CBSE QUESTION PAPER. MATHEMATICS,(1)1d
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1 CBSE QUESTION PAPER MATHEMATICS,()d Class-XII Ti me allowed : 3 hours f.:mfftr'fffll:3 Maximum Marks: 00 '3icFi: 00
2 fll'll- : (i) frit.j/ff 3-/Re/Pf - I ( i i) JfFf W # 29 "JfFf - if rfi;r # t : 3, 'if" n2lt "ff" I 7ffe5 3f # 0 Jf'R" f # R q;r I 7ffe5 "al # 2 "JlR t # ihf R W ff I 7ffe5 "ff" # 7 JfR t "ff 9: qifl/ (iiij (iv) 7ffe5 3l -if "ffw m 3rf"( f!}n 'f!:qi qp.p;f w c/ i/cbrll mt, T'f JfFf W -if fctq;fq - ff. I ff!;( 'ft' WR: 3icif 'JIHi # np/t e9t 3icif 2 m -rt dllrftrcb Rieb?! # "ffw m -if # TJ}lj tr /# ffl r.firt ff I General Instructions : (i) (ii) (iii) (iv) (v) All questions are compulsory. The question paper consists of 29 questions divided into three sections A, B and C. Section A comprises of 0 questions of one mark each, Section B comprises of 2 questions of four marks each and Section C comprises of 7 questions of six marks each. All questions in Section A are to be answered in one. word, one sentence or as per the exact requirement of the question. There is no overall choice. However, internal choice has been provided in questions of four marks each and 2 questions of six marks each. You have to attempt only one of.the alternatives in all such questions. Use of calculators is not permitted. 2
3 3 SECTION A >fr fr lit # 0 rfcfi JfR' 3Tch W I Question numbers to 0 carry mark each.. Tiq Z 'tj( * fira» *, a* b =a+ b - 5 {TU, 'ffi fi * c6t Z "G' cifftl-lcfi fc.f- Q. I If the binary operation * on the set Z of integers is defined by a * b = a + b - 5, then write the identity element for the operation * in Z. 2. cot (tan- a + cot- a) f(.f@q. I Write the value of cot (tan- a + cot- a). 3. * A qlf A 2 =At, m (I + A) 2-3 A q)f ljr fc.full{ I If A is a square matrix such that A 2 = A, then write the value of (I + A) 2-3 A. 3
4 Write the value of the following determinant : If J ( \ ) e -x. dx = ftx) e -x. + c, then write the value of f(x). a 7. J 3x 2 dx = 8, ffl 'a' qif llr f("iforn: I a If J 3x 2 dx = 8, write the value of 'a'. 0 A A /\ /\ A A 8,. ( i X j ) k + ( j X k ) i cfit lfr f M I A A I\ I\ I\ I\ Write the value of ( i x j ) k + ( j x k).. Write the value of the area of the parallelogram determined by the I\ vectors 2 i and 3 j. I\ Write the direction cosines of a line parallel to z-axis.
5 SECTIONB JTR if&:rr # 22 acli JTR afqi cfit # I Question numbers to 22 carry marks each.. * ri x * ftx) = x + 3 ' m G lf fci; ri x * 3 6x- 3 fof(x) = x I f cfif Sl@<. cf<lt t? x If ftx) = --, x t:- -, show that fof(x) = x for all x -:t: - What is 6x- 3 3 the inverse off?. - ( 63 J. - ( 5 J - ( 3 J sin 65 = sin 3 + cos 5 cblmq, 2 tan- (sin x) = tan- (2 sec x), x * t 2 Prove that. - ( ) ( 5 - ( sin = sin 3' ) + cos ) Solve for x 2 tan -l (sin x) = tan -I (2 sec x), x -:;;. 7t 2 a 2a 3a a+b 3a+2b 6a+3b a+b+c a+3b+2c = a 3 0a+6b+3c 5
6 Using properties of determinants, prove that a 2a 3a a+b 3a+2b 6a+3b a+b+c a+3b+2c = a 3 loa+ 6b+ 3c If x m y 0 = (x + y ) m+n, prove that. 2 d 2 y (-x) - dx2 dy 2 X - - a y = 0. dx * xjl + y + y l + X = 0, - < X <, X -:t y, "ffi m cfilf-.iiq. fq; dy _ dx - - ( + x) 2 If y = - ea cos x, - x, show that If xjl + y + y JI+ x = 0, - < x <, x * y, then prove that dy _ dx - - ( + x) 2 6
7 2x 6. lf Q. f9i y = log ( + x ) - --, x > -, >I'@" x 2+x Show that y = log ( + x) - of x throughout its domain. 2x, x > -, is an increasing function 2+x Find the equation of the normal at the point (am 2, am 3 ) for the curve ay 2 = x 3. J x2 tan- x dx "J:fR chlfzilq J 3x- dx (x + 2) 2 Evaluate: J X 2 t an - X d X Evaluate J 3x- ( x + 2 )2 dx 7
