# SAMPLE QUESTION PAPER Class-X ( ) Mathematics. Time allowed: 3 Hours Max. Marks: 80

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1 SAMPLE QUESTION PAPER Class-X (017 18) Mathematics Time allowed: 3 Hours Max. Marks: 80 General Instructions: (i) All questions are compulsory. (ii) The question paper consists of 30 questions divided into four sections A, B, C and D. (iii)section A contains 6 questions of 1 mark each. Section B contains 6 questions of marks each. Section C contains 10 questions of 3 marks each. Section D contains 8 questions of 4 marks each. (iv) There is no overall choice. However, an internal choice has been provided in four questions of 3 marks each and three questions of 4 marks each. You have to attempt only one of the alternatives in all such questions. (v) Use of calculators is not permitted. Section A Question numbers 1 to 6 carry 1 mark each. 1. Write whether the rational number 7 will have a terminating decimal expansion or a 75 nor-terminating repeating decimal expansion.. Find the value(s) of k, if the quadratic equation 3. Find the eleventh term from the last term of the AP: 7, 3, 19,..., 65. 3x - k 3 x+ 4= 0 has equal roots. 4. Find the coordinates of the point on y-axis which is nearest to the point (, 5). 5. In given figure, ST RQ, PS = 3 cm and SR = 4 cm. Find the ratio of the area of PST to the area of PRQ. 6. If cos A =, find the value of tan A 5

2 Section B Question numbers 7 to 1 carry marks each. 7. If two positive integers p and q are written as numbers, then verify: LCM (p, q) HCF (p, q) = pq 3 3 p= a b and q = a b; a, b are prime 8. The sum of first n terms of an AP is given bysn = n + 3n. Find the sixteenth term of the AP. 9. Find the value(s) of k for which the pair of linear equations kx + y = k and x + ky = 1 have infinitely many solutions. 10. p If 1, 3 is the mid-point of the line segment joining the points (, 0) and 0, 9, then show that the line 5x + 3y + = 0 passes through the point ( 1, 3p). 11. A box contains cards numbered 11 to 13. A card is drawn at random from the box. Find the probability that the number on the drawn card is (i) a square number (ii) a multiple of 7 1. A box contains 1 balls of which some are red in colour. If 6 more red balls are put in the box and a ball is drawn at random, the probability of drawing a red ball doubles than what it was before. Find the number of red balls in the bag. Section C Question numbers 13 to carry 3 marks each. 13. Show that exactly one of the numbers n, n + or n + 4 is divisible by Find all the zeroes of the polynomial 5 5 and x + 6x - x - 10x- 5 if two of its zeroes are 15. Seven times a two digit number is equal to four times the number obtained by reversing the order of its digits. If the difference of the digits is 3, determine the number. 16. In what ratio does the x-axis divide the line segment joining the points ( 4, 6) and ( 1, 7)? Find the co-ordinates of the point of division. The points A(4, ), B(7, ), C(0, 9) and D( 3, 5) form a parallelogram. Find the length of the altitude of the parallelogram on the base AB.

3 17. In given figure 1 and NSQ MTR, then prove that PTS ~ PRQ. In an equilateral triangle ABC, D is a point on the side BC such that 1 BD BC. Prove that 9AD = 7AB In given figure XY and XY are two parallel tangents to a circle with centre O and another tangent AB with point of contact C intersecting XY at A and XY at B. Prove that AOB = Evaluate: cosec 63 tan 4 sin 63 cos 63 sin 7 sin 7º sec 63 cot 66 sec 7 (cos ec 65 tan 5 ) If sin cos, then evaluate : tan cot

