1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A bulb of resistance 280 Ohm is supplied with a voltage $\mathrm{V}=400 \sin \pi \mathrm{t}$. The peak current is
A
2.22 A
B
2.02 A
C
1.11 A
D
1.43 A
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A wooden block floats with $\frac{3}{5}$ of its volume submerged in a tank of water. If a denser liquid is poured into the tank, the wooden block floats with half its volume in the liquid and the remaining half in water. The relative density of the liquid is:
A
$\frac{1}{2}$
B
$\frac{1}{3}$
C
$\frac{1}{6}$
D
$\frac{1}{5}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A particle starts from rest and moves along the x -axis with a velocity that varies as $\mathrm{v}=\sqrt{100+4 x} \mathrm{~ms}^{-1}$. The acceleration of the particle is:
A
$25 \mathrm{~ms}^{-2}$
B
$5 \mathrm{~ms}^{-2}$
C
$4 \mathrm{~ms}^{-2}$
D
$2 \mathrm{~ms}^{-2}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
One surface of a lens is convex and the other is concave. If the radii of curvatures are $R$ and $r$ respectively, the lens will be convex if
A
$R >r$
B
$R< r$
C
$R=\frac{1}{r}$
D
$R=r$
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