When the nucleus of an atom splits up into lighter nuclei through a nuclear reaction, it is called nuclear fission.
Nuclear fusion is a reaction through which two or more light nuclei collide into each other to form a heavier nucleus.
Q1: The splitting of a nucleus into smaller nuclei is
- gamma -radiation
Answer: (b) Fission
Q2: Name the moderator used in the nuclear reactor?
Answer: (c) Graphite
Q3: Which isotope of Uranium has the capacity to sustain the chain reaction?
Answer: (b) U-235
Q4: Which of the following atomic particles have the least mass?
Answer: (b) Electron
Q5: During an atomic explosion, the energy released is due to
- Conversion of protons to neutrons
- Conversion of chemical energy into heat energy
- Conversion of mechanical energy into nuclear energy
- Conversion of mass into energy
Answer: (d) Conversion of mass into energy
Q6: What is the beneficial aspect of nuclear fission?
- The ability to absorb energy
- The ability to produce more energy than nuclear fusion
- The ability to release tremendous amounts of energy
- There are no beneficial aspects of nuclear fission
Answer: (c) The ability to release tremendous amounts of energy
Q7: When a neutron leaves the nucleus, it’s mass
- Stays the same
Answer: (b) Decreases
Q8: The element with the least mass per nucleon is
Answer: (b) Iron
Q9: The release in energy in nuclear fission is consistent with the fact that uranium has
- More mass per nucleon than either of the two fragments
- Has more mass per nucleon as the two fragment
- Has exactly the same mass per nucleon as the two fragments
- Less mass per nucleon than either of the two fragments
Answer: (a) More mass per nucleon than either of the two fragments
Q10: The energy we get in nuclear reaction comes from
- Energy we put into the reactor
- The mass of the fuel
- The sun
Answer: (b) The mass of the fuel