1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A particle moves towards west with a velocity of $10 \mathrm{~ms}^{-1}$. After 10s its direction changes towards south and it moves with the same velocity. The average acceleration of the particle is:
A
$2 \sqrt{2} m s^{-2} N E$
B
$\left(\frac{1}{\sqrt{2}}\right) m s^{-2} S E$
C
$2 m s^{-2} N E$
D
$\sqrt{2} m s^{-2} S E$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The electric and magnetic fields associated with an electromagnetic wave propagating along +z axis, can be represented by
A
$E=E_0 i, \quad B=B_0 j$
B
$E=E_0 i, \quad B=B_0 k$
C
$E=E_0 k, \quad B=B_0 j$
D
$E=E_0 j, \quad B=B_0 k$
3
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
$1: 4$
4
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
$7.62 ~m s^{-1}$
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