1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Consider the function $$f(x) = - 2{x^3} - 9{x^2} - 12x + 1$$
The function f(x) is a decreasing function in the interval
A
($$-$$2, $$-$$1)
B
($$-$$ $$\infty$$, $$-$$2)
C
($$-$$1, $$\infty$$)
D
($$-$$ $$\infty$$, $$-$$2) $$\cup$$ ($$-$$ 1, $$\infty$$)
2
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following statements is correct in respect of the function f(x) = x3 sin x?
A
It has local maximum at x = 0
B
It has local minimum at x = 0
C
It has neither maximum nor minimum at x = 0
D
It has maximum value 1
3
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Let $$f(x) = \left\{ {\matrix{ {3{x^2} + 12x - 1,} & { - 1 \le x \le 2} \cr {37 - x,} & {2 < x \le 3} \cr } } \right.$$
Which of the following statements is/are correct?

I. f(x) is increasing in the interval {$$-$$1, 2}.

II. f(x) is decreasing in the interval {2, 3}.

Select the correct answer using the code given below.
A
Only I
B
Only II
C
Both I and II
D
Neither I nor II
4
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Let $$f(x) = \left\{ {\matrix{ {3{x^2} + 12x - 1,} & { - 1 \le x \le 2} \cr {37 - x,} & {2 < x \le 3} \cr } } \right.$$
Which of the following statements are correct?

I. f(x) is continuous at x = 2.

II. f(x) attains greatest value at x = 2.

III. f(x) is differentiable at x = 2.

Select the correct answer using the code given below.
A
I and II
B
II and III
C
I and III
D
I, II and III
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