CAT 2019 Question Paper With Answers & Explanation

QA

Q. 1 Corners are cut off from an equilateral triangle T to produce a regular hexagon H. Then, the ratio of the area of H to the area of T is

1) 2 : 3

2) 4 : 5

3) 3 : 4

4) 5 : 6

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Explanation

Correct Answer

Explanation

Q. 2 Let x and y be positive real numbers such that log₅ (x + y) + log₅ (x – y) = 3, and log₂ y – log₂ x = 1 – log₂ 3. Then xy equals

1) 25

2) 100

3) 150

4) 250

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Explanation

Correct Answer

Explanation

Q. 3 One can use three different transports which move at 10, 20, and 30 kmph, respectively. To reach from A to B, Amal took each mode of transport 1/3 of his total journey time, while Bimal took each mode of transport 1/3 of the total distance. The percentage by which Bimal’s travel time exceeds Amal’s travel time is nearest to

1) 21

2) 22

3) 20

4) 19

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Explanation

Correct Answer

Explanation

Q. 4 With rectangular axes of coordinates, the number of paths from (1, 1) to (8, 10) via (4, 6), where each step from any point (x, y) is either to (x, y + 1) or to (x + 1, y), is

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Explanation

Correct Answer

3920

Explanation

Q. 5 At their usual efficiency levels, A and B together finish a task in 12 days. If A had worked half as efficiently as she usually does, and B had worked thrice as efficiently as he usually does, the task would have been completed in 9 days. How many days would A take to finish the task if she works alone at her usual efficiency?

1) 18

2) 36

3) 12

4) 24

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Explanation

Correct Answer

Explanation

Q. 6 Meena scores 40% in an examination and after review, even though her score is increased by 50%, she fails by 35 marks. If her post-review score is increased by 20%, she will have 7 marks more than the passing score. The percentage score needed for passing the examination is

1) 70

2) 60

3) 75

4) 80

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Explanation

Correct Answer

Explanation

Q. 7 In a race of three horses, the first beat the second by 11 metres and the third by 90 metres. If the second beat the third by 80 metres, what was the length, in metres, of the racecourse?

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Explanation

Correct Answer

880

Explanation

Q. 8 Consider a function f satisfying f(x + y) = f(x) f(y) where x, y are positive integers, and f(1) = 2. If f(a + 1) + f(a + 2) + ... + f(a + n) = 16(2ⁿ – 1) then a is equal to

Correct Answer
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Explanation

Correct Answer

Explanation

Q. 9 AB is a diameter of a circle of radius 5 cm. Let P and Q be two points on the circle so that the length of PB is 6 cm, and the length of AP is twice that of AQ. Then the length, in cm, of QB is nearest to

1) 9.1

2) 9.3

3) 7.8

4) 8.5

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Explanation

Correct Answer

Explanation

Q. 10 A chemist mixes two liquids 1 and 2. One litre of liquid 1 weighs 1 kg and one litre of liquid 2 weighs 800 gm. If half litre of the mixture weighs 480 gm, then the percentage of liquid 1 in the mixture, in terms of volume, is

1) 70

2) 85

3) 75

4) 80

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Explanation

Correct Answer

Explanation

Q. 11 Let T be the triangle formed by the straight line 3x + 5y – 45 = 0 and the coordinate axes. Let the circumcircle of T have radius of length L, measured in the same unit as the coordinate axes. Then, the integer closest to L is

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Explanation

Correct Answer

Explanation

Q. 12 On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs. 7. If he sells the pen at 5% gain and the book at 10% gain, he gains Rs. 13. What is the cost price of the book in Rupees?

1) 80

2) 85

3) 95

4) 100

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Explanation

Correct Answer

Explanation

Q. 13 The income of Amala is 20% more than that of Bimala and 20% less than that of Kamala. If Kamala's income goes down by 4% and Bimala's goes up by 10%, then the percentage by which Kamala's income would exceed Bimala's is nearest to

1) 29

2) 31

3) 28

4) 32

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Explanation

Correct Answer

Explanation

Q. 14 The product of the distinct roots of |x² – x – 6| = x + 2 is

1) –24

2) –16

3) –8

4) –4

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Explanation

Correct Answer

Explanation

Q. 15 Two cars travel the same distance starting at 10:00 am and 11:00 am, respectively, on the same day. They reach their common destination at the same point of time. If the first car travelled for at least 6 hours, then the highest possible value of the percentage by which the speed of the second car could exceed that of the first car is

