1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two light rays A and B travel from a medium into air at angles of incidence 15 degrees and 42 degrees respectively. In the medium, light travels 3 cm in 0.2 ns . Will there be total internal reflection? If so, which ray?
A
No
B
Yes, A
C
Yes, B
D
Yes, Both A and B
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An electric field $E=3 x^2 i N C^{-1}$ exists in a certain region of space. The potential difference between the origin and at $x=4 m, V_0-V_4$ is
A
$-$20 V
B
$-$40 V
C
$-$64 V
D
64 V
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A current loop consists of two identical semicircular parts each of radius $2 R$, one lying in the $x-y$ plane and the other in $x-z$ plane. If the current in the loop is I, the resultant magnetic field due to two semicircular parts at their common centre is
A
$\frac{\mu_o I}{4 R}$
B
$\frac{4 \mu_o I}{\sqrt{2} R}$
C
$\frac{\mu_o I}{\sqrt{2} R}$
D
$\frac{\mu_o I}{4 \sqrt{2} R}$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is not a characteristic of diamagnetism?
A
The material moves from a region of strong magnetic field to weak magnetic field.
B
The origin of diamagnetism is the spin of electrons.
C
Their magnetic susceptibility is small and negative.
D
Diamagnetic materials are repelled by bar magnets.
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