DAV Public School, Jharsuguda

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1 DAV Public School, Jharsuguda QUESTIONS BANK CLASS-X Term-I Real Number (1Mark) 1.The LCM of two numbers is 760 and their product is Find their HCF. 2. Is it possible for the LCM and HCF of numbers to be 378 and 18 respectively? 3. Determine the values of p and q so that the prime factorisation of 2520 is expressible as 2 3 x 3 p x q x 7 3.Find the value of (-1) n + (-1) 2n + (-1) 2n+1 + (-1) 4n+1, where n is positive odd integer. 4. If = 2 3 x 3 m x 5 n x 7 2, find the value of m and n. 5. The decimal expansion of the rational number will terminate after how many places of decimals? 6. Find the least prime factor of a+b if the least prime factors of a and b are 3 and 7 respectively. 7. Explain why is a composite number. 8. If two positive integers a and b are written as a = x 3 y 2 and b = xy 3 ; x, y are prime numbers then find the HCF(a,b). 9. What is the LCM of p and q where p = a 3 b 2 and q = b 3 a 2? 10. A number N when divided by 15 gives the remainder 4. What is the remainder when the same number is divided by 5? 11. Euclid s division lemma states that for two positive integers a and b, there exist unique integers q and r such that a = b q +r. What condition r must satisfy? 12. After how many places of decimals will the decimal expansion of 23457/2 3 x 5 4 terminate? 13. State whether 6/200 has terminating or non-terminating repeating decimal expansion. 14. Find the (HCF LCM) for the numbers 50 and 20. (2Marks) 1. Show that any positive even integer can be written in the form of 6q,6q+2 or 6q+4 where q is an integer 2. Find the prime factorisation of the denominator of the of the rational number equivalent to If HCF(6,a) = 2 and LCM(6,a) =60 then find a. 4. Show that the numbers 143 and 187 are not coprime. 5. Determine whether the following number have a terminating decimal expansion or nonterminating repeating decimal expansion:. 6. If two positive integers x and y are expressible in terms of primes as x =p 2 q 3 and y = p 3 q, what can you say about their LCM and HCF. Is LCM a multiple of HCF? Explain. 7. Find the least number that is divisible by all numbers between 1 and 10 (both inclusive).

2 8. Given that HCF (306, 657) = 9, find LCM (306, 657). 9. What type of decimal expansion will 69/60 represent? After how many Places will the decimal expansion terminate? 10. Find the H.C.F. of the smallest composite number and the smallest prime number. 11. State Euclid s Division Lemma and hence find HCF of 16 and State fundamental theorem of Arithmetic and hence find the unique factorisation of Find the HCF of 867 and 255. Using Euclid s division algorithm. 14. given that LCM (26, 169) = 338, find HCF (26,169). 15. Express as product of its prime factors using factor tree. 16. Can the numbers 6 n, n being a natural number end with the digit 5? Give reasons. 17. Find the least number that is divisible by first five even numbers. (3Marks) 1. Show that n 2 leaves the remainder 1 when divided by 8, where n is an odd positive integer. 2. Use Euclid's division lemma show that the square of any positive integer is either of the form 5m,5m+1 or 5m+4 for some integer m. 3. If,find the values of m and n where m and n are non negative integers. Hence write its decimal expansion without actual division. 4.Prove that 3 is an irrational number. 5. A rational number in its decimal expansion is What can you say about the prime factors of q, when this number is expressed in the form? Give reasons. 6. If n is an odd integer, then show that n n 1 is divisible by Use Euclid s division algorithm to find the HCF of 441, 567, and Show that 12 n cannot end with the digit 0 or 5 for any natural number n. 9. On a morning walk, three persons step off together and their steps measure 40 cm, 42 cm and 45 cm, respectively. What is the minimum distance each should walk so that each can cover the same distance in complete steps? 10. Prove that one of any three consecutive positive integers must be divisible by For any positive integer n, prove that n 3 n is divisible by If d is the HCF of 45 and 27, find x and y satisfying d= 27 x +45 y. 13. Pens are sold in pack of 8 and notepads are sold in pack of 12. Find the least number of packs of each type that one should buy so that there are equal number of pen and notepads 14. Find the least positive integer which on adding 1 is exactly divisible by 126 and A boy with collection of marbles realizes that if he makes a group of 5 or 6 marbles at a time there are always two marbles left. Can you explain why the boy can t have prime numbers of marbles? 16. Show that 571 is a prime number. 17. Prove that no number of the type 4K + 2 can be a perfect square 18. Explain why and are composite numbers.