1) 20

2) 25

3) 30

4) 10

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Explanation

Correct Answer

Explanation

Q. 16 The number of solutions to the equation |x|(6x² + 1) = 5x² is

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Explanation

Q. 17 The wheels of bicycles A and B have radii 30 cm and 40 cm, respectively. While traveling a certain distance, each wheel of A required 5000 more revolutions than each wheel of B. If bicycle B traveled this distance in 45 minutes, then its speed, in km per hour, was

1) 18π

2) 12π

3) 16π

4) 14π

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Explanation

Correct Answer

Explanation

Q. 18 For any positive integer n, let f(n) = n(n + 1) if n is even, and f(n) = n + 3 if n is odd.

If m is a positive integer such that 8f(m + 1) – f(m) = 2, then m equals

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Explanation

Correct Answer

Explanation

Q. 19 The product of two positive numbers is 616. If the ratio of the difference of their cubes to the cube of their difference is 157:3, then the sum of the two numbers is

1) 85

2) 95

3) 58

4) 50

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Explanation

Correct Answer

Explanation

Q. 20 The number of the real roots of the equation 2cos (x (x + 1)) = 2^x + 2^–x is

1) 1

2) 0

3) infinite

4) 2

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Correct Answer

Explanation

Q. 21 If a₁ + a₂ + a₃ + ... + a_n = 3(2_n+1 – 2), for every n ≥ 1, then a₁₁ equals

Correct Answer
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Explanation

Correct Answer

6144

Explanation

Q. 22 In a circle of radius 11 cm, CD is a diameter and AB is a chord of length 20.5 cm. If AB and CD intersect at a point E inside the circle and CE has length 7 cm, then the difference of the lengths of BE and AE, in cm, is

1) 3.5

2) 1.5

3) 2.5

4) 0.5

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Explanation

Correct Answer

Explanation

Q. 23 A person invested a total amount of Rs 15 lakh. A part of it was invested in a fixed deposit earning 6% annual interest, and the remaining amount was invested in two other deposits in the ratio 2 : 1, earning annual interest at the rates of 4% and 3%, respectively. If the total annual interest income is Rs 76000 then the amount (in Rs lakh) invested in the fixed deposit was

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Explanation

Correct Answer

Explanation

Q. 24

1) –24

2) –16

3) –12

4) –20

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Explanation

Correct Answer

Explanation

Q. 25 Let S be the set of all points (x, y) in the x-y plane such that | x | + | y | ≤ 2 and | x | ≥ 1. Then, the area, in square units, of the region represented by S equals

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Correct Answer

Explanation

Q. 26 A club has 256 members of whom 144 can play football, 123 can play tennis, and 132 can play cricket. Moreover, 58 members can play both football and tennis, 25 can play both cricket and tennis, while 63 can play both football and cricket. If every member can play at least one game, then the number of members who can play only tennis is

1) 32

2) 43

3) 38

4) 45

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Explanation

Correct Answer

Explanation

Q. 27 Three men and eight machines can finish a job in half the time taken by three machines and eight men to finish the same job. If two machines can finish the job in 13 days, then how many men can finish the job in 13 days?

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Explanation

Q. 28 Amala, Bina, and Gouri invest money in the ratio 3 : 4 : 5 in fixed deposits having respective annual interest rates in the ratio 6 : 5 : 4. What is their total interest income (in Rs) after a year, if Bina's interest income exceeds Amala's by Rs 250?

1) 7000

2) 6000

3) 7250

4) 6350

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Explanation

Correct Answer

Explanation

Q. 29

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Explanation

Q. 30 Ramesh and Gautam are among 22 students who write an examination. Ramesh scores 82.5. The average score of the 21 students other than Gautam is 62. The average score of all the 22 students is one more than the average score of the 21 students other than Ramesh. The score of Gautam is

1) 51

2) 53

3) 48

4) 49

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Q. 31

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Q. 32 In a class, 60% of the students are girls and the rest are boys. There are 30 more girls than boys. If 68% of the students, including 30 boys, pass an examination, the percentage of the girls who do not pass is

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Explanation

Correct Answer

Explanation

Q. 33 If the population of a town is p in the beginning of any year then it becomes 3 + 2p in the beginning of the next year. If the population in the beginning of 2019 is 1000, then the population in the beginning of 2034 will be

1) (1003)2¹⁵ – 3

2) (997)2¹⁴ + 3

3) (997)¹⁵ – 3

4) (1003)¹⁵ + 6

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Explanation

Correct Answer

Explanation

Q. 34

1) 1

2) 2/3

3) 1/3

4) 3

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Explanation

CAT 2019 QA - Slot 1