1
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
For x $$ \in $$ (0, 3/2), let f(x) = $$\sqrt x $$ , g(x) = tan x and h(x) = $${{1 - {x^2}} \over {1 + {x^2}}}$$. If $$\phi $$ (x) = ((hof)og)(x), then $$\phi \left( {{\pi \over 3}} \right)$$ is equal to :
A
$$\tan {{7\pi } \over {12}}$$
B
$$\tan {{11\pi } \over {12}}$$
C
$$\tan {\pi \over {12}}$$
D
$$\tan {{5\pi } \over {12}}$$
2
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Let f(x) = x2 , x $$ \in $$ R. For any A $$ \subseteq $$ R, define g (A) = { x $$ \in $$ R : f(x) $$ \in $$ A}. If S = [0,4], then which one of the following statements is not true ?
A
g(f(S)) $$ \ne $$ S
B
f(g(S)) = S
C
f(g(S)) $$ \ne $$ f(S)
D
g(f(S)) = g(S)
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Let f(x) = ex – x and g(x) = x2 – x, $$\forall $$ x $$ \in $$ R. Then the set of all x $$ \in $$ R, where the function h(x) = (fog) (x) is increasing, is :
A
[0, $$\infty $$)
B
$$\left[ { - 1, - {1 \over 2}} \right] \cup \left[ {{1 \over 2},\infty } \right)$$
C
$$\left[ { - {1 \over 2},0} \right] \cup \left[ {1,\infty } \right)$$
D
$$\left[ {0,{1 \over 2}} \right] \cup \left[ {1,\infty } \right)$$
4
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
The domain of the definition of the function

$$f(x) = {1 \over {4 - {x^2}}} + {\log _{10}}({x^3} - x)$$ is
A
(-1, 0) $$ \cup $$ (1, 2) $$ \cup $$ (2, $$\infty $$)
B
(-2, -1) $$ \cup $$ (-1,0) $$ \cup $$ (2, $$\infty $$)
C
(1, 2) $$ \cup $$ (2, $$\infty $$)
D
(-1, 0) $$ \cup $$ (1,2) $$ \cup $$ (3, $$\infty $$)
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