3 19. If the HCF of 210 and 55 is expressible in the form y then find y. 20. If a = 4q + r then what are the conditions for a and q. What are the values that r can take? 21.. What is the smallest number by which 5-3 be multiplied to make it a rational no? Also find the no. so obtained. 22. Prove that n 2 n is even for every positive integer n. 23. Prove that is an irrational number. 24. Show that 1/ 3 is irrational. 25.Find the greatest number of 6 digits exactly divisible by 24, 15 and Show that 9 n cannot end with the digit 2 for any n ϵ N. 27.Find the largest number which divides 318 and 739 leaving remainder 3 and 4 respectively. 28. Prove that is not a rational number. 29. Show that any positive odd integer is of the form 8q+1, 8q+3, 8q+5 or 8q+7, where q is some integer. 30. The following real numbers have decimal expansions as given below. In each case decide, whether they are rational or not. If they are rational and of the form, what can you say about the prime factor of q. (i) (ii) (iii) 0. (4Marks) 1. Is square root of every non square number always irrational? Find the smallest natural number which divides 2205 to make its square root a rational number. 2. Find HCF of 378,180 and 420 by prime factorisation method. Is HCF X LCM of the three numbers equal to the product of the three numbers? 3. If n is an odd integer then show that n 2 1 is divisible by Show that one and only one out of n, n+2 and n+4 is divisible by 3, where n is any positive integer. 5. Prove that cube of any positive integer is of the form 4m, 4m+1 or 4m+3 for some integer m. 6. Using Euclid s division algorithm, find which of the following pairs of numbers are co-prime: (i) 231, 396 (ii) 847, Show that cube of any positive integer is of the form 4m, 4m + 1 or 4m + 3, for some integer m. 8. Use Euclid s division lemma to show that the cube of any positive integer is of the form 9m, 9m + 1 or 9m The length breadth and height of a room are 8m 25cm, 6m 75cm and 4m 50cm respectively. Determine the longest rod which can measure the three dimensions of the room exactly. 10. Show that p + q is irrational, where p, q are primes. 11. Show that cube of any positive integer is of the form 4m, 4m+1 or 4m+3, for some integer m.

4 II. Polinomials (1Mark) 1. Write the quadratic polynomial having zeroes 1 and Write the quadratic polynomial whose sum of zeroes is 3 and product of zeroes is If (x + 1) is a factor of x 2 3ax + 3a 7, then find the value of a. 4. How many polynomials are there having zeroes 2 and Write the quadratic polynomial p(y) with 15 and 7 as sum and one of the zeroes respectively. 6. If 1 is a zero of the polynomial p(x) = ax 2 3(a 1)x 1, then find the value of a. 7. If 4 is a zero of the polynomial x 2 x (2 + 2k), then find the value of k. 8. Write the quadratic polynomial having sum and product of zeroes 1 and 2 respectively. 9. If (x + 1) is a factor of x 2 3ax + 3a 7, then find the value of a. 10. Find the degree of the polynomial (x + 1)(x 2 x x 4 + 1). 11. Find a quadratic polynomial, the sum and product of whose zeroes are 0 and 5 respectively. 12. Find the quadratic polynomial, the sum and product of whose zeroes are 4 and 1, respectively 13. Find the quadratic polynomial, the sum and product of whose zeroes are 2 and 3 respectively. 14. Find the remainder when p(x)= x 3-6x 2 +2x-4 is divided by 1-2x. 15. Find the remainder when x is divided by (x+1). 16. Find all the integral zeros of x 3-3x 2-2x On dividing 2x 2 + 3x + 1 by a polynomial g(x), the quotient and the remainder were 2x+1 and 3 respectively. Find g (x). 