Structure of the Atoms Test

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Structure of the Atoms Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following is considered as the main postulate of Bohr's model of atom

A
Protons are present in the nucleus

B
Electrons are revolving around the nucleus

C
Centrifugal force produced due to the revolving electrons balances the force of attraction between electron and protons

D
Angular momentum of electron is an integral multiple of $$\dfrac{h}{2\pi}$$

Solution
Question 2
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The discovery of neutron becomes very late because

A
neturons are present in nucleus.

B
neturons are highly unstable particle.

C
neutron are chargeless.

D
neutron do not move.

Solution

This is because chargeless particles do not undergo any deflection in an electric or magnetic field.
So, option $$C$$ is correct.
Question 3
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If the Thomson model is correct what should be the observation in the $$\alpha - ray$$ scattering experiment

A
All the $$\alpha - ray$$ should pass through the gold foil

B
Only few $$\alpha - ray$$ should pass through the gold foil

C
98% of $$\alpha - ray$$ should get reflected back

D
Both B & C

Solution

According to Thomson model, positive charge is uniformly distributed with electrons embedded in it like seeds of watermelon.
$$\alpha$$ ray is much heavier than proton as $$ \alpha=^{4}_{2}He^{2+}$$. Alpha particle has mass four times that of a proton. So since the positive charge is not concentrated in one place. So alpha ray will pass through the gold foil as there is no concentrated positive charge to stop it.
Hence, option $$A$$ would be the answer, if the Thomson model is correct.
Question 4
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Proton was discovered by:

A
Chadwick

B
Thomson

C
Goldstein

D
Bohr

Solution

In 1886, Eugen Goldstein discovered canal rays or positive rays which led to the discovery of proton in 1920 by Ernest Rutherford.
From the given options, only Goldstein is related to the discovery of the proton.
Hence the correct option is $$C$$.
Question 5
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The first three radius ratio of Bohr orbits

A
$$1:0.5:0.5$$

B
$$1:2:3$$

C
$$1:4:9$$

D
$$1:8:27$$

Solution
Question 6
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Heaviest particle is

A
Meson

B
Neutron

C
Proton

D
electron

Solution

Heaviest particle of an atome is neutron. It is due to it's weight difference from others. It is 0.18% heavier than the proton which makes it most heaviest.
Option $$B$$ is correct.
Question 7
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The proton and neutron are collectively called as:

A
Deutron

B
Positron

C
Meson

D
Nucleon

Solution

The nucleus consists of protons and neutrons, collectively both are called nucleons.
Question 8
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If an electron moves away from nucleus, its potential energy:

A
decreases

B
not changes

C
increases

D
none of these

Solution

As an electron moves away from the nucleus, its potential energy increases.
Hence, option C is correct.
Question 9
1 / -0

Total number of atom in one molecule of sulfur is____.

A
2

B
6

C
4

D
8

Solution

Sulfur molecules have $$8$$ atoms in them because of their high catenation property.
$$S_8$$: Crown sulfur
Hence, option D is correct.
Question 10
1 / -0

The nucleus of helium contains

A
Four protons

B
Four neutrons

C
Two neutrons and two protons

D
Four protons and two electrons

Solution

Atomic mass of Helium is $$2$$ and atomic mass is $$4$$. So, there are $$2$$ protons and $$2$$ neutrons in the nucleus of Helium.
Option $$C$$ is correct.

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Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 48

Result

Structure of the Atoms Test - 48

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Question 1

Protons are present in the nucleus

Electrons are revolving around the nucleus

Centrifugal force produced due to the revolving electrons balances the force of attraction between electron and protons

Angular momentum of electron is an integral multiple of $$\dfrac{h}{2\pi}$$

Solution

Question 2

neturons are present in nucleus.

neturons are highly unstable particle.

neutron are chargeless.

neutron do not move.

Solution

Question 3

All the $$\alpha - ray$$ should pass through the gold foil

Only few $$\alpha - ray$$ should pass through the gold foil

98% of $$\alpha - ray$$ should get reflected back

Both B & C

Solution

Question 4

Chadwick

Thomson

Goldstein

Bohr

Solution

Question 5

$$1:0.5:0.5$$

$$1:2:3$$

$$1:4:9$$

$$1:8:27$$

Solution

Question 6

Meson

Neutron

Proton

electron

Solution

Question 7

Deutron

Positron

Meson

Nucleon

Solution

Question 8

decreases

not changes

increases

none of these

Solution

Question 9

2

6

4

8

Solution

Question 10

Four protons

Four neutrons

Two neutrons and two protons

Four protons and two electrons

Solution

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