1
WB JEE 2026
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The least positive value of ' $a$ ' for which the equation $\int_0^x\left(t^2-8 t+13\right) d t=x \sin \frac{a}{x}$ has a solution is

A

$3 \pi$

B

$4 \pi$

C

$\pi$

D

$2 \pi$

2
WB JEE 2026
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Let all the points on the curve $x^2+y^2-10 x=0$ are reflected about the line $y=x+3$. If the locus of the reflected points is in the form $x^2+y^2+g x+f y+c=0$, then the value of $(g+f+c)$ is

A

38

B

-28

C

28

D

-38

3
WB JEE 2026
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The equation $|x+1|^{\log _{(x+1)}\left(3+2 x-x^2\right)}=(x-3)|x|$ has

A

no solution

B

two solutions

C

unique solution

D

infinite no. of solutions

4
WB JEE 2026
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If the domain of $f(x)$ is $(0,1)$, then the domain of $y=f\left(e^x\right)+f(\ln |x|)$ is

A

$\left(-1,-\frac{1}{\mathrm{e}}\right)$

B

$\left(\frac{1}{\mathrm{e}}, 1\right)$

C

$(-\mathrm{e},-1)$

D

$(-e,-1) \cup(1, e)$