1
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
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A single slit diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then

A
the diffraction pattern will disappear.
B
fringes will become narrower and crowded together.
C
fringes will become broader and will be further apart.
D
there is no change in the diffraction pattern.
2
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
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The variation of density of a solid cylindrical rod of cross sectional area $\alpha$ and length $L$ is $\rho=\rho_0 \frac{x^2}{L^2}$, where $x$ is the distance from one end of the rod. The position of its centre of mass from one end $(x=0)$ is

WB JEE 2025 Physics - Center of Mass Question 2 English

A
$\frac{2 L}{3}$
B
$\frac{L}{2}$
C
$\frac{L}{3}$
D
$\frac{3 L}{4}$
3
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

A simple pendulum is taken at a place where its distance from the earth's surface is equal to the radius of the earth. Calculate the time period of small oscillations if the length of the string is 4.0 m . (Take $g=\pi^2 \mathrm{~ms}^{-2}$ at the surface of the earth.)

A
4 s
B
6 s
C
8 s
D
2 s
4
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Consider a particle of mass 1 gm and charge 1.0 Coulomb is at rest. Now the particle is subjected to an electric field $E(t)=E_0 \sin \omega t$ in the $x$-direction, where $E_0=2$ Newton/Coulomb and $\omega=1000 \mathrm{rad} / \mathrm{sec}$. The maximum speed attained by the particle is

A
$2 \mathrm{~m} / \mathrm{sec}$
B
$4 \mathrm{~m} / \mathrm{sec}$
C
$6 \mathrm{~m} / \mathrm{sec}$
D
$8 \mathrm{~m} / \mathrm{sec}$
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