UNIFIED COUNCIL An ISO 9001: 2008 Certified Organisation
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1 UNIFIED COUNCIL An ISO 900: 008 Certified Orgnistion STATE LEVEL SCIENCE TALENT SEARCH EXAMINATION CLASS - 0 Question Pper Code : US757 KEY. A. B. D 4. B 5. B 6. D 7. C 8. A 9. B 0. C. C. C. B 4. B 5. C 6. A 7. D 8. C 9. A 0. D. D. C. B 4. C 5. A 6. D 7. A 8. A 9. D 0. C. C. D. D 4. A 5. D 6. B 7. C 8. B 9. B 40. C 4. A 4. D 4. D 44. C 45. A 46. B 47. C 48. B 49. B 50. C 5. A 5. C 5. B 54. C 55. B 56. B 57. B 58. A 59. C 60. C MATHEMATICS. (A) Given log ten log 0 6 log 0 6 log log (B) Let log y x log x y Given SOLUTIONS ( ) ( ) 0 (OR) If ten log y x x y Given xy 44 y y 44 y 4 ( ) 4 y x y ( ) x y
2 If ten log y x x y y x But xy 44 x 4 44 x y 4 x+ y +4. (D) Given x x +x Squring on bot sides x + x x x 0, b, c x ( ) ± +4 ± (OR ) x.68 x lies between & 4. (B) AM of, sin 9 cos 7 tn 4 5. (B) LHS + cos 8 4 sin 7 4 cot 76 sin 9 cos 7 tn 4 + cos (90 9 ) 4 sin (90 7 ) 4 cot (90 4 ) sin 9 cos 7 tn 4 + sin 9 4 cos 7 4 tn (D) Since, b, c re in A.P b +c, b, c re in G.P b c +c c (+c) 4c ( c) 0 7. (C) Given c 0 c b c c b c b c α + β & αβ ( ) ( ) α β α+ β 4 αβ b c 4 ( α β) b b 4c 4c b 4c b 4c α β 8. (A) Given 6x 0 c αβ 6 9. (B) Solving x y & x + 4y 5 we get (, ) Slope of line joining (, ) & (, ) is y y m x x Let slope of line perpendiculr to m to m m m m m Eqution of te line psing troug (, ) Hving slope is y y m (x x ) y + (x + ) y + 6 x x + y + 7 0
3 0. (C) Distnce between O (0, 0) & P ( cosθ, sinθ) 7. (D) A (o, b) ( ) ( ) cosθ 0 + sinθ 0 cos θ + sin θ. (C) Given 0 6 ( 9 ) +79 ( ) + k ( 6 ) k 0 6k 0 6k k. (C) Given AC cm & AB cm BC 5 cm [ Q B 90 ] +b + c cm +cm + 5cm S 5cm Are of r ABC AB BC rs cm 5 cm r 5 cm 0 cm cm 5 cm. (B) Prllel lines re differ by constnt term only 4. (B) Given sec 8θ cosec 7θ sec 8θ sec (90 7θ) 8θ 90 7θ 5θ 90 θ 6 sin 0θ sin (C) X-xis divides te given line segment in te rtio y : y ( ) : : 6. (A) Volume of solid volume of pyrmid + volume of cuboid 5 4 cm + 5 cm 0 cm + 0 cm 50 cm B (o, o) D C (, o) Mid point of BC D,0 0 b b Slope of AD m 0 Mid point of AC Slope of BE m b, b Given m m b b b ± b E b 8. (C) f(x) x + x 5 f(x+) (x+) + (x+) 5 x + x + + x + 5 f( +) f( ) x x ( ) ( + 5 ) x x x x x x x x x x x + + ( x ++) x + +
4 9. (A) A 0. (D) D B In ADC, D 90 AC AD +(DB) AD + (BD + BC) AC AD + BD + BC + BC BD AC AB + BC + BC BD In ADB, D 90 AB AD +DB Q E 5 cm A B cm cm Given AB 8 cm & CD cm AD cm AE AB EB [Q const CD BE] 8 cm cm 5 cm C D C cm In ADE, AED 90 ED AD AE ED 44 ED cm BC ED cm n+ n n n+. (D) (n ) n n. (C) Given s n n + n s () + () 5 6 s ( ) + () t + t t s s , 9,, 7... t n + (n ) d 5 (n ) 4 (4n + ) 4. (B) cot 9 cot 6 cot (90 6 ) cot 6 tn 6 cot 6 tn 6 cot 6 (cot 45 ) b c, b, c re in GP 4. (C) In ABC, C90 AB AC + CB AB 5 cm Are of ABC AC CB AB CD cm 4 cm 5 cm CD cm CD 5 5. (A) πv c + 9v π πr ( πrl) +9 πr π r π r ( +r ) +9 π r r r r + r π π π π 0 PHYSICS 6. (D) Here, E V; E V; E 4 V nd r 4 Ω; r Ω; r Ω Suppose te currents I, I nd I flow from te tree cells s sown below. A B F I E I I E E Ten by pplying Kircoff s First lw t point A, we ve I + I + I 0...(i) Applying Kircoff s second lw to te closed prt ABCDA of te circuit, we ve I r I r E E or I 4 I or 4I I...(ii) Applying Kircoff s second lw to te closed prt ADEFA of te circuit, we ve I r I r E E or I I 4 or I I...(iii) r r r C E D
