CAT 2019 Question Paper With Answers & Explanation

QA

Q. 1 In an examination, Rama's score was one-twelfth of the sum of the scores of Mohan and Anjali. After a review, the score of each of them increased by 6. The revised scores of Anjali, Mohan, and Rama were in the ratio 11:10:3. Then Anjali's score exceeded Rama's score by

1) 24

2) 26

3) 35

4) 32

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Explanation

Correct Answer

Explanation

Q. 2 The base of a regular pyramid is a square and each of the other four sides is an equilateral triangle, length of each side being 20 cm. The vertical height of the pyramid, in cm, is

3) 12

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Correct Answer

Explanation

Q. 3 Let ABC be a right-angled triangle with hypotenuse BC of length 20 cm. If AP is perpendicular on BC, then the maximum possible length of AP, in cm, is

2) 5

4) 10

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Correct Answer

Explanation

Q. 4 The quadratic equation x² + bx + c = 0 has two roots 4a and 3a, where a is an integer. Which of the following is a possible value of b² + c ?

1) 361

2) 549

3) 427

4) 3721

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Correct Answer

Explanation

Q. 5 The strength of a salt solution is p% if 100 ml of the solution contains p grams of salt. Each of three vessels A, B, C contains 500 ml of salt solution of strengths 10%, 22%, and 32%, respectively. Now, 100 ml of the solution in vessel A is transferred to vessel B. Then, 100 ml of the solution in vessel B is transferred to vessel C. Finally, 100 ml of the solution in vessel C is transferred to vessel A. The strength, in percentage, of the resulting solution in vessel A is

1) 13

2) 15

3) 14

4) 12

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Correct Answer

Explanation

Q. 6 In 2010, a library contained a total of 11500 books in two categories - fiction and non-fiction. In 2015, the library contained a total of 12760 books in these two categories. During this period, there was 10% increase in the fiction category while there was 12% increase in the non-fiction category. How many fiction books were in the library in 2015?

1) 6000

2) 6160

3) 5500

4) 6600

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Explanation

Correct Answer

Explanation

Q. 7 Two ants A and B start from a point P on a circle at the same time, with A moving clock-wise and B moving anti-clockwise. They meet for the first time at 10:00 am when A has covered 60% of the track. If A returns to P at 10:12 am, then B returns to P at

1) 10:18 am

2) 10:27 am

3) 10:25 am

4) 10:45 am

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Explanation

Correct Answer

Explanation

Q. 8 The number of common terms in the two sequences: 15, 19, 23, 27, . . . . , 415 and 14, 19, 24, 29, . . . , 464 is

1) 21

2) 20

3) 18

4) 19

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Correct Answer

Explanation

Q. 9 Two circles, each of radius 4 cm, touch externally. Each of these two circles is touched externally by a third circle. If these three circles have a common tangent, then the radius of the third circle, in cm, is

1) 1

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Q. 10 Let A be a real number. Then the roots of the equation x² – 4x – log₂A = 0 are real and distinct if and only if

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Q. 11 In a triangle ABC, medians AD and BE are perpendicular to each other, and have lengths 12 cm and 9 cm, respectively. Then, the area of triangle ABC, in sq cm, is

1) 78

2) 80

3) 68

4) 72

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Explanation

Q. 12

1) 16

2) 12

3) 6

4) 8

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Q. 13 John jogs on track A at 6 kmph and Mary jogs on track B at 7.5 kmph. The total length of tracks A and B is 325 metres. While John makes 9 rounds of track A, Mary makes 5 rounds of track B. In how many seconds will Mary make one round of track A?

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Explanation

Q. 14 If (2n + 1) + (2n + 3) + (2n + 5) ... + (2n + 47)
= 5280, then what is the value of 1 + 2 + 3 + ... + n?

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Explanation

Correct Answer

4851

Explanation

Q. 15

1) 1 ≤ x ≤ 3

2) –1 ≤ x ≤ 3

3) –3 ≤ x ≤ 3

4) 1 ≤ x ≤ 2

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Q. 16

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150

Explanation

Q. 17 How many pairs (m, n) of positive integers satisfy the equation m² + 105 = n²?

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Q. 18 The real root of the equation 2^6x + 2^{3x + 2} – 21 = 0 is

1) log₂9

2) log₂27

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Explanation

Q. 19 A man makes complete use of 405 cc of iron, 783 cc of aluminium, and 351 cc of copper to make a number of solid right circular cylinders of each type of metal. These cylinders have the same volume and each of these has radius 3 cm. If the total number of cylinders is to be kept at a minimum, then the total surface area of all these cylinders, in sq cm, is

1) 928π

2) 1044(4 + π)

3) 1026(1 + π)

4) 8464π

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Correct Answer

Explanation

Q. 20 If 5^x – 3^y = 13438 and 5^x–1 + 3^y+1 = 9686, then x + y equals

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Q. 21 How many factors of 2⁴ × 3⁵ × 10⁴ are perfect squares which are greater than 1?

