Atoms MCQs with Answers

A proton consists of quarks which are _?

• A.Two up, one down
• B.Two down, one up
• C.One up, one down, one strange
• D.Three up

Which type of radiation among alpha, beta, and gamma particles has no electric charge?

• A.Alpha particles
• B.Beta particles
• C.Gamma particles
• D.Both alpha and beta particles

If we have "No" number of any radioactive element then after a period of "n" half-lives the number of atoms left behind is?

• A.(1/2)^n No
• B.(1/n)^2 No
• C.(2)^n No
• D.n × (1/2) No

Mass of meson is?

• A.Equal to proton
• B.Less than proton
• C.Greater than proton
• D.Equal to electron

For an electronic state s = 1, and l = 1, the number of possible values of total angular momentum of an electron are _?

• A.1
• B.2
• C.3
• D.4

When a nucleus emits beta particles, the parent and daughter nuclei are ?

• A.Isotopes
• B.Isomers
• C.Isotones
• D.Isobars

The antiparticle of electron is _?

• A.Proton
• B.Neutron
• C.Positron
• D.Neutrino

What is formed when the nucleus breaks apart during nuclear fission?

• A.Two smaller atoms
• B.A single heavier atom
• C.Only neutrons and gamma rays
• D.A plasma state of the same atom

The Pauli's exclusion principle is obeyed by ?

• A.All particles with spin quantum numbers of 1/2
• B.All particles with integer spin quantum numbers
• C.All particles with zero spin quantum numbers
• D.All particles regardless of spin quantum numbers

Is a fission reaction classified as a chemical reaction?

• A.Yes
• B.No
• C.Only in the presence of a catalyst
• D.Only at high temperatures