1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A student measures the terminal potential difference $V$ of a cell (emf $\varepsilon$ and internal resistance $r$ ) as a function of current I flowing through it, and draws V versus I graph. The slope and intercept of the graph respectively are
A
$-r,-\varepsilon$
B
$-r, \varepsilon$
C
$r,-\varepsilon$
D
$r, \varepsilon$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A galvanometer of resistance $50 \Omega$ is connected to a battery of 4 V along with a resistance of $3950 \Omega$ in series. A full-scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 10 divisions, the resistance in series should be equal to:
A
8950 ohm
B
11950 ohm
C
7000 ohm
D
6000 ohm
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two capacitors $\mathrm{C}_1$ and $\mathrm{C}_2$ are charged to 100 V and 120 V respectively. It is found that upon connecting them together in parallel, the potential on each one of them is zero. Therefore
A
$\mathrm{C}_1+3 \mathrm{C}_2=0$
B
$5 \mathrm{C}_1=3 \mathrm{C}_2$
C
$5 \mathrm{C}_1+6 \mathrm{C}_2=0$
D
$5 \mathrm{C}_1=6 \mathrm{C}_2$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two very long, straight, parallel wires carry steady currents I and 21 respectively. The distance between the wires is d . At a certain instant of time, a point charge $q$ is at a point equidistant from the two wires, in the plane of the wires. Its instantaneous velocity is v perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
A
$\frac{\mu_o I q v}{\pi d}$
B
zero
C
$\frac{2 \mu_o I q v}{\pi d}$
D
$\frac{\mu_o I q v}{2 \pi d}$
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