1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$f(x) = {{{x^2} - 9} \over {{x^2} - 2x - 3}},x \ne 3$$ is continuous at x = 3, then which one of the following is correct?
A
f(3) = 0
B
f(3) = 1.5
C
f(3) = 3
D
f(3) = $$-$$1.5
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\mathop {\lim }\limits_{x \to 0} {{\tan x} \over {\sin 2x}}$$ equal to
A
$${1 \over 2}$$
B
1
C
2
D
Limit does not exist
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\mathop {\lim }\limits_{h \to 0} {{\sqrt {2x + 3h} - \sqrt {2x} } \over {2h}}$$ equal to ?
A
$${1 \over {2\sqrt {2x} }}$$
B
$${1 \over {\sqrt {2x} }}$$
C
$${3 \over {2\sqrt {2x} }}$$
D
$${3 \over {4\sqrt {2x} }}$$
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
For what value of k is the function $$f(x) = \left\{ \matrix{ 2x + {1 \over 4},x < 0 \hfill \cr k,x = 0 \hfill \cr {\left( {x + {1 \over 2}} \right)^2},x > 0 \hfill \cr} \right.$$ continuous?
A
$${1 \over 4}$$
B
$${1 \over 2}$$
C
1
D
2
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