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NEET UG Nuclei — practice questions

Explore 102 free Nuclei questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Nuclei questions and exercises with answers

Showing questions 1–30 of 102.

The atomic mass unit is defined as one twelfth of the mass of which atom?Read the answer and worked solution →Atomic species of the same element that differ in mass are called:Read the answer and worked solution →Nuclides with the same mass number A are called:Read the answer and worked solution →Nuclides with the same neutron number but different atomic number are called:Read the answer and worked solution →A proton or a neutron is referred to by which general term?Read the answer and worked solution →The nucleus of the lightest hydrogen atom is called the:Read the answer and worked solution →The difference between the mass of a nucleus and its constituents is called the:Read the answer and worked solution →The density of a nucleus is described as being independent of which quantity?Read the answer and worked solution →Different nuclei are compared to a drop of liquid having what property?Read the answer and worked solution →The radius of a nucleus is smaller than the radius of an atom by a factor of about:Read the answer and worked solution →In the flat middle region of the curve, the binding energy per nucleon is nearly:Read the answer and worked solution →How many types of radioactive decay are said to occur in nature?Read the answer and worked solution →In alpha decay, which nucleus is emitted?Read the answer and worked solution →Half-life is the time taken for the decay of what fraction of the initial nuclei?Read the answer and worked solution →Mean life is the time at which the number of nuclei falls to what fraction of its initial value?Read the answer and worked solution →Why must the nuclear binding force be much stronger than the Coulomb force?Read the answer and worked solution →A nucleus influencing only the nucleons close to it shows which property of the nuclear force?Read the answer and worked solution →When fusion is achieved by raising the temperature enough to overcome Coulomb repulsion, it is called:Read the answer and worked solution →Atoms of an element differing in mass are called:Read the answer and worked solution →How many isotopes does hydrogen have?Read the answer and worked solution →Which element is said to have 32 isotopes?Read the answer and worked solution →The nuclei of isotopes of one element contain the same number of:Read the answer and worked solution →The density of a nucleus is:Read the answer and worked solution →Nuclei are compared to a drop of:Read the answer and worked solution →The difference between a nucleus and its constituents in mass is the:Read the answer and worked solution →The mass defect is explained by whose equivalence of mass and energy?Read the answer and worked solution →The average energy needed to remove one nucleon is the binding energy:Read the answer and worked solution →The binding energy curve is flat between mass numbers:Read the answer and worked solution →Who discovered radioactivity, in 1896?Read the answer and worked solution →Becquerel made his discovery while studying:Read the answer and worked solution →

Worked practice questions

The atomic mass unit is defined as one twelfth of the mass of which atom?

  1. Carbon twelve
  2. Cobalt twelve
  3. Calcium twelve
  4. Caesium twelve
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Correct answer: A. Carbon twelve

1. Atomic masses need a reference standard to be quoted against. 2. That standard is one particular isotope. 3. The atomic mass unit is defined as one twelfth of the mass of the carbon twelve atom. 4. So the answer is carbon twelve. _Source: syllabus Physics Part II, Ch 13 'Nuclei'_

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Atomic species of the same element that differ in mass are called:

  1. Isomers
  2. Isotopes
  3. Isobars
  4. Isotones
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Correct answer: B. Isotopes

1. The three iso- terms are separated by what stays the same. 2. Here the element, and so the proton number, is unchanged. 3. Such atomic species of the same element differing in mass are called isotopes. 4. So the answer is isotopes. _Source: syllabus Physics Part II, Ch 13 'Nuclei'_

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Nuclides with the same mass number A are called:

  1. Isobars
  2. Isotopes
  3. Isotones
  4. Isomers
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Correct answer: A. Isobars

1. Mass number counts protons and neutrons together. 2. Different elements can share the same total. 3. All nuclides with same mass number A are called isobars. 4. So the answer is isobars. _Source: syllabus Physics Part II, Ch 13 'Nuclei'_

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