CAT Questions | CAT Arithmetic

CAT Quantitative Aptitude | CAT Exponents and Logarithms

CAT Exponents and Logarithms Questions are one of the most commonly tested topics in CAT exam. Questions from Exponents and Logarithms have appeared consistently in the CAT exam for the last several years. Questions from Exponents and Logarithms range from very easy to very hard. The basic concept is very easy, learn the concepts and practice a wide range of CAT Questions from 2IIM. One can usually expect 2-3 questions from Logarithms and Exponents in the CAT exam. Make use of 2IIMs Free CAT Questions, provided with detailed solutions and Video explanations to obtain a wonderful CAT score. If you would like to take these questions as a Quiz, head on here to take these questions in a test format, absolutely free.

  1. CAT Exponents and Logarithms: Inequalities

    If log2X + log4X = log0.25√6 and x > 0, then x is

    1. 6-1/6
    2. 61/6
    3. 3-1/3
    4. 61/3
    Choice A
    6-1/6

  2. CAT Exponents and Logarithms: Simple

    log9 (3log2 (1 + log3 (1 + 2log2x))) = \\frac{1}{2}\\). Find x.

    1. 4
    2. \\frac{1}{2}\\)
    3. 1
    4. 2
    Choice D
    2

  3. CAT Exponents and Logarithms: Quadratic Equations

    If 22x+4 – 17 × 2x+1 = –4, then which of the following is true?

    1. x is a positive value
    2. x is a negative value
    3. x can be either a positive value or a negative value
    4. None of these
    Choice C
    x can be either a positive value or a negative value

  4. CAT Exponents and Logarithms: Algebra

    If log1227 = a, log916 = b, find log8108.

    1. \\frac{2(a + 3)}{3b}\\)
    2. \\frac{2(a + 3)}{3a}\\)
    3. \\frac{2(b + 3)}{3a}\\)
    4. \\frac{2(b + 3)}{3b}\\)
    Choice D
    \\frac{2(b + 3)}{3b}\\)

  5. CAT Exponents and Logarithms: Inequalities

    \\frac{log_3(x-3)}{log_3(x-5)}\\) < 0. If a, b are integers such that x = a, and x = b satisfy this inequation, find the maximum possible value of a – b.

    1. 214
    2. 216
    3. 200
    4. 203
    Choice A
    214

  6. CAT Exponents and Logarithms: Different bases

    log5x = a (This should be read as log X to the base 5 equals a) log20x = b. What is logx10?

    1. \\frac{a + b}{2ab}\\)
    2. (a + b) * 2ab
    3. \\frac{2ab}{a + b}\\)
    4. \\frac{a + b}{2}\\)
    Choice A
    \\frac{a + b}{2ab}\\)

  7. CAT Exponents and Logarithms: Basic identities of Logarithm

    log3x + logx3 = \\frac{17}{4}\\). Find the value of x.

    1. 34
    2. 31/4
    3. 34 or 31/4
    4. 31/3
    Choice C
  8. 34 or 31/4

  • CAT Exponents and Logarithms: Basic identities of Logarithm

    logxy + logyx2 = 3. Find logxy3.

    1. 4
    2. 3
    3. 31/2
    4. 31/16
    Choice B
    3

  • CAT Exponents and Logarithms: Basic identities of Logarithm

    If log2 4 * log4 8 * log8 16 * ……………nth term = 49, what is the value of n?

    1. 49
    2. 48
    3. 34
    4. 24
    Choice B
    48

  • CAT Exponents and Logarithms: Basic identities of Logarithm

    If 33 + 6 + 9 + ……… 3x = (0.\\overline{037}\\))-66, what is the value of x?

    1. 3
    2. 6
    3. 7
    4. 11
    Choice D
    11

  • CAT Exponents and Logarithms: Basic identities of Logarithm

    x, y, z are 3 integers in a geometric sequence such that y - x is a perfect cube.
    Given, log36x2 + log6√y + 3log216y1/2z = 6. Find the value of x + y + z.

    1. 189
    2. 190
    3. 199
    4. 201
    Choice A
    189

  • CAT Exponents and Logarithms: Basic identities of Logarithm

    10log(3 - 10logy) = log2(9 - 2y), Solve for y.

