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1 CBSE-XII-017 EXAMINATION CBSE-X-008 EXAMINATION MATHEMATICS Series: RLH/ Paper & Solution Code: 30//1 Time: 3 Hrs. Max. Marks: 80 General Instuctions : (i) All questions are compulsory. (ii) The question paper consists of 30 questions divided into four sections A, B, C and D. Section A comprises of ten questions of.1 mark each, Section B comprises of live questions of marks each, Section C comprises of ten questions of 3 marks each and Section D comprises of five questions of 6 marks each (iii) All questions in Section A are to be answered in one word, one sentence or as per the exact requirement of the question. (iv) There is no overall choice. However, an internal choice has been provided in one question of marks each, three questions of 3 marks each and two questions of 6 marks each You have to attempt only one of the alternatives in all such questions. (v) In question on construction, the drawings should be neat and exactly as per the given measurement. (vi) Use of calculators is not permitted. SECTION A 1. Complete the missing entries in the following factor tree : Lets assume the missing entries be a, b b 37 1 a b 1 4. If (x + a) is a factor of x + ax + 5x + 10, find a. (x + a) is factor of the polynomial p(x) = x + ax + 5x + 10 p( a) 0 {By factor theorem} 1 / 3

2 CBSE-X-008 EXAMINATION ( a) a( a) 5( a) 10 0 a a 5a 10 0 a 3. Show that x = - 3 is a solution of x + 6x + 9 = 0. x + 6x + 9 =0 x.3 x (3) 0 ( x 3) 0 x 3 is the solution of x + 6x +9 =0 4. The first term of an A.P. is p and its common difference is q. Find its 10 th term. First term of an A.P. = p Common difference = q T P (10 1) q 10 T P 9q If tan A =, find the value of (sin A + cos A) sec A. 1 5 tan A 1 sina cos A sina cos Asec A cos A cos A tan A The lengths of the diagonals of a rhombus are 30 cm and 40 cm. Find the side of the rhombus. Length of the diagonals of a rhombus are 30cm and 40cm / 3

3 CBSE-X-008 EXAMINATION i.e., BD = 30 cm AC = 40 cm OD OB 15cm OA OC 0cm AOD OA OD AD (0) (15) AD AD 5cm Side of rhombus = 5 cm 7. In Figure 1, PQ II BC and AP : PB = 1 :. Find ar( APQ). ar( ABC) PQ BC 3 / 3

4 CBSE-X-008 EXAMINATION AP 1 PB PB AP 1 PB 1 1 AP 1 PB AP 3 AP 1 AP AB 1 3 ar( APQ) AP 1 ar( ABC) AB 9 8. The surface area of a sphere is 616 cm. Find its radius. Surface area of sphere = 616 cm 4r r 616 r 7 cm 9. A die is thrown once. Find the probability of getting a number less than 3. Total possible outcomes = 6 Outcomes which are less than 3 = 1, Probability 6 = Find the class marks of classes 10 5 and Class Class marks SECTION B Questions number 11 to 15 carry marks each. 4 / 3

5 CBSE-X-008 EXAMINATION 11. Find all the zeros of the polynomial x 4 + x 3-34x - 4x + 10, if two of its zeros are and -. p x x x x x 4 3 ( ) Lets assume other two zeroes are, Sum of all zeroes (1) Product of zeroes = 10...( ) 10 Substituting (1) in () ( 1 ) , 5 5, 6 Zeroes of the polynomial are 6,,, 5 1. A pair of dice is thrown once. Find the probability of getting the same number on each dice. Total outcomes Outcomes with same number on each = {(1, 1)(, )(3, 3)(4, 4)(5, 5)(6, 6)} No. of favorable outcomes = Probability If sec 4A = cosec (A - 0 ), where 4A is an acute angle, find the value of A. In a ABC, right-angled at C, if tan A = 1, 3 sec4acosec( A 0) sec4a sec(90 ( A 0))[sec(90 x) cosec x] sec Asec(110 A) 4A110 A 5A 110 A find the value of sin A cos B + cos A sin B. 5 / 3

