1
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
$R_C< R_B< R_A$
2
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
$\frac{\pi}{2}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The magnetic flux $\phi$ through a stationary loop of wire having a resistance R varies with time as $\phi=4 t^2+3 t$. The average emf and total charge flowing in the loop in the time interval $t=0$ to $t=\tau$ respectively are
A
$\tau+3, \quad \frac{4 \tau^2+3 \tau}{R}$
B
$3 \tau+4, \quad \frac{4 \tau^2+3 \tau}{R}$
C
$4 \tau+3, \quad \frac{4 r+3}{R}$
D
$4 \tau+3, \quad \frac{4 \tau^2+3 \tau}{R}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A stone is dropped from a height $h$. It hits the ground with a certain momentum ' $p$ '. If the same stone is dropped from a different height h ' such that percentage change in momentum is $41.4 \%$, then the height from which the stone is dropped is $\mathrm{h}^{\prime}=x \mathrm{~h}$, where $x$ is:
A
4
B
2
C
6
D
3
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