1
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
$1: 3$
2
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
$5 \%$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A vertical spring of spring constant $24 \mathrm{Nm}^{-1}$ is fixed on a table. A ball of mass 0.5 kg at a height 2 m above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance of 50 cm . The net work done in the process is:
A
6.5 J
B
10.5 J
C
12.5 J
D
9.5 J
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The resistance of a wire is 5 ohm at $25^{\circ} \mathrm{C}$ and 7 ohm at $100^{\circ} \mathrm{C}$. The resistance of the wire at $0^{\circ} \mathrm{C}$ is
A
$\frac{13}{3} \mathrm{ohm}$
B
$\frac{5}{3} \mathrm{ohm}$
C
$\frac{2}{3}$ ohm
D
0.1 ohm
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