6 CBSE-X-008 EXAMINATION In ABC, c 90 tan 1 tana 3 sinacosb cos AsinB sin( A B) sin(180 c) sinc sin Find the value of k if the points (k, 3), (6, -) and (-3, 4) are collinear. Given points (K, 3), (6, -), (-3, 4) are collinear Area of the triangle formed by these points = 0 1 k ( 4) 6(4 3) 3(3 ) 0 6k k E is a point on the side AD produced of a gm ABCD and BE intersects CD at F. Show that ABE ~ CFB. In ABE and CFB, A C (Opposite angles of a parallelogram) AEB CBF (Alternate interior angles as AE BC) ABE ~ CFB (By AA similarly criterion) SECTION C Questions number 16 to 5 carry 3 marks each. 16. Use Euclid's Division Lemma to show that the square of any positive integer is either of the form 3m or (3m + 1) for some integer m. Let s a be any positive integer and b = 3. We know a = bq + r, 0 r <b. Now, a 3 q r, 0 r / 3

7 CBSE-X-008 EXAMINATION The possible of remainder = 0, 1 or Case I a =3q a 9q 3 (3 q ) 3 m (where m 3 q ) Case II a = 3q+1 a (3q1) 9q 6q 1 3(3q q) 1 = 3m + 1 (where m = 3q q) Case III a = 3q + a (3q) 9q 1q 4 3(3q 4q 1) 1 = 3m + 1 (where m 3q 4q 1) From all the above cases it is clear that square of any positive integer (as in this a ) is either of the form 3m or 3m Represent the following pair of equations graphically and write the coordinates of points where the lines intersect y-axis : x + 3y = 6 x - 3y = 1 x3y6 x3y1 Graph of x + 3y = 6: When x= 0, we have y= and when y = 0, we have x= 6. Therefore, two points on the line are (0, ) and (6, 0). The line x + 3y= 6 is represented in the given graph. Graph of x - 3y = 1: When x= 0, we have y = - 4 and when y = 0, we have x = 6. Hence, the two points on the line are (0, - 4) and (6, 0). The line x - 3y =1 is shown in the graph. 7 / 3

8 CBSE-X-008 EXAMINATION The line x + 3y = 6 intersects y-axis at (0,) and the line x - 3y = 1 intersects y-axis at (0, - 4). 18. For what value of n are the n th terms of two A.P.'s 63, 65, 67,... and 3, 10, 17,... equal? If m times the m th term of an A.P. is equal to n times its n th term, find the (m + n) th term of the AP. n th term of 63, 65, 67,.. 63 ( n 1)() 63 n 61 n...(1) n th term of 3, 10, 17,. 3 ( n 1)7 3 7n 7 7n 4...() Given that n th terms of two AP s are equal. (1) = () 61 n7n4 65 5n n 13 Lets assume first term = a Common difference = d T a ( m 1) d m T a ( n 1) d n Given m. T n. T m n 8 / 3

9 CBSE-X-008 EXAMINATION m( a ( m 1) d) n( a ( n 1) d) ma m( m 1) d na n( n 1) d ( m n) a d( m m n n) 0 a( m n) d( m n)( m n 1) 0 ( m n)[ a ( m n 1) d] 0 m n a ( m n 1) d 0 Tm n In an A.P., the first term is 8, n th term is 33 and sum to first n terms is 13. Find n and d, the common difference.. First term (a) = 5 T 33 n Sum of first n terms = 13 n a T n 13 n n 6 T a ( n 1) d n 33 8 (5) d d 5 0. Prove that : (1 + cot A + tan A) (sin A cos A) = sin A tan A cot A cos A. Without using trigonometric tables, evaluate the following : cos58 cos38 cosec5 3 sin3 tan15tan 60tan 75 (1 cos A tan A)(sin A cos A) 1 sina 1 tan A 1cos A tan A cos A 1 tan A tan A tan A 1 cos A tan A 3 tan A1 cos A tan A tan Acos A cot Acos A sina tan A..cos A cot Acos A cos A sinatan A cot Acos A 9 / 3

