NTSE MCQs 2 on "STRUCTURE OF THE ATOM"

These are MCQs 2 of "STRUCTURE OF THE ATOM" . Practice MCQs to check your knowledge for Entrance examination like NTSE etc.

1. When a gold foil is bombarded by a beam of α particle, only a few of them get deflected whereas most go straight undeflected. This is because

• The force of attraction exerted on α particles by the electrons is insufficient
• The volume of nucleus is much smaller than that of the atom
• The force of repulsion acting on the fast moving α particles is very small
• The neutrons have no effect on α particles

2. Which of the following statements does not belong to Bohr’s model?

• Energy of the electrons in the orbit is quantized
• The electrons in the orbit nearest to the nucleus is the lowest energy
• Electrons revolve around the nucleus in different orbits having fixed energies
• The electrons radiate energy during revolution due to force of attraction between nucleus and electrons

3. How many electrons, protons and neutrons are present in X⁺, if atomic number of X is 19 and its mass number is 39

• E=19, P=19, N= 20
• E=18, P=19, N= 20
• E=18, P=19, N= 19
• E=19, P=20, N= 20

4. Which of the following does not have 8 valence electrons:

• He
• Ne
• Ar
• Cl^-

5. Which of the following does not have one electron in its valance shell

• Na
• Li
• H
• Ca

6. The electronic configuration of Cl^- ion is:

• 2,8,7
• 2,8,8
• 2,8,6
• 2,8,8,1

7. Which of the following are isotopes: A=> ¹H₁, B=>²D₁,C=> ³T₁ ,D=>¹H₁⁺

• A,B,C
• A,B,D
• A,D
• A,C,D

8. Which of the following are isobars:A => ₁₈Ar⁴⁰, B => ₁₉K³⁹, C => ₂₀Ca⁴⁰, D =>₁₉[K⁺]³⁹

• B,D
• A,B
• A,C
• A,B,C

9. Cathode rays have :

• Charge only
• Mass only
• Charge as well as mass
• Neither charge nor mass

10. The number of valence electrons determines:

• Physical properties of elements
• Chemical properties of elements
• Both physical and chemical properties of elements
• Neither physical nor chemical properties of elements