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CDS (II) 2020, Elementary Mathematics question paper

100 questions · 100 marks · 120 minutes · +1 per correct answer, -0.33 per wrong one

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  1. 1
    x3+x2+16x^3 + x^2 + 16 is exactly divisible by xx, where xx is a positive integer. The number of all such possible values of xx is

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  2. 2
    The number of (a,b,c)(a, b, c), where aa, bb, cc are positive integers such that abc=30abc = 30, is

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  3. 3
    If the roots of the quadratic equation x2−4x−log⁡10N=0x^2 - 4x - \log_{10} N = 0 are real, then what is the minimum value of NN ?

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  4. 4
    The number of different solutions of the equation x+y+z=12x + y + z = 12, where each of xx, yy and zz is a positive integer, is

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  5. 5
    If I=a2+b2+c2I = a^2 + b^2 + c^2, where aa and bb are consecutive integers and c=abc = ab, then II is

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  6. 6
    If the number 23P62971335 is divisible by the smallest odd composite number, then what is the value of P ?

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  7. 7
    What is the remainder when the sum 15+25+35+45+551^5 + 2^5 + 3^5 + 4^5 + 5^5 is divided by 4 ?

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  8. 8
    What is the digit in the unit place of 3993^{99} ?

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  9. 9
    LCM of two numbers is 28 times their HCF. The sum of the HCF and the LCM is 1740. If one of these numbers is 240, then what is the other number ?

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  10. 10
    (xn−an)(x^n - a^n) is divisible by (x−a)(x - a), where x≠ax \ne a, for every

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  11. 11
    If 17202017^{2020} is divided by 18, then what is the remainder ?

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  12. 12
    What is the value of 11+2+12+3+13+4+…+199+100\frac{1}{1+\sqrt{2}} + \frac{1}{\sqrt{2}+\sqrt{3}} + \frac{1}{\sqrt{3}+\sqrt{4}} + \ldots + \frac{1}{\sqrt{99}+\sqrt{100}} ?

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  13. 13
    If xm=xxx14x^m = \sqrt[14]{x\sqrt{x\sqrt{x}}}, then what is the value of mm ?

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  14. 14
    The sum of all possible products taken two at a time out of the numbers ±1,±2,±3,±4,±5\pm 1, \pm 2, \pm 3, \pm 4, \pm 5 is

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  15. 15
    A train of length 110 m is moving at a uniform speed of 132 km/hr. The time required to cross a bridge of length 165 m is

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  16. 16
    The simple interest on a certain sum is one-fourth of the sum. If the number of years and the rate of annual interest are numerically equal, then the number of years is

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  17. 17
    A 60-page book has nn lines per page. If the number of lines were reduced by 3 in each page, the number of pages would have to be increased by 10 to give the same writing space. What is the value of nn ?

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  18. 18
    If xx men working xx hours per day can do xx units of work in xx days, then yy men working yy hours per day in yy days would be able to do kk units of work. What is the value of kk ?

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  19. 19
    Let d(n)d(n) denote the number of positive divisors of a positive integer nn. Which of the following are correct ? 1. d(5)=d(11)d(5) = d(11) 2. d(5)⋅d(11)=d(55)d(5) \cdot d(11) = d(55) 3. d(5)+d(11)=d(16)d(5) + d(11) = d(16) Select the correct answer using the code given below :

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  20. 20
    If An=Pn+1A_n = P_n + 1, where PnP_n is the product of the first nn prime numbers, then consider the following statements : 1. AnA_n is always a composite number. 2. An+2A_n + 2 is always an odd number. 3. An+1A_n + 1 is always an even number. Which of the above statements is/are correct ?

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  21. 21
    A shopkeeper sells his articles at their cost price but uses a faulty balance which reads 1000 gm for 800 gm. What is the actual profit percentage ?

