Problem 15
Fusion bomb involves (a) explosion of TNT (b) combustion of oxygen (c) destruction of heavy nucleus into smaller nuclei (d) combination of lighter nuclei into bigger nucleus
Problem 17
If the mass defect of \(\mathrm{X}^{9}\) is \(0.090 \mathrm{amu}\), then the binding energy per nucleon is (1 amu = \(921.5 \mathrm{MeV}\) ) (a) \(83.0 \mathrm{MeV}\) (b) \(9.315 \mathrm{MeV}\) (c) \(8.38 \mathrm{MeV}\) (d) \(931.5 \mathrm{MeV}\)
Problem 18
\({ }_{27} \mathrm{Co}^{60}\) is radioactive because (a) it has high \(\mathrm{n} / \mathrm{p}\) ratio (b) it has high \(\mathrm{p} / \mathrm{n}\) ratio (c) its atomic number is high (d) none of these
Problem 19
A heavy element has atomic number \(\mathrm{X}\) and mass number Y. Correct relation between \(\mathrm{X}\) and \(\mathrm{Y}\) is (a) \(\mathrm{X}=\mathrm{Y}\) (b) \(\mathrm{X}>\mathrm{Y}\) (c) \(\mathrm{X}<\mathrm{Y}\) (d) \(\mathrm{X}=Z(1-\mathrm{Y})\)
Problem 20
Decay of \(_{92} \mathrm{U}^{235}\) is \(\ldots \ldots\) order reaction (a) first (b) second (c) third (d) zero
Problem 21
Order of radioactive disintegration reaction is (a) third (b) second (c) first (d) zero
Problem 22
In which radiation, mass number and atomic number will not change? (a) \(\alpha\) (b) \(\beta\) (c) \(\alpha\) and \(2 \beta\) (d) \(\gamma\)
Problem 24
The half lives of two radioactive nuclides \(\mathrm{A}\) and \(\mathrm{B}\) are 1 and 2 min respectively. Equal weights of \(A\) and \(B\) are taken separately and allowed to disintegrate for \(4 \mathrm{~min}\). What will be the ratio of weights of \(\mathrm{A}\) and \(\mathrm{B}\) disintegrated? (a) \(1: 2\) (b) \(1: 1\) (c) \(1: 3\) (d) \(5: 4\)
Problem 25
In the nuclear fusion \({ }_{1} \mathrm{H}^{2}+{ }_{1} \mathrm{H}^{2} \longrightarrow{ }_{2} \mathrm{He}^{4}\), the masses of \({ }_{1} \mathrm{H}^{2}\) and \({ }_{2} \mathrm{H}^{4}\) are \(2.014 \mathrm{~m}_{\mathrm{a}}\) and \(4.003 \mathrm{~m}_{\mathrm{u}}\) respectively. The energy released per atom of helium formed is ........ MeV (a) \(4.31\) (b) \(13.26\) (c) \(16.76\) (d) \(23.275\)
Problem 26
In successive emission of \(\beta\) and \(\alpha\) particles, how many \(\alpha\) and \(\beta\) particles should be emitted for the natural \(\left(4 n+1\right.\) series) conversion of \({ }_{94} \mathrm{Pu}^{241}\) to \({ }_{92} \mathrm{U}^{233}\) ? (a) \(2 \alpha, \beta\) (b) \(2 \alpha, 2 \beta\) (c) \(2 \alpha, 3 \beta\) (d) \(\alpha, 2 \beta\)
