Chapter (2)- Atomic Structure (2) Models of Atom

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Q1. Which of the following properties of atom could be explained correctly by Thomson Model of atom? *

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Overall neutrality of atom.

Spectra of hydrogen atom.

Position of electrons, protons and neutrons in atom.

Stability of atom.

Q2. Arrange the following in terms of penetrating power. Alpha-rays, Beta-rays, Gamma-rays *

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Alpha > Beta > Gaama

Alpha < Beta < Gamma

Alpha < Gamma < Beta

Gamma > Alpha > Beta

Q3. Which of the rays are not deflected by the electric andmagnetic field ? *

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Alpha

Beta

Gamma

Both Alpha and Gamma

Q4. Rutherford’s experiment on the scattering of D -particles showed for the first time that the atom has : *

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Electron

Proton

Nucleus

Neutron

Q5. When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected. This is because - *

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The force of repulsion on the moving alpha particle is small

The force of attraction between alpha particle and oppositely charged electrons is very small

There is only one nucleus and large number of electrons

The nucleus occupies much smaller volume compared to the volume of the atom

Q6. Rutherford’s Alpha-particle dispersion experiment concludes - *

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All positive ions are deposited at small part

All negative ions are deposited at small part

Proton moves around the electron

Neutrons are charged particles.

Q7. The number of electrons in 19K39 - *

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None of the above

Q8. Which of the following does not contain number of neutrons equal to that of 18Ar40 - *

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19K41

21Sc43

21Sc40

20Ca42

Q9. Number of protons, neutrons and electrons in the element 89X231 are - *

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89, 89, 242

89, 142, 89

89, 71, 89

89, 231, 89

Q10. An element has atomic number 11 and mass number 24. What does the nucleus contain? *

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11 protons, 13 neutrons

11 protons, 13 neutrons, 13 electrons

13 protons, 11 neutrons

13 protons, 11 electrons

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