\ eg] j[x:kltsf] u'?Tjk|j]u slt x'G5 <70 kg lk08 ePsf] dflg;sf] tf}n To; u|xdfkTtfnufpg'xf];\ .

16. Answer the following questions on the basis of given table.

    tn lbOPsf] tflnsfcg';f/ ;f]lwPsfk|Zgx?sf] pTt/ n]Vg'xf];\ .

Substances	Sp. heat capacity
A	2100 J/kg/0C
B	910 J/kg/0C
C	138kg/0C

i)   If A, B and C are taken in equal mass and heated by giving equal heat, which one of them gains the maximum temperature and why? olb ;dfg lk08 ePsfA, B / CnfO{ ;dfgtfklbFbfs'gkbfy{n] a9L tfkqmdk|fKt u5{ / lsg<

ii)  Which one of them is suitable for cooling and heating purpose? Why?oLkbfy{x?dWo], s'gkbfy{ lr:ofpg / ttfpgpko'St x'G5 <lsg<

iii)           If equal mass of A and B are taken at 80⁰C and left to cool, which will be cooled faster and why?olb a/fa/ lk08 ePsf] A/ BnfO{ 80⁰ C ;DdttfP/ lr:ofpbf, s'gkbfy{ rfF8} lrl:;G5 / lsg<

17. Write any two ores of Iron. The external cover of aeroplane is made from aluminium instead of iron. Give two reasons.

kmnfdsf] @ cf]6fwfpx?sf] gfd n]Vg'xf];\ . xjfOhxfhsf] aflx/L cfj/0f kmnfdsf] ;6\6f PNd'lgodaf6 agfOPsf] x'G5 . @ cf]6fsf/0f n]Vg'xf];\ .

18. Why magnesium hydroxide and aluminium hydroxide are called antacids? Write the balanced chemical equation for the formation of acidic salt by the reaction between strong acid and weak base.DofUg]l;od xfO8f]cS;fO8 / PNd'lgod xfO8f]cS;fO8nfO{ PG6fl;8 elgG5 . lsg< s8f cDn / g/d Iff/sf] k|lts[ofaf6 aGg] cDnLo n+j0fsf] pbfx/0f ;Gt'lnt /f;folgs ;lds/0f¢f/f n]Vg'xf];\ .

19. What is vegetative propagation? Give any two points to show the importances of vegetative propagation.s[ltd k|hgg\ eg]sf] s] xf] < s[ltd k|hggsf] @ cf]6f dxTTjpNn]v ug'{xf];\ .

20. Explain the present scenario of air pollution in Kathmandu valley. Write any two control measures of air pollution.sf7df8f}F pkTosfdfxfnsf] jfo' k|b"if0fsf] cj:yfsf] af/]df j0f{g ug'{xf];\ . jfo' k|b"if0f lgoGq0f ug]{ @ cf]6f pkfox? n]Vg'xf];\ .

 

Group "D"    4×4=16

21. A convex lens has a focal length of 3cm. If a pencil is placed twice of its focal length then, Pp6f sGe]S; n]G;sf] s]Gb|Ls/0f b'/L 3cm 5 . olb s]Gb|Ls/0f b'/Lsf] bf]Aa/ b'/Ldf Pp6f k]lG;n /flvPsf] 5 eg]M

i)   Draw a clear ray diagram to show the formation of image of pencil.ls/0f /]vflrqlvr]/ k]lG;nsf] cfs[lt b]vfpg'xf];\ .

ii) Write the nature of image.        cfs[ltsf] k|s[lt n]Vg'xf];\ .

iii) Calculate the magnification of image.

    cfs[ltsf] la:t[tLs/0f kTtfnufpg'xf];\ .

iv) What is the power of lens?       n]G;sf] ;fdYo{ slt 5 <

22.Draw a neat and labeled diagram showing laboratory preparation of gas which is found in deep well and is acidic in nature. Also write the balanced chemical equation of chemical reaction of that gas formed. What happens when this gas is passed through slaked lime for a while?k|of]uzfnfdfulx/f] O{gf/df kfO{g] clDno u'0f ePsf] UofF; agfpg] ljlwsf] ;kmfgfdª\lstlrqsf]g'{xf];\ . pStUofF; aGbfx'g] /f;folgsk|lts[ofsf] ;Gt'lnt ;lds/0f klg n]Vg'xf];\ . pStUofF;nfO{ s]xL a]/;Ddr'gkfgLdf k7fpFbf s] x'G5 <

23.If the monohybrid cross between black male rabbit and white female rabbit takes place, all offspring of F₁ generation were black. Why were not white offspring seen in F₁ generation? Show this process with the help of chart up to F₂generation. Also write genotypic and phenotypic ratio of black and white rabbit in the second filial generation. sfnf] efn] v/fof] / ;]tf] kf]yL v/fof]sf] lardfdgf]xfOla|8 s|; u/fpFbfklxnf] j+zdfsfnf v/fof]x? dfq b]lvPeg] ;]tf v/fof] b]vf k/]gg\ lsg< bf];|f] j+z;Ddsf] rf6{ agfO{ k|i6 kfg'{xf];\ . pStj+zsf] lhgf]6fOk / lkmgf]6fOk cg'kftklgpNn]v ug'{xf];\ .

24.What is the time period of Mesozoic and Cenozoic Eras? Write the chief animals developed in those eras.  Write any two importance of fossils.d];f]hf]Os / ;]gf]hf]Os O/fsf] cjlwsltxf] <pSt O/fdfljsl;td'Vohgfj/x?sf] gfd n]Vg'xf];\ . hLjfjz]ifsf] @ cf]6f dxTjpNn]v ug'{xf];\ .

 

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