1
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1

Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atoms, respectively. According to the Bohr's model of an atom, the ratio T1 : T2 is

A
1 : 4
B
4 : 1
C
4 : 9
D
9 : 4
2
NEET 2022 Phase 1
MCQ (Single Correct Answer)
+4
-1

A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is

A
1 : 1
B
4 : 5
C
5 : 4
D
25 : 16
3
NEET 2021
MCQ (Single Correct Answer)
+4
-1
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding per nucleon of unfragmented nuclei is 7.6MeV while that of fragments is 8.5MeV. The total gain in the Binding Energy in the process is :
A
216MeV
B
0.9MeV
C
9.4MeV
D
804MeV
4
NEET 2021
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The half life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be :
A
$${2 \over {3\sqrt 2 }}$$
B
$${1 \over 2}$$
C
$${1 \over {2\sqrt 2 }}$$
D
$${2 \over 3}$$
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