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DSE M1 Exponential and Logarithmic Functions Practice

DSE M1 · 60 practice questions with instant marking and worked solutions.

Exponential and Logarithmic Functions is an important part of the DSE M1 mathematics curriculum. This topic develops the number e, natural logarithms, the series for e^x, growth and decay models and linearising with logarithms. Begin by identifying what every number, symbol, diagram and unit represents. Translate the information into a mathematical relationship before calculating. Each line of working should have a purpose. Finally use estimation, substitution, an inverse operation, or a second representation to check the result. This habit separates a misunderstanding from a copying error and makes correction more useful.

A reliable approach to Exponential and Logarithmic Functions has four stages. First, mark the given information and the quantity required. Second, choose an appropriate representation, property or formula. Third, carry out the operations in a clear order while retaining signs and units. Fourth, return to the original context and decide whether the result is possible. For a graph or table, read the title, scale and labels before using a value. For algebra, inspect brackets, negative signs and the order of operations before simplifying.

The 60 original questions in this topic use a shared mathematical specification in Chinese and English. Difficulty rises from level 1 to level 5. Early questions establish the language and direct skills of Exponential and Logarithmic Functions; middle questions add two-step reasoning, conversions and common variations; later questions connect ideas and require a deliberate check. In multiple-choice work, calculate before looking at the choices. In fill-in and short-answer work, retain decisive steps. For true-or-false statements, support the decision with a calculation or counterexample. 12 of them are DSE Extended Part style structured questions answered in parts (a), (b), (c), where later parts build on earlier ones.

Effective revision is more than recording a score. After completing the Exponential and Logarithmic Functions set, group errors by concept tags and decide whether each problem arose from interpretation, forming an expression, calculation, or presenting the answer. Retry the item on a later day without opening the solution, then test the same method with a different value. If the same tag appears repeatedly, return to the explanation and rebuild the concept. If signs or units are the issue, use a fixed pre-submission checklist.

Exponential and Logarithmic Functions is closely linked with the rest of the Extended Part: algebraic and trigonometric skills underpin calculus, and calculus in turn supports probability distributions and statistical inference. A learner who can explain aloud why every step is valid has moved beyond imitation. Estimate a reasonable range, complete an exact solution, and compare the two. Agreement between context, estimate and exact answer is strong evidence that the solution is sound.

This batch adds 20 questions, bringing the topic to 60. The new questions cover controlled variations of different concepts, with paired bilingual conditions, hints, worked solutions and reproducible checks.

Start practising

  1. 1 Basic
    Without using a calculator, find the value of $\ln(e^{5}\cdot e^{2})$. Choose the correct answer.
  2. 2 Basic
    Solve $e^{3x+2}=e^{7}$. Find the value of $x$ (as a fraction in lowest terms). Give the answer only.

  3. 3 Basic
    Without using a calculator, find the value of $\frac{\ln 729}{\ln 27}$. Show the essential working and give the answer.

  4. 4 Basic
    A radioactive substance has a half-life of 5 years; there are 80 g now. The mass remaining after 10 years in g is 40. Is this true?
  5. 5 Basic
    Without using a calculator, find the value of $\ln(e^{-3}\cdot e^{5})$. Choose the correct answer.
  6. 6 Basic
    Solve $e^{2x+5}=e^{2}$. Find the value of $x$ (as a fraction in lowest terms). Give the answer only.

  7. 7 Basic
    Without using a calculator, find the value of $\frac{\ln 81}{\ln 243}$ (as a fraction in lowest terms). Show the essential working and give the answer.

  8. 8 Basic
    A radioactive substance has a half-life of 5 years; there are 200 g now. The mass remaining after 15 years in g is 125. Is this true?
  9. 9 Basic
    Without using a calculator, find the value of $\ln(e^{-1}\cdot e^{6})$. Choose the correct answer.
  10. 10 Basic
    Solve $e^{2x+1}=e^{6}$. Find the value of $x$ (as a fraction in lowest terms). Give the answer only.