18. Find the zeroes of 2x 3 11x x Find the quadratic polynomial, the sum and the product of whose zeroes are1/2, and 2 resp. 20. Find the values of m and n for which x = 2 and 3 are zeroes of the polynomial: 3x 2 2mx+ 2n 21. Check whether x is factor of x 4 + 9x Find the polynomial whose sum and product of the zeros are - ½ and ½ respectively. 23. Can y + 1 be the remainder on division of a polynomial p(y) by y - 5? Give reason. 24. If α,β are the zeros of f (x) = px 2 2x + 3p and α + β = α β, then find the value of p. 25. If one zero of the quadratic polynomial p(x) = x 2 + 4kx - 25 is negative of the other, find the value of k. 26. Answer the following questions in one word, one sentence or as per the exact requirement of the question. i) If one zero of the quadratic polynomial x 2 + x 2 is -2, find the other zero. iii) Find the quadratic polynomial whose zeros are -3 and -5. (2 MARKS) 1. Divide the polynomial (x 2 + 1) by (x 1) and verify the division algorithm. 2. If one zero of 2x 2 3x + k is reciprocal to the other, then find the value of k. 3.Find the value of p for which the polynomial x 3 + 4x 2 px + 8 is exactly divisible by (x 2). 4. If 1 is a zero of the polynomial p(x) = ax 2 3(a 1)x 1, then find the value of a.

5 5. If 4 is a zero of the polynomial x 2 x (2 + 2k), then find the value of k. 6.What must be subtracted from the polynomial 8x x 3 +x 2 +7x + 8 so that the resulting polynomial is exactly divisible by 4x 2 3x + 2? 7.If the remainder on division of x 3 +2x 2 + k x +3 by x - 3 is 21. Find the quotient and the value of k. 8.If α and β are the zeros of the polynomial f (x) = x 2 3x + 2, then find the value 1/α +1/β. 9.If a and 1/a are the zeros of polynomial 4x 2-2x +(k-4), then find the value of k. 10.Find the zeros of the polynomial 5y 2-11y +2. (3 Marks) 1. Find a quadratic polynomial each with the given zeros as sum and the product of its zeros respectively (a) ¼, -1 (b) 2, 1/3 2. Using division algorithm, find the quotient and the remainder on dividing f(x) by g(x), where f(x)=6x 3 +13x 2 +2x and g(x)=2x+1 3. If x+1 is a factor of 2x 3 + ax 3 + 2bx + 1, then find the values of a and b given that 2a 3b = If α, β are the zeros of 2y 2 +7y+5 write the value of α+ β +α β. 5. Find the zeros of a quadratic polynomial 5x x and verify the relationship between the zeros and the coefficients of the polynomial. 6. If α, β are the zeros of the poly. f(x)=x 2 -px+q, find the value of (a) α 2 +β 2 (b)1/α +1β 7.Find all the zeros of p(x) = x 3 9x 2 12x + 20 if (x+2) is a factor of p(x). 8.If (x + a) is a factor of two polynomials x 2 +p x +q and x 2 + mx + n then prove that a = n - q / m - p. 9.Find the zeros of 4 3x 2 +5x and verify the relation between the zeros and coefficient of the polynomial. 10.If a and β are the zeros of the quadratic polynomial f (t) = t 2 p(t +1)- c, show that (α+1) (β+1) = 1 c. 11. If the zeros of the quadratic polynomial x 2 + (a+1) x + b are 2 and -3, then find a and b. (4 MARKS) 1. Find all the zeros of 2x 4-9x 3 +5x 2 +3x-1, if two of its zeros are 2+ 3 & If the polynomial 6x 4 + 8x x x + 7 is divided by another polynomial 3x 2 + 4x + 1, the remainder comes out to be (ax + b), find a and b. 3.Find all other zeroes of the polynomial p(x) = 2x 3 + 3x 2 11x 6, if one of its zero is Given that x 5 is a factor of the cubic polynomial x 3 3 5x x 3 5,find all the zeroes of the polynomial 5. Given that 2 is a zero of the cubic polynomial 6x x 2 10x 4 2, find its other two zeroes. 6. Find k so that x 2 + 2x + k is a factor of 2x 4 + x 3 14 x 2 + 5x + 6. Also find all the zeroes of the two polynomials. 7.Obtain all other zeros of the polynomial x 4-3x 3 x 2 + 9x 6, if two of its zeros are 3 and Find the cubic polynomial with the sum,sum of the products of its zeroes taken two at a time, and the products of its zeroes as -3, -8 and 2 respectively.

