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15 Q) "Consider the following statements.
I. Atom bomb is based upon the principle of uncontrolled nuclear fusion.
II. Hydrogen bomb is based upon the principle of uncontrolled nuclear fusion.
III. Nuclear reactor is based upon the principle of uncontrolled nuclear fusion.
"Which of the statements given above is/are correct?
(a) I, II and III (b) I and III
(c) II and III (d) Only II"
17 Q) "Which one of the following statements about uranium is correct?
"(a) Uranium (U-235) is fissionable by thermal neutrons.
(b) Fast neutrons trigger the fission process in U-235.
(c) U-238 breaks up into fragments, when bombarded by slow neutrons.
(d) U-235 is an unstable isotope and undergoes spontaneous fission."