  11. 11 Basic
    Without using a calculator, find the value of $\frac{\ln 64}{\ln 16}$ (as a fraction in lowest terms). Show the essential working and give the answer.

  12. 12 Basic
    A radioactive substance has a half-life of 8 years; there are 320 g now. The mass remaining after 16 years in g is 160. Is this true?
  13. 13 Standard
    $x$ and $y$ satisfy $\log y=x-1$. Find the value of $y$ when $x=2$. Choose the correct answer.
  14. 14 Standard
    Consider the power series expansion of $(3x+1)e^{4x}$. Find the coefficient of $x^2$. Give the answer only.

  15. 15 Standard
    A bacteria population doubles every 2 hours, starting at 100. Find the number after 10 hours. Show the essential working and give the answer.

  16. 16 Standard DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/5}$ with $t$ in hours, and $N(0)=500$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(15)$.
    3. (c) Find the time in hours for the count to reach $8000$.
  17. 17 Standard
    $x$ and $y$ satisfy $\log y=x+2$. Find the value of $y$ when $x=0$. Choose the correct answer.
  18. 18 Standard
    Consider the power series expansion of $(2x+1)e^{2x}$. Find the coefficient of $x^2$. Give the answer only.

  19. 19 Standard
    A bacteria population doubles every 2 hours, starting at 200. Find the number after 6 hours. Show the essential working and give the answer.

  20. 20 Standard DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/5}$ with $t$ in hours, and $N(0)=100$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(10)$.
    3. (c) Find the time in hours for the count to reach $800$.
  21. 21 Standard
    $x$ and $y$ satisfy $\log y=3x+2$. Find the value of $y$ when $x=1$. Choose the correct answer.
  22. 22 Standard
    Consider the power series expansion of $e^{-2x}$. Find the coefficient of $x^{4}$ (as a fraction in lowest terms). Give the answer only.

  23. 23 Standard
    A bacteria population doubles every 3 hours, starting at 100. Find the number after 9 hours. Show the essential working and give the answer.

  24. 24 Standard DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/4}$ with $t$ in hours, and $N(0)=500$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(16)$.
    3. (c) Find the time in hours for the count to reach $16000$.
  25. 25 Advanced
    Without using a calculator, find the value of $\ln(e^{-1}\cdot e^{1})$. Choose the correct answer.
  26. 26 Advanced
    Solve $e^{2x-3}=e^{9}$. Find the value of $x$. Give the answer only.

  27. 27 Advanced
    Without using a calculator, the value of $\frac{\ln 3125}{\ln 25}$ is 5/2. Is this true?
  28. 28 Advanced DSE long question
    Let $\log_2 M=4$ and $\log_2 N=4$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  29. 29 Advanced
    Without using a calculator, find the value of $\ln(e^{5}\cdot e^{5})$. Choose the correct answer.
  30. 30 Advanced
    Solve $e^{3x+2}=e^{9}$. Find the value of $x$ (as a fraction in lowest terms). Give the answer only.

  31. 31 Advanced
    Without using a calculator, the value of $\frac{\ln 3125}{\ln 125}$ is 5/3. Is this true?
  32. 32 Advanced DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/5}$ with $t$ in hours, and $N(0)=100$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(15)$.
    3. (c) Find the time in hours for the count to reach $1600$.
  33. 33 Advanced
    Without using a calculator, find the value of $\ln(e^{3}\cdot e^{2})$. Choose the correct answer.
  34. 34 Advanced
    Solve $e^{2x-2}=e^{8}$. Find the value of $x$. Give the answer only.

  35. 35 Advanced
    Without using a calculator, the value of $\frac{\ln 9}{\ln 27}$ is 2/3. Is this true?
  36. 36 Advanced DSE long question
    Let $\log_2 M=6$ and $\log_2 N=1$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  37. 37 Challenging
    A radioactive substance has a half-life of 2 years; there are 160 g now. Find the mass remaining after 8 years in g. Choose the correct answer.
  38. 38 Challenging
    $x$ and $y$ satisfy $\log y=2x$. Find the value of $y$ when $x=0$. Show the essential working and give the answer.

