1
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
$5 \%$
2
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
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Three bulbs of $$40 \mathrm{~W}, 60 \mathrm{~W}$$, and $$100 \mathrm{~W}$$ are arranged in series with a $$220 \mathrm{~V}$$ source. The maximum light is obtained from

A
40 W
B
60 W
C
All give the same light
D
100 W
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The resistance of a $$10 \mathrm{~m}$$ long wire is $$10 \Omega$$. Its length is increased by $$25 \%$$ by stretching the wire uniformly. The new resistance is

A
$$18.6 \Omega$$
B
$$15.6 \Omega$$
C
$$12.8 \Omega$$
D
$$14.9 \Omega$$
COMEDK Subjects
EXAM MAP