1
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The activity of a radioactive sample is measured as N0 counts per minute at t = 0 and N0/e counts per minute at t = 5 minutes. The time (in minutes) at which the activity reduces to half its value is
A
$${\log _e}{2 \over 5}$$
B
$${5 \over {{{\log }_e}2}}$$
C
5log102
D
5loge 2
2
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
The mass of a $${}_3^7Li$$ Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of $${}_3^7Li$$ nucleus is nearly
A
46 MeV
B
5.6 MeV
C
3.9 MeV
D
23 MeV
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
The energy of a hydrogen atom in the ground state is $$-$$ 13.6 eV. The energy of a He+ ion in the first excited state will be
A
$$-$$ 13.6 eV
B
$$-$$ 27.2 eV
C
$$-$$ 54.4 eV
D
$$-$$ 6.8 eV
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
An alpha nucleus of energy $${1 \over 2}$$ mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to
A
$${1 \over {Ze}}$$
B
v2
C
$${1 \over m}$$
D
$${1 \over {{v_4}}}$$
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