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  22. 22
    A river 3 m deep and 40 m wide is flowing at the rate of 2 km/hr and falls into the sea. What is the amount of water in litres that will fall into the sea from this river in a minute ?

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  23. 23
    If a television set is sold at Rs. xx, a loss of 28% would be incurred. If it is sold at Rs. yy, a profit of 12% would be incurred. What is the ratio of yy to xx ?

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  24. 24
    By increasing the speed of his car by 15 km/hr, a person covers a distance of 300 km by taking an hour less than before. What was the original speed of the car ?

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  25. 25
    Three persons start a business with capitals in the ratio 13:14:15\frac{1}{3} : \frac{1}{4} : \frac{1}{5}. The first person withdraws half his capital after 4 months. What is his share of profit if the business fetches an annual profit of Rs. 96,800 ?

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  26. 26
    If xx varies as yy, then which of the following is/are correct ? 1. x2+y2x^2 + y^2 varies as x2−y2x^2 - y^2 2. xy2\frac{x}{y^2} varies inversely as yy 3. x2yn\sqrt[n]{x^2 y} varies as x4y22n\sqrt[2n]{x^4 y^2} Select the correct answer using the code given below :

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  27. 27
    Ena was born 4 years after her parents marriage. Her mother is 3 years younger than her father and 24 years older than Ena, who is 13 years old. At what age did Ena's father get married ?

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  28. 28
    Mahesh is 60 years old. Ram is 5 years younger to Mahesh and 4 years elder to Raju. Babu is a younger brother of Raju and he is 6 years younger. What is the age difference between Mahesh and Babu ?

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  29. 29
    The number of items in a booklet is NN. In the first year there is an increase of xx% in this number and in the subsequent year there is a decrease of xx%. At the end of the two years, what will be the number of items in the booklet ?

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  30. 30
    If ab+xy−xb=0ab + xy - xb = 0 and bc+yz−cy=0bc + yz - cy = 0, then what is xa+cz\frac{x}{a} + \frac{c}{z} equal to ?

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  31. 31
    What is the HCF of the polynomials x6−3x4+3x2−1x^6 - 3x^4 + 3x^2 - 1 and x3+3x2+3x+1x^3 + 3x^2 + 3x + 1 ?

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  32. 32
    The HCF and the LCM of two polynomials are 3x+13x + 1 and 30x3+7x2−10x−330x^3 + 7x^2 - 10x - 3 respectively. If one polynomial is 6x2+5x+16x^2 + 5x + 1, then what is the other polynomial ?

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  33. 33
    If (p+2)(2q−1)=2pq−10(p + 2)(2q - 1) = 2pq - 10 and (p−2)(2q−1)=2pq−10(p - 2)(2q - 1) = 2pq - 10, then what is pqpq equal to ?

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  34. 34
    What is the value of a2+aca2c−c3−a2−c2a2c+2ac2+c3−2ca2−c2+3a+c\dfrac{a^2 + ac}{a^2c - c^3} - \dfrac{a^2 - c^2}{a^2c + 2ac^2 + c^3} - \dfrac{2c}{a^2 - c^2} + \dfrac{3}{a + c} ?

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  35. 35
    What is the square root of 4x4+8x3−4x+14x^4 + 8x^3 - 4x + 1 ?

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  36. 36
    The sum of the digits of a two digit number is 13 and the difference between the number and that formed by reversing the digits is 27. What is the product of the digits of the number ?

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  37. 37
    If xb+c=yc+a=zb−a\dfrac{x}{b + c} = \dfrac{y}{c + a} = \dfrac{z}{b - a}, then which one of the following is correct ?

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  38. 38
    X, Y and Z travel from the same place with uniform speeds 4 km/hr, 5 km/hr and 6 km/hr respectively. Y starts 2 hours after X. How long after Y must Z start in order that they overtake X at the same instant ?