4 0. In given figure ABPC is a quadrant of a circle of radius 14 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region 1. Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/h. How much area will it irrigate in 30 minutes, if 8 cm of standing water is needed? A cone of maximum size is carved out from a cube of edge 14 cm. Find the surface area of the remaining solid after the cone is carved out.. Find the mode of the following distribution of marks obtained by the students in an examination: Marks obtained Number of students Given the mean of the above distribution is 53, using empirical relationship estimate the value of its median. Section D Question numbers 3 to 30 carry 4 marks each. 3. A train travelling at a uniform speed for 360 km would have taken 48 minutes less to travel the same distance if its speed were 5 km/hour more. Find the original speed of the train. Check whether the equation 5x 6x = 0 has real roots and if it has, find them by the method of completing the square. Also verify that roots obtained satisfy the given equation. 4. An AP consists of 37 terms. The sum of the three middle most terms is 5 and the sum of the last three terms is 49. Find the AP. 5. Show that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. Prove that the ratio of the areas of two similar triangles is equal to the ratio of the squares of their corresponding sides.

5 6. Draw a triangle ABC with side BC = 7 cm, B 45, A 105. Then, construct a triangle whose sides are 4 3 times the corresponding sides of ABC. 7. Prove that cos sin 1 cosec cot cos sin 1 8. The angles of depression of the top and bottom of a building 50 metres high as observed from the top of a tower are 30 and 60, respectively. Find the height of the tower and also the horizontal distance between the building and the tower. 9. Two dairy owners A and B sell flavoured milk filled to capacity in mugs of negligible thickness, which are cylindrical in shape with a raised hemispherical bottom. The mugs are 14 cm high and have diameter of 7 cm as shown in given figure. Both A and B sell flavoured milk at the rate of ` 80 per litre. The dairy owner A uses the formula rhto find the volume of milk in the mug and charges ` 43.1 for it. The dairy owner B is of the view that the price of actual quantity of milk should be charged. What according to him should be the price of one mug of milk? Which value is exhibited by the dairy owner B? use The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is ` 18. Find the missing frequency k. Daily pocket allowance (in `) Number of children k 5 4 The following frequency distribution shows the distance (in metres) thrown by 68 students in a Javelin throw competition. Distance (in m) Number of students Draw a less than type Ogive for the given data and find the median distance thrown using this curve.

6 Marking Scheme Mathematics Class X (017-18) Section A S.No. Answer Marks 1. Non terminating repeating decimal expansion.. k = ±4 3. a 11 = 5 4. (0, 5) 5. 9 : Section B 7. LCM (p, q) = a 3 b 3 HCF (p, q) = a b LCM (p, q) HCF (p, q) = a 5 b 4 = (a b 3 ) (a 3 b) = pq 8. S n = n + 3n S 1 = 5 = a 1 S = a 1 + a = 14 a = 9 d = a a 1 = 4 a 16 = a d = (4) = For pair of equations kx + 1y = k and 1x + ky = a We have: 1 k b1 1 c1 k,, a 1 b k c 1 a For infinitely many solutions, 1 b1 c 1 a b c k 1 k 1 k 1, 1...(i) 1 k 1 k 3 and k 1 k 1...(ii) k 1 From (i) and (ii), k = 1 p Since 1, is the mid-point of the line segment joining the points (, 0) and 3 0 0, 9 therefore, p 9 1 p 3 3 The line 5x + 3y + = 0 passes through the point ( 1, 1) as 5( 1) + 3(1) + = 0 8 (i) P(square number) = 113 (ii) P(multiple of 7) =

7 1. Let number of red balls be = x P(red ball) = x 1 If 6 more red balls are added: The number of red balls = x + 6 P(red ball) = x 6 18 Since, x 6 x x There are 3 red balls in the bag. Section C 13. Let n = 3k, 3k + 1 or 3k +. (i) When n = 3k: n is divisible by 3. n + = 3k + n + is not divisible by 3. n + 4 = 3k + 4 = 3(k + 1) + 1 n + 4 is not divisible by 3. (ii) When n = 3k + 1: n is not divisible by 3. n + = (3k + 1) + = 3k + 3 = 3(k + 1) n + is divisible by 3. n + 4 = (3k + 1) + 4 = 3k + 5 = 3(k + 1) + n + 4 is not divisible by 3. (iii) When n = 3k + : n is not divisible by 3. n + = (3k + ) + = 3k + 4 = 3(k + 1) + 1 n + is not divisible by 3. n + 4 = (3k + ) + 4 = 3k + 6 = 3(k + ) n + 4 is divisible by 3. Hence exactly one of the numbers n, n + or n + 4 is divisible by Since 5 5 and are the two zeroes therefore, 3 3 is a factor of given polynomial. We divide the given polynomial by 3x x x (3x 5) x + x + 1 For other zeroes, x + x + 1 = 0 (x + 1) = 0, x = 1, 1 Zeroes of the given polynomial are 5 5,, 1and