10 CBSE-X-008 EXAMINATION cos 58 cos38cosec7 3 sin3 tan15tan60 tan75 tan75 cot(90 15 ) cot15 tan15tan75 1, tan60 3 sin3 cos 58, cos38 sin7 sin3 cos38sec38 3 sin If P divides the join of A(-, -) and B(, -4) such that AP 3, AB 7 find the coordinates of P. AP 3 AB 7 As, AB = 7, AP = 3 AB AP PB 7 3 PB PB Let the point P(x, y) divide the line segment joining the points A(, ) and B(, 4) in the ratio AP : PB = 3:4 (3) ( )(4) ( 4)(3) (4)( ) x and y x and y x and y The coordinate of P( x, y), 7 7. The mid-points of the sides of a triangle are (3, 4), (4, 6) and (5, 7). Find the coordinates of the vertices of the triangle / 3

11 CBSE-X-008 EXAMINATION Consider a ABC with A(x 1, y 1 ),B(x, y ) and C(x 3, y 3 ). If P(3, 4), Q(4,6) and R(5,7) are the midpoints of AB, BC and CA. Then, x1 x 3 x1 x 6...(i) y1 y 4 y1 y 8...(ii) x x3 4 x x3 8...(iii) y y3 5 y y3 1...(iv) x3 x1 6 x3 x (v) y3 y1 7 y y (vi) Adding (i), (ii) and (v) we get ( x x x ) x x x 1...(iv) 1 3 From (i) and (vii), we get x = 6 From (iii) and (vii) we get v 1, = 1-8 = 4 From (v) and (vii), we get x = 1-10 = Now, adding (ii), (iv) and (vi), we get 0(y 1 + y + y 3 )= = 34 y1 y y3 17 (viii) From (ii) and (viii), we get y 3 = 17-8 = 9 From (iv) and (viii), we get y 1 = 17-1 = 5 From (vi) and (viii), we get y = = 3 Hence, the vertices of ABC are A (4, 5), B(, 3), C(6, 9) 3. Draw a right triangle in which the sides containing the right angle are 5 cm and 4 cm. Construct a similar triangle whose sides are 5 3 times the sides of the above triangle / 3

12 CBSE-X-008 EXAMINATION Steps: 1) Draw a line segment AB = 5 cm, Draw a ray SA making 90 with it. ) Draw an arc with radius 4 cm to cut ray SA at C. Join BC. ABC is required 3) Draw a ray AX making an acute angle with AB, opposite to vertex C. 4) Locate 5 points (as 5 is greater in 5 and 3), A 1, A, A 3, A 4, A 5, on line segment AX such that AA = A 1 A = A A 3 = A 3 A 4 = A 4 A 5 5) Join A 3 B. Draw a line through A 5 parallel to A 3 B intersecting line segment AB at B. 6) Through B, draw a line parallel to BC intersecting extended line segment AC at C. AB' C ' is the required triangle. Justification: The construction can be justified by provided that AB' AB, B' C ' BC, AC ' AC In ABC and AB' C', ABC AB' C ' (Corresponding angles) BAC B' AC ' (Common) ABC ~ AB'C' (AA similarly criterion) AB BC AC...(1) AB' B' C ' AC ' AA B and AA B', In 3 5 A AB (Common) 3 A5 AB' AA B (Corresponding angles) 3 AA5 B' AA B (AA similarly criterion) 3 ~ AA5 B' 1 / 3

