1
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
$4 \tau+3, \quad \frac{4 \tau^2+3 \tau}{R}$
2
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
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Point charges $-3 Q,-q, 2 q$ and $2 Q$ are placed, one at each corner of a square. The relation between Q and q for which the potential at the centre of the square is zero is
A
$Q=\frac{1}{q}$
B
$Q=-q$
C
$Q=\frac{-1}{q}$
D
$Q=q$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
If $R$ and $L$ denote resistance and inductance of a material, then the dimension of $L R$ will be:
A
$M^2 L^4 T^{-5} A^{-4}$
B
$M L T A^{-1}$
C
$M^0 L^0 T^0 A^0$
D
$M^{-1} L^4 T A^{-3}$
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