8 15. Let the ten s and the units digit be y and x respectively. So, the number is 10y + x. The number when digits are reversed is 10x + y. Now, 7(10y + x) = 4(10x + y) y = x (i) Also x y = 3 (ii) Solving (1) and (), we get y = 3 and x = 6. Hence the number is Let x-axis divides the line segment joining ( 4, 6) and ( 1, 7) at the point P in the ratio 1 : k. 1 4k 7 6k Now, coordinates of point of division P, k 1 k 1 Since P lies on x-axis, therefore 7 6k 0 k1 7 6k = 0 k = Hence the ratio is 1: 6 : Now, the coordinates of P are,0 13. Let the height of parallelogram taking AB as base be h. Now AB = (7 4) ( ) units Area ( ABC) = 4( 9) 7(9 ) 0( ) sq units. Now, 1 AB h h 49 h = units SQN = TRM (CPCT as NSQ MTR) Since, P 1 = P PQR PRQ (Angle sum property) 1 = PQR PRQ 1 PQR (as 1 and PQR PRQ) 1 = PQR

9 Also = PRQ And SPT = QPR (common) PTS ~ PRQ (By AAA similarity criterion) Construction: Draw AP BC In ADP, AD AP DP AD AP (BP BD) AD AP BP BD (BP)(BD) 1 BC BC AD AB BC AD AB BC AB 9 9AD 7AB 18. Join OC In OPA and OCA OP = OC (radii of same circle) PA = CA (length of two tangents) AO = AO (Common) OPA OCA (By SSS congruency criterion) Hence, 1 = (CPCT) Similarly 3 = 4 Now, PAB + QBA = = = 90 AOB = 90 (Angle sum property)

10 19. cosec 63 tan 4 sin 63 cos63 sin 7 sin 7 sec63 cot 66 sec 7 (cosec 65 tan 5 ) = cosec 63 tan 4 sin 63 cos 63 cos(90 7 ) sin 7cosec(90 63 ) tan (90 66 ) cos ec (90 7 ) [cosec 65 cot (90 5 )] cos ec 63 tan 4 sin 63 cos 63 sin 7 cosec 7 = tan 4 cosec 63 (cosec 65 cot 65 ) 11 = 1 (1) sin cos (sin cos ) sin cos sin cos 1 sin cos 1 sin cos...(i) we know, sin cos 1...(ii) Dividing (ii) by (i) we get sin cos 1 sin cos 1/ tan cot 0. We know, AC = r In ACB,BC = AC + AB BC = AC ( AB AC) BC = r Required area = ar( ACB) + ar(semicircle on BC as diameter) ar(quadrant ABPC) 1 1 r 1 = r r r 4 r r r = 4 4 = r 196 cm 98 cm

11 1. Let the area that can be irrigated in 30 minute be A m. 1 Water flowing in canal in 30 minutes = 10,000 m 5000 m 3 3 Volume of water flowing out in 30 minutes = ( ) m m (i) 3 Volume of water required to irrigate the field = A m 100 (ii) Equating (i) and (ii), we get 8 A = A = m. l = Surface area of remaining solid = 6 l r rl, where r and l are the radius and slant height of the cone.. = = = ( ) cm = 68 So, the mode marks is 68. Empirical relationship between the three measures of central tendencies is: 3 Median = Mode + Mean 3 Median = Median = 58 marks

