Paper: 02 Class-X-Math: Summative Assessment - I

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1 1 P a g e Paper: 02 Class-X-Math: Summative Assessment - I Total marks of the paper: 90 Total time of the paper: 3.5 hrs Questions: 1] The relation connecting the measures of central tendencies is [Marks:1] A. Mode = 3 median + 2 mean B. Mode = 2 median + 3 mean C. Mode = 2 median - 3 mean D. Mode = 3 median - 2 mean 2] IF and are the zeroes of the polynomial 5x2-7x + 2, then sum of their reciprocals is: [Marks:1] A. B. C. D. 3] The value of sin2 30o - cos2 30o is : [Marks:1] A. B. C. D. 4] A rational number can be expressed as a terminating decimal if the denominator has factors. [Marks:1] A. 3 or 5 B. 2 or 3 C. 2,3 or 5 D. 2 or 5 5] Which of the following cannot be the sides a right triangle? [Marks:1] A. 400 mm, 300 mm, 500 mm B. 2 cm, 1 cm, cm C. 9 cm, 15 cm, 12 cm D. 9 cm 5 cm 7cm 6] Which of the following pair of linear equations is inconsistent? [Marks:1] A. 9x - 8y = 17; 18x -16y = 34 B. x - 2y = 6; 2x + 3y = 4 C. 5x - 3y =11; 7x + 2y =13 D. 2x + 3y = 7; 4x + 6y = 5 7] If one root of the equation (p + q) 2 x 2-2 (p + q) x + k =0 [Marks:1]

2 2 P a g e is A. 15 B. 50 C. -50 D. -15, then k is 8] If tan 2A = cot (A - 18o), then the value of A is [Marks:1] A. 27o B. 24o C. 18o D. 36o 9] The HCF and LCM of two numbers are 9 and 90 respectively. If one number is 18, find the other. [Marks:2] 10] In the following distribution: Monthly income range (In Rs.) No. of families Income more than Rs Income more than Rs Income more than Rs Income more than Rs Income more than Rs Income more than Rs Find the no of families having income range (In Rs.) ? 11] Prove that ] If fig. If A = B and AD = BE show that DE AB in ABC. [Marks:2] [Marks:2] [Marks:2] 13] From a quadratic polynomial whose one of the zeroes is - 15 and sum of the zeroes is 42. If and are the zeroes of the polynomial 2x2-4x + 5, then find the value of ² + ² 14] For what value of P will the following system of equations have no solution (2p - 1)x + (p - 1) y = 2p + 1; y + 3x - 1 = 0. 15] Find the mode of the following data: Class Frequency ] In fig. PQR and SQR are two triangles on the same base QR. If PS intersect QR at O then show that [Marks:2] [Marks:2] [Marks:3] [Marks:3] 17] Prove that 5 + is an irrational number. [Marks:3]

3 3 P a g e Prove that 18] Prove that: is an irrational number. [Marks:3] 19] Divide the polynomial p(x) by the polynomial g(x) and find the quotient and remainder. [Marks:3] 20] Find the mean of the following data: Class Interval Frequency Find the median daily expenses from the following data. Daily Expenses (in Rs.) No. of families Total 100 [Marks:3] 21] In an equilateral triangle ABC, D is a point on side BC such that 3BD = BC. Prove that 9AD2 = 7AB2. [Marks:3] 22] Ritu can row downstream 20 km in 2 hours, and upstream 4 km in 2 hours. Find her speed of rowing in still water and the speed of the current. Roohi travels 300 km to her home partly by train and partly by bus. She takes 4 hours if she travels 60 km by train and remaining by bus. If she travels 100 km by train and the remaining by bus, she takes 10 minutes longer. Find the speed of the train and the bus separately. 23] If sin + cos = m and sec +cosec = n, prove that n ( = 2m. 24] Find the cost of a jacket if the cost of two T-shirts and one jacket is Rs 625 and three T-shirts and two jackets together costs Rs [Marks:3] [Marks:3] [Marks:3] 25] Show that any positive even integer is of the form 6m, 6m + 2 or 6m + 4. Where m is some integer. [Marks:4] 26] The mean of the following distribution is 62.8 and the sum of the sum of all frequencies is 50. Compute the missing frequencies f1 and f2. Class Total Frequency 5 f1 10 f ] In fig, PA QB and RC are perpendiculars to AC. Prove that [Marks:4] [Marks:4] 28] Show that q (p2-1) = 2p, if sin + cos = p and sec + cosec =q. [Marks:4] 29] Find the other zeroes of the polynomial 2x4-3x3-3x2 + 6x - 2 if - and are the zeroes of the [Marks:4] given polynomial. 30] Prove that: [Marks:4]