    1. 0
    2. 3
    3. 0 and 3
    4. none of these
    Choice D
    none of these

  • CAT Exponents and Logarithms: Value of x

    46+12+18+24+…+6x = (0.0625)-84, what is the value of x?

    1. 7
    2. 6
    3. 9
    4. 12
    Choice A
    7

  • The following questions are from IPMAT Rohtak and Indore sample papers. If you want to take these questions as a mock please click below.

    IPMAT Rohtak Sample Paper Mock
    IPMAT Indore Sample Paper Mock

    Please note that the explanation button will take you to the IPMAT solution page.


  • IPMAT 2020 Sample Paper - IPM Rohtak Quants,Exponents and Logarithms

    Simplification: \25^{(2.7)} \times 5^{(4.2)} \div 5^{(5.4)} = ?\\)

    1. 54
    2. 5(3.2)
    3. 5(4.1)
    4. 5(4.2)
    Choice D
    5(4.2)

  • IPMAT 2019 Question Paper - IPM Indore Quants,Exponents and Logarithms

    Suppose that a, b, and c are real numbers greater than 1. Then the value of \\frac{1}{1+\log _{a^{2} b} \frac{c}{a}}+\frac{1}{1+\log _{b^{2} c} \frac{a}{b}}+\frac{1}{1+\log _{c^{2} a} \frac{b}{c}}\\) is

    3

  • IPMAT 2019 Question Paper - IPM Indore Quants,Exponents and Logarithms

    The value of \\log _{3} 30^{-1} + \log _{4} 900^{-1} + \log _{5} 30^{-1}\\) is

    1. 0.5
    2. 30
    3. 2
    4. 1
    Choice D
    1

  • IPMAT 2019 Question Paper - IPM Indore Quants,Exponents and Logarithms

    The inequality \\log _{a}{f(x)} < \log _{a}{g(x)}\\) implies that

    1. f(x) > g(x) > 0 for 0 < a < 1 and g(x) > f(x) > 0 for a > 1
    2. g(x) > f(x) > 0 for 0 < a < 1 and f(x) > g(x) > 0 for a > 1
    3. f(x) > g(x) > 0 for a > 0
    4. g(x) > f(x) > 0 for a > 0
    Choice A
    \(f(x)>g(x)>0\) for \(0f(x)>0\) for \(a>1\)

  • The Questions that follow, are from actual CAT papers. If you wish to take them separately or plan to solve actual CAT papers at a later point in time, It would be a good idea to stop here.


    1. CAT 2017 Question Paper Slot 1 - Exponents & Logarithms

      Suppose, log3x = log12y = a, where x, y are positive numbers. If G is the geometric mean of x and y, and log6G is equal to:

      1. √a
      2. 2a
      3. \\frac{a}{2})
      4. a
      Choice D
      a

    2. CAT 2017 Question Paper Slot 1 - Exponents & Logarithms

      The value of log0.008√5 + log√381 – 7 is equal to:

      1. \\frac{1}{3})
      2. \\frac{2}{3})
      3. \\frac{5}{6})
      4. \\frac{7}{6})
      Choice C
      \\frac{5}{6})

    3. CAT 2017 Question Paper Slot 1 - Exponents & Logarithms

      If 92x – 1 – 81x-1 = 1944, then x is

      1. 3
      2. \\frac{9}{4})
      3. \\frac{4}{9})
      4. \\frac{1}{3})
      Choice B
      \\frac{9}{4})

    4. CAT 2017 Question Paper Slot 2 - Exponents & Logarithms

      If x is a real number such that log35 = log5(2 + x), then which of the following is true?