13 CBSE-X-008 EXAMINATION AB AA3 AB' AA5 AB 3...() AB' 5 On comparing equations (1) and (), we obtain AB BC AC 3 AB' B' C ' AC ' AB' AB, B' C ' BC, AC ' AC This justifies the construction. 4. Prove that a parallelogram circumscribing a circle is a rhombus. In Figure, AD BC. Prove that AB + CD = BD + AC. Given ABCD is a 9m such that its sides touch a circle with centre O. AB = CD and AB CD, AD = BC and AD II BC Now, P Q, R and S are the touching point of both the circle and the 9 th We know that, tangents to a circle from an exterior point are equal in length. AP = AS [Tangents from point A]... (1) BP = BQ [Tangents from point B]...() CR = CQ [Tangents from point C]..(3) 13 / 3

15 CBSE-X-008 EXAMINATION Given AC = AB = 14 cm BC cm Area of shaded region = Area of semi-circle (Area of sector ABDC Area of 1 Area of cm ABC 1 Area of Quadrant ABC =..(14) 154 cm 4 7 Area of segment BC = ar (Quadrant ABC) ar( ABC ) cm Area of semicircle BC = cm 1 BC 1 Area of shaded region = Area of semicircle BC Area of segment BC cm ABC ) SECTION D Questions number 6 to 30 carry 6 marks each / 3

16 CBSE-X-008 EXAMINATION 6. A peacock is sitting on the top of a pillar, which is 9 m high. From a point 7 in away from the bottom of the pillar, a snake is coming to its hole at the base of the pillar. Seeing the snake the peacock pounces on it. If their speeds are equal, at what distance from the hole is the snake caught? 4 The difference of two numbers is 4. If the difference of their reciprocals is, find the two numbers. 1 Let AB be the pillar of height 9 meter. The peacock is sitting at point A on the pillar and B is the foot of the pillar. (AB = 9) Let C be the position of the snake which is at 7 meters from B. (BC = 7 and ABC = 90) As the speed of the snake and of the peacock is same they will travel the same distance in the same time Now take a point D on BC that is equidistant from A and C (Please note that snake is moving towards the pillar) Hence by condition 1 AD = DC = y (say) Take BD = x Now consider triangle ABD which is a right angled triangle Using Pythagorus theorem (AB + BD = AD) 9 + x = y 9 = y - x = (y-x)(y + x) 81/(y + x) = (y-x) y + x = BC = 7 Hence 81/7 = (y - x) = 3 y - x = 3 y + x = 7 Adding gives y = 30 or y = 15 x = 7 y = 1 Thus the snake is caught at a distance of x meters or 1 meters from the hole. Lets assume the two numbers to be x, y (y > x) Given that y x 4y 4 x...(1) 16 / 3

17 CBSE-X-008 EXAMINATION x y 1 y x 4 xy xy 1 xy 1 x(4 x) 1 x 4x 1 0 ( x 7)( x 3) 0 x 7, 3 y 3, 7 Numbers are 7, 3or 3, 7 7. The angle of elevation of an aeroplane from a point A on the ground is 60. After a flight of 30 seconds, the angle of elevation changes to 30. If the plane is flying at a constant height of m find the speed, in km/hour, of the plane. Height of aeroplane (CD) = 3600 BAD 60 and CAD 30 In ABE BE tan60 AE BE AE tan60 AE 3600 mt In ACD 3 mt = BE 17 / 3

18 CBSE-X-008 EXAMINATION CD tan30 AD AD AD mt BC AD AE BC 700 mt Speed of aeroplane distance time ms / 30 Speed (in km/hr) = 864 km/s 8. If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, prove that the other two sides are divided in the same ratio. Using the above, prove the following In Figure 4, AB II DE and BC EF. Prove that AC DF. Prove that the lengths of tangents drawn from an external point to a circle are equal. Using the above, prove the following : ABC is an isosceles triangle in which AB = AC, circumscribed about a circle, as shown in Figure 5. Prove that the base is bisected by the point of contact / 3

