1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A bomb of mass 20 kg at rest explodes into two pieces of masses 12 kg and 8 kg . If the velocity of 8 kg mass is $6 \mathrm{~ms}^{-1}$, then the kinetic energy of the other mass is:
A
144 J
B
64 J
C
86 J
D
96 J
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two identical conducting balls having positive charges $q_1$ and $q_2$ are separated by a distance $r$. If they are made to touch each other and then separated to the same distance, the force between them will be
A
Same as before
B
zero
C
Less than before
D
More than before
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two simple harmonic motions are represented by equations $y_1=0.5 \sin \left[200 \pi \mathrm{t}+\frac{\pi}{3}\right]$ and $y_1=0.5 \cos \pi \mathrm{t}$. The phase difference of the velocity of particle 1 with respect to the velocity of particle 2 is :
A
$\frac{\pi}{2}$
B
$\frac{\pi}{6}$
C
$\frac{-\pi}{6}$
D
$\frac{-\pi}{2}$
4
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
$1: 3$
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