Functions Questions - JEE

If the logarithms of two distinct positive numbers are equal to the corresponding numbers, then the base of the logarithm belongs to the interval

Let $ f $ be an invertible function from $ R \to R $ satisfying the equation \[ f^3(x) - (x^3 + 2)f^2(x) + (2x^3 + 1)f(x) - x^3 = 0. \] Then the value of $ f'(8) \times (f^{-1})'(8) $ is:

Number of correct statements: I) $f,g:\mathbb{R}\to\mathbb{R}$ with $f(x)=x$ if rational, $0$ if irrational and $g(x)=0$ if rational, $x$ if irrational. Then $f-g$ is one-one and onto. II) $f(x)=\sin x+\cos ax$ is periodic only if $a$ is rational. III) If $f:A\to B$ and $g:B\to C$, $g\circ f:A\to C$ is one-one, then $f$ must be one-one.

Graph of $y=f(x)$ is given with $f(0)=3$, minimum at $x=1$, zero at $x=-1$ and $x=3$. Then graph of $y=\dfrac{-1}{|f(x)|}$ is best represented by:

If $f(y) = \frac{x+1}{x-1}$, then $f(y)$ is equal to

Given f : R → R be defined by $ f(x) = \dfrac{x}{1+x^2},\ x \in R $. Then f(x) ∈

Let $P(A)$ be defined as power set of set $A=\{1,2,3,\ldots,2025\}$. Let $R$ be a relation defined on $P(A)$ as $(B,C)\in R$ if $B$ is superset of $C$, then $R$ is

$f(x)=\left|x^2-x-6\right|/|x-3|$ at $x=3$. Which is true?

The range of the function f(\theta) = \sqrt{8\sin^2 \theta + 4\cos^2 \theta - 8\sin \theta\cos \theta} is -

Domain of definition of the function $f(x) = \dfrac{3}{4 - x^2} + \log_{10}(x^3 - x)$ is

A function $f: R \to R$ satisfies the equation $f(x)f(y) - f(xy) = x + y,\ \forall\ x, y \in R$ and $f(1) > 0$, then:

Which of the following is the graph of the curve $\sqrt{|y|}=x$?

If $f(x) = \dfrac{x^3+x-2}{x^3-1}$ and $g(x) = \dfrac{x^2+x+2}{x^2+x+1}$, then ($D_f$ represents domain and $R_f$ represents range of $f(x)$)

Let $f(x)$ and $g(x)$ are two functions defined from $R^+ \to R$ such that\[f(x) = \begin{cases} 1 - \sqrt{x}, & \text{if } x \text{ is rational} \\ x^2, & \text{if } x \text{ is irrational} \end{cases}\] and \[g(x) = \begin{cases} x, & \text{if } x \text{ is rational} \\ 1 - x, & \text{if } x \text{ is irrational} \end{cases}\]The composite function $f(g(x))$ is:

Consider the graph of $y = f(x)$ with key points $(-5,-1)$, $(-3,2)$, $(-1,1)$, $(0,3)$, $(2,3)$, $(5,-1)$ and a horizontal asymptote $y=2$. Find the number of solution(s) of $x$ satisfying $f(f(x)) = 2$.

Contrapositive of the statement, "If a number is divisible by 9, then it is divisible by 3" is

If $ A $ and $ B $ are two equivalence relations defined on set $ C $, then which of the following is always true?

If $f:[-1,1]\to[0,2]$ defined by $f(x)=1+x$, then $f^{-1}$ is

Let $f$ be an even periodic function with period 2, and $f(x) = x$ for $x \in [0, 1]$. Then $f(3.14)$ equals

If $f(x)=x^2+ax+3$ and $g(x)=x+b$, where $F(x)=\lim_{n\to\infty}\dfrac{f(x)+(x^2)^n g(x)}{1+(x^2)^n}$. If $F(x)$ is continuous at $x=1$ and $x=-1$, then find the value of $(a^2+b^2)$

The negation of $\sim s \vee (\sim r \wedge s)$ is equivalent to

If $ y = f(x) $ is onto and $ 1 , find the number of integers \([c]$ can take, i.e., find the value of $[c]_{\max}$.

Consider the statement: "P(n) : n2 − n + 41 is prime". Then which one of the following is true?

Given $ f(x) = \dfrac{2x}{x-1} $. Which of the following statements is correct?

If $f(\ln(1+|x|)) = (1 - \ln(1+|x|))^{\frac{1}{7}}$, then $f(f(\cos x))$ is equal to:

Which of the following is true regarding $p \to (q \to p)$?

