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1
TG EAPCET 2024 (Online) 9th May Morning Shift
MCQ (Single Correct Answer)
+1
-0
An element consists of a mixture of three isotopes $A, B$ and $C$ of masses $m_1, m_2$ and $m_3$, respectively. If the relative abundances of the three isotopes $A, B$ and $C$ are in the ratio $2: 3: 5$, the average mass of the element is
A
$0.2 m_1+0.3 m_2+0.5 m_3$
B
$2 m_1+3 m_2+5 m_3$
C
$0.4 m_1+0.6 m_2+m_3$
D
$4 m_1+6 m_2+10 m_3$
2
TS EAMCET 2023 (Online) 12th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $F_1$ and $F_2$ are the relative strengths of the gravitational and weak nuclear forces respectively, then $F_2 / F_1$ is nearly

A
100
B
$10^{39}$
C
$10^{13}$
D
$10^{26}$
3
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
$1: 8$
4
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
${ }_{15} \mathrm{Si}^{31}$
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