CAT Questions

Let ABCDEF be a regular hexagon with each side of length 1 cm

Mensuration

Let ABCDEF be a regular hexagon with each side of length 1 cm. The area (in sq cm) of a square with AC as one side is

  1. 3√2
  2. 3
  3. 4
  4. √3

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The base of a vertical pillar with uniform cross section is a trapezium

Mensuration

The base of a vertical pillar with uniform cross section is a trapezium whose parallel sides are of lengths 10 cm and 20 cm while the other two sides are of equal length. The perpendicular distance between the parallel sides of the trapezium is 12 cm. If the height of the pillar is 20 cm, then the total area, in sq cm, of all six surfaces of the pillar is

  1. 1300
  2. 1340
  3. 1480
  4. 1520

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A circle is inscribed in a given square and another circle is circumscribed about the square

Geometry

A circle is inscribed in a given square and another circle is circumscribed about the square. What is the ratio of the area of the inscribed circle to that of the circumscribed circle?

  1. 2 : 3
  2. 3 : 4
  3. 1 : 2
  4. 1 : 4

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A semicircle is drawn with AB as its diameter. From C, a point on AB, a line perpendicular

Geometry

A semicircle is drawn with AB as its diameter. From C, a point on AB, a line perpendicular to AB is drawn meeting the circumference of the semi-circle at D. Given that AC = 2 cm and CD = 6 cm, the area of the semicircle (in sq. cm) will be:

  1. 32 π
  2. 40.5 π
  3. 50 π
  4. 81 π

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Consider obtuse angled triangles with sides 8 cm, 15 cm and x cm

Geometry

Consider obtuse angled triangles with sides 8 cm, 15 cm and x cm. If x is an integer then how many such triangles exist?

  1. 5
  2. 10
  3. 15
  4. 21

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If in the figure below, angle XYZ = 90° and the length of the arc XZ = 10π

Geometry

If in the figure below, angle XYZ = 90° and the length of the arc XZ = 10π, then the area of the sector XYZ is

  1. 10π
  2. 25π
  3. 100π
  4. None of the above

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AB is a chord of a circle. The length of AB is 24 cm

Geometry

AB is a chord of a circle. The length of AB is 24 cm. P is the midpoint of AB. Perpendiculars from P on either side of the chord meets the circle at M and N respectively. If PM < PN and PM = 8 cm. then what will be the length of PN?

  1. 17 cm
  2. 18 cm
  3. 19 cm
  4. 20 cm
  5. 21 cm

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AB, CD and EF are three parallel lines, in that order

Geometry

AB, CD and EF are three parallel lines, in that order. Let d1 and d2 be the distances from CD to AB and EF respectively. d1 and d2 are integers, where d1 : d2 = 2 : 1. P is a point on AB, Q and S are points on CD and R is a point on EF. If the area of the quadrilateral PQRS is 30 square units, what is the value of QR when value of SR is the least?

  1. slightly less than 10 units
  2. 10 units
  3. slightly greater than 10 units
  4. slightly less than 20 units
  5. slightly greater than 20 units

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The points (2, 5) and (6, 3) are two end points of a diagonal of a rectangle

Geometry

The points (2, 5) and (6, 3) are two end points of a diagonal of a rectangle. If the other diagonal has the equation y = 3x + c, then c is

  1. -5
  2. -6
  3. -7
  4. -8

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If n is a positive integer, then (√3+1)^2n - (√3-1)^2n is

Numbers

If n is a positive integer, then (√3+1)2n - (√3−1)2n is

  1. An even positive integer
  2. A rational number other than positive integers
  3. An odd positive integer
  4. An irrational number

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The last digit of the number 3^2015 is

Numbers

The last digit of the number 32015 is

  1. 1
  2. 3
  3. 5
  4. 7

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When we multiply a certain two-digit number

Numbers

When we multiply a certain two-digit number by the sum of its digits, 405 is achieved. If you multiply the number written in reverse order of the same digits, we get 486. Find the number?