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  39. 39
    1−x−xn+xn+11 - x - x^n + x^{n+1}, where n is a natural number, is divisible by

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  40. 40
    A person sold an article for Rs. 75 which cost him Rs. x. He finds that he realised x% profit on his outlay. What is x equal to ?

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  41. 41
    A car did a journey in t hours. Had the average speed been x kmph greater, the journey would have taken y hours less. How long was the journey ?

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  42. 42
    When a ball is allowed to fall, the time it takes to fall any distance varies as the square root of the distance and it takes 4 seconds to fall 78.40 m. How long would it take to fall 122.50 m ?

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  43. 43
    If 63−4x 4x+5=86^{3 - 4x}\, 4^{x + 5} = 8 (Given log⁡102=0.301\log_{10} 2 = 0.301 and log⁡103=0.477\log_{10} 3 = 0.477), then which one of the following is correct ?

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  44. 44
    The Euclidean algorithm is used to calculate the

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  45. 45
    If radius of a sphere is rational, then which of the following is/are correct ? 1. Its surface area is rational. 2. Its volume is rational. Select the correct answer using the code given below :

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  46. 46
    If cosec⁡θ−sin⁡θ=m\operatorname{cosec}\theta - \sin\theta = m and sec⁡θ−cos⁡θ=n\sec\theta - \cos\theta = n, then what is m43n23+m23n43m^{\frac{4}{3}} n^{\frac{2}{3}} + m^{\frac{2}{3}} n^{\frac{4}{3}} equal to ?

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  47. 47
    If cos⁡θ+sec⁡θ=k\cos\theta + \sec\theta = k, then what is the value of sin⁡2θ−tan⁡2θ\sin^2\theta - \tan^2\theta ?

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  48. 48
    ABC is a triangle inscribed in a semicircle of diameter AB. What is cos⁡(A+B)+sin⁡(A+B)\cos(A + B) + \sin(A + B) equal to ?

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  49. 49
    Consider the following statements : 1. sin⁡θ=x+1x\sin\theta = x + \dfrac{1}{x} is possible for some real value of x. 2. cos⁡θ=x+1x\cos\theta = x + \dfrac{1}{x} is possible for some real value of x. Which of the above statements is/are correct ?

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  50. 50
    What is the magnitude (in radian) of the interior angle of a regular pentagon ?

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  51. 51
    The difference between two angles is 15∘15^\circ and the sum of the angles in radian is 5π12\dfrac{5\pi}{12}. The bigger angle is k times the smaller angle. What is k equal to ?

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  52. 52
    Consider the following statements : 1. The equation 2sin⁡2θ−cos⁡θ+4=02\sin^2\theta - \cos\theta + 4 = 0 is possible for all θ\theta. 2. tan⁡θ+cot⁡θ\tan\theta + \cot\theta cannot be less than 2, where 0<θ<π20 < \theta < \dfrac{\pi}{2}. Which of the above statements is/are correct ?

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  53. 53
    A road curve is to be laid out on a circle. What radius should be used if the track is to change direction by 42∘42^\circ in distance of 44 m ? (Assume π=227\pi = \dfrac{22}{7})

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  54. 54
    What is the maximum value of 3sin⁡θ−43 \sin \theta - 4 ?

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  55. 55
    If sin⁡θ+cos⁡θ=2\sin \theta + \cos \theta = \sqrt{2}, then what is sin⁡6θ+cos⁡6θ+6sin⁡2θcos⁡2θ\sin^6 \theta + \cos^6 \theta + 6 \sin^2 \theta \cos^2 \theta equal to ?

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  56. 56
    What is the least value of 9sin⁡2θ+16cos⁡2θ9 \sin^2 \theta + 16 \cos^2 \theta ?

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  57. 57
    If cos⁡47∘+sin⁡47∘=k\cos 47^\circ + \sin 47^\circ = k, then what is the value of cos⁡247∘−sin⁡247∘\cos^2 47^\circ - \sin^2 47^\circ ?

