1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
According to Bohr's theory of hydrogen atom, the speed of the electron, its energy and radius of its orbit vary with the principal quantum number $n$, respectively as
A
$\frac{1}{n}, n^2, \frac{1}{n^2}$
B
$\frac{1}{n}, \frac{1}{n^2}, n^2$
C
$n, \frac{1}{n^2}, n^2$
D
$\frac{1}{n^2}, \frac{1}{n}, n^2$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A particle of mass $M$ at rest decays into masses $m_1$ and $m_2$ with non-zero velocities. The ratio of de Broglie wavelengths $\lambda_1$ and $\lambda_2$ of the particles is
A
$\frac{m_2}{m_1}$
B
$\frac{\sqrt{m_1}}{\sqrt{m_2}}$
C
$\frac{m_1}{m_2}$
D
$1: 1$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The nuclear forces

a. are central forces, independent of the spin of the nucleons.

b. have a short-range dominant over a distance of about a few fermi

c. are stronger being hundred times stronger than that of electromagnetic forces.

d. are independent of the nuclear charge.

Which of the above is not true?

A
c
B
a
C
b
D
d
4
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
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