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ICSE Prelims 2018 : Physics (St. Josephs College (SJC), Allahabad)

3 pages, 55 questions, 36 questions with responses, 47 total responses,

Abhigyan Shanker
St. Joseph's College (SJC), Prayagraj / Allahabad

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PHYSICS SCIENCE Paper -I (Two hours) -1nsv,er,s to this Paper must be wrilten on the puper prorided seFaraie !,, You will not be alloi,ed to write during rhe _tirst lS nrinute; This time is to be spent in reading the Question paper. 7'ie t inte .qiten at the head of this Paper is the time allotted Jbr vt.iting :4c u,s\t ers. Section I i.s .orrtpulson. Attempt any four questions .fron Seuion IL The intende,l marksfor questions or parts oJ questions are gi"-en in brackets I J. SECTION I (40 I\AARKS) .!ftempt all questionsfrom this seoiott QUESTION 1' 110) (a) Calculate the kineti!- e:.':-1 oia Lt':y ..: ness 0.I kg and mon:::::-:: L. .: : I (b) State the energr trai.:sii::.:::ior in il:e ic:rL.!\:;1{: ii)dynamor:.,3;-r;,13 (c) Name a machine rtr:.:;i rri;bilo\ir:S L)3:': IIo change the oir+c::.-i .-i -..-:c: i:i r :o cbtain gain in speed. (d) Name two factors on s:icn lhe ret;-acr:r t :;ier of a medium Je-:ts. (e) When is the potenti3, ::rersr oiar o;c:l!:iir: :imple pendulurn ri, ::rimrm ( ij) minimum Ql ESTIO:\I 2r ( I0) .;, .\ ::jar sel:s a signal l..r an a.ropla:re a: a;:st::'rce 45 km a$a1 \\ith a speed 3x108 ms-1. After hou long is the signal received.back from tle seq|n*-- - , (b) Whar is lhe causc of r efracrion ol light i.r hen ir-passei llom ohe medium to another? (c) How does (d) (e) the angle olmitritrum deviation produced b1 a prism change with increase in (i) the wave length incident light and (ii) the refracrive angle of prism? Write the expression for the magnifying power ofa simple microscope. How can it be increased? State the condition under which the phenomcnon of resonance takes place. bursrrox s, of (r0) (a) which two properties are needed to make a given material suitable for making a fuse wire? (b) Suggest one way. in each case, by which rve can detect the presence of: (i) inliared radlation (ii) ultraviolet radiation. (c) Differentiate between the forced and resonant vibrations. (give only two differences) (d) Name two factors on whjch intemal resistance ofa cr'll depend and state how does it depend Dn the thctors stated by you? (e) A mixture ofradioactive (i) (ii) substance gives offradiations. Name the radiarion which travels with the speed ofiighr. Name the radiation rvhich has the highest ionizing powcr. QUESTION (10) (a) Define the term resislivity and slate its SI unit. (b) Draw the diagram of a simple circuit that may be used for verifl,ing Ohm.s law. (c) Cive reason why switch is always connected in series rvith a iive wire. (d) Complete the follorving nuciear reaclions ( i) (ii) ,P'-r ,rU"'* (e) A device PI]Y CI, X PC I,] 0u - :--n6Thlla + ------ + gngpgy is used to transfonn l2V a.c. to 220V a.c. ti) Name the device (ii) name the principle on which it works, SECfiO\_|I({0mark) hu q,cslions in thk sectiotl Anemq aal QUESTION 5: (a) A unilorm meter scale is bala xhsr *sish15 or25 grand mark respecrivetv. calcurate I0 gfare suspended at 5 the rveighr er6!