1
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
$\frac{1}{5}$
2
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
$2 \mathrm{~ms}^{-2}$
3
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
$R=r$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Emission of electrons from a metal plate illuminated with monochromatic electromagnetic radiation will always take place provided
A
The plate is positively charged
B
The plate is negatively charged
C
The radiation is sufficiently intense
D
The work function of the plate is less than the energy of a single photon and the plate is uncharged
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