6 9.Given that 3 is a zero of the polynomial x 3 +x 2-3x 3, find its other two zeroes. 10.If the zeros of the polynomial f(x) = x 3-3x 2-6x + 8 are of the form a -b, a, a + b, find all the zeros. 11. If α and β are the zeros of the polynomial f(x) = 4x 2-5x + 1, find a quadratic polynomial whose zeros are α 2 / β and β 2 /α. III. Pair of Linear Equations in Two Variables (1Mark) 1. Solve x y = 4, x + y = 10 and hence find the value of p when y = 3x p. 3. For which value(s) of k will the pair of equations kx+ 3y = k 3 ; 12x + ky= k have no solution? 4. Find the value of k for which the lines (k+1) x + 3ky + 15 = 0 and 5x +k y + 5 = 0 are coincident. 5. What types of lines do the pair of eqn. x = a and y = b represent graphically. 6. How many solutions does the pair of equations x + 2y = 3 and ½ x + y -3/2 = 0 have? 7. Find the value of k for which the system of equations 2x + y -3 =0 and 5x + k y + 7 = 0 has no solution. 8. Find the value of k for which the system of equations 2x + 3y = 7 and 8x + (k+4)y 28 = 0 has infinitely many solution. 9. Give linear equations which is coincident with 2 x + 3y - 4 = What is the value of a for which (3, a) lies on 2x 3y = The sum of two natural nos. is 25 and their difference is 7. Find the nos. (2Marks) 1. For which values of p and q, will the following pair of linear equations have infinitely many Solutions?4x + 5y = 2 ; (2p + 7q) x + (p + 8q) y = 2q p Solve the following pair of linear equations: 21x + 47y = 110; 47x + 21y = The angles of a cyclic quadrilateral ABCD are A = (6x + 10), B = (5x) C = (x + y), D = (3y 10). Find x and y, and hence the values of the four angles. 4. Check graphically whether the pair of eq. 3x + 2y 4 = 0 and 2x y 2 = 0 is consistent. Also find the coordinates of the points where the graphs of the lines of equations meet the y-axis. 5. The angles of a triangle are x, y and 40. The difference between the two angles x and y is 30. Find x and y. 6. If x = a and y = b is the solution of the equation x-y = 2 and x + y =4 then find the value of a and b. 7. In ABC, A = x 0, B = 3 x 0 and C = y 0. If 3y-5x = 30 prove that the triangle is right angled. 8. If 3x +7y = -1 and 4y-5x+14 =0, find he values of 3x-8y and y/x Is the pair of equations x-y = 5 and 2y-x =10 inconsistent? Justify your answer. 10. If the system of equations 4x- y =3 and (2k-1)x+(k-1)y = 2k +1 is inconsistent, then find k. 11. Solve the pair of linear equations x y = 2 and x + y = 2. Also find p if p = 2x For what value of K the following system of equation are parallel. 2x + Ky= 10, 3x + (k + 3) y = 12

7 (3 Marks) 1. Draw the graphs of the pair of linear equations x y + 2 = 0 and 4x y 4 = 0. Calculate the area of the triangle formed by the lines so drawn and the x-axis. 2. For which value(s) of λ, do the pair of linear equations λx+ y = λ2 and x + λy = 1 have ( i) no solution? (ii) infinitely many solutions? (iii) a unique solution? 3. For which values of a and b, will the following pair of linear equations have infinitely many solutions? x + 2y = 1 (a b)x+ (a + b)y = a + b 2 5. Two years ago, Salim was thrice as old as his daughter and six years later, he will be four years older than twice her age. How old are they now? 6. The age of the father is twice the sum of the ages of his two children. After 20 years, his age will be equal to the sum of the ages of his children. Find the age of the father. 7. Two numbers are in the ratio 5 : 6. If 8 is subtracted from each of the numbers, the ratio becomes 4 : 5.Find the numbers. 8. There are some students in the two examination halls A and B. To make the number of students equal in each hall, 10 students are sent from A to B. But if 20 students are sent from B to A, the number of students in A becomes double the number of students in B. Find the number of students in the two halls. 9. A shopkeeper gives books on rent for reading. She takes a fixed charge for the first two days, and an additional charge for each day thereafter. Latika paid Rs 22 for a book kept for six days, while Anand paid Rs 16 for the book kept for four days. Find the fixed charges and the charge for each extra day. 10. In a competitive examination, one mark is awarded for each correct answer while ½ mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. How many questions did she answer correctly?. 