  1. 81
  2. 45
  3. 36
  4. 54

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Let p be a prime number greater than 5. Then (p^2 - 1) is

Numbers Divisibility

A positive integer is said to be a prime number if it is not divisible by any positive integer other than itself and 1. Let p be a prime number greater than 5. Then (p2 - 1) is

  1. always divisible by 6, and may or may not be divisible by 12
  2. always divisible by 24
  3. never divisible by 6
  4. always divisible by 12, and may or may not be divisible by 24

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Consider four-digit numbers for which the first two digits are equal

Numbers

Consider four-digit numbers for which the first two digits are equal and the last two digits are also equal. How many such numbers are perfect squares?

  1. 1
  2. 2
  3. 3
  4. 4

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The number of integers n satisfying -–n+2 ≥ 0 and 2n ≥ 4 is

Numbers

The number of integers n satisfying -–n+2 ≥ 0 and 2n ≥ 4 is

  1. 0
  2. 1
  3. 2
  4. 3

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What is the right most non-zero digit of the number 30^2720

Numbers

What is the right most non-zero digit of the number 302720?

  1. 1
  2. 3
  3. 7
  4. 9

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The product of all integers from 1 to 100 will have the following numbers

Numbers

The product of all integers from 1 to 100 will have the following numbers of zeros at the end?

  1. 19
  2. 20
  3. 22
  4. 24

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The sum of four consecutive two-digit odd numbers, when divided by 10

Numbers

The sum of four consecutive two-digit odd numbers, when divided by 10, becomes a perfect square. Which of the following can possibly be one of these four numbers?

  1. 21
  2. 25
  3. 41
  4. 67

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The number of positive integer valued pairs (x, y) satisfying 4x - 17y = 1 and x ≤ 1000 is

Numbers Linear Equations

The number of positive integer valued pairs (x, y) satisfying 4x - 17y = 1 and x ≤ 1000 is

  1. 55
  2. 57
  3. 58
  4. 59

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What are the last two digits of 7^2008

Numbers

What are the last two digits of 72008?

  1. 01
  2. 21
  3. 41
  4. 61

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What is the digit in the unit’s place of 2^51

Numbers

What is the digit in the unit’s place of 251?

  1. 1
  2. 2
  3. 4
  4. 8

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When you reverse the digits of the number 13, the number increases by 18

Numbers

When you reverse the digits of the number 13, the number increases by 18. How many other two-digit numbers increase by 18 when their digits are reversed?

  1. 5
  2. 6
  3. 7
  4. 8

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If N = (11^(p+7)) (7^(q-2)) (5^(r+1)) (3^s) is a perfect cube

Numbers

If N = (11p + 7)(7q – 2)(5r + 1)(3s) is a perfect cube, where p, q, r and s are positive integers, then the smallest value of p + q + r + s is:

  1. 5
  2. 6
  3. 7
  4. 8
  5. 9

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If the product of three consecutive positive integers is 15600

Numbers

If the product of three consecutive positive integers is 15600 then the sum of the squares of these integers is

  1. 1777
  2. 1785
  3. 1875
  4. 1877

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Let f(x) = x^2 and g(x) = 2x, for all real x

Numbers

Let f(x) = x2 and g(x) = 2x, for all real x. Then the value of f(f(g(x)) + g(f(x))) at x = 1 is

  1. 16
  2. 18
  3. 36
  4. 40

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Largest value of min(2 + x^2, 6 - 3x), when x > 0, is

Quant Quadratic

Largest value of min(2 + x2, 6 - 3x), when x > 0, is

  1. 1
  2. 2
  3. 3
  4. 4

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A quadratic function f(x) attains a maximum of 3 at x = 1

Quant Quadratic

A quadratic function f(x) attains a maximum of 3 at x = 1. The value of the function at x = 0 is 1. What is the value f(x) at x = 10?

