1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
$$\alpha $$-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
Change Language
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
Change Language
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
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
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
NEET Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12