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Olympiad (Class 11) Physics — practice by topic

Browse 30 questions across 3 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Nuclei (30)Olympiad Physics (30)Physics (30)

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If an atom were blown up to the size of a classroom, the nucleus would be about as big as a:Read the answer and worked solution →Two atoms of one element have the same protons but different masses. They are:Read the answer and worked solution →The number of protons inside a nucleus is given by its:Read the answer and worked solution →The total number of protons and neutrons in a nucleus is called its:Read the answer and worked solution →

Worked practice questions

If an atom were blown up to the size of a classroom, the nucleus would be about as big as a:

  1. Pinhead
  2. Football
  3. Blackboard
  4. Schoolbag
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Correct answer: A. Pinhead

1. The nucleus is tiny compared with the whole atom. 2. Scaled to a classroom it shrinks to a speck. 3. That speck is the size of a pinhead. _Source: syllabus Physics Part II, Class XII, Chapter 13, Nuclei._

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Two atoms of one element have the same protons but different masses. They are:

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

1. Same element means the same proton count. 2. Different mass means a different neutron count. 3. Such atoms are isotopes. _Source: syllabus Physics Part II, Class XII, Chapter 13, Nuclei._

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The number of protons inside a nucleus is given by its:

  1. Atomic number
  2. Atomic weight
  3. Atomic radius
  4. Atomic volume
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Correct answer: A. Atomic number

1. Each symbol in the notation counts something. 2. The count of protons has its own name. 3. That name is the atomic number. _Source: syllabus Physics Part II, Class XII, Chapter 13, Nuclei._

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