CDS (II) 2019, Elementary Mathematics question paper

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

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1 $(17^{29} + 19^{29})$
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2 $n$
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3 $How many pairs (A, B) are possible in the number 479865AB if the number is divisible by 9 and it is given that the last digit of the number is odd ?$
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4 $999 \times abc = def132$
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5 $x$
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6 $Priya's age was cube of an integral number (different from 1) four years ago and square of an integral number after four years. How long should she wait so that her age becomes square of a number in the previous year and cube of a number in the next year ?$
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7 $Which of the following statements is not true ?$
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8 $x > 0$
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9 $\frac{1 + px}{1 - px}\sqrt{\frac{1 - qx}{1 + qx}} = 1$
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10 $In a hostel the rent per room is increased by 20%. If number of rooms in the hostel is also increased by 20% and the hostel is always full, then what is the percentage change in the total collection at the cash counter ?$
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11 $Radha and Hema are neighbours and study in the same school. Both of them use bicycles to go to the school. Radha's speed is 8 km/hr whereas Hema's speed is 10 km/hr. Hema takes 9 minutes less than Radha to reach the school. How far is the school from the locality of Radha and Hema ?$
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12 $3^{x + 2} + 3^{-x} = 10$
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13 $\log_{10} 2 = 0.301$
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14 $The sum of three prime numbers is 100. If one of them exceeds another by 36, then one of the numbers is$
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15 $\cfrac{1}{a + \cfrac{1}{b + \cfrac{1}{c + \cfrac{1}{2}}}} = \frac{16}{23}$
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Consider the following for the next three (03) items : In a certain town of population size 1,00,000 three types of newspapers (I, II and III) are available. The percentages of the people in the town who read these papers are as follows :
Newspaper Proportion of readers
I 10%
II 30%
III 5%
Both I and II 8%
Both II and III 4%
Both I and III 2%
All the three (I, II and III) 1%
16 $What is the number of people who read only one newspaper ?$
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17 $What is the number of people who read at least two newspapers ?$
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18 $What is the number of people who do not read any of these three newspapers ?$
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19 $7^{73}$
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20 $(n^2 + 48)$
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21 $x = \frac{4\sqrt{6}}{\sqrt{2} + \sqrt{3}}$
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22 $x, y and z are three numbers such that x is 30% of z and y is 40% of z. If x is p% of y, then what is the value of p ?$
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23 $(t + 30)$
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24 $> 1$
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25 $In a class of 100 students, the average weight is 30 kg. If the average weight of the girls is 24 kg and that of the boys is 32 kg, then what is the number of girls in the class ?$
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26 $\sqrt{(a - b)^2} + \sqrt{(b - a)^2}$
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27 $a : b = c : d = 1 : 6$
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28 $0.\overline{53} + 0.5\overline{3}$
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29 $3^N > N^3$
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30 $Which one of the following is an irrational number ?$
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31 $A race has three parts. The speed and time required to complete the individual parts for a runner is displayed on the following chart : Part I Part II Part III Speed (kmph) 98 7.5 Time (minutes) 5080100 What is the average speed of this runner ?$
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32 $\frac{a}{b + c} = \frac{b}{c + a} = \frac{c}{a + b}$
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33 $3^{521}$
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34 $A prime number contains the digit X at unit's place. How many such digits of X are possible ?$
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35 $If an article is sold at a gain of 6% instead of a loss of 6%, the seller gets Rs. 6 more. What is the cost price of the article ?$
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36 $A field can be reaped by 12 men or 18 women in 14 days. In how many days can 8 men and 16 women reap it ?$
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37 $3^x = 4^y = 12^z$
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38 $(4a + 7b)(4c - 7d) = (4a - 7b)(4c + 7d)$
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39 $(x^2 + ax + b)$
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40 $Tushar takes 6 hours to complete a piece of work, while Amar completes the same work in 10 hours. If both of them work together, then what is the time required to complete the work ?$
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41 $2 + \sqrt{2 + \sqrt{2 + \sqrt{\ldots\ldots\ldots}}}$
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42 $In an examination, 52% candidates failed in English and 42% failed in Mathematics. If 17% failed in both the subjects, then what percent passed in both the subjects ?$
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43 $A man who recently died left a sum of Rs. 3,90,000 to be divided among his wife, five sons and four daughters. He directed that each son should receive 3 times as much as each daughter receives and that each daughter should receive twice as much as their mother receives. What was the wife's share ?$
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44 $What is the least number of complete years in which a sum of money put out at 40% annual compound interest will be more than trebled ?$
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45 $A person divided a sum of Rs. 17,200 into three parts and invested at 5%, 6% and 9% per annum simple interest. At the end of two years, he got the same interest on each part of money. What is the money invested at 9% ?$
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46 $\frac{(x - y)^3 + (y - z)^3 + (z - x)^3}{3(x - y)(y - z)(z - x)}$
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47 $a^x = b^y = c^z$
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48 $x^2 - 15x + r = 0$
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49 $x^2 - 7x + 12 > 0$
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50 $5^{2n} - 2^{3n}$
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51 $\tan x = 1$
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52 $\sin 46^\circ \cos 44^\circ + \cos 46^\circ \sin 44^\circ$
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53 $0 < \theta < 90^\circ$
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54 $30^\circ$
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55 $\tan 1^\circ \tan 2^\circ \tan 3^\circ \ldots\ldots\ldots \tan 89^\circ$
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56 $150^\circ$
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57 $3 \tan \theta = \cot \theta$
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58 $\sin^2 25^\circ + \sin^2 65^\circ$
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59 $\sin^6 \theta + \cos^6 \theta + 3 \sin^2 \theta \cos^2 \theta - 1$
