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Functions and limits

Class 12 · Mathematics · 8 questions

Name: ____________________   Date: ____________

  1. The limit of (x² - 1) / (x - 1) as x tends to 1 is:

    • A 0
    • B 2
    • C Does not exist
    • D 1
  2. The limit of sin x / x as x tends to 0 is:

    • A 1
    • B -1
    • C Infinity
    • D 0
  3. The limit of (3x + 2) as x tends to 2 is:

    • A 6
    • B 2
    • C 4
    • D 8
  4. A function f is continuous at x = a if the limit as x tends to a equals:

    • A a
    • B f(a)
    • C 1
    • D 0
  5. The limit of (1 + 1/n)^n as n tends to infinity is:

    • A 1
    • B Infinity
    • C 0
    • D e
  6. The limit of 5 as x tends to 3 is:

    • A 0
    • B 8
    • C 3
    • D 5
  7. The limit of (x² - 4) / (x - 2) as x tends to 2 is:

    • A 4
    • B 2
    • C 0
    • D Does not exist
  8. A function is not continuous at a point if:

    • A Its graph is a line
    • B It is defined everywhere
    • C The limit does not equal the function value
    • D It is a polynomial

Answer key

1. B, 2. A, 3. D, 4. B, 5. D, 6. D, 7. A, 8. C

  1. (x + 1)(x - 1) / (x - 1) = x + 1, which tends to 2.

  2. This is a standard limit equal to 1.

  3. Substitute x = 2: 6 + 2 = 8.

  4. Continuity needs the limit to equal the function's value.

  5. This is the definition of the number e.

  6. The limit of a constant is the constant.

  7. It simplifies to x + 2.

  8. A break or jump shows discontinuity.