Nirman High School, Ahmedabad.A Non Nirma Initiative

Std : 10Sub.: Science &

(PART: A)Choose the correct option : (Each carries 1 mark)

1. Nano is a word from(a) Latin

langua'ge,(b) English (c) Greek

2. Metallic nanotubes can carry electric current ofcross section.(a) 106 (b) 10, (c) 1010

3. At what distance should an object be placed to obtain its virtual, erect and en-larged image ?(a) Beyond 2F(c) Between F and 2F

4. What is the type of the final image formed by the astronomical telescope ?

Marks: 100Date z 0310212014Time : 3 hours

Enslish MediumPreliminary Examination

5. Due to which phenomena a fine beam of sunlight that enters a smoke filled roombecomes visible ?

(a) Tyndall effect (b) scatter of light (c) colloidal particulates(d) Dispersion6. The focal length ofan eye lens is changed due to the action of

(a) pupil (b) retina (c) ciliary muscles (d) cornea7. In human eye, the image of an object is formed at

(a) Iris (b) Pupil (c) retina (d) cornea

(d) c/r

(d) n/a

B. The unit of electric potential difference is(a) J (b) l/c (c) JC

9. The unit of resistivity of material is

10. Who had first observed the magnetic effect of an electric current first ?(a) Faraday (b) Oersted (c) Volta (d) Ampere

11. How much current will flow through an electric heater having resistance equal to25O when connected to a 110 V line ?

(a) 11A (b) 4.4 A (c) 110 mA (d) s/11A12. Where magnetic field is maximum in current carrying a loop ?

(a) On the circumference of a ring.(b) On the centre of the ring.(c) At some distance of circumference of a ring.(d) None of these.

13. What is made from a mixture of carbon and graphite, used in TV, radio ?

(a) o (b) oz (c) at*

(a) Semi-conductors (b) resistors (c) battery14. Which current is used in cell phone ?

(a) Real, erect and diminished(c) Virtual, erect and magnified

(d) SpainAmpere per 1 cm2

(d) 10s

(b) Ar 2F(d) Between F and O.

(b) Virtual, inverted and diminished(d) Virtual, inverted and magnified

(d) insulators

(d) None(a) AC (b) DC (c) Both

15. "Heliocentric" model of universe was proposed by

(a) Ptolemy (b) John KePler(c) Galileo (d) Nicholus Copernicus

f O. Wnicfr of the following is not a satellite(a) rriton ' i;;;;" (c) Nerid (d) sheron

17. Comet's contains molecules of -=-'(a) co (b) nclrr (c) cn and gg @) co

and 961'r

18, A 4OO m thick, bright layer around the sunis known as

-'

(a) phorosphere "i[iair"."rphe_re (c)Terrestrial (d) None ofthese

19. Which of the following is a strong acid'? c acid(a) Tartaric acid 'iiiittinit'o (c) sulphuric acid (d) Acetir

20. Who was the scientist to propound proton transfer of acid base theory ?

(a) Robert Boyte "- jij*"lr,".r"ro (c) Arrhenius (d) Bronsted lowry

21. The pH valueof saliva is-_-'(a) 5.5 - 7.5

22, HrCO.+2NHoOH ->

(a) NarCO,

(b) 6.s - 7.s (c) 6.3 - 6.6 (d) 4's - s's+2HrO.

(b) (NH.),co3 (c) Na,co2 G) NH4(1H),

28. In cetalytic oxidation of ammonia mixture of l[H' and Q is passed over which

catalyst at 1073 K and NH, is oxidised to NO ?

(b) As (c) rr (d) re(a) V,O,

23. The refining of boron is carried out by ----'(a) Electrolysis (b) Zone refining method(c) Liquefaction (d) Reduction

zq.tiechemical formula of dolomite is _=.--'(a) caCO, $) caco(MgrL tcl caug(co')' (d) Casoo'2H'o

25. Which alloy is used to prepare Scientific balance ?

(a) Bronze iol *unn't" (c) Duralumin (d) steel26. Make correct Pairs'AB

(a) Ammonia gas (1) Used in antiseptic and fungicide'(b) Dihydrogen gas (2) Used in preservative injustice' jam'(c) Sulphur (3) In preparation of folic acid'(d) Sulphur dioxide gas (4) Used in W-elding of metals

(a) (a-3) tu-+l tc-rl ii-il !1]1"-') (b-1) (c-a) (d-3)(c) (a-a) to-sl t*rl iJ-ij . .(d) (a-3) (b-a) (c-2) (d-1)

27. In lead_charu". rn"aioa, iulphur dioxide is oxidised to sulphur trioxide by

(a) No, @) co, (c) &o (d) 'arto

29. Which is the Chief hydrocarbon in natural gas ?

(a) Methane (b) Ethane (c) Propane (d) Butane:0. W'nat is the commercial name of Ethyne ?

(a) Acrylic acid (b) acetylene (c) ethane (d) oxyaceytelene31. What is added to gasoline to increase its octane number

?

