1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
$$\alpha $$-particale consists of :
A
2 electrons, 2 protons and 2 neutrons
B
2 electrons and 4 protons only
C
2 protons only
D
2 protons and 2 neutrons only
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
The total energy of an electron in an atom in an orbit is –3.4 eV. Its kinetic and potential energies are, respectively.
A
3.4 eV, – 6.8 eV
B
3.4 eV, 3.4 eV
C
– 3.4 eV, – 3.4 eV
D
– 3.4 eV, – 6.8 eV
3
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
A
20
B
10
C
30
D
15
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
A
1 : 1
B
1 : -1
C
2 : -1
D
1 : -2
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Class 12