  39. 39 Challenging
    Consider the power series expansion of $(x+1)e^{4x}$. The coefficient of $x^2$ is 8. Is this true?
  40. 40 Challenging DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/2}$ with $t$ in hours, and $N(0)=500$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(4)$.
    3. (c) Find the time in hours for the count to reach $4000$.
  41. 41 Challenging
    A radioactive substance has a half-life of 3 years; there are 320 g now. Find the mass remaining after 9 years in g. Choose the correct answer.
  42. 42 Challenging
    $x$ and $y$ satisfy $\log y=3x-1$. Find the value of $y$ when $x=1$. Show the essential working and give the answer.

  43. 43 Challenging
    Consider the power series expansion of $(-x+1)e^{3x}$. The coefficient of $x^2$ is 9/2. Is this true?
  44. 44 Challenging DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/2}$ with $t$ in hours, and $N(0)=200$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(4)$.
    3. (c) Find the time in hours for the count to reach $1600$.
  45. 45 Challenging
    A radioactive substance has a half-life of 5 years; there are 80 g now. Find the mass remaining after 15 years in g. Choose the correct answer.
  46. 46 Challenging
    $x$ and $y$ satisfy $\log y=x+1$. Find the value of $y$ when $x=0$. Show the essential working and give the answer.

  47. 47 Challenging
    Consider the power series expansion of $(x+1)e^{-2x}$. The coefficient of $x^2$ is 2. Is this true?
  48. 48 Challenging DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/2}$ with $t$ in hours, and $N(0)=400$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(6)$.
    3. (c) Find the time in hours for the count to reach $6400$.
  49. 49 Elite
    A bacteria population doubles every 2 hours, starting at 50. Find the number after 10 hours. Give the answer only.

  50. 50 Elite
    Without using a calculator, find the value of $\ln(e^{2}\cdot e^{4})$. Show the essential working and give the answer.

  51. 51 Elite
    Solve $e^{x-4}=e^{4}$. The value of $x$ is 8. Is this true?
  52. 52 Elite DSE long question
    Let $\log_2 M=7$ and $\log_2 N=4$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  53. 53 Elite
    Without using a calculator, find the value of $\ln(e^{4}\cdot e^{1})$. Give the answer only.

  54. 54 Elite
    Without using a calculator, find the value of $\ln(e^{-3}\cdot e^{4})$. Show the essential working and give the answer.

  55. 55 Elite
    Solve $e^{x+4}=e^{4}$. The value of $x$ is 0. Is this true?
  56. 56 Elite DSE long question
    Let $\log_2 M=5$ and $\log_2 N=5$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  57. 57 Elite
    A bacteria population doubles every 5 hours, starting at 500. Find the number after 15 hours. Give the answer only.

  58. 58 Elite
    Without using a calculator, find the value of $\ln(e^{-4}\cdot e^{1})$. Show the essential working and give the answer.

  59. 59 Elite
    Solve $e^{2x-3}=e^{1}$. The value of $x$ is 2. Is this true?
  60. 60 Elite DSE long question
    Let $\log_2 M=4$ and $\log_2 N=5$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.

The report lists what you got wrong and why. Only you can see it.

Common mistakes

Common mistakes in Exponential and Logarithmic Functions

This topic needs particular care with the number e, natural logarithms, the series for e^x, growth and decay models and linearising with logarithms. The first mistake is applying a remembered rule before reading all conditions. The second is compressing working so much that a sign, bracket, decimal point or unit disappears. The third is accepting an impossible answer without checking: for example, a probability above one, a negative physical length, an angle outside the geometric constraints, or a result far from the estimate. Separate the conditions, model, calculation and check, and finish by stating what the answer represents.

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