AP EAPCET (Engineering) Nuclei — practice questions
70 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice AP EAPCET (Engineering) Nuclei in the app →By roughly what factor is a nucleus's radius smaller than an atom's?The volume of a nucleus is about what fraction of the atom's volume?What share of an atom's mass is held in its nucleus?One atomic mass unit is defined as what?What is the value of one atomic mass unit in kilograms?Chlorine has isotopes of 34.98 u (75.4%) and 36.98 u (24.6%). What is its average atomic mass?The word isotope comes from Greek for what?Why is tritium produced artificially in laboratories?What is the mass of a proton in atomic mass units?Who discovered the neutron in 1932?Chadwick found neutrons by bombarding which element with alpha particles?In which year did Chadwick receive the Nobel Prize for discovering the neutron?About how long is the mean life of a free neutron?A free neutron decays into which set of particles?How many neutrons are in a gold-197 nucleus with atomic number 79?Mercury-198 (Z = 80) and gold-197 (Z = 79) are an example of what?Why do isotopes of an element behave identically in chemistry?How close did a 5.5 MeV alpha particle get to a gold nucleus?Accurate nuclear sizes were measured by scattering which projectiles?In R = R0 A^(1/3) for nuclear radius, what is R0?How does nuclear density vary with mass number A?Approximately what is the density of nuclear matter?What is the ratio of nuclear radii for mass numbers 125 and 27?Matter in which astronomical object has density comparable to a nucleus?If 1 g of matter is fully converted to energy, how much energy results?One atomic mass unit is equivalent to how much energy?How does a nucleus's mass compare with the total mass of its free nucleons?What is the mass defect of the oxygen-16 nucleus?Oxygen-16 has a binding energy of 127.5 MeV. What is its binding energy per nucleon?Binding energy per nucleon peaks at about 8.75 MeV near which mass number?About what is the binding energy per nucleon for A = 238?For which nuclei is binding energy per nucleon lower than the middle range?Which correctly orders the forces from strongest to weakest?How does the nuclear force between two nucleons behave below about 0.8 fm?How does the nuclear force depend on the charge of the nucleons?Beyond what separation does the nuclear force fall almost to zero?Becquerel first saw radioactivity using which compound?Which particles are emitted in beta decay?What is emitted in gamma decay?Fission of 1 kg of uranium yields about how much energy?Nuclear process energies are roughly how many times chemical ones?About how much energy is released per uranium nucleus that fissions?An A = 240 nucleus (7.6 MeV per nucleon) splits into two A = 120 nuclei (8.5 MeV). Energy released?U-235 captures a neutron and splits into Ba-144 and Kr-89. How many neutrons are freed?How do fission fragments reach stable end products?What is the energy source in nuclear power reactors?In the first step of the sun's proton-proton cycle, two protons form what?About how high is the Coulomb barrier for two protons to fuse?Average protons would cross the fusion barrier at about what temperature?When its hydrogen runs out, the sun's outer envelope will expand into what?Peaks in binding energy per nucleon at He-4 and O-16 suggest what?When an electron meets a positron, they annihilate into what?What is the SI unit of the activity of a radioactive sample?A free neutron decays into a proton, an electron and which particle?Chadwick won the 1935 Nobel Prize in Physics for discovering what?What common term covers both protons and neutrons in a nucleus?Nuclei with the same mass number A but different Z are called what?How many neutrons are in a nucleus of gold-197 (Z = 79)?A deuterium nucleus contains how many protons and neutrons?Nucleus X has A = 125 and nucleus Y has A = 8. What is the ratio of radius X to radius Y?Why do very fast alpha particles deviate from Rutherford scattering?How much energy is released if 1 g of matter is fully converted to energy?The energy needed to split a nucleus into its nucleons is called what?Binding energy per nucleon equals the binding energy divided by what?For which range of A is binding energy per nucleon nearly constant?Among nuclear, Coulomb and gravitational forces, which is the weakest?The nuclear force between two nucleons is attractive beyond roughly what separation?Which decay emits electrons or positrons from the nucleus?Gamma decay involves emission of what?Alpha particles were proved to be what?