1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A bar magnet is oscillating in the earth's magnetic field with a period $T$. When the length of the bar magnet is doubled and its mass is quadrupled, the time period is $T_1$. The ratio of $T_1$ to $T$ is
A
$1: 2$
B
$4: 1$
C
$2: 1$
D
$1: 4$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A cylindrical tank 0.5 m in radius, rests on a platform 1.5 m high. Initially the tank is filled with water to a height of 2.5 m . A small plug whose area is $10^{-4} \mathrm{~m}^2$ is removed from an orifice located on the side of the tank at the bottom. The speed with which the water strikes the ground is: [Assume $g=10 \mathrm{~ms}^{-2}$ ]
A
$7.07 \mathrm{~ms}^{-1}$
B
$5.1 ~m s^{-1}$
C
$5.47 \mathrm{~ms}^{-1}$
D
$7.62 ~m s^{-1}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A long solenoid has 400 turns. When a current of 100 A is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 mWb . The self-inductance of the solenoid is
A
1.6 mH
B
16 mH
C
16 H
D
0.16 mH
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is not true for a perfect conductor?
A
Electric field inside a conductor is zero
B
The electric field just outside a conductor is always perpendicular to the surface.
C
The surface of a conductor is an equipotential surface.
D
The charge carried by a conductor is always uniformly distributed over the surface of the conductor irrespective of the shape of the conductor.
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