1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Assume that a neutron breaks into a proton and an electron. The energy released during this process is : (mass of neutron $$ = 1.6725 \times {10^{ - 27}}kg,$$ mass of proton $$ = 1.6725 \times {10^{ - 27}}\,kg,$$ mass of electron $$ = 9 \times {10^{ - 31}}\,kg$$ ).
A
$$0.51$$ $$MeV$$
B
$$7.10\,MeV$$
C
$$6.30\,MeV$$
D
$$5.4\,MeV$$
2
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
A diatomic molecule is made of two masses $${m_1}$$ and $${m_2}$$ which are separated by a distance $$r.$$ If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by: ($$n$$ is an integer)
A
$${{{{\left( {{m_1} + {m_2}} \right)}^2}{n^2}{h^2}} \over {2m_1^2m_2^2{r^2}}}$$
B
$${{{n^2}{h^2}} \over {2\left( {{m_1} + {m_2}} \right){r^2}}}$$
C
$${{2{n^2}{h^2}} \over {\left( {{m_1} + {m_2}} \right){r^2}}}$$
D
$${{\left( {{m_1} + {m_2}} \right){n^2}{h^2}} \over {2{m_1}{m_2}{r^2}}}$$
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Energy required for the electron excitation in $$L{i^{ + + }}$$ from the first to the third Bohr orbit is :
A
$$36.3$$ $$eV$$
B
$$108.8$$ $$eV$$
C
$$122.4$$ $$eV$$
D
$$12.1$$ $$eV$$
4
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive substance is $$20$$ minutes. The approximate time interval $$\left( {{t_2} - {t_1}} \right)$$ between the time $${{t_2}}$$ when $${2 \over 3}$$ of it had decayed and time $${{t_1}}$$ when $${1 \over 3}$$ of it had decayed is :
A
$$14$$ min
B
$$20$$ min
C
$$28$$ min
D
$$7$$ min
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