Chapter 21

What is A in the following reaction? \({ }_{12} \mathrm{Mg}^{26}+{ }_{1} \mathrm{H}^{2} \longrightarrow{ }_{12} \mathrm{Mg}^{27}+\mathrm{A}\) (a) \({ }_{1} \mathrm{H}^{1}\) (b) \({ }_{0} \mathrm{n}^{1}\) (c) \({ }_{1} \mathrm{D}^{2}\) (d) \(\gamma\) rays

Which of the following is easily stopped by air? (a) uv rays (b) X-rays (c) \(\alpha\) rays (d) \(\gamma\) rays

\({ }_{90}^{232} \mathrm{Th} \longrightarrow{ }_{82}^{208} \mathrm{~Pb}\) The number of \(\alpha\) and \(\beta\) particle emitted during the above reaction is (a) \(8 \alpha\) and \(4 \beta\) (b) \(8 \alpha\) and \(16 \beta\) (c) \(4 \alpha\) and \(2 \beta\) (d) \(6 \alpha\) and \(4 \beta\)

Which one of the following statement is correct? (a) the end nuclide formed in thorium (4n) series is \({ }_{83} \mathrm{Bi}^{200}\) (b) \({ }_{7} \mathrm{~N}^{15}\) and \({ }_{8} \mathrm{O}^{16}\) are isobars (c) \({ }_{20} \mathrm{Ca}^{40}\) has magic number of protons and magic number of neutrons (d) The radius (R) of a nuclide of mass number \(\mathrm{A}\) is given by the equation \(\mathrm{R}=\mathrm{R}_{0}(\mathrm{~A})^{1 / 2}\left(\mathrm{R}_{0}=\mathrm{constant}\right)\)

Which one of the following radioisotopes is used in the treatment of blood cancer? (a) \(\mathrm{Co}^{62}\) (b) \(\mathrm{P}^{32}\) (c) \(\mathrm{Na}^{24}\) (d) \(I^{131}\)

The proper rays for radio carbon dating are (a) X-rays (b) IR rays (c) uv rays (d) Cosmic rays

Unstable substances exhibit higher radioactivity due to (a) high \(\mathrm{p} / \mathrm{n}\) ratio (b) low p/n ratio (c) \(\mathrm{p} / \mathrm{n}=1\) (d) both (a) and (b)

Atom bomb is based on the principle of (a) nuclear fusion (b) nuclear fission (c) nuclear transformation (d) carbon dating

The reactor used to convert stable form to fossile form is (a) Breeder reactor (b) atomic reactor (c) chemical reactor (d) nuclear reactor

The moderator used in nuclear reactors is (a) TEL (b) \(\mathrm{D}_{2} \mathrm{O}\) (c) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{R}-\mathrm{O}-\mathrm{R}\)