  1. -180
  2. -159
  3. -110
  4. -119

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If both a and b belong to the set {1, 2, 3, 4}, then the number of equations

Quant Quadratic

If both a and b belong to the set {1, 2, 3, 4}, then the number of equations of the form ax2+ bx + 1 = 0 having real roots is

  1. 6
  2. 7
  3. 10
  4. 12

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Let p and q be the roots of the quadratic equation x^2 - (α-2)x - α - 1 = 0

Quant Quadratic

Let p and q be the roots of the quadratic equation x2 - (α - 2)x - α - 1 = 0. What is the minimum possible value of p2 + q2?

  1. 0
  2. 3
  3. 4
  4. 5

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The number of roots common between the two equations x^3 + 3x^2 + 4x + 5 = 0

Quant Quadratic

The number of roots common between the two equations x3 + 3x2 + 4x + 5 = 0 and x3 + 2x2 + 7x + 3 = 0 is

  1. 0
  2. 1
  3. 2
  4. 3

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One root of x^2 + kx - 8 = 0 is square of the other. Then the value of k is

Quant Quadratic

One root of x2 + kx - 8 = 0 is square of the other. Then the value of k is

  1. 2
  2. -2
  3. 8
  4. -8

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What is the value of m which satisfies 3m^2 - 21m + 30

Quant Quadratic

What is the value of m which satisfies 3m2 - 21m + 30 < 0?

  1. m < 2 or m > 5; 2 < m < 5
  2. 2 < m < 5
  3. m < 2 or m > 5
  4. m > 2

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Which of the following values of x do not satisfy the inequality x^2 - 3x + 2 > 0 at all

Quant Quadratic

Which of the following values of x do not satisfy the inequality x2 - 3x + 2 > 0 at all?

  1. 0 ≥ x ≥ –2
  2. 0 ≤ x ≤ 2
  3. –1 ≥ x ≥ –2
  4. 1 ≤ x ≤ 2

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The minimum possible value of the sum of the squares of the roots

Quant Quadratic

The minimum possible value of the sum of the squares of the roots of the equation x2 + (a + 3)x - (a + 5) = 0 is

  1. 1
  2. 2
  3. 3
  4. 4

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What is the sum of the following series? - 64, - 66, - 68, ..., - 100

Progressions

What is the sum of the following series?

- 64, - 66, - 68, …… , - 100

  1. - 1458
  2. - 1558
  3. - 1568
  4. - 1664
  5. None of the above

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If three positive real numbers x, y and z satisfy y - x = z - y and xyz = 4

Progressions

If three positive real numbers x, y and z satisfy y - x = z - y  and xyz = 4, then what is the minimum possible value of y?

  1. 2(1/4)
  2. 2(2/3)
  3. 2(1/3)
  4. 2(3/4)

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If log3 2, log3 (2^x - 5), log3 (2^x - 7/2) are in arithmetic progression

Progressions Logarithms

If log3 2, log3 (2x - 5), log3 (2x - 7/2) are in arithmetic progression, then the value of x is equal to

  1. 2
  2. 3
  3. 4
  4. 5

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Consider a triangle drawn on the X-Y plane with its three vertices of (41, 0), (0, 41) and (0, 0)

Progressions Linear Equations

Consider a triangle drawn on the X-Y plane with its three vertices of (41, 0), (0, 41) and (0, 0), each vertex being represented by its (X, Y) coordinates. The number of points with integer coordinates inside the triangle (excluding all the points on the boundary) is

  1. 741
  2. 780
  3. 800
  4. 820

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Consider the set S = {1, 2, 3, ..., 1000}. How many arithmetic progressions can be formed

Progressions

Consider the set S = {1, 2, 3, ..., 1000}. How many arithmetic progressions can be formed from the elements of S that start with 1 and end with 1000 and have at least 3 elements?

