Kenya Certificate of Secondary Education (K.C.S.E.)
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1 Name: Index No.. Candidae s Sign.... Dae:... Kenya Ceificae of Seconday Educaion (K.C.S.E.) 232/2 PHYSICS JULY/AUGUST 2014 TIME: 2 HOURS 232/2 Phycs 2 2 hou INSTRUCTIONS TO THE CANDIDATES: Wie you name and index numbe in he sces povided above This cons of wo cions A and B. Answe all queions in cion A and B in he sces povided. All woking mu be clealy shown in he sces povided. Mahemaical ables and non pogammable len eleconic calculao may be ud. Examine U Only CTION QUESTION MAXIMUM SCORE A B TOTAL 80 CANDIDATE S SCORE This cons of 8 pined ges. Candidaes should check o asceain ha all ges a pined as indicaed and ha no queions a misng. 1
2 CTION A (25MKS) Answe all queions in his cion Figu 1 below shows a negaively chaged objec susnded ung a had. A glass od was ubbed ung a woolen cloh and hen bough clo o he objec 1. Glass od Thad Chaged objec Sae he obvaion made when a ubbed glass od is bough clo o he objec 2. In he figu below he lamps in he wo cicuis A and B a idenical and he cells have he same elecoive foce. A Lamp B Explain why he lamps in B may glow bighe han ho in A when he cicuis a clod a he same ime 3. Figu 2 shows an objec placed in on of a convex lens of focal lengh 10cm (a) Cplee he ay and ae he ze of he image fomed (b) Sae one applicaion fo he above aangemen 2
3 (a) A css ndles is placed below a cun caying conduco as shown below Conduco 4. Indicae on he diagam he dicion of he cun (b) Sae he diffence bewn a sof magneic maeial and had magneic maeial 5. (a) Define difacion wih sc o waves (b) In he diagam below he ze of he au a he baie is 10cm while he diance bewn wo concuive wave ons is 3cm. if he waves a moving owads he baie, daw he wave ons as hey apa afe sng hough he au Baie Wave on 3
4 The figu below shows a up ud o udy sound waves 6. Cok Wi Bole Meal plae Ai I is obved ha when he bole is shaken sound he meal plaes is head. Sae and explain he obvaion ha would be made if a ho wae is poud ino he bole han he cok is ighly placed and he bole shaken 7. A ligh bulb is found o have a ance of 800Ω when oaing nomally on 220 vols mains. Find: (a) The powe aing of he bulb (b) The value of he mo suiable fu fo he bulb 8. The following a of he elecagneic adiaions: Ula viole, fm waves, infad, sho adio waves and mico waves (i) Aange he adiaions in hei ode of incang wavelenghs (ii) Sae one u of micowaves 4
5 An alenaing volage of ak value 15V and equency 25Hz is applied o he eminals of a cahode ay 9. oscillosco. The Y-gain is a 5v/cm and he ime ba a 10ms/cm. daw he ace obved an he scn (3mks) 1cm 1cm 10. A ance wi is 2m long and has a coss cional aa of 0.50cm3. if he ance is 2.6Ω, calculae is iviy (3mks) CTION B (55 MARKS) 11. (a)(i) Sae wo condiions fo oal inenal flecion of ligh (ii) Figu 6 shows a ay of ligh avelling hough medium 1 o ai Ai Medium 1 40o 5
6 Calculae he acive index of he medium (b) Figu 6 shows a human eye wih a defec Objec (i) Idenify he defec (ii) Explain how he defec could be coced (iii) Daw a suiable diagam o show he cocion of he defec (c) Ouline wo diffences bewn he lens in camea and he human eye 12. (a) Define 1Amphe (b) Figu 7 shows a ngle cell oaf a lead acid accumulao R Lead Acid (i) Name he elecode labeled R (ii) Explain how he ae of chage in he cell can be eed (iii) Sae he main ason why he cell should no be lef in dischage condiions fo long 6
7 4v 1Ω 2Ω 3Ω (c) Figu 8 shows h o of values 2Ω,3Ω and 1Ω conneced in a cicui of 4 volages Deemine: (i) Effecive ance in he cicui (3mks) (ii) Cun hough he 3Ω o 13. (a) Wha do you undeand by he em muual inducion? (b) Sae wo faco ha deemine he magniude pf e.m.f induced in a coil (c) The diagam below shows an inducion coil ud o poduce sks Amau Conac C A B i) Name s labeled A and funcion of B (ii) Biefly explain how he inducion coil woks 7
8 (d) A ansfome is ud on a 240V a supply o delive 12A a 12A o a heaing coil. If 20% of enegy aken he supply is dised in he ansfome. Calculae he cun in he pimay coil. (a) Wha is an exinc mi conduco? 14. (b) Figu 9 shows a PN juncion diode ud in a flecion To C.R.O To C.R.O (i) Wha y of cificaion is shown? (ii) Descibe how he cificaion is achieved. (3mks) (iii) Sae wo disadvanages of he cificaion (iv) In he sce povided below, skech he oupu gnal displayed on he CRO duing he cificaion pocess 15. (a) Define he ems: (i) Wok funcion (b) Figu 11 shows Ua viole ligh iking a polished Zinc plae on a poively chaged gold leaf elecosco 8
9 Zinc plae Figu 11 UV ligh (i) Explain he obvaions ha he leaf did no fall. (ii) In eximen ung a phoocell, U.V ligh of vaying equency bu conan ineny was made o ike a meal suface. The maximum kineic enegy (KE max) of phooelecons fo each equency, f, was measud. The gaph shows how KE max vaies wih f Max. K.Ex Fx 1015Hz Given ha KE max= hf -Ǿ, deemine he values: (I) Conan h 9
10 (II) Conan Ǿ ae one cau (a) A.G.M ube may gie effec in he abnce of a adioacive souce. Explain his obvaions and 16. (b) A adioacive elemen A of half life 31 days decays o elemen B. a sample of A of mass 32g is kep in a conaine. Assuming B is able, calculae he mass of B ha will be in he conaine afe 124 days (3mks) (c) The figu below shows he feaus on an x-ay ube Vacuum Cop block Tungen Filamen (i) Why is a hick cop block ud a he anode (ii) Sae how he ngh of he X-ays can be incad (iii) X-ay ube oaes a 1000KV bewn he cahode and he anode. Calculae he maximum enegy of he X-ay poons poduced. (chage of an elecon, e=1.6x10-19c) 10
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