1
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
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A sonometer string vibrates with a frequency of 400 Hz . When the length of the string is halved and the tension is altered, it begins to vibrate with a frequency of 200 Hz . The ratio of the new tension to the original tension in the string is:
A
$4: 1$
B
$16: 1$
C
$1: 4$
D
$1: 16$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
In an experiment to measure the density of the material of a sphere, an error of $2 \%$ occurred while measuring the radius of a sphere and an error of $3 \%$ occurred while measuring the mass of the sphere. What is the maximum percentage error in the measurement of density?
A
8
B
6
C
7
D
9
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The radius of earth is $R$ and acceleration due to gravity on its surface is $g$. The height at which the acceleration due to gravity becomes $\frac{g}{8}$ is:
A
$2 R$
B
$(2 \sqrt{2}-1) R$
C
$\sqrt{2} R$
D
$2 \sqrt{2} R$
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