* ur cm and of meter ILtrLcr scae. scae A body faris freeiy ",,",,,,,.::".1.:l-1? under gra. rest name tl," iir"J of (3) ener8}..invilr possess: at the point from uhere a*he i it la lls (3) ",,:1.'::,T rrhire falting ": t* TT:j::!:",:rf. (r) (b) If ] iIt) f 7S on reaching the ground. (c) A block and tackle system ofpulleys has a velocity ra:io 5. nraw. a labeled diagram ofthe system indicaring crearrl the points ofapprication and direction ofroad and What is the value ofthe mechanicai advantage ofrhe given pulley system if it is an ideal puJley system. ::l (ii) (4) QUESTION 6: (a) Stud), rhe diagram given below. (i) Name the Iens LL,. What are the poinrs O. O, caited? State three characteristics ofimage. !ll) (iii) ^. one (b) Give use ofeach ofthe follorvinf vrrruw"'.urcrrc radiatio - ' "'s electromagnetic radlatlons (i) microwaves (ii) ultra'ioret radiations (iii) iirfrared radiations. {c) A ray oflight pe ,toung (i) ii) r is incidenr r iti","igin";;ili,. il.1Jjl::T::iT';:equiraterar write the angles of ir.id.n ,;.";;;ffi;XtJ..the Name the phenomenon * hich the ."l' or rient ,uil.'ai tre .; B The critical angle for glass-air is 450. PHY CL X PG ].] grass prism. comprete rhe *, prism. face aB, AC and BC of the prism. ai,e.:3j (4) UESTIOI (a) Calculale circuit' when (i) k is closed the reading olammeter in the given (ii) k is op'en' : iesisrance of 4 Q \\ hal u ould be the lenqlh I and area ofcross secuor A :r. haring materia) ofgiven rrire A (b) rI ) -of i : a'rC aJrtr L1: .rr\ss section 2A? er rr ire of same material having len$h unort .arlron.. cliffbr the to closer 'O On moving -: fires a gun He hears an tcl'i ]i.'r -conds. (c) rnun ,t-Ot in liont of a clilTand echo after 3 :i s' +i zi t ona uguin frring a gun' he hean an (i) iii) Calculate the sPeeC of sound and his initial Distance of the man ilom rhe cliffio QLESTION 8: j kg of leaC from 20 oC to 40 0C Calculate the specilir (a) io raise lhe temperature of 0 1300 J ofheat energl is supplied ful heat caPacitY of lead 0C' Find the final temperature oflhe mixture when all the ice ha at 30 liquid g ofa 300 to added is o0C so g ,p""in. heat capacity of water: 4 2 J g'r K-1 and "?'f.. liquid J'65 J g' rc:' (3) ,.-n.a. Given: specific heat capacity of ,- " specific latent heat of mclting ol'ice tt' (j) ""i - I16 J g" f in the secondary coil depends' which the magnitude ofinduced e m ,'r*urn. r*o factors on currenl and aitemating current' (ii)Give two differen"t' U"t*""n ait"tt QUESTION 9: (a) (b) (4) (3) depends' the magnetic field set up in-asolenoid State three factors on which series with mains of 220 v' ori,"r.ated 220 V, 100 w are connected in (3) Two lamps, one ratea zzJv, so'w"nJ,r," power' more consume lamp W 50 does Explain why ,-^^.r in r"^nr that the image formed is front ofconvex be placed i^f.nnvex lens so forro*ing ,*Jr, *n"re must an objecr ' (c) In each ofthe sotha (4) (i) (ii) (iii) (iv) At infinity Of same siz-e as the objecl lnverted and enlarged UPright and enlarged QUESTION 10: connecting (a)Namethematerialusedfor(i)heatingelementofanelectricheaterlii)filamentofaneleclricbulb(iii) wire. G) e n..l"r. (i) liil (iii) particle to change into Mg' 11Na2'emits a beta process lhe symbolic equation for the Write what are the number 24 and 1 I called with respect to r rNa:a' What is the g"n"'uinu*t of 11Mg2t permanent magnet and an electromagnet' (c) State four differences between a PltY Cl- x PC.l-l (3) r1\ (4)

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