11. Jamila sold a table and a chair for Rs 1050, thereby making a profit of 10% on the table and 25% on the chair. If she had taken a profit of 25% on the table and 10% on the chair she would have got Rs1065. Find the cost price of each.[ 500, 400] 12. It can take 12 hours to fill a swimming pool using two pipes. If the pipe of larger diameter is used for 4hours and the pipe of smaller diameter for 9 hours, only half the pool can be filled.how long would it take for each pipe to fill the pool separately?[ 20, 30] 13. Ankita travels 14 km to her home partly by rickshaw and partly by bus. She takes half an hour if she travels 2 km by rickshaw, and the remaining distance by bus. On the other hand, if she travels 4 km by rickshaw and the remaining distance by bus, she takes 9 minutes longer. Find the speed of the rickshaw and of the bus. 14. A person, rowing at the rate of 5 km/h in still water, takes thrice as much time in going 40 km upstream as in going 40 km downstream. Find the speed of the stream. 15. Find the value of p and q for which the system of equations represent coincident lines 2x +3y = 7, (p+q+1)x +(p+2q+2)y = 4(p+q) The larger of two supplementary angles exceeds the smaller by 180, find them. 17. A chemist has one solution which is 50% acid and a second which is 25% acid. How much of each should be mixed to make 10 litres of 40% acid solution. 18. When 6 boys were admitted & 6 girls left the percentage of boys increased from 60% to 75%. Find the original no. of boys and girls in the class. 19. Solve the following equations by the method of cross multiplication: mx - ny = m 2 + n 2 and x + y = 2m 19.Half the perimeter of a rectangular garden, whose length is 4m more than its width is 36m.Find the dimensions of the garden. 20.If x+1 is a factor of 2x 3 +ax 2 + 2bx +1, then find the values of a and b given that 2a -3b = 4.

8 21.The age of the father is twice the sum of the ages of his two children. After 20 years, his age will be equa to the sum of the ages of his children. Find the age of the father. 22. The larger of two supplementary angles exceeds thrice the smaller by 20 degrees. Find them. 23. Check graphically whether the pair of linear equations 3x + 5y = 15, x y = 5 is consistent. Also check whether the pair is dependent. (4 Marks) 1. For which value(s) of k will the pair of equations kx+ 3y = k 3 ; 12x + ky= k have no solution? 2. Two rails are represented by the equations x + 2y 4 = 0 and 2x + 4y 12 = 0. Represent this situation geometrically. 3. Solve for p and q: [p+q ] / pq =2 and [p-q ] / pq =6 4. Solve for x and y : 6 /[x+y] = 7/ [x-y] + 3 ; 1/ 2[x+y] = 1/ 3[x-y] 5. Form a pair of linear equations for : The sum of the numerator and denominator of fraction is 3 less than twice the denominator. If the numerator and denominator both are decreased by 1, the numerator becomes half the denominator. 6. Amar gives Rs to some athletes of a school as scholarship every month. Had there been 20 ore athletes each would have got Rs. 160 less. Form a pair of linear equations for this. 7. Dinesh in walking along the line joining (1, 4) and (0, 6), Naresh is walking along the line joining (3, 4,) and (1,0). Represent on graph and find the point where both of them cross each other. 8. Form a pair of linear equations for the following situation assuming speed of boat in still water as x and speed of stream y : A boat covers 32 km upstream and 36 km downstream in 7 hours. It also covers 40 km upstream and 48 km downstream in 9 hours. 9.A person, rowing at the rate of 5km/h in still water, takes thrice as much time in going 40 km upstream as in going 40km downstream. Find the speed of the stream. 10.Solve graphically the system of linear equations: 4x 3y + 4 = 0 4x + 3y 20 = 0 Find the area bounded by these lines and x-axis. 11.The sum of a two digit number and the number obtained by reversing the order of its digits is 165. If the digits differ by 3,find the number. 12.Two women and 5 men can together finish a piece of embroidery in 4 days,while 3 women and 6 men can finish it in 3 days. Find the time taken by 1 woman alone, and that taken by 1 man alone to finish the embroidery. 13.Determine graphically, the vertices of the triangle formed by the lines y =x, 3y = x, x+ y = 8. VI.Triangles (2 marks) 1. L and M are respectively the points on the sides DE and DF of a triangle DEF such that DL = 4, LE = 4/3, DM = 6 and DF = 8. Is LM\\EF? Give reason.