5 Solving te equtions (i), (ii) nd (iii), we obtin 7 I A; I A nd I 9 A 7. (A) A convex mirror lwys produces only virtul nd diminised imges of objects. 8. (A) Te focl lengt of te required concve lens is 60 cm. Power P.66 D f (D) Mgnetic field does not cnge wit cnge in dimeter of wire crrying current. 0. (C) Wen ligt ry trvels from one medium to noter medium, te more te ligt ry is refrcted wy from te norml, te lesser is te refrctive index of tt medium.. (C) Current flowing troug te lmp V R V 6 Ω A Power dissipted by te lmp VI 4 W. (D) All te given mirrors form virtul imge of rel object ccording to te given positions.. (D) A convex lens of focl lengt 50 cm is to be used., v u f 50 5 f + +,, 50 5 f 50 f 50 f f 50 cm 4. (A) Te deflection in te glvnometer occurs wen te mgnet is pused into te coil due to reltive motion between te two to induce emf. 5. (D) As per te given figure n i, sin i n r sin r, (.) sin 60 (.5) sin (r) 0 sinr, sinr 0.577, r 48.6 CHEMISTRY 6. (B) According to Hund s rule, electrons of p will be p p. x 7. (C) Te correct mtcing is -5, b-4, c-, d-, e- Te generl formul of : lknes is C n H n+. Te formul of Hexne - C 6 H 4, Etne - C H 6, Butne C 4 H 0. Alkenes ve generl formul C n H n. Te formul of Pentene is C 5 H 0 nd Hexene is C 6 H. 8. (B) Plster of Pris is used in ll te given pplictions. 9. (B) Let te given rtio of tomic weigts of X, Y, Z be 5x, x, 7x respectively. Sum of extreme elements (5x + 7x) 76 (given). x 76, x 76 8 At wt. of X , Y 8 88, Z (C) K + C N contins bot ionic nd covlent bonds. 4. (A) During polling process, wood gs reduces Cu O to Cu. Hence, it is employed for te removl of Cu O from Cu. 4. (D) mole of cetic cid rects wit mole of etyl lcool to form mole of ester. 4. (D) Clcium sulpte is n insoluble slt tt does not rect wit cidic soil nd increse its ph. 44. (C) Te correct mtcing is -, b-5, c-, d-, e-4 Dobereiner - Lw of trids Mendeleev - Periodic tble Neils Bor - Long form of periodic tble Linus Puling - Electronegtivity scle Newlnd - Lw of octves. y 5
6 45. (A) As per te given cemicl rection, Clcium crbonte on eting forms clcium oxide nd crbon dioxide gs is evolved. Te pysicl quntity required to form te given products is eting. Witout eting, te products re not formed. BIOLOGY 46. (B) Complementry bse of denine is tymine in DNA. 47. (C) Honey bees elp in pollintion. 48. (B) X represent synptic cleft. 49. (B) Ploem tissue is present benet te brk it crries sugrs. Due to te removl of outregions of tree ploem tissue get dmge nd te tree is deprived of sugrs. 50. (C) Euglen exibits mixotropic nutrition. 5. (A) Cromosome of sperm determines te sex of bby. It X of sperm fuses wit X of egg it results in XX bby girl. 5. (C) Arceopteryx is te connecting link between birds nd replits 5. (B) Sun grss Insects frog. 54. (C) Te procedure of clening blood using rtificil kidney mcine is clled dilysi. 55. (B) Te im of te given experiment is to prove tt crbon dioxide is estenilil for potosyntesis. CRITICAL THINKING 56. (B) P Q P is te wife of Q Q % R Q is te fter of R R T R is te broter of T T + S T is te sister of S Terefore, T is te dugter of P 57. (B) From te first two sttements, we know tt of te tree clsses, Clss A s te igest enrollment, so te tird sttement must be flse. 58. (A) All moters re women nd some moters nd some women my be engineers 59. (C) R 0, 988 V, 987 u, T 60. (C) ( ) 6 Te meteorologist recorded 6 dys. THE END 6
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