MCQ
Magnetic meridian is:
- AA point.
- BA line along north$-$south.
- CA horizontal plane.
- ✓A vertical plane.
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$A.$ Atoms of each element emit characterstics spectrum.
$B.$ According to Bohr's Postulate, an electron in a hydrogen atom, revolves in a certain stationary orbit.
$C.$ The density of nuclear matter depends on the size of the nucleus.
$D.$ A free neutron is stable but a free proton decay is possible.
$E.$ Radioactivity is an indication of the instability of nuclei.
Choose the correct answer from the options given below
