1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let f(x) be defined as follows

$$f(x) = \left\{ {\matrix{ {2x + 1,} & { - 3 < x < - 2} \cr {x - 1,} & { - 2 \le x < 0} \cr {x + 2,} & {0 \le x < 1} \cr } } \right.$$

Which one of the following statements is correct in respect of the above function?
A
It is discontinuous at x = $$-$$2 but continuous at every other point.
B
It is continuous only in the interval ($$-$$3, $$-$$2)
C
It is discontinuous at x = 0 but continuous at every other point.
D
It is discontinuous at every point
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the following statements

1. If $$\mathop {\lim }\limits_{x \to a} f(x)$$ and $$\mathop {\lim }\limits_{x \to a} g(x)$$ both exist, then $$\mathop {\lim }\limits_{x \to a} \{ f(x)g(x)\} $$ exists.

2. If $$\mathop {\lim }\limits_{x \to a} \{ f(x)g(x)\} $$ exists, then both $$\mathop {\lim }\limits_{x \to a} f(x)$$ and $$\mathop {\lim }\limits_{x \to a} g(x)$$ must exist.

Which of the above statement is/are correct?
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
3
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the function $$f(x) = \left\{ {\matrix{ {{{\sin 2x} \over {5x}},} & {if\,x \ne 0} \cr {{2 \over {15}},} & {if\,x = 0} \cr } } \right.$$

Which one of the following is correct in respect of the function?
A
It is not continuous at x = 0
B
It is continuous at every x
C
It is not continuous at x = $$\pi$$
D
It is continuous at x = 0
4
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
For the function f(x) = | x $$-$$ 3 |, which one of the following is not correct?
A
The function is not continuous at x = $$-$$3
B
The function is continuous at x = 3
C
The function is differentiable ta x = 0
D
The function is differentiable at x = $$-$$3
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