Structure of the Atoms Test

Result

Structure of the Atoms Test - 44

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

What are the limitations of Rutherford's nuclear model?

A
Electrons should undergoes spiral path and fall into nucleus

B
Could not explain hydrogen spectrum

C
Electron lose energy while in motion

D
All of these

Solution

The major shortcoming of Rutherford's model was that it was incomplete. It did not explain how the atom's negatively charged electrons are distributed in the space surrounding its positively charged nucleus. According to the model electron’s speed will keep reducing as the electron keeps giving off energy by emitting EM waves and the radius of its rotation will keep decreasing and it will soon crash into the nucleus. If it crashed into the nucleus, atoms wouldn’t exist which does not happen. Also, it could not explain the Hydrogen spectrum.

Hence, above all are the shortcomings of Rutherford's model.
Question 2
1 / -0

According to the drawback of Rutherford's structure of atom electron should fall into the :

A
space

B
outer enviroment

C
shell

D
nucleus

Solution

Rutherford explained that electrons revolve around the nucleus in a circular path. By following a circular path, energy is lost by electrons, and ultimately they will fall into the nucleus.
Hence option D is correct.
Question 3
1 / -0

Which of the following is not a drawback of Rutherford's model?

A
Rutherford did not mention any direct link between the charge of the nucleus and the atomic mass.

B
He did not mention the relation between the charge of the nucleus and atomic number.

C
Both A and B

D
None of these

Solution

Rutherford did not relate the nuclear charge and atomic number or atomic mass. Thus it was difficult to analyze the nuclear charge. Hence statements in both option A and B are drawback of Rutherford's model. Hence answer of given question is option C.
Question 4
1 / -0

According to Rutherford's atomic model, electron:

A
are not stationary

B
revolve around the nucleus

C
feels force of attraction by nucleus

D
all of these

Solution

Rutherford's atomic model states that electron revolves around the nucleus of the atom in a circular path and negatively charged electron feel attraction by the positively charged nucleus (due to proton).

Hence option $$D$$ is correct.
Question 5
1 / -0

Rutherford in his atomic model could not explain behaviour of :

A
electrons

B
protons

C
neutrons

D
all of these

Solution

Rutherford did a famous gold foil experiment in which he used alpha ray.
In conclusion, he said that there is a very dense part in an atom (Nucleus) but couldn't explain much about the behaviour of electrons in the atom apart from stating that the electrons revolve around the nucleus.
Question 6
1 / -0

In Bohr's model, if the atomic radius of the first orbit $${r}_{1}$$, then radius of fourth orbit will be:

A
$$4{r}_{1}$$

B
$$6{r}_{1}$$

C
$$16{r}_{1}$$

D
$$\dfrac{{r}_{1}}{16}$$

Solution

In Bohr's model, if the atomic radius of the first orbit $$\displaystyle r_1$$, then the radius of the fourth orbit will be $$\displaystyle 16 \times r_1$$.

In general,

$$\displaystyle r_n = n^2 \times r_1$$

$$\therefore \displaystyle r_4 = 4^2 \times r_1$$

$$\therefore \displaystyle r_4 = 16 \times r_1$$

Hence, option $$C$$ is correct.
Question 7
1 / -0

Neutrino has

A
charge $$+1$$, mass $$1$$

B
charge $$0$$, mass $$0$$

C
charge $$-1$$, mass $$1$$

D
charge $$0$$, mass $$1$$

Solution

Neutrino has charge 0, mass 0. It was postulated by Fermi in 1934.
Question 8
1 / -0

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because:

A
alpha particles are much heavier than electrons

B
alpha particles are positively charged

C
most part of the atom is empty space

D
alpha particles move with very high velocity
Solution
Correct answer: Option $$C$$
Explanation of correct answer:
In Rutherford's alpha scattering experiment, when we pass the alpha particle on gold foil there are a few observations which is recorded as;
1. Most of the particles remain undeflected
2. Some of the particles are deflected through a small angles.
3. Very few particles are deflected by $$180^0$$ and came back
So we can conclude from that;
Atom has most space as empty.
A very small mass is concentrated in a small area called a nucleus.
The mass of an atom is concentrated at the central nucleus and the remaining part is empty.
Therefore, the positively charged alpha particles when sent through metal foil go straight through the foil.
Explanation of incorrect answer:
As only empty space is allowed to pass alpha particles to go straight, hence all other options are not valid.
Question 9
1 / -0

The discovery of neutron came very late because:

A
it is present in nucleus

B
it is a fundamental particle

C
it does not move

D
it does not carry any charge

Solution

The discovery of neutron came very late because it does not carry any charge.

Neutron was discovered by Chadwick.

To overcome the failure of the proton-electron hypothesis, Rutherford, in 1920, proposed the existence of neutral particles made from a close combination of proton and electron. He named it a neutron.

In 1932, Lord Chadwick proved the existence of neutrons by bombarding lighter elements (boron and beryllium) with alpha particles which resulted in the emission of highly penetrating neutral radiation.

Hence, the correct option is $$\text{D}$$.
Question 10
1 / -0

Radius of a nucleus is proportional to:

A
$$A$$

B
$${A}^{{1}/{3}}$$

C
$${A}^{2}$$

D
$${A}^{{2}/{3}}$$

Solution

The radius of a nucleus is proportional to $$\displaystyle {A}^{{1}/{3}}$$ and it is calculated by using the below equation.
$$\displaystyle r =r_o \times {A}^{{1}/{3}}$$
Where $$r$$ is the radius of the nucleus with mass number A and $$\mathrm {r_o= 1.2 \times 10^{-15}m}$$ (it is a constant).

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Structure of the Atoms Test - 44

Result

Structure of the Atoms Test - 44

Score

-

Rank

-

SHARING IS CARING

Question 1

Electrons should undergoes spiral path and fall into nucleus

Could not explain hydrogen spectrum

Electron lose energy while in motion

All of these

Solution

Question 2

space

outer enviroment

shell

nucleus

Solution

Question 3

Rutherford did not mention any direct link between the charge of the nucleus and the atomic mass.

He did not mention the relation between the charge of the nucleus and atomic number.

Both A and B

None of these

Solution

Question 4

are not stationary

revolve around the nucleus

feels force of attraction by nucleus

all of these

Solution

Question 5

electrons

protons

neutrons

all of these

Solution

Question 6

$$4{r}_{1}$$

$$6{r}_{1}$$

$$16{r}_{1}$$

$$\dfrac{{r}_{1}}{16}$$

Solution

Question 7

charge $$+1$$, mass $$1$$

charge $$0$$, mass $$0$$

charge $$-1$$, mass $$1$$

charge $$0$$, mass $$1$$

Solution

Question 8

alpha particles are much heavier than electrons

alpha particles are positively charged

most part of the atom is empty space

alpha particles move with very high velocity

Solution

Question 9

it is present in nucleus

it is a fundamental particle

it does not move

it does not carry any charge

Solution

Question 10

$$A$$

$${A}^{{1}/{3}}$$

$${A}^{2}$$

$${A}^{{2}/{3}}$$

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.