4 4 P a g e Without using trigonometric tables, evaluate 31] State and prove Pythagoras theorem. Prove that the ratio of areas of two similar triangles is equal to the ratio of the squares of the corresponding sides. 32] During the medical check-up of 35 students of a class, their weights were recorded as follows: Weight (in kg) Number of students Less than 38 0 Less than 40 3 Less than 42 5 Less than 44 9 Less than Less than Less than Less than Draw a less than type ogive for the given data. Hence obtain the median weight from the graph. 33] Draw the graphs of the equations x - y + 1 = 0 and 3x + 2y - 12 =0. Determine the coordinates of the vertices of the triangle formed by these lines and the x-axis, and shade the triangular region. 34] Evaluate: [Marks:4] [Marks:4] [Marks:4] [Marks:4] Solutions paper set -2: 1] Mode = 3 median - 2 mean 2] 3] 4] A rational number can be expressed as a terminating decimal if the denominator has factors 2 or 5. 5] 9 cm 5 cm 7cm cannot form the sides of a right triangle as the Pythagoras theorem is not satisfied in this case.

5 5 P a g e 6] For the system of equations: 2x + 3y = 7 4x + 6y = 5we have Since is the condition for no solution and hence inconsistent system of equations. 7] Since is a root of the equation (p + q)2 x2-2 ( p + q) x + k =0 So, (p + q)2-2 ( p + q ). + k = 0 K = -15 8] 9] HCF LCM = Product of the number 9 90 = 18 x x = 10] Monthly income range (In Rs.) No. of families No. of families having income range (in Rs.) is 19. From the graph it is clear that median is 4. 11] LHS = 1 + = 1 + = 1 + cosec - 1 = cosec = = RHS 12] Since A = B, AC = BC (1)

6 6 P a g e Also AD = BE (2) Subtracting (2) from (1), AC - AD = BC - BE DC = EC (3) From (2) and (3), we have Therefore, DE AB by converse of BPT. 13] One of the zero =- 15 Sum of the zeroes = 42 Other zero = = 57 Product of the zeroes = = 855 The quadratic polynomial is x2-42x Let p(x) = 2x2-4x + 5?² +?²= (? +?)² - 2?? Substituting the values, we get =?² +?²= -1 14] For no solution: 15] Modal class = 30 fo = 12 fi = 20 f2 = 11 h = 10 3p - 3 = 2p 1 p = 2 Mode = + = 30 + = ] Construction: Draw PA QR and SB GR

7 7 P a g e (As one angle is 90 degrees and one is vertically opposite angles) From (1) and (2), we get 17] Let is rational number = 7 = = Since p and q are integers a rational number is rational But we know that is rational Out assumption is wrong 5 + is irrational. Let be a rational number

8 8 P a g e Let = p/q where q 0, p and q are integers and coprime. 7 q2 = p2 7 divides p Let p = 7m 7q2 = 49 m2 Q2 = 7m2 7 divides q2 7 divides q 7 divides p and q both. Which is a contradiction for the that p and q are co-prime. 18] LHS = = 19] Hence, LHS = RHS. = sin A cos A The polynomial p(x) can be divided by the polynomial g(x) as follows: Quotient = x - 3 Remainder = 7x 9

9 9 P a g e 20] Class Interval Fi frequency Mid value xi Fixi Total Mean = Daily expenses (in Rs) No, of families C.F Total 100 Median class f = 20 cf = 40 h = 20 l = 100

10 10 P a g e 21] Median = = = = 110 Construction: - Draw AE BC In right triangle AEB AB2 = AE2 + BE2 = AE2 + (BD + DE)2 = AC2 - DE2 + BD2 + DE2 + 2BD.DE = AD2 + BC2 + 2 BC BC = AD2 + BC2 9AB2 = 9AD2 + 2BC2 9AB2-2AB2 = 9AD2 AB = BC Or 9AD2 = 7AB2 22] Let the speed of Ritu in still water and the speed of stream be x km/h and y km/h respectively. Speed of Ritu while rowing upstream = km/h Speed of Ritu while rowing downstream = km/h According to the question, Adding equations (1) and (2), we obtain: 2x = 12 s0, x = 6 Putting the value of x in equation (1), we obtain: y = 4 Thus, Ritu s speed in still water is 6 km/h and the speed of the current is 4 km/h.