Let P be the relation defined on the set of all real numbers such that $P = \{(a, b): \sec^2 a - \tan^2 b = 1\}$. Then P is

Given $p \rightarrow (\sim q \vee r) \equiv \sim p \wedge (\sim q \vee r)$. The truth table for $\sim(p \wedge q) \vee r$ is given. Which option correctly represents the equivalent statement?

Consider: Statement I: $(p \wedge \sim q) \wedge (\sim p \wedge q)$ is a fallacy. Statement II: $(p \to q) \leftrightarrow (\sim q \to \sim p)$ is a tautology. (1) Statement I is true; statement II is true; statement II is a correct explanation for statement I. (2) Statement I is true; statement II is true; statement II is not a correct explanation for statement I. (3) Statement I is true; statement II is false. (4) Statement I is false; statement II is true.

Let $S$ be a non-empty subset of $\mathbb{R}$. Consider the following statement: $P$: There is a rational number $x \in S$ such that $x > 0$. Which of the following statements is the negation of the statement $P$?

Consider the following two statements:Statement p: The value of sin 120° can be derived by taking $\theta = 240°$ in the equation $2\sin\dfrac{\theta}{2} = \sqrt{1+\sin\theta} - \sqrt{1-\sin\theta}$.Statement q: The angles A, B, C and D of any quadrilateral ABCD satisfy the equation $\cos\left(\dfrac{1}{2}(A+C)\right) + \cos\left(\dfrac{1}{2}(B+D)\right) = 0$Then the truth values of p and q are, respectively,

Set \(A = \{x : |x| R is

If $A \cup B = A \cup C$ and $A \cap B = A \cap C$, then which of the following is true?

Let $f(x) = (x+2)^2 - 2,\ x \geq -2$. If $g(x)$ is a function whose graph is reflection of the graph of $y = f(x)$ in the line $y = x$, then $g(x)$ is equal to:

The domain of $f(x) = \sqrt{\log\left|\frac{1}{\sin x}\right|}$ is

The range of the function $f(x) = x^2 + \dfrac{1}{x^2 + 1}$ is:

The range of the function $ f(x) = \sin^{-1}\!\left(\log_2 \dfrac{x^2}{2}\right) $ is:

If $ y = \dfrac{x^2 - x + c}{x^2 + x + c} $ and $ y \leq 1 - \dfrac{2}{1 - 2\sqrt{c}} = \dfrac{5}{3} $, find the value of $c$.

Contrapositive of the statement"If two numbers are not equal, then their squares are not equal." is:

Let $ R $ be a relation defined on $ \mathbb{Z} $ by $ (a,b) \in R \Rightarrow a - b = nm $ where $ m \in \mathbb{Z} $ and $ m \neq 0 $. Which of the following is true?

We have $f(x + y) = f(x) + f(y)$ for all $x, y \in \mathbb{R}$, $f(0) = 0$, $f(1) = 7$. Then $\displaystyle\sum_{r=1}^{n} f(r)$ equals:

Find all values of $f(x)$ for which $f(x) = x + \sqrt{x^2}$.

Given $\displaystyle\sum_{k=1}^{10} f(a+k) = 16(2^{10}-1)$, where $f(x+y) = f(x)f(y)$ for all $x, y \in \mathbb{N}$ and $f(1) = 2$. Find the value of $a$.

A function $f: R \to R$ satisfies the equation $f(x)f(y) - f(xy) = x + y$, $\forall\, x, y \in R$ and $f(1) > 0$, then:

A survey shows that 63% of the people watch a news channel whereas, 76% watch an entertainment channel at a particular time. If $x\%$ of the people watch both types of channels, then

Let f : R - {0} \to R be a function such that f (x) - 6f ( 1 ) = 35 - 5 . x 3x 2 If the lim x\to0 ( 1 \alphax + f (x)) = \beta; \alpha, \beta \in R , then \alpha + 2\beta is equal to

If g is the inverse of a function f and $f'(x) = \dfrac{1}{1+x^5}$, then $g'(x)$ is equal to

If roots of the equation $|x-1| = 2[x] - 3\{x\}$ is $x_i$, then find $\left[\dfrac{\sum x_i}{5}\right]$ here (where $[x]$ & $\{x\}$ denotes integral and fractional part of $x$)

If $f(x) = \dfrac{2^{2x}}{2^{2x}+2}$, $x \in \mathbb{R}$, then $f\!\left(\dfrac{1}{2023}\right) + f\!\left(\dfrac{2}{2023}\right) + \cdots + f\!\left(\dfrac{2022}{2023}\right)$ is equal to

Let R1 = {(p, pn) : p prime, n ≥0, pn ≤50} and R2 = {(p, pn) : p prime, n = 0 or 1} on {1, . . . , 50}. The number of elements in R1 −R2 is:

Functions Questions (992)