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Published on: 23/05/2021
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Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
In fusion reaction occurring in the sun,
hydrogen is converted into carbon
hydrogen and helium are converted into carbon and other heavier metals/elements
helium is converted into hydrogen
hydrogen is converted into helium
2.
In a nuclear reactor, moderators slow down the neutrons which come out in a fission process. The moderator used have light nuclei. Heavy nuclei will not serve the purpose, because
they will break up
elastic collision of neutrons with heavy nuclei will not slow them down
the net weight of the reactor would be unbearably high
substances with heavy nuclei do not occur in liquid or gaseous state at room temperature
3.
When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom
do not change for any type of radioactivity
change for a and β-radioactivity but not for γ-radioactivity
change for a-radioactivity but not for others
change for β-radioactivity but not for others
4.
The gravitational force between a H-atom and another particle' of mass m will be given by Newton's law \(F=G \frac{M m}{r^{2}}\), where r is in km
Gravitational mass of H-atom
Effective mass of H-atom
Nuclear mass of H-atom
Mass of electrons in H-atom
5.
O2 molecule consists of two oxygen atoms.In the molecule, nuclear force between the nuclei of the two atoms
is not important because nuclear forces are short-ranged
is as important as electrostatic force for binding the two atoms
cancels the repulsive electrostatic force between the nuclei
is not important because oxygen nucleus have equal number of neutrons and protons.
1.
(d)
hydrogen is converted into helium
2.
(b)
elastic collision of neutrons with heavy nuclei will not slow them down
3.
(b)
change for a and β-radioactivity but not for γ-radioactivity
4.
(b)
Effective mass of H-atom
5.
(a)
is not important because nuclear forces are short-ranged
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