19 CBSE-X-008 EXAMINATION Construction: Join BE and CD and draw perpendicular DN & EM to AC and AD respectively. 1 EMAD ar( ADE) ar( BDE) 1 BDEM ar( ADE) AD...(1) ar( BDE) BD Similarly, 1 ABDN ar( ADE) ar( CDE) 1 EC DN ar( ADE) AE...() ar( CDE) EC But ar( BDE ) ar( CDE) (triangle on same base DE and between the same parallels DE and BC) Thus, equation () becomes, ar( ADE) AE...(3) ar( EDE) EC From equations () and (3), we have, 19 / 3

20 CBSE-X-008 EXAMINATION AD AE BD EC In the given AB DE and BC EF. Prove that AC DF. In OPE, AB DE (Given) By basic proportionality Theorem, OA OB...(1) AD BE Similarly, in OEF, BC EF (Given) OB OC...() BE CF Comparing (1) and (), we get OA OC AD CF Hence, AC DF [By the converse of BPT] Given: PT and TQ we two tangent drawn from an external point T to the circle C (0, r). To prove: 1. PT = TQ. OTP = OTQ Construction: Join OT. Proof: We know that a tangent to circle is perpendicular to the radius through the point of contact. OPT = OQT = 90 In OPT and OQT, OT = OT (Common) OP = OQ (Radius of the circle) OPT = OQT (90 ) OPT OQT (RHS congruence criterion) 0 / 3

21 CBSE-X-008 EXAMINATION PT = TQ and OTP = OTQ (CPCT) PT = TQ, The lengths of the tangents drawn from an external point to a circle are equal. We know that the tangents drawn from an exterior point to a circle are equal in length. AP = AQ (Tangents from A) (1) BP = RR (Tangents from B) () CQ - CR (Tangents from C) (3) Now, the given triangle is isosceles. so given AB = AC Subtract AP from both sides, we get AB- AP = AC-AP = AB AP = AC - AQ (Using (1)) BP = CQ BR = CQ (Using ()) BR = CR (Using (3)) So BR = CR, shows that BC is bisected at the point of contact. 9. If the radii of the circular ends of a conical bucket, which is 16 cm high, are 0 cm and 8 cm. find the capacity and total surface area of the bucket. (Use ] 7 Radius of the bigger end of the frustum (bucket) of cone = R = 0 cm Radius of the smaller end of the frustum (bucket) of the cone = r = 8 cm Height = 16 cm Volume = 1/3 h[ R r R* r] = 1/3*/7*16[ *8] = 35/1[ ] =(35*64)/1 = 19648/1 = cu cm Now, Slant height of the cone = I = ( R r) h 1 / 3

22 CBSE-X-008 EXAMINATION l (0 8) 16 l 1 16 l l 400 l 0 cm Slant height is 0 cm Now, Surface area = [ R r ( R r)*] = /7[ (0 + 8)*16] = /7[ ] = /7*91 = 0064/7 = sq cm 30. Find mean, median and mode of the following data : Classes Frequency Class Frequency class mark (x i ) x i f i fx 310 f i i i / 3

23 CBSE-X-008 EXAMINATION xf i i Mean f i Class f (less than) cumulative frequency n f i 50 n 5 Median class = n cf. M l h f 5 4 M M Mode: Maximum class frequency = 1 Model class = f1 f 0 Mode = l h f1 f0 f / 3

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CBSE-XII-07 EXAMINATION CBSE-X-009 EXAMINATION MATHEMATICS Series: HRL Paper & Solution Code: 0/ Time: Hrs. Max. Marks: 80 General Instuctions : (i) All questions are compulsory. (ii) The question paper

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CBSE-XII-017 EXAMINATION CBSE-X-01 EXAMINATION MATHEMATICS Paper & Solution Time: 3 Hrs. Max. Marks: 90 General Instuctions : 1. All questions are compulsory.. The question paper consists of 34 questions

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CBSE-XII-017 EXAMINATION MATHEMATICS Paper & Solution Time: 3 Hrs. Max. Marks: 90 General Instructions : (i) All questions are compulsory. (ii) The question paper consists of 31 questions divided into

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