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1
KCET 2026
MCQ (Single Correct Answer)
+1
-0
An electron transition takes place from excited state to ground state in hydrogen atom, then
A
Its kinetic energy increases but potential energy and total energy decrease
B
Its kinetic energy, potential energy and total energy decrease
C
Kinetic energy decreases, potential energy increases but total energy remains same
D
Kinetic energy and total energy decrease but potential energy increases
2
KCET 2026
MCQ (Single Correct Answer)
+1
-0
Bohr's second postulate implies quantisation of
A
Charge of an electron
B
Energy of an electron
C
Angular momentum of electron
D
Radiated energy by an electron
3
KCET 2026
MCQ (Single Correct Answer)
+1
-0
The radius of first orbit in hydrogen atom is $5.3 \times 10^{-11}$ m. The kinetic energy $E_K$, potential energy $E_P$ and total energy $E_T$ of electron in first orbit are
A
$E_K = -13.6\text{ eV}, E_P = 27.2\text{ eV}, E_T = 13.6\text{ eV}$
B
$E_K = 13.6\text{ eV}, E_P = -27.2\text{ eV}, E_T = -13.6\text{ eV}$
C
$E_K = -27.2\text{ eV}, E_P = -13.6\text{ eV}, E_T = 13.6\text{ eV}$
D
$E_K = 13.6\text{ eV}, E_P = -6.8\text{ eV}, E_T = -13.6\text{ eV}$
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

If the radius of first Bohr orbit is $r$, then the radius of the second Bohr orbit will be

A
8 r
B
$4 r$
C
$2 \sqrt{2} r$
D
$2 r$
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