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  58. 58
    If cosec⁡θ−sin⁡θ=p3\operatorname{cosec} \theta - \sin \theta = p^3 and sec⁡θ−cos⁡θ=q3\sec \theta - \cos \theta = q^3, then what is the value of tan⁡θ\tan \theta ?

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  59. 59
    If 0≤α,β≤90∘0 \le \alpha, \beta \le 90^\circ such that cos⁡(α−β)=1\cos (\alpha - \beta) = 1, then what is sin⁡α−sin⁡β+cos⁡α−cos⁡β\sin \alpha - \sin \beta + \cos \alpha - \cos \beta equal to ?

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  60. 60
    Consider the following statements : 1. The value of cos⁡61∘+sin⁡29∘\cos 61^\circ + \sin 29^\circ cannot exceed 1. 2. The value of tan⁡23∘−cot⁡67∘\tan 23^\circ - \cot 67^\circ is less than 0. Which of the above statements is/are correct ?

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  61. 61
    In a quadrilateral ABCD, ∠B=90∘\angle B = 90^\circ and AB2+BC2+CD2−AD2=0AB^2 + BC^2 + CD^2 - AD^2 = 0, then what is ∠ACD\angle ACD equal to ?

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  62. 62
    In a △ABC\triangle ABC, AC = 12 cm, AB = 16 cm and AD is the bisector of ∠A\angle A. If BD = 4 cm, then what is DC equal to ?

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  63. 63
    ABCD is a cyclic quadrilateral. The bisectors of the angles A, B, C and D cut the circle at P, Q, R and S respectively. What is ∠PQR+∠RSP\angle PQR + \angle RSP equal to ?

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  64. 64
    ABC is an equilateral triangle. The side BC is trisected at D such that BC = 3 BD. What is the ratio of AD2AD^2 to AB2AB^2 ?

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  65. 65
    Consider the following statements : 1. The diagonals of a trapezium divide each other proportionally. 2. Any line drawn parallel to the parallel sides of a trapezium divides the non-parallel sides proportionally. Which of the above statements is/are correct ?

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  66. 66
    If H, C and V are respectively the height, curved surface area and volume of a cone, then what is 3πVH3+9V23 \pi V H^3 + 9 V^2 equal to ?

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  67. 67
    How many solid lead balls each of diameter 2 mm can be made from a solid lead ball of radius 8 cm ?

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  68. 68
    The two sides of a triangle are 40 cm and 41 cm. If the perimeter of the triangle is 90 cm, what is its area ?

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  69. 69
    The diagonals of a rhombus differ by 2 units and its perimeter exceeds the sum of the diagonals by 6 units. What is the area of the rhombus ?

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  70. 70
    What is the area of a right-angled triangle, if the radius of the circumcircle is 5 cm and altitude drawn to the hypotenuse is 4 cm ?

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  71. 71
    In a triangle, values of all the angles are integers (in degree measure). Which one of the following cannot be the proportion of their measures ?

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  72. 72
    The length of a rectangle is increased by 10% and breadth is decreased by 10%. Then the area of the new rectangle is

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  73. 73
    The surface areas of two spheres are in the ratio 1:41 : 4. What is the ratio of their volumes ?

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  74. 74
    The length, breadth and height of a brick are 20 cm, 15 cm and 10 cm respectively. The number of bricks required to construct a wall with dimensions 45 m length, 0.15 m breadth and 3 m height is

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  75. 75
    If the sum of all interior angles of a regular polygon is twice the sum of all its exterior angles, then the polygon is

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  76. 76
    A bicycle wheel makes 5000 revolutions in moving 11 km. What is the radius of the wheel ? (Assume π=227\pi = \frac{22}{7})

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  77. 77
    The volumes of two cones are in the ratio 1 : 4 and their diameters are in the ratio 4 : 5. What is the ratio of their heights ?