      1. 0 < x < 3
      2. 23 < x < 30
      3. x > 30
      4. 3 < x < 23
      Choice D
      3 < x < 23

    5. CAT 2017 Question Paper Slot 2 - Exponents & Logarithms

      If 9x - (\\frac{1}{2})) – 22x – 2 = 4x – 32x – 3, then x is

      1. \\frac{3}{2}\\)
      2. \\frac{2}{5}\\)
      3. \\frac{3}{4}\\)
      4. \\frac{4}{9}\\)
      Choice A
      \\frac{3}{2}\\)

    6. CAT 2017 Question Paper Slot 2 - Exponents & Logarithms

      If log(2a × 3b × 5c) is the arithmetic mean of log(22 × 33 × 5), log(26 × 3 × 57), and log(2 × 32 × 54), then a equals [TITA]

      3

    7. CAT 2018 Question Paper Slot 1 - Logarithm

      If x is a positive quantity such that 2x = 3log52 , then x is equal to

      1. log59
      2. 1 + log5\\frac{3}{5})
      3. 1 + log3\\frac{5}{3})
      4. log58
      Choice B
      1 + log5\\frac{3}{5})

    8. CAT 2018 Question Paper Slot 1 - Logarithm

      If log1281 = p, then 3(\\frac{4 - p}{4 + p})) is equal to:

      1. log28
      2. log68
      3. log416
      4. log616
      Choice B
      log68

    9. CAT 2018 Question Paper Slot 1 - Exponents

      Given that x2018 y2017 = 1/2 and x2016 y2019 = 8, the value of x2 + y3 is

      1. \\frac{37}{4})
      2. \\frac{31}{4})
      3. \\frac{35}{4})
      4. \\frac{33}{4})
      Choice D
      \\frac{33}{4})

    10. CAT 2018 Question Paper Slot 1 - Logarithms

      If log2(5 + log3a) = 3 and log5(4a + 12 + log2b) = 3, then a + b is equal to

      1. 32
      2. 59
      3. 67
      4. 40
      Choice B
      59

    11. CAT 2018 Question Paper Slot 2 - Logarithm

      If p3 = q4 = r5 = s6, then the value of logs (pqr) is equal to

      1. \\frac{24}{5}\\)
      2. 1
      3. \\frac{47}{10}\\)
      4. \\frac{16}{5}\\)
      Choice C
      \\frac{47}{10}\\)

    12. CAT 2018 Question Paper Slot 2 - Logarithm

      \\frac{1}{log_{2}100}\\) - \\frac{1}{log_{4}100}\\) + \\frac{1}{log_{5}100}\\) - \\frac{1}{log_{10}100}\\) + \\frac{1}{log_{20}100}\\) - \\frac{1}{log_{25}100}\\) + \\frac{1}{log_{50}100}\\) = ?

      1. 0
      2. \\frac{1}{2}\\)
      3. -4
      4. 10
      Choice B
      \\frac{1}{2}\\)

    13. CAT 2019 Question Paper Slot 1 - Exponents

      If (5.55)x = (0.555)y = 1000, then the value of \\frac{1}{x}) - \\frac{1}{y}) is

      1. 1
      2. \\frac{1}{3})
      3. \\frac{2}{3})
      4. 3
      Choice B
      \\frac{1}{3})

    14. CAT 2019 Question Paper Slot 1 - Exponents

      If m and n are integers such that (\\sqrt{2}))19 34 42 9m 8n = 3n 16m (∜64) then m is

      1. -16
      2. -24
      3. -12
      4. -20
      Choice C
      -12

    15. CAT 2019 Question Paper Slot 1 - Logarithms

      Let x and y be positive real numbers such that log5(x + y) + log5(x − y) = 3, and log2y − log2x = 1 − log23. Then xy equals

      1. 25
      2. 150
      3. 250
      4. 100
      Choice B
      150

    16. CAT 2019 Question Paper Slot 2 - Logarithms

      The real root of the equation 26x + 23x+2 - 21 = 0 is

      1. \\frac{log_{2}3}{3})
      2. log29
      3. \\frac{log_{2}7}{3})
      4. log227
      Choice A
      \\frac{log_{2}3}{3})

    17. CAT 2019 Question Paper Slot 2 - Logarithms

      If x is a real number ,then \\sqrt{log_{e}\frac{4x - x^2}{3}}) is a real number if and only if

      1. -3 ≤ x ≤ 3
      2. 1 ≤ x ≤ 2
      3. 1 ≤ x ≤ 3
      4. -1 ≤ x ≤ 3
      Choice C
      1 ≤ x ≤ 3

    18. CAT 2019 Question Paper Slot 2 - Exponents & Powers

      If 5x – 3y = 13438 and 5x-1 + 3y+1 = 9686 , then x+y equals [TITA]

      13

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