Class CBSE Class 12 Mathematics Continuity and Differentiability Q #1694
COMPETENCY BASED
APPLY
1 Marks 2026 AISSCE(Board Exam) MCQ SINGLE
The greatest integer function, $f(x)=[x]$ for $0
(A) At only one point
(B) At only two points
(C) At no point
(D) At three points

AI Tutor Explanation

Powered by Gemini

Detailed Solution

Step 1: Understanding the Function

The function given is $f(x) = [x]$, which is the greatest integer function. This function is defined as the greatest integer less than or equal to $x$.

Step 2: Identifying Points of Discontinuity

The greatest integer function $[x]$ is known to be discontinuous at every integer value of $x$. For any integer $n$, the left-hand limit is $n-1$ and the right-hand limit is $n$. Since the limits are not equal, the function is discontinuous at all integers.

Step 3: Analyzing the Interval

The given interval is $0 < x < 2$. Within this open interval, the only integer value present is $x = 1$.

Step 4: Conclusion

Since $x = 1$ is the only integer in the interval $(0, 2)$, the function $f(x) = [x]$ is discontinuous at exactly one point within this interval.

Final Answer: At only one point

AI generated content. Review strictly for academic accuracy.

Pedagogical Audit
Bloom's Analysis: This is an APPLY question because the student must apply the definition of continuity and the properties of the greatest integer function to a specific restricted domain.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the behavior of step functions and the conceptual definition of continuity at a point.
Syllabus Audit: In the context of CBSE Class 12, this is classified as COMPETENCY. It requires the student to identify discontinuities in a standard function within a specific interval, moving beyond rote memorization.