(a) Dimethyl lead (b)Triethyl lead (c)Tetraethyl lead (d) Pentaethyl lead

32. Petroleum is obtained by drilling in region of _

rock.(a) igneous (b) Sedimentary (c) Metamorphic (d) Porous

33. Only when controlled drug containing _

capsule is decomposed in thebody, then after effect of the drug realise from capsule starts.

(a) prupr (b) panv (c) pnva G) psva34. Which enzyme is used to obtain ethanol from molasses ?

(a) Lactase (b) Cellulose (c) Zymase (d) All the given35. Which polymer is used to prepare non-stick cooking vessels ?

(a) Polythene (b) Teflon (c) PVC (d) Polybutadience36. During respiration the exchange of gases takes place in

_.

(a) Bronchi (b) Alveoli , (c) Bronchioles (d) Trachea37. Which of the following structure is responsible for transportation of water in

higher plants ?(a) Sieve tube (b) Sieve cell (c) Vessel (d) Companion cell

38. Lymph contains _

as compared to that in the blood.

39. Transport of photosynthetic products in plants is known as _.

(a) Transpiration (b) Translocation (c) Transformation (d) Transversion40. In which organ ofthe body blood gets oxygenated ?

(a) Lungs (b) Heart (c) Kidney (d) Liver41. Which of the following hormones inhibits the growth of plants ?

(a) Auxins (b) Abscisic Acid (c) gibberellins (d) Cytokinies42.The spinal cord is originated from

_.

(a) lesser minerals(c) more carbohydrates

(a) Cerebrum(c) medulla oblongata

(b) lesser protein(d) more minerals

(b) Cerebellum(d) Pons

43. Which organ produces male gametes in flowers ?(a) Carpel (b) Stamen (c) Sepal (d) Aand B

44. Male and female gamete unite to form _.

(a) embryo (b) zygote (c) progeny (d) all45. Normal human has

_ number of chromosomes,

(a) 23 (b) 46 (c) 12 (d) 3146. The 'Kohlrabi' was developed out of

_ of the wild cabbage.

(a) large leaves (b) swollen parts (c) roots (d) sterile flowers47. Which bf the following is an edapic factor ?

(a) Light (b) Wind (c) Soit (d) Water48. One atom of chlorine can decompose *- molecules of ozone.(a) 1,00,000 (b) 10,000 (c) 1000 (d) 10,OO,OOO49. In Gujarat how many National Parks are there ?

(a) 21 (b) 12 (c) 4 (d) 4150. How much area of India is covered by forest ?

(a) 28.38 o/o (b) 23.38 o/o (c) 23.83 o/o (d) 28.83 o/o(PART : B)Section A

Answer the following in short. (2 marks each) 10(1) write four improvement expected in the future due to Nano technology.OR

Explain the benefits of Nanotechnology to the Health sector of human beings.

=(2) If an electric bulb is connected to 220 V line draws an electric current of 0'5 A

t" ';:; *r',"i *iii u" ilt"i"titiint" of filament of a bulb ?

(3) 'il;;t ;; Jo,iun pr"n"tt ? write their characteristics'(4) carculate rhe pH of aqueous sorution of 0.007 M Naorl'(log'07=0'8a51)'(S) exPtain Cracking reaction' 9B

What is isomerism ? Write isomers of butane and pentane'

Section BAnswer in short. : (2 marks each) -ri^n 10(6) Write a note on types of Heterotro.phic nutrition'

izi rxprain the flow "rlloo"i

in tt"utt' (figure is not required)t;i #;i; -tr," i,.npottu"nl!"i'ffi;'d;-'lfeans in process or evolution'

Write a not on HereditY'(9) Write industrial production ot Etnanor't;6ii;;;;;'t # r'""'"n"ld waste can be reduced ?

What is meant by Soap ? Write its pr-eparationSection CAn swe r th e f o I I owi ns q uesti on s lTllv.'

-(':.11?'['' rT :ll]rr" ne,,u. 1 s

i ili :llr I I H: ffil: ;l5ilL:ffi '

:: :Hil;ll" J', ii'# "r "'fi c gen"i.ato r-*itn

a

figure' 98Exblaintheoersted,Sexperimentfor-themagneticfieldresultingbyacurrentiuitvins straight conducting wire'

( 13) Explain chemicai pt"p"tti"i"f ailute. sulphu ric acid'(r+; exprain siri.g i#";T;i'"i*ti"n-ir'. inaurtrii ,"thod to prepare ethanolfrom' 'rii??!;

estertRcation u Exffuin the chemical equation of that reaction with example'

(15) Explain female reproductivd system' -Section D

Answer the following in detail (5 marks each) 15iidl out"i" lens formula for spherical lens.'.ti;i il;ti" pnv'itui'lni'Ii"'"""ii n'"n61es or metals with equations'

Give brief information about meta.l[Gy'(18) Describe tn" pioJ",i.o? nutrition in amoeba with labelled diagram

to show the

various steps of the nutrition in amoeba'

Explain human diges-tive. system raritfifi'e help of diagram and explain the pro-

cels of digestion of food in human'