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Q. 22

1) 0

2) 1

3) –1

4) 10

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Q. 23 Let a, b, x, y be real numbers such that a² + b² = 25, x² + y² = 169, and ax + by = 65. If k = ay – bx, then

3) k = 0

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Explanation

Q. 24 Amal invests Rs 12000 at 8% interest, compounded annually, and Rs 10000 at 6% interest, compounded semi-annually, both investments being for one year. Bimal invests his money at 7.5% simple interest for one year. If Amal and Bimal get the same amount of interest, then the amount, in Rupees, invested by Bimal is

Correct Answer
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Explanation

Correct Answer

20920

Explanation

Q. 25 A cyclist leaves A at 10 am and reaches B at 11 am. Starting from 10:01 am, every minute a motor cycle leaves A and moves towards B. Forty-five such motor cycles reach B by 11 am. All motor cycles have the same speed. If the cyclist had doubled his speed, how many motor cycles would have reached B by the time the cyclist reached B?

1) 23

2) 20

3) 15

4) 22

Correct Answer
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Explanation

Correct Answer

Explanation

Since 45 motor cycles reach point B and 11 pm, the last motorcycle must have left at 10 : 45 and reached by 11 pm. So the whole journey takes 15 minutes to cover by motor cycle.
If cyclist doubles his speed, he will reach point B in 30 minutes. Since motorcycle takes 15 minutes to cover the distance, the first motorcycle reaches at 10 : 16 and in total 15 motor cycles would reach by when B reached.

Q. 26 In a six-digit number, the sixth, that is, the rightmost, digit is the sum of the first three digits, the fifth digit is the sum of first two digits, the third digit is equal to the first digit, the second digit is twice the first digit and the fourth digit is the sum of fifth and sixth digits. Then, the largest possible value of the fourth digit is

Correct Answer
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Explanation

Correct Answer

Explanation

As per the instruction, let the first digit be a.
The second digit will be 2a
Third digit will be a
Fourth digit will be (2a + 2b + a) = 7a
Fifth digit will be 3a
Sixth digit will be 4a
∴ Largest value of fourth digit can only be 7.

Q. 27 Anil alone can do a job in 20 days while Sunil alone can do it in 40 days. Anil starts the job, and after 3 days, Sunil joins him. Again, after a few more days, Bimal joins them and they together finish the job. If Bimal has done 10% of the job, then in how many days was the job done?

1) 14

2) 15

3) 12

4) 13

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Explanation

Q. 28 In an examination, the score of A was 10% less than that of B, the score of B was 25% more than that of C, and the score of C was 20% less than that of D. If A scored 72, then the score of D was

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Q. 29 John gets Rs 57 per hour of regular work and Rs 114 per hour of overtime work. He works altogether 172 hours and his income from overtime hours is 15% of his income from regular hours. Then, for how many hours did he work overtime?

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Q. 30 The average of 30 integers is 5. Among these 30 integers, there are exactly 20 which do not exceed 5. What is the highest possible value of the average of these 20 integers?

1) 4.5

2) 4

3) 5

4) 3.5

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Q. 31 Mukesh purchased 10 bicycles in 2017, all at the same price. He sold six of these at a profit of 25% and the remaining four at a loss of 25%. If he made a total profit of Rs. 2000, then his purchase price of a bicycle, in Rupees, was

1) 8000

2) 2000

3) 6000

4) 4000

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Explanation

Q. 32 The salaries of Ramesh, Ganesh and Rajesh were in the ratio 6:5:7 in 2010, and in the ratio 3:4:3 in 2015. If Ramesh’s salary increased by 25% during 2010-2015, then the percentage increase in Rajesh’s salary during this period is closest to

1) 10

2) 8

3) 7

4) 9

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Correct Answer

Explanation

Q. 33 Let f be a function such that f (mn) = f (m) f (n) for every positive integers m and n. If f (1), f (2) and f (3) are positive integers, f (1) < f (2), and f (24) = 54, then f (18) equals

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Q. 34

1) 0.7

2) 1

3) 1.2

4) 0.50

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Explanation

CAT 2019 QA - Slot 2