NEET Physics Mass Energy Equivalence and Nuclear Reactions MCQs Set A

Question. When the number of nucleons in nuclei increases, the binding energy per nucleon
(a) first increases and then decreases with increase of mass number
(b) remains constant with mass number
(c) decreases continuously with mass number
(d) increases continuously with mass number

Answer: A

Question. The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into
(a) energy which binds nucleons together
(b) electrical energy
(c) light energy
(d) heat energy

Answer: A

Question. Nuclear forces are
(a) spin dependent and have a non-central part
(b) spin independent and have no non-central part
(c) spin dependent and have no non-central part
(d) spin independent and have a non-central part

Answer: A

Question. Fusion reaction occurs at temperatures of the order of
(a) 107 K
(b) 10 K
(c) 103 K
(d) 104 K

Answer: A

Question. If 1 mg of U235 is completely annihilated, the energy liberated is
(a) 9 × 1010 J
(b) 9 × 1019 J
(c) 9 × 1017 J
(d) Nonwe of these

Answer: A

Question. Control rods used in nuclear reactors are made of
(a) cadmium
(b) graphite
(c) plutonium
(d) stainless steel

Answer: A

Question. Which of the following statement is not true regarding Einsteins mass energy relation?
(a) Mass and energy can never be related to each other
(b) Mass and energy are two different forms of the same entity.
(c) Energy disappears to reappear as mass
(d) Mass disappears to reappear as energy

Answer: A

Question. The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
(a) is very stable
(b) can be used as fissionable meterial
(c) is radioactive
(d) can easily be broken up

Answer: A

Question. Calculate the binding energy of a deuteron atom, which consist of a proton and a neutron, given that the atomic mass of the deutron is 2.014102 u.
(a) 2.224 MeV
(b) 2.014102 MeV
(c) 0.002388 MeV
(d) 2.16490 MeV

Answer: A

Question. On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively
(a) 2.5 and 2 MeV
(b) 2.5 and 2 keV
(c) 3 and l keV
(d) 2 and 2 keV

Answer: A

Question. A moderator is used in nuclear reactors in order to
(a) decrease the number of neutrons
(b) increase the number of neutrons
(c) acceleerate the neutrons
(d) slow down the speed of the nuetrons

Answer: A

Question. Fusion reactions take place at high temperature because
(a) kinetic enrgy is high enough to overcome repulsion between nuclei
(b) nuclei break up at high temperature
(c) molecules break up at high temperature
(d) atoms are ionised at high temperature

Answer: A

Question. For a nuclear fusion process, suitable nuclei are
(a) lighter nuclei
(b) nuclei lying in the middle of periodic table
(c) heavy nuclei
(d) any nuclei

Answer: A

Question. If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is [Mass of He nucleus is 4.0026 amu and mass of Oxygen nucleus is 15.9994 amu]
(a) 10.24 MeV
(b) 7.6 MeV
(c) 56.12 MeV
(d) 23.9 MeV

Answer: A