1
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
$2 \cos \left(\frac{\theta}{2}\right)$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two coherent waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. The sum of maximum to minimum intensities is
A
$\left(I_1+I_2\right)$
B
$2\left(I_1+I_2\right)$
C
$2\left(\sqrt{I_1}+\sqrt{I_2}\right)^2$
D
$\left(I_1+I_2\right)^2$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. On applying identical reverse bias across these diodes,
A
The reverse current in Ge is lesser than that in Si .
B
The relative magnitudes of reverse currents cannot be determined from the given data.
C
The reverse current is identical in both cases.
D
The reverse current in Ge is larger than that in Si .
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A convex lens forms a real image of an object with magnification $m_1$. The lens is moved towards the object to obtain another real image of magnification $m_2$. The image distance is increased by $x$. The focal length of the lens is
A
$\left(\frac{m_2}{m_1}\right) x$
B
$\left(\frac{m_1}{m_2}\right) x$
C
$\frac{x}{m_2-m_1}$
D
$x\left(m_2-m_1\right)$
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