12 Section D 3. Let original speed of the train be x km/h. Time taken at original speed = 360 hours x Time taken at increased speed = 360 hours x Now, x x x x 5 5 x + 5x 50 = 0 x = 45 or 50 (as speed cannot be negative) x = 45 km/h Discriminant = b 4ac = ( ) = 76 > 0 So, the given equation has two distinct real roots 5x 6x = 0 Multiplying both sides by 5. (5x) (5x) 3 = 10 (5x) (5x) = (5x 3) = 19 5x 3 = 19 x = Verification: = Similarly, 5 6 = Let the three middle most terms of the AP be a d, a, a + d. We have, (a d) + a + (a + d) = 5 3a = 5 a = 75 Now, the AP is a 18d,,a d, a d, a, a + d, a + d,, a + 18d Sum of last three terms: (a + 18d) + (a + 17d) + (a + 16d) = 49 3a + 51d = 49 a + 17d = d = 143 d = 4 Now, first term = a 18d = 75 18(4) = 3 The AP is 3, 7, 11,, 147. [1½]

13 5. Given: A right triangle ABC right angled at B. To prove: AC = AB + BC Construction: Draw BD AC Proof: In ADB and ABC ADB = ABC (each 90 ) BAD = CAB (common) ADB ~ ABC (By AA similarity criterion) Now, AD AB (corresponding sides are proportional) AB AC AB = AD AC (i) Similarly BDC ~ ABC BC = CD AC (ii) Adding (1) and () AB + BC = AD AC + CD AC AB + BC = AC (AD + CD) AB + BC = AC, Hence Proved. Given: ABC ~ PQR ar( ABC) AB BC CA To prove: ar( PQR) PQ QR RP Construction: Draw AM BC, PN QR 1 ar( ABC) BC AM BC AM (i) ar( PQR) 1 QR PN QR PN In ABM and PQN B = Q ( ABC PQR) M = N (each 90 o ) ABM ~ PQN (AA similarity criterion) AM AB Therefore, (ii) PN PQ AB BC CA But ( ABC ~ PQR) (iii) PQ QR RP

14 ar( ABC) BC AM Hence, ar( PQR) QR PN from (i) AB AB = PQ PQ [from (ii) and (iii)] AB = PQ ar( ABC) AB BC CA ar( PQR) PQ QR Using (iii) RP 6. Draw ABC in which BC = 7 cm, B = 45, A = 105 and hence C = 30. Construction of similar triangle A BC as shown below: [3] 7. cos sin 1 LHS = cos sin 1 cos sin 1 cos sin 1 = cos sin 1 cos sin 1 = = (cos 1) sin (cos sin ) 1 cos 1 cos sin cos sin sin cos 1 cos cos = sincos cos (cos 1) = sin cos = cos 1 = cosec + cot = RHS sin

15 8. In BTP tan 30 TP BP Correct Figure 13 = TP BP BP TP 3 (i) In GTR, TR TR TR tan 60 = 3 GR (ii) GR GR 3 TR Now, TP 3 (as BP = GR) 3 3TP = TP + PR TP = BG TP = 50 m 5 m Now, TR = TP + PR = (5 + 50) m. Height of tower =TR = 75 m. Distance between building and tower = GR = TR 3 GR = 75 m 5 3 m 3 9. Capacity of mug (actual quantity of milk) = r h r 3 3 = r h r 3 = = cm 3 6 Amount dairy owner B should charge for one mug of milk = = ` Value exhibited by dairy owner B: honesty (or any similar value)

16 30. Daily pocket Number of Mid-point xi 18 f i u i allowance (in `) children (f i ) (x i ) u i = k 0 1 k f i = 40 + k f i u i = k 8 fu Mean = x a h i i fi k8 18 = k k = 8 Less than Number of Students [] [] Median distance is value of x that corresponds to Cumulative frequency N Therefore, Median distance = 36 m

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