1
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The ratio of the energies of the electron in the hydrogen atom in the first and second excited states is
A
$9: 4$
B
$4: 1$
C
$8: 1$
D
$1: 8$
2
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the following nuclear reaction $X$ is

$$ { }_{13} \mathrm{Al}^{27}+{ }_2 \mathrm{He}^4 \longrightarrow{ }_0 n^1+X $$

A
${ }_{15} \mathrm{P}^{31}$
B
${ }_{14} \mathrm{Si}^{30}$
C
${ }_{15} \mathrm{P}^{30}$
D
${ }_{15} \mathrm{Si}^{31}$
3
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
Nuclear fission and fusion can be explained on the basis of
A
Einstein's theory of relativity
B
Einstein specific heat equation
C
Einstein mass-energy equation
D
Einstein photoelectric equation
4
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
If the ratio of electron and hole currents in a semiconductor is $7 / 4$ and the ratio of drift velocities of electrons and holes is $5 / 4$, then ratio of concentrations of electrons and holes will be
A
$5: 7$
B
$7: 5$
C
$5: 9$
D
$9: 5$
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