11 11 P a g e Let the speed of train and bus be u km/h and v km/h respectively. According to the question, Let and The given equations reduce to: Multiplying equation (3) by 10, we obtain: Subtracting equation (4) from equation (5), we obtain: Substituting the value of q in equation (3), we obtain: Thus, the speed of train and the speed of bus are 60 km/h and 80 km/h respectively. 23] Given: sin symbol("q", "?")q + cos symbol("q", "?")q = m and sec symbol("q", "?")q+cosec symbol("q", "?")q = n Consider, L.H.S. = n

12 12 P a g e = = = 24] Let the cost of one T-shirt be Rs x and that of one jacket be Rs y. According to given condition 2x+y=625 3x+2y=1125 (i) (ii) Multiplying (i) by 2 we get 4x+2y=1250 (iii) Subtracting (ii) from (iii) we get, x=125 Substituting this value of x in (i) we get 250+y=625 symbol("þ", "?")Þ y=375 Therefore cost of one T-shirt is Rs125 and the cost of one jacket is Rs ] Let a and b be any positive Integers a = b + r, 0 r <b Let b = 6 Thes r = 0,1,2,3,4,5 Where r = 0, a = 6m + 0 = 6m. which is even Where r = 1 a = 6m + 1 odd Where r = 2 a = 6m + 2 even Where = 3 a - 6m + 3 odd Where r = 4 a = 6m + 4 even

13 13 P a g e Where = 5 a - 6m + 5 odd All positive even integers are of the from 6m, 6m + 2 or 6m ] We have 5 + f f = 50 f1 + f2 = 20 f1 = 20 - f2 C.I fi Xi fixi fi 30 30fi fi fi Mean = Therefore, f2 = 20-8 =12. 27] In (1) Similarly

14 14 P a g e (2) From (1) and (2) xy = xz + yz Dividing by xyz 28] q = Consider, q (p2-1) = = 2p = RHS 29] Since = Zeroes of the given polynomial (x + ) (x - ) will be a factor Or x2 = 2 will be a factor Long division.

15 15 P a g e 2x2-3x+ 1 = 2x2-2x - 2x + 1 = 2x (x- 1) - 1(x - 1) = (2x - 1) (x- 1 ) The other zeroes are and 1. 30] On dividing the numerator and denominator of lts by cos, we get =

16 16 P a g e 31] Pythagoras Theorem: Statement: In a right angled triangle, the square of the hypotenuse is equal to the sum of squares of the other two sides. Given: A right triangle ABC right angled at B. To prove: that AC2 = AB2 + BC2 Construction: Let us draw BD AC (See fig.) Proof : Now, ADB ABC (Using Theorem:If a perpendicular is drawn from the vertex of the right angle of a right triangle to the hypotenuse,then triangles on both sides of the perpendicular are similar to the whole triangle and to each other) So, (Sides are proportional) Or, AD.AC = AB2 Also, BDC ABC (Theorem) So, Or, CD. AC = BC2 Adding (1) and (2), AD. AC + CD. AC = AB2 + BC2,, AC (AD + CD) = AB2 + BC2 AC.AC = AB2 + BC2 AC2 = AB2 + BC2 Statement:Ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding sides.

17 17 P a g e Given: Two triangles ABC and PQR such that To prove : Proof For finding the areas of the two triangles, we draw altitudes AM and PN of the triangles. Now, ar And ar (PQR) = So, Now, in B = Q (As And m = n (Each is of 90o) So, (AA similarity criterion) Therefore, Also, So, Therefore, [from (1) and (3)] = [From (2)]

18 18 P a g e = Now using (3), we get 32] The given cumulative frequency distributions of less than type is - Weight (in kg) upper class limits Number of students (cumulative frequency) Less than 38 0 Less than 40 3 Less than 42 5 Less than 44 9 Less than Less than Less than Less than Now taking upper class limits on x-axis and their respective cumulative frequency on y-axis we may draw its ogive as following - Now mark the point A whose ordinate is 17.5 its x-coordinate is So median of this data is ] x - y + 1 = 0 symbol("þ", "?")Þ x = y - 1 Three solutions of this equation can be written in a table as follows: x y x + 2y - 12 = 0

19 19 P a g e Three solutions of this equation can be written in a table as follows: x y Now, these equations can be drawn on a graph. The triangle formed by the two lines and the x-axis can be shown by the shaded part as: 34] We have = Cos (90o - 50o - ) - cos (40o - ) +

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