WB JEE 2023 | Functions Question 18 | Mathematics

WB JEE 2023

MCQ (Single Correct Answer)

-0.5

In the interval $$( - 2\pi ,0)$$, the function $$f(x) = \sin \left( {{1 \over {{x^3}}}} \right)$$.

never changes sign.

changes sign only once.

changes sign more than once but finitely many times.

changes sign infinitely many times.

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Domain of $$y = \sqrt {{{\log }_{10}}{{3x - {x^2}} \over 2}} $$ is

x < 1

2 < x

1 $$\le$$ x $$\le$$ 2

2 < x < 3

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Let $$f(x) = {(x - 2)^{17}}{(x + 5)^{24}}$$. Then

f does not have a critical point at x = 2

f has a minimum at x = 2

f has neither a maximum nor a minimum at x = 2

f has a minimum at x = 2

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

Let $$f(n) = {2^{n + 1}}$$, $$g(n) = 1 + (n + 1){2^n}$$ for all $$n \in N$$. Then

$$f(n) > g(n)$$

$$f(n) < g(n)$$

f(n) and g(n) are not comparable.

$$f(n) > g(n)$$ if n be even and $$f(n) < g(n)$$ if n be odd.

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