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Atomic Structure (Class - IX)

Atomic Structure

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Questions

Question 1 Multiple Choice (Single Answer)

The term 'atom' was coined by

  1. Aristotle
  2. Democritus
  3. Dalton
  4. Bohr
Question 2 Multiple Choice (Single Answer)

Rutherford inferred which of the following when he observed that 1 in 100000 alpha-particles completely rebound on hitting the foil?

  1. Nucleus in atom is very small as compared to the total size.
  2. Nucleus is the centre of mass for an atom.
  3. Nucleus is positively charged.
  4. Positive charge of the atom occupies very little space.
Question 3 Multiple Choice (Single Answer)

According to Neil Bohr's model, how many electrons can be accomodated in the M-shell?

  1. 2
  2. 8
  3. 18
  4. 32
Question 4 Multiple Choice (Single Answer)

Which of the following is in accordance with the plum pudding model by J.J. Thomson?

  1. Atoms contain only electron.
  2. Electrons are stuck in a lump of positively charged material.
  3. Atoms are negatively charged.
  4. Protons and neutrons are stuck in a negatively charged lump.
Question 5 Multiple Choice (Single Answer)

Which of the following observations of Rutherford gold foil experiment leads to the inference that there is a large empty space in atom?

  1. 1 in 1000000 particles completely rebound on hitting the foil.
  2. Very few particles were deflected.
  3. Most of the alpha particles passed through the gold foil without getting deflected.
  4. Some particles suffered a small deflection.
Question 6 Multiple Choice (Single Answer)

In 1869, J.J. Thomson discovered electron. Which of the following was/were used in his experiment?

  1. Paraffin
  2. Alpha particles
  3. Canal rays
  4. Cathode rays
Question 7 Multiple Choice (Single Answer)

Krypton has atomic number 36 and has 48 neutrons. What is its mass number?

  1. 36
  2. 84
  3. 48
  4. 40
Question 8 Multiple Choice (Single Answer)

The atomic mass of boron is 10.811. It contains 5 electrons. How many neutrons are present in it?

  1. 5
  2. 6.811
  3. 6
  4. 5.811
Question 9 Multiple Choice (Single Answer)

The mass number of an element is 18. It contains 7 electrons. What is the atomic number of the element?

  1. 18
  2. 7
  3. 11
  4. 25
Question 10 Multiple Choice (Single Answer)

Which of the following is true about isobars?

  1. They occur at the same place in the periodic table.
  2. They have the same atomic mass.
  3. They have the same number of electrons.
  4. They are atoms of the same element.
Question 11 Multiple Choice (Single Answer)

K-shell and L-shell of an atom are fully saturated and the M-shell contains 6 electrons. Mass number of the element is 27. What is the atomic number of this element?

  1. 6
  2. 16
  3. 27
  4. 11
Question 12 Multiple Choice (Single Answer)

Which of the following is the heaviest subatomic particle?

  1. Electron
  2. Proton
  3. Neutron
  4. Photon
Question 13 Multiple Choice (Single Answer)

Geiger-Marsden experiment led to the discovery of

  1. electrons
  2. protons
  3. nucleus
  4. neutrons
Question 14 Multiple Choice (Single Answer)

Which of the following elements has the tendency to gain electrons?

  1. K
  2. Mg
  3. Br
  4. Fe
Question 15 Multiple Choice (Single Answer)

Which of the following was the main limitation of Rutherford's model of atom?

  1. Atom is positively charged.
  2. Atoms of the same element are similar in all aspects.
  3. Arrangement of electrons and protons was not clear.
  4. Nucleus and electrons are held together by electrostatic force.
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