Atoms and Nuclei Test

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Atoms and Nuclei Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

In Geiger-Marsden experiment prediction was that

A
Some particles would be expected at 75°

B
All the particles would go through the foil with hardly any deflection

C
Some particles would be expected at 45°

D
All the particles would bounce from the foil at 180°

Solution

All the alpha particles were expected to pass through the gold foil with very little or no scattering, according to the JJ Thomson's "Plum pudding model".
Question 2
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Atomic mass unit (u) is defined as ________ of the mass of the carbon (¹²C) atom.

A
(1/16)^th

B
(1/14)^th

C
(1/12)^th

D
(1/10)^th

Solution

For standardization, a specific atomic nucleus (carbon-12) had to be chosen because the average mass of a nucleon depends on the count of the nucleons in the atomic nucleus due to mass defect. This is also why the mass of a proton or neutron by itself is more than (and not equal to) 1 u.
Question 3
1 / -0

All nuclides with same mass number A are called

A
Isoclines

B
Isotopes

C
Isobars

D
Isotones

Solution

These are the elements having same atomic number but different mass number. They have the same atomic number because the number of protons inside their nuclei remains the same. The difference in their mass number is due to the difference in their number of neutrons.
Question 4
1 / -0

If an electromagnetic radiation has an energy of 13.2 keV, then the radiation will belong to the region of

A
visible light

B
ultraviolet

C
infrared

D
X-ray
Question 5
1 / -0

The model that best explains the results of Geiger-Marsden experiment is

A
Bohr model

B
None of these

C
Rutherford model

D
Thomson model

Solution

Ernest Rutherford who was a former research student of JJ Thomson supervised the experiment carried by two of his students Hans Geiger and Ernst Marsden. Rutherford felt that there existed a nucleus at the centre of the atom having positive charge and thus proposed the Rutherford model.
Question 6
1 / -0

Nuclear mass M is found to be

A
Always equal to the total mass of its individual protons and neutrons

B
Always greater than total mass of its individual protons and neutrons

C
Always less than total mass of its individual protons and neutrons

D
Always equal to the total mass of its individual neutrons
Question 7
1 / -0

The ionisation energy of 10 times ionised sodium atom is

A
13.6 eV

B
1.36 eV

C
- 1645.6 eV

D
164.56 eV
Question 8
1 / -0

Consider α particles, β particles and γ rays, each having energy of 0.5 MeV. In the increasing order of penetrating power, the radiations are

A
α, β, γ

B
α, γ, β

C
β, γ, α

D
γ, β, α

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Atoms and Nuclei Test - 1

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Atoms and Nuclei Test - 1

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Question 1

Some particles would be expected at 75°

All the particles would go through the foil with hardly any deflection

Some particles would be expected at 45°

All the particles would bounce from the foil at 180°

Solution

Question 2

(1/16)th

(1/14)th

(1/12)th

(1/10)th

Solution

Question 3

Isoclines

Isotopes

Isobars

Isotones

Solution

Question 4

visible light

ultraviolet

infrared

X-ray

Question 5

Bohr model

None of these

Rutherford model

Thomson model

Solution

Question 6

Always equal to the total mass of its individual protons and neutrons

Always greater than total mass of its individual protons and neutrons

Always less than total mass of its individual protons and neutrons

Always equal to the total mass of its individual neutrons

Question 7

13.6 eV

1.36 eV

- 1645.6 eV

164.56 eV

Question 8

α, β, γ

α, γ, β

β, γ, α

γ, β, α

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(1/16)^th

(1/14)^th

(1/12)^th

(1/10)^th