Structure of the Atoms Test

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Structure of the Atoms Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

If Rutherford would have used $$\beta $$-particles instead of $$\alpha $$-particles in his Goldleaf experiment which of the following observation would definitely not have been made?

A
Get condensed or concentrated

B
Majority of $$\beta $$-particles passing unperfected through the foil

C
Very few $$\alpha $$-particles getting absorbed

D
Wave nature of electron

Solution

Beta particles are heavier as compared to alpha particles. So if Rutherford's alpha particle experiment was done with beta particles the results would not have been the same. Not much deviation would have occurred and the proper theory related to the structure of the atom would have not been decided.
Question 2
1 / -0

If one were to apply Bohr's model to a particle of mass 'm' and charge 'q' moving in a plane under the influence of a magnetic field 'B', the energy of the charged particles in the $$n^{th}$$ level will be:

A
n$$(\dfrac{hqB}{8\pi m})$$

B
n$$(\dfrac{hqB}{4\pi m})$$

C
n$$(\dfrac{hqB}{2\pi m})$$

D
n$$(\dfrac{hqB}{\pi m})$$

Solution

According to given data

We know that,

$$mvr=\dfrac{nh}{2\pi }$$
Or,

$$qvB=\dfrac{m{{v}^{2}}}{r}$$

So we find,

$$qB=\dfrac{mv}{r}$$

$$qB\left( \dfrac{nh}{2\pi mv} \right)=mv$$

$$ \left( \dfrac{1}{2}m{{v}^{2}} \right)=\dfrac{nhqB}{4\pi m} $$

$$ E=n\left( \dfrac{hqB}{4\pi m} \right) $$

This is the required solution.
Question 3
1 / -0

One Bohr magneton is equal to ____________ $${ AM }^{ 2 }$$.

A
$$4.8\times { 10 }^{ -10 }eSu$$

B
$$1.6\times { 10 }^{ -19 }eSu$$

C
$$4.8\times { 10 }^{ -10 }\ eSu\ \& 1.6\times { 1 0}^{ -19 } \ eSu$$

D
$$9.27\times { 10 }^{ -24 }$$

Solution
Question 4
1 / -0

Which of the following concept was considered in Rutherford's atomic model?

A
The electrical neutrality of atom

B
Electrons revolve around nucleus at a very high speed

C
Existence of nuclear forces of attraction on the electrons.

D
All of the above

Solution

The quantization of energy was not explained by Rutherford .later it was explained by Neil bhor in his model of atom.
Question 5
1 / -0

The size of nucleus is of the order of :

A
$${10^{ - 12}}\;{\text{m}}$$

B
$${10^{ - 8}}\;{\text{m}}$$

C
$${10^{ - 15}}\;{\text{m}}$$

D
$${10^{ - 10}}\;{\text{m}}$$

Solution

Size of the nucleus is very small and of order around $$10^{-15}m$$.
Question 6
1 / -0

Which of the following are isotopes?
(i) Atom, whose nucleus contains 20p+15n
(ii) Atom whose nucleus contains 20p+17n
(iii) Atom, whose nucleus contains 18p+22n
(iv) Atom, whose nucleus contains 18p+21n

A
(i) and (iii)

B
(i) and (ii)

C
(ii) and (iii)

D
(ii) and (iv)
Question 7
1 / -0

The $$\alpha -particle$$ scattering experiment of Rutherford concluded that

A
The nucleus is made up of protons and neutrons

B
The number of electrons is exactly equal to number of protons in atom

C
The positive charge of the atom is concentrated in a very small space

D
Electrons occupy discrete energy levels

Solution
Question 8
1 / -0

The number that represents, how many times one atom of an element is heavier than mass of one atom of carbon $$ ^{12}_6C $$ is called :

A
Atomic number

B
Atomic weight

C
Relative atomic mass

D
All of these

Solution
Question 9
1 / -0

The fundamental particles present in the nucleus of an atom are:

A
Alpha particle and electrons

B
Neutrons and protons

C
Neutrons and electrons

D
Electrons, neutrons and protons
Question 10
1 / -0

Which is correct statement about proton?

A
Proton is nucleus of deuterium.

B
Proton is ionized oxygen molecule.

C
Proton is ionized hydrogen atom.

D
None of these

Solution

When a hydrogen atom loses an electron, it becomes an ion having only one proton and no electrons. So, we can say that a proton is an ionised hydrogen atom.

$$H \xrightarrow{Loses\ electron} H^+ (proton)$$

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Structure of the Atoms Test - 53

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Structure of the Atoms Test - 53

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Question 1

Get condensed or concentrated

Majority of $$\beta $$-particles passing unperfected through the foil

Very few $$\alpha $$-particles getting absorbed

Wave nature of electron

Solution

Question 2

n$$(\dfrac{hqB}{8\pi m})$$

n$$(\dfrac{hqB}{4\pi m})$$

n$$(\dfrac{hqB}{2\pi m})$$

n$$(\dfrac{hqB}{\pi m})$$

Solution

Question 3

$$4.8\times { 10 }^{ -10 }eSu$$

$$1.6\times { 10 }^{ -19 }eSu$$

$$4.8\times { 10 }^{ -10 }\ eSu\ \& 1.6\times { 1 0}^{ -19 } \ eSu$$

$$9.27\times { 10 }^{ -24 }$$

Solution

Question 4

The electrical neutrality of atom

Electrons revolve around nucleus at a very high speed

Existence of nuclear forces of attraction on the electrons.

All of the above

Solution

Question 5

$${10^{ - 12}}\;{\text{m}}$$

$${10^{ - 8}}\;{\text{m}}$$

$${10^{ - 15}}\;{\text{m}}$$

$${10^{ - 10}}\;{\text{m}}$$

Solution

Question 6

(i) and (iii)

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

Question 7

The nucleus is made up of protons and neutrons

The number of electrons is exactly equal to number of protons in atom

The positive charge of the atom is concentrated in a very small space

Electrons occupy discrete energy levels

Solution

Question 8

Atomic number

Atomic weight

Relative atomic mass

All of these

Solution

Question 9

Alpha particle and electrons

Neutrons and protons

Neutrons and electrons

Electrons, neutrons and protons

Question 10

Proton is nucleus of deuterium.

Proton is ionized oxygen molecule.

Proton is ionized hydrogen atom.

None of these

Solution

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