9 2. A vertical stick 20m long casts a shadow 10m long on the ground. At the same time, a tower casts a shadow 50m long on the ground. Find the height of the tower. 3. If ABC and DEF are similar triangles such at A = 45 0 and F = 56 0, then find C. 4. If ABC ~ ZYX, then name the angles equal to B and Z respectively. 5. In ABC, AB = 24cm, BC = 10cm and AC = 26cm. Is this triangle right triangle? (3 marks) 1. The lengths of the diagonals of a rhombus are 24cm and 32cm. Find the length of the side of the rhombus. 2. XY is drawn parallel to the base BC of a ABC cutting AB at X and AC at Y. If AB = 4BX and YC = 2cm, then find AY. 3. PQR is an isosceles triangle with QP = QR. If PR 2 = 2QR 2, prove that PQR is right- triangle. 4. ABC ~ DEF. If AB = 4cm, BC =3.5cm, CA = 2.5cm and DF =7.5cm, then find perimeter of DEF. 5. The lengths of the diagonals of a rhombus are 30cm and 40cm. Find the side of the rhombus. 6. In ABC, DE\\BC. If AD = 2.4cm, AE =3.2cm, DE = 2cm and BC = 5cm, find BD and CE. 7. In ABC, DE\\BC. If AD=4x-3, AE = 8x-7, BD = 3x -1 and CE = 5x -3, find the value of x. 8. If a line intersects sides AB and AC of a ABC at D and E respectively and is parallel to BC, prove that AD/AB = AE/AC. 9. O is any point inside a rectangle ABCD, Prove that OB 2 + OD 2 = OA 2 +OC D, E and F are respectively the mid points of sides AB, BC and CA of ABC. Find the ratio of the areas of DEF and ABC. (4 marks) 1. ABC is a right triangle right-angled at C. Let BC = a, CA = b, AB = c and let p be the length of perpendicular from C on AB. Prove that: i) cp = ab (ii) 1/p 2 = 1/a 2 + 1/b State and prove basic proportionality theorem. 3. In an equilateral triangle with side a, prove that: i) Altitude = 3/2 a ii) Area = 3/4 a D and E are points on the sides AB and AC respectively of a ABC such that DE\\BC and divides ABC into two parts, equal in area. Find BD/AB. 5. In PQR, PD QR such that D lies on QR. If PQ = a, PR = b, QD = c and DR =d, prove that: (a+b)(a-b) = (c+d)(c-d). 6. Prove that ratio of areas of two similar triangles is square of the ratio of their corresponding sides. 7. Prove that ratio of areas of two similar triangles is square of the ratio of their corresponding medians. 8. State and prove Pythagoras theorem. 9. Prove that radius of a circle is perpendicular to the tangent at point of contact.