8 8. f;fi:;j dlqcfift )cfi{oi cfil' cbf-.iiq. : [ e; _ ]: =, u O Solve the following differential equation y] [ e-2 -fx dx -.Jx - -Jx d y =, X :#; 0 9. dic:tcfi< ilcfi(oi "i:h c:qf Q. : 3 e x tan y dx + (2 - e x ) sec 2 y dy = 0, i F-f; X = 0 t, fil y = t t I Solve the following differential equation 3 e x tan y dx + (2 - e x ) sec 2 y dy = 0, given that when x = 0, t y =. -+ I\ I\ I\ -} " I\ I\ -} 20. a = 3 i + j + 5 k a:rt"{ (3 = 2 i + j - k t, m cf> ' '- = f3 + f32 -q cbf--ill!., a flliict{ t 'R?.IT 32, a ( qfl t I ---+ I\ " I\ ---+ /\ /\ /\ -+ If a = 3 i + j + 5 k and J3 = 2 i + J - k, then express P n ; the form J3 = 3 + 2, where is parallel to a and 32 s -+ perpendicular to a.,. -+ " I\ I\ -+ I\ /\ I\..:. ij M ( r. ( i - j + 2 k ) = 5 r. ( 3 i + j + k ) = 6 +I I a { t> I Find the vector and cartesian equations of the line passing through /\ /\ I\ the point P(l, 2, 3) and parallel to the planes r. ( i - j + 2 k) = I\ I\ /\ and r (3 i + j + k) = 6. 8
9 22. 'CfTm clit T.fR 3i9(9 I 7ffG 3lRT fiilh(9dl ljrt ' m Cf>clctlaTI cf> q;r Sllfcfidl cf,lm ' I r.l>t chlni(t I A pair of dice is thrown times. If getting a doublet is considered a success,. find the probability distribution of the number of successes and hence find its mean. SECTION C "JfR m llt 23 # 29 ffc6 JTR' 6 c/it! I Question numbers 23 to 29 carry 6 marks each. 2a. m fllicfi< 0, RcfiP "ffl : x - y + z = ; 2x + y - 3z = 0; x + y + z = 2 q,lf-jtq. t Using matrices, solve the following system of equations : x - y + z = ; 2x + y - 3z = 0; x + y + z = c;,f Q. % R q@ TI(i 3IBffi 3lf it> c?i ffi R t I 3 6 Show that the altitude of the right circular cone of maximum volume that can be inscribed in a sphere of radius R is R 3 9
10 25. w:rj:f T.t f:t, -q x 2 + y 2 =, x = J3 y x-3w AA cf>l MQ. I 6 Find the area of the region in the first quadrant enclosed by x-axis, the line x =.J3 y and the circle x 2 + y 2 =. 26. J (x 2 + x) dx c6t l"fr' <WIT mltt -ij ctlritq. I 6 t / cos 2 x dx cos 2 x + sin 2 x Evaluate f (x 2 + x) dx as a limit of a sum. Evaluate n/ J 0 cos 2 x cos 2 x + sin 2 x dx 27.,m (2,, - ) (-, 3, ) q@ flj.frh. cf;f fl'icfi{ui cblf\jfv,:. ftlio( x - 2y + z = 0 (; q t I,fl' G:tlf l{ % JfcfiR mtrr I\ A /\ I\ I\ A ft tt. r = - i + 3 j + k + A (3 i - 2 j - 5 k) cfit 3< t I,6 Find the vector equation of the plane passing through the points (2,, - ) and (- l, 3, ) and perpendicular to the plane x - 2y + z = 0. Also show that the plane thus obtained contains ---+ I\ A /\ /\ /\ /\ the line r = - i + 3j + k + 'A (3 i - 2j - 5 k ). 0
11 28. &i'-ytt $f, fjiftcnl -q cfil-it-cj>it 80 {ftlll.-t A (f?.tt 60 Hw-H B cfit I H-llll--i fqs;l;cil-3tt '[RT fi:r %if -ij dg( I ftj a, S m fi:r-wir -ij H' A d2lt 2 <tt.-i B t, f'-litt& 0 I ftj9fial T 7m: fi:r5>tut -q- <fllri A Uri B ' MBcfil I ftj htildtt S T - l T m m "ff CJlIB.:rn m? 3q{lrt, cfil.-i ftl? cfi\ cfllf-iiq, I 6 A company produces soft drinks that has a contract which requires that a minimum of 80 units of the chemical A and 60 units of the chemical B go into each bottle of the drink. The chemicals are available in prepared mix packets from two different suppliers. Supplier S had a packet of mix of units of A and 2 units of B that costs 0. The supplier T has a packet of mix of unit of A and unit of B that costs f. How many packets of mixes from S and T should the company purchase to honour the contract requirement and yet minimize cost? Make a LPP and solve graphically ctia\l 60% -$%i I cfil Gi % W-l % e-$fch7. cb" -75 ltt. I cfil -5 fcml!<iajtql TP-TT o -75 lft. I Sflfcfa cblf-;ii({ fcmt?.tt c-$q,) t I 6 In a certain college, % of boys and % of girls are taller than -75 metres. Furthermore, 60% of the students in the college are girls. A student is selected at random from the college and is found to be taller than 75 metres. Find the probability that the selected student is a girl.
CBSE QUESTION PAPER. MATHEMATICS,(1)1d
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