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  78. 78
    In a triangle ABC, if 2∠A=3∠B=6∠C2 \angle A = 3 \angle B = 6 \angle C, then what is ∠A+∠C\angle A + \angle C equal to ?

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  79. 79
    If the perimeter of a circle and a square are equal, then what is the ratio of the area of the circle to that of the square ?

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  80. 80
    The lengths of the sides of a right-angled triangle are consecutive even integers (in cm). What is the product of these integers ?

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  81. 81
    A circle is inscribed in a triangle ABC. It touches the sides AB and AC at M and N respectively. If O is the centre of the circle and ∠A=70∘\angle A = 70^\circ, then what is ∠MON\angle MON equal to ?

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  82. 82
    The sum of the squares of sides of a right-angled triangle is 8,450 square units. What is the length of its hypotenuse ?

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  83. 83
    A triangle and a parallelogram have equal areas and equal bases. If the altitude of the triangle is k times the altitude of the parallelogram, then what is the value of k ?

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  84. 84
    Areas of two squares are in the ratio m2:n4m^2 : n^4. What is the ratio of their perimeters ?

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  85. 85
    AD is the median of the triangle ABC. If P is any point on AD, then which one of the following is correct ?

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  86. 86
    What is the area of a segment of a circle of radius r subtending an angle θ\theta at the centre ?

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  87. 87
    ABC is a triangle right-angled at C. Let P be any point on AC and Q be any point on BC. Which of the following statements is/are correct ? 1. AQ2+BP2=AB2+PQ2AQ^2 + BP^2 = AB^2 + PQ^2 2. AB=2PQAB = 2PQ Select the correct answer using the code given below :

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  88. 88
    Four circular coins of equal radius are placed with their centres coinciding with four vertices of a square. Each coin touches two other coins. If the uncovered area of the square is 42 cm242 \text{ cm}^2, then what is the radius of each coin ? (Assume π=227\pi = \frac{22}{7})

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  89. 89
    The radii of the flat circular faces of a bucket are x and 2x. If the height of the bucket is 3x, what is the capacity of the bucket ? (Assume π=227\pi = \frac{22}{7})

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  90. 90
    If p, q, r, s and t represent length, breadth, height, surface area and volume of a cuboid respectively, then what is 1p+1q+1r\frac{1}{p} + \frac{1}{q} + \frac{1}{r} equal to ?

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  91. 91
    Fifteen candidates appeared in an examination. The marks of the candidates who passed in the examination are 9, 6, 7, 8, 8, 9, 6, 5, 4 and 7. What is the median of marks of all the fifteen candidates ?

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  92. 92
    If the yield (in gm) of barley from 7 plots of size one square yard each, were found to be 180, 191, 175, 111, 154, 141 and 176, then what is the median yield ?

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  93. 93
    Which one of the following measures of central tendency will be used to determine the average size of the shoe sold in the shop ?

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  94. 94
    When the class intervals have equal width, the height of a rectangle in a histogram represents

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  95. 95
    The ages of 7 family members are 2, 5, 12, 18, 38, 40 and 60 years respectively. After 5 years a new member aged xx years is added. If the mean age of the family now goes up by 1.5 years, then what is the value of xx ?

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  96. 96
    The mean weight of 100 students in a class is 46 kg. The mean weight of boys is 50 kg and that of girls is 40 kg. The number of boys exceeds the number of girls by

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  97. 97
    What is the algebraic sum of the deviations from the mean of a set of values 25, 65, 73, 75, 83, 76, 17, 15, 7, 14 ?

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  98. 98
    The mean of five observations xx, x+2x + 2, x+4x + 4, x+6x + 6, x+8x + 8 is mm. What is the mean of the first three observations ?

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  99. 99
    What is the median of 2, 4, 6, ..., 100 ?

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  100. 100
    The harmonic mean and the geometric mean of two numbers are 10 and 12 respectively. What is their arithmetic mean ?

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