10 VIII Introduction to trigonometry ( 1 mark) 1. If sin θ = 3/5, find the values of other trigonometric identities. 2. Prove that : cot θ tan θ = 2cos 2 θ -1/sin θ. cos θ. 3.Verify ; (1 cos 2 θ ) cosec θ = Show that : tan 2 θ cos 2 θ = 1- cos 2 θ. 5. Find : 2 tan 30 0 / 1+ tan If tana =4/3 find sina 7. What is the maximum value of 1/secA 8. Write the value of acute angle Ѳ where 3 sinѳ = cosѳ 9.The value tan1 0 tan2 0 tan3 0 tan Find the value of ( 1 sin 2 A) sec 2 A (2 marks) 1. In ABC, right angled at C, find cos A, tan A and cosec B, if sin A = 24/ Evaluate cos 48 0 cos 42 0 sin 48 0 sin If sin θ = cos θ then find the value of 2 tan θ + cos 2 θ. 4. Given that sin θ = a/b then find the value of tan θ. 5. If sin θ = 1/2, 0 < θ < 90, find the value of cos θ and tan θ. 6. A and B are acute angle such that cosa = cosb. Show that A = B 7.If A = 30 0 Verify that cos3a = 4cos 3 A 3cosA 8.Express cos cot75 0 in term of angle between 0 0 to Evalute 10. If sin5a = cos4a and where 5A and 4A are acute angles find the value of A. (3 marks) 1. Find an acute angle θ when cos θ - sin θ / cos θ + sin θ = 1-3 / evaluate : 3 cos 68 0 X cosec 22 0 ½ tan 43 0 X tan 47 0 X tan 12 0 X tan 60 0 X tan Prove that 1+ cot 2 θ/ 1+ cosec θ= cosec θ. 4. If tan ( A+B ) = 3 and tan (A - B ) = 1/ 3 ; find A and B. 5. Evaluate : sin 25 0 cos cos 25 0 sin If A, B,C are interior angles of a triangle ABC prove that sin( ) = cos. 7.Prove that + 8. Prove that 9. If cosa+sina = 10. If x Ѳ + y = sin Ѳ. cos Ѳ and x sinѳ = y cos Ѳ, prove that.

11 (4 marks) 1. Prove that. 2. prove that 3. Prove that 4. if sec θ= x + 1/4x prove that sec θ+ tan θ = 2x or 1/2x. 5. Prove that (1/ cosec x +cot x) 1/sin x = 1/ sin x 1/ (cosec x cot x). 6. Prove that tan θ/ 1- cot θ + cot θ / 1- tan θ = 1+ sec θ cosec θ = 1+ tan θ + cot θ 7. If tan θ +sin θ = m and tanθ - sin θ= n show that m n = 4 mn. XIV STATISTICS 1. Which graphical representation helps in determining the mode of frequency distribution. 2. Write the formula of mode in symbol notation. 3. Consider the following frequency table Class , Frequency Determine the modal class. 4. What is the empirical relation between mean, median and mode. 5. Which measure of central tendency is given by the x coordinate of the point of intersection of the more than ogive and less than ogive. 6. For the following distribution find the modal class Mark below 10 below 20 below 30 below 40 below 50 below 60 No. of students If the mean of the following distribution is 2.6 then find the value of k Xi Fi k If the mean of the following data is find the value of p. Xi p Fi Find the mean age of 100 residents of a town from the following data Age in yrs. above 0 above 10 above 20 above 30 above 40 above 50 above 60 above 70 No. of persons Height in cm No. of students What is the sum of the lower limit of the modal class and upper limit of the median class. 11. For the following distribution calculate mean Class Frequency

12 12. The length of 40 leaves of a plant are measured correctly to the nearest mm and the data obtained is represented in the following table.find median length of leaves. Length(mm) No, of leaves Find the mean of following distribution: X F The following data gives the weight of 30 students of a class.find the median weight of the students. Weight (kg) Total students No of students Draw a less than type and a more than type ogive from the given data, get the median mark from the graph. Marks No. of students Daily income of 50 workers of a factory are given below. Daily income(rs.) No. of workers Find the median income of the workers. 17. The following table gives the production yield per hectare of wheat of 100 farms of a village. Production in kg No. of farms Change the above into more than type table. 18. Calculate the value of mode for the following frequency distribution Class Frequency Find the mode of the following data- I 3,5,7,4,5,3,5,6,8,9,5,3,5,6,9,7,4 II 3,3,7,4,5,3,5,6,8,9,5,3,5,3,6,9,7 III 15,8,26,25,24,15,18,20,24,15,19,15