1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two spheres of masses $M_1$ and $M_2$ are in air separated by a distance of d m . The gravitational force of attraction between them is $F$. If the space around the masses is filled with a liquid of density $\rho$, the force between the masses will be

A

$\frac{F}{\rho}$

B

F

C

$\rho F$

D

Zero

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following is incorrect for displacement current

A. Displacement current exists only when electric field changes with time

B. Displacement current obeys ohm's law

C. Displacement current produces magnetic field just like conduction current

D. Unlike conduction current, displacement current does not involve the flow of electrons through a conductor

A

B

B

D

C

A

D

C

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a Young's double slit experiment, the slit separation is 1.5 mm . The setup is illuminated simultaneously by light of wavelengths $6000 \mathop {\rm{A}}\limits^{\rm{o}}$ and $8000 \mathop {\rm{A}}\limits^{\rm{o}}$. The screen is placed at a distance of 1.5 m from the slits. It is observed that at a certain point $P$ on the screen which is 4.8 mm from the central maximum, fringes due to both the wavelengths coincide.

Which of the following options are correct?

A. Light of wavelength $6000\mathop {\rm{A}}\limits^{\rm{o}}$ produces a dark fringe and light of wavelength $8000 \mathop {\rm{A}}\limits^{\rm{o}}$ produces a bright fringe at P

B. Light of wavelength $6000 \mathop {\rm{A}}\limits^{\rm{o}}$ produces a bright fringe and light of wavelength $8000 \mathop {\rm{A}}\limits^{\rm{o}}$ produces a dark fringe at P

C. Light of wavelength $6000\mathop {\rm{A}}\limits^{\rm{o}}$ and light of wavelength $8000 \mathop {\rm{A}}\limits^{\rm{o}}$ both produce a dark fringe at P

D. Light of wavelength $6000 \mathop {\rm{A}}\limits^{\rm{o}}$ and light of wavelength $8000\mathop {\rm{A}}\limits^{\rm{o}}$ both produce a bright fringe at P

A

B

B

D

C

A

D

C

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A small hollow vessel which has a small circular hole of radius $r$ in its base, is immersed in a tank of oil of density $\rho$ and surface tension $T$. The oil will penetrate into the vessel at a depth of

A

$\frac{2 T}{r \rho g}$

B

$\frac{T}{r \rho g}$

C

$\frac{4 T}{r \rho g}$

D

$$ \frac{2}{\operatorname{r} \rho g T} $$