# Class 12 Maths MCQ – Continuity and Differentiability

This set of Class 12 Maths Chapter 5 Multiple Choice Questions & Answers (MCQs) focuses on “Continuity and Differentiability”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.

1. What is the mathematical expression for the definition of continuity?
a) limx→c⁡f(x) = f(c) ∀ c ∈ a
b) limx→c⁡f(x) = f(c) ∀ c ∈ (a,b)
c) limx→c⁡f(x) = f(c) ∀ c ∈ b
d) limx→a⁡f(x) = f(c) ∀ c ∈ (a,b)

Explanation: A function f defined on (a,b) is said to be continuous on (a,b) if it is continuous at every point of (a,b) i.e., if limx→c⁡f(x)=f(c) ∀ c ∈ (a,b).

2. What is the mathematical expression for f is continuous on (a,b)?
a) limx→c⁡f(x) = f(c) ∀ c ∈ a
b) limx→c⁡f(x) = f(c) ∀ c ∈ (a,b)
c) limx→c⁡f(x) = f(c) ∀ c ∈ b
d) limx→a⁡f(x) = f(c) ∀ c ∈ (a,b)

Explanation: A function f defined on (a,b) is said to be continuous on (a,b) if it is continuous at every point of (a,b) i.e., if limx→c⁡f(x)=f(c) ∀ c ∈ (a,b).

3. What is the mathematical expression for f is right continuous on (a,b)?
a) limx→a+⁡f(x)=f(a)
b) limx→a+⁡f(x)=f(b)
c) limx→b+⁡f(x)=f(a)
d) limx→a-⁡f(x)=f(a)

Explanation: A function is said to be continuous when it is both left continuous and right continuous. Mathematical expression for a function f is right continuous on (a,b) is limx→a+⁡f(x)=f(a).

4. What is the mathematical expression for f is left continuous on (a,b)?
a) limx→a-⁡f(x)=f(a)
b) limx→b-⁡f(x)=f(b)
c) limx→a+⁡f(x)=f(b)
d) limx→b+⁡f(x)=f(b)

Explanation: A function is said to be continuous when it is both left continuous and right continuous. Mathematical expression for a function f is left continuous on (a,b) is limx→a+⁡f(x)=f(a).

5. f(x) = c ∀ x ∈ R is continuous on R for a fixed c ∈ R.
a) False
b) True

Explanation: If a ∈ R then f(a) = c
limx→a⁡f(x)=limx→a⁡c=c=f(a)
Hence, f(x) is continuous at any point a ∀ R.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. What are the kinds of discontinuity?
a) Minor and major kinds
b) Increment and decrement kinds
c) First and second kinds
d) Zero and one kinds

Explanation: Kinds of discontinuity are classified as follows.
i. Discontinuity of the first kind: Removable and jump discontinuities.
ii. Discontinuity of the second kind: Oscillating and infinite discontinuities.

7. Is f(x) = $$\begin{cases} \frac {sin2x}{x} & if \, x \neq 0 \\ 1 & if \, x = 0 \\ \end{cases}$$ a continuous function?
a) Only in some cases
b) Cannot be determined
c) Continuous
d) Not continuous

Explanation: limx→0⁡f(x)=limx→0⁡⁡$$\frac {sin2x}{x}$$ x 2
= 1 x 2
= 2 ≠ f(0)
Hence, given function is not continuous at x = 0

8. What is/are conditions for a function to be continuous on (a,b)?
a) The function is continuous at each point of (a,b)
b) The function is right continuous
c) The function is left continuous
d) Right continuous, left continuous, continuous at each point of (a,b)

Explanation: The three conditions required for a function f is said to be continuous on (a,b) if f is continuous at each point of (a,b), f is right continuous at x = a, f is left continuous at x = b.

9. limx→a+⁡f(x)=f(a) then f(x) is right continuous at x = a.
a) True
b) False

Explanation: A function is said to be continuous when it is both left continuous and right continuous. Mathematical expression for a function f is left continuous on (a,b) is limx→a⁡+f(x)=f(a).

10. limx→a⁡-f(x)=f(b) then f(x) is left continuous at x = a.
a) False
b) True

Explanation: A function is said to be continuous when it is both left continuous and right continuous. Mathematical expression for a function f is left continuous on (a,b) is limx→a-⁡f(x)=f(a).

More MCQs on Class 12 Maths Chapter 5:

To practice all chapters and topics of class 12 Mathematics, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]