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 identical conductors of lengths 1 and 31 respectively are maintained at the same temperature. They are given potential differences in the ratio $1: 3$. The ratio of their drift velocities is
A
$1: 9$
B
$9: 1$
C
$1: 1$
D
$1: 3$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
If voltage across a bulb rated $220 \mathrm{~V}, 50 \mathrm{~W}$ drops by $5 \%$ of its rated value, the percentage of the rated value by which the power would decrease is
A
$10 \%$
B
$2.5 \%$
C
$15 \%$
D
$5 \%$
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