1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$F(x) = \sqrt {9 - {x^2}} $$, then what is $$\mathop {\lim }\limits_{x \to 1} {{F(x) - F(1)} \over {x - 1}}$$ equal to ?
A
$$ - {1 \over {4\sqrt 2 }}$$
B
$${1 \over 8}$$
C
$$ - {1 \over {2\sqrt 2 }}$$
D
$${1 \over {2\sqrt 2 }}$$
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let f(x + y) = f(x) f(y) for all x and y. Then, what is f'(5) equal to [where f' (x) is the derivative of f(x)]?
A
f(5)f'(0)
B
f(5) $$-$$f'(0)
C
f(5)f(0)
D
f(5) + f'(0)
3
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
4
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
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