1
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
$R=r$
2
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
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A charged particle is released from rest in a region of space in which steady and uniform electric and magnetic fields are parallel to each other. The particle will move in a
A
Helix
B
Straight line
C
Cycloid
D
Circle
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
If E is the amplitude of the electric field of the waves starting from the slits in a double slit experiment and $\theta$ is the phase difference between the waves reaching a point on the screen, the ratio of the amplitude of the resultant electric field at that point on the screen to the amplitude at one of the slits is
A
$\cos (\theta)$
B
$2 \cos (\theta)$
C
$\cos \left(\frac{\theta}{2}\right)$
D
$2 \cos \left(\frac{\theta}{2}\right)$
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