1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An ideal inductor is connected across a capacitor. Oscillations of energy $K$ are set up in the circuit. The capacitor plates are slowly drawn apart such that the frequency of oscillations is quadrupled. The work done in the process is
A
15K
B
13K
C
zero
D
2K
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is 4D, the difference between the powers of the original lens and the cut lens is
A
zero
B
3D
C
D
D
2D
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Three identical conducting balls $\mathrm{A}, \mathrm{B}$ and C , each of mass m , are thrown upward at an angle $\Theta$ to the horizontal with an initial speed $v$ in a region of space that has a uniform electric field $E$ downward along with the gravitational field $g . A$ is positively charged, B is uncharged and C is negatively charged. Rank the ranges R of these three balls in increasing order.
A
$R_A< R_B< R_C$
B
$R_B< R_C< R_A$
C
$R_A=R_B< R_C$
D
$R_C< R_B< R_A$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
In a single slit Fraunhofer diffraction pattern obtained at normal incidence, at the angular position of the second diffraction minimum the phase difference (in radian) between the waves from the opposite edges of the slit is
A
$\pi$
B
zero
C
$2\pi$
D
$\frac{\pi}{2}$
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