  1. 3
  2. 4
  3. 6
  4. 7

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For a Fibonacci sequence, from the third term onwards, each term in the sequence

Progressions

For a Fibonacci sequence, from the third term onwards, each term in the sequence is the sum of the previous two terms in that sequence. If the difference in squares of 7th and 6th terms of this sequence is 517, what is the 10th term of this sequence?

  1. 76
  2. 108
  3. 123
  4. 147

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Fourth term of an arithmetic progression is 8. What is the sum of the first 7 terms

Progressions

Fourth term of an arithmetic progression is 8. What is the sum of the first 7 terms of the arithmetic progression?

  1. 7
  2. 35
  3. 56
  4. 64

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If the harmonic mean between two positive numbers is to their geometric mean as 12:13

Progressions

If the harmonic mean between two positive numbers is to their geometric mean as 12 : 13; then the numbers could be in the ratio

  1. 12 : 13
  2. 4 : 9
  3. 2 : 3
  4. 1/12 : 1/13

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The number of common terms in the two sequences 17, 21, 25, ...,

Progressions

The number of common terms in the two sequences 17, 21, 25, ..., 417 and 16, 21, 26, ..., 466 is

  1. 19
  2. 20
  3. 77
  4. 78

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The integers 1, 2, ..., 40 are written on a blackboard. The following operation

Progressions

The integers 1, 2, ..., 40 are written on a blackboard. The following operation is then repeated 39 times: In each repetition, any two numbers, say a and b, currently on the blackboard are erased and a new number a + b - 1 is written. What will be the number left on the board at the end?

  1. 821
  2. 820
  3. 819
  4. 781

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If p, q and r are three unequal numbers such that p, q and r are in AP

Progressions

If p, q and r are three unequal numbers such that p, q and r are in A.P., and p, r-q and q-p are in G.P., then p : q : r is equal to

  1. 1 : 2 : 3
  2. 2 : 3 : 4
  3. 3 : 2 : 1
  4. 1 : 3 : 4

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Seema has joined a new Company after the completion of her B.Tech

Progressions

Seema has joined a new Company after the completion of her B.Tech from a reputed engineering college in Chennai. She saves 10% of her income in each of the first three months of her service and for every subsequent month, her savings are Rs. 50 more than the savings of the immediate previous month. If her joining income was Rs. 3000, her total savings from the start of the service will be Rs. 11400 in

  1. 6 months
  2. 12 months
  3. 18 months
  4. 24 months

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The sum of series, (–100) + (–95) + (–90) + …

Progressions

The sum of series, (–100) + (–95) + (–90) + …………+ 110 + 115 + 120, is:

  1. 0
  2. 220
  3. 340
  4. 450
  5. None of the above

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An infinite geometric progression a1, a2, a3, ... has the property

Progressions

An infinite geometric progression a1, a2, a3, ... has the property that an = 3(an+1 + an+2 +…) for every n ≥ 1. If the sum a1 + a2 + a3 + … = 32, then a5 is

  1. 1/32
  2. 2/32
  3. 3/32
  4. 4/32

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The Maximum Retail Price (MRP) of a product is 55% above its manufacturing cost

Profit Loss

The Maximum Retail Price (MRP) of a product is 55% above its manufacturing cost. The product is sold through a retailer, who earns 23% profit on his purchase price. What is the profit percentage (expressed in nearest integer) for the manufacturer who sells his product to the retailer? The retailer gives 10% discount on MRP.

  1. 31%
  2. 22%
  3. 15%
  4. 13%
  5. 11%

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A dealer offers a cash discount of 20% and still makes a profit of 20%

Profit Loss

A dealer offers a cash discount of 20% and still makes a profit of 20%, when he further allows 16 articles to a dozen to a particularly sticky bargainer. How much percent above the cost price were his wares listed?

  1. 75%
  2. 66 2/3%
  3. 100%
  4. 80%

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