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60 $\alpha, \beta, \gamma$
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61 $Consider the following grouped frequency distribution : x f 0 - 10 8 10 - 20 12 20 - 30 10 30 - 40 p 40 - 50 9 If the mean of the above data is 25.2, then what is the value of p ?$
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62 $Consider the following frequency distribution : x f 865465108994674 What is the median for the distribution ?$
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63 $The average of 50 consecutive natural numbers is x. What will be the new average when the next four natural numbers are also included ?$
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64 $Consider two-digit numbers which remain the same when the digits interchange their positions. What is the average of such two-digit numbers ?$
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65 $Diagrammatic representation of data includes which of the following ? 1. Bar diagram 2. Pie-diagram 3. Pictogram Select the correct answer using the code given below :$
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66 $The data collected from which one of the following methods is not a primary data ?$
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67 $The monthly expenditure of a person is Rs. 6,000. The distribution of expenditure on various items is as follows : Item of expenditure Amount (in Rs.) 1. Food 2,000 2. Clothing 660 3. Fuel and rent 1,200 4. Education 480 5. Miscellaneous 1,660 If the above data is represented by a percentage bar diagram of height 15 cm, then what are the lengths of the two segments of the bar diagram corresponding to education and miscellaneous respectively ?$
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68 $If the mean of m observations out of n observations is n and the mean of remaining observations is m, then what is the mean of all n observations ?$
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69 $Which one of the following pairs is correctly matched ?$
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70 $The following pairs relate to frequency distribution of a discrete variable and its frequency polygon. Which one of the following pairs is not correctly matched ?$
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71 $In a rectangle, length is three times its breadth. If the length and the breadth of the rectangle are increased by 30% and 10% respectively, then its perimeter increases by$
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72 $What is the percentage decrease in the area of a triangle if its each side is halved ?$
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73 $The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area ?$
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74 $If the lengths of two parallel chords in a circle of radius 10 cm are 12 cm and 16 cm, then what is the distance between these two chords ?$
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75 $Considering two opposite vertices of a square of side 'a' as centres, two circular arcs are drawn within the square joining the other two vertices, thus forming two sectors. What is the common area in these two sectors ?$
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76 $The corners of a square of side 'a' are cut away so as to form a regular octagon. What is the side of the octagon ?$
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77 $Three consecutive integers form the lengths of a right-angled triangle. How many sets of such three consecutive integers is/are possible ?$
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78 $Two circles are drawn with the same centre. The circumference of the smaller circle is 44 cm and that of the bigger circle is double the smaller one. What is the area between these two circles ?$
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79 $\times$
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80 $The perimeter of a right-angled triangle is k times the shortest side. If the ratio of the other side to hypotenuse is 4 : 5, then what is the value of k ?$
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81 $A 12 m long wire is cut into two pieces, one of which is bent into a circle and the other into a square enclosing the circle. What is the radius of the circle ?$
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82 $The angles of a triangle are in the ratio 1 : 1 : 4. If the perimeter of the triangle is k times its largest side, then what is the value of k ?$
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83 $\text{cm}^2$
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84 $In a circle of radius 8 cm, AB and AC are two chords such that AB = AC = 12 cm. What is the length of chord BC ?$
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85 $Consider the following statements : 1. An isosceles trapezium is always cyclic. 2. Any cyclic parallelogram is a rectangle. Which of the above statements is/are correct ?$
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86 $A ladder is resting against a vertical wall and its bottom is 2.5 m away from the wall. If it slips 0.8 m down the wall, then its bottom will move away from the wall by 1.4 m. What is the length of the ladder ?$
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87 $10\sqrt{3}$
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88 $Consider the following statements : 1. The number of circles that can be drawn through three non-collinear points is infinity. 2. Angle formed in minor segment of a circle is acute. Which of the above statements is/are correct ?$
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89 $AC - AB < BC$
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90 $AB + BC + CA > 2AD$
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Consider the following for the next three (03) items : A cube is inscribed in a sphere. A right circular cylinder is within the cube touching all the vertical faces. A right circular cone is inside the cylinder. Their heights are same and the diameter of the cone is equal to that of the cylinder.
91 $What is the ratio of the volume of the sphere to that of the cone ?$
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92 $What is the ratio of the volume of the cube to that of the cylinder ?$
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93 $\sqrt{5}$
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Consider the following for the next three (03) items : ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right-angle.
94 $What is the area of triangle ADC ?$
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95 $What is the area of quadrilateral ABCD ?$
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96 $What is the difference between perimeter of triangle ABC and perimeter of triangle ADC ?$
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Consider the following for the next two (02) items : An equilateral triangle ABC is inscribed in a circle of radius $20\sqrt{3}$ cm.
97 $What is the length of the side of the triangle ?$
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98 $The centroid of the triangle ABC is at a distance d from the vertex A. What is d equal to ?$
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Consider the following for the next two (02) items : The sum of length, breadth and height of a cuboid is 22 cm and the length of its diagonal is 14 cm.
99 $What is the surface area of the cuboid ?$
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100 $(S - 3V)$
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Newspaper	Proportion of readers
I	10%
II	30%
III	5%
Both I and II	8%
Both II and III	4%
Both I and III	2%
All the three (I, II and III)	1%

	Part I	Part II	Part III
Speed (kmph)	9	8	7.5
Time (minutes)	50	80	100

x	f
0 - 10	8
10 - 20	12
20 - 30	10
30 - 40	p
40 - 50	9

x	f
8	6
5	4
6	5
10	8
9	9
4	6
7	4

	Item of expenditure	Amount (in Rs.)
1.	Food	2,000
2.	Clothing	660
3.	Fuel and rent	1,200
4.	Education	480
5.	Miscellaneous	1,660

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