Structure of the Atoms Test

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Structure of the Atoms Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Almost all of the mass of an atom is concentrated at the

A
nucleus

B
neutron

C
proton

D
electron

Solution

Most of the mass of an atom is made up of protons and neutrons which are found in the nucleus. So, in essence, we can say that almost all of the mass of an atom is concentrated into a small space of the atom called the nucleus which is present at the centre of the atom.
So the correct answer is option A
Question 2
1 / -0

A neutron is:

A
neutral

B
negatively charged

C
positively charged

D
None of these

Solution

Correct Answer: Option A

Explanation:
A neutron is a subatomic particle that is present in the nucleus.
A neutron is an electrically neutral subatomic particle having mass nearly equal to that of a proton.
Question 3
1 / -0

An atom is:

A
positively charged

B
negatively charged

C
electrically neutral

D
None of these

Solution

An atom is electrically neutral. It has both positive and negative charges that are equal in magnitude. So, overall, an atom is neutral.
Question 4
1 / -0

An atom is electrically .....

A
Neutral

B
Negative

C
Positive

D
None of these

Solution
Question 5
1 / -0

Deflection back of a few particles by large angle on hitting thin foil of gold in Rutherford's experiment showed that :

A
nucleus is dense

B
nucleus is small

C
both A and B

D
electrons create hinderance in the movement of $$\displaystyle \alpha $$-particles

Solution

It was observed in Rutherford's experiment of gold foil that very few $$\alpha$$ particles were deflected back by large angles. The deflection of only a very few $$\alpha$$ particles helped him to conclude that the nucleus occupies very little space in an atom. He also concluded that the nucleus would be dense to deflect the $$\alpha$$ particles by large-angle.
Hence option C is correct.
Question 6
1 / -0

Which of the following has the greatest mass?

A
Electron

B
Proton

C
Neutron

D
Hydrogen cation

Solution

Neutron has the greatest mass. Proton is a subatomic particle with the symbol $$p$$ and positive electric charge of $$+1$$ elementary charge and a mass slightly less than that of the neutron.
Mass of neutron is $$1.6749\times10^{-27} \ kg$$
Mass of electron is $$9.109 \times 10^{-31} \ kg$$
Mass of proton is $$1.67262 \times 10^{-27} \ kg$$
Mass of hydrogen cation is $$1.6735 \times 10^{-27} \ kg$$
Hence, the correct option is C.
Question 7
1 / -0

The radius of an atom is of the order of:

A
10$$^{-10}$$ cm

B
10$$^{-13}$$ cm

C
10$$^{-15}$$ cm

D
10$$^{-8}$$ cm

Solution

On the basis of scattering experiments, Rutherford proposed the model of an atom, which is known as the nuclear atomic model.
According to this model -
(i) An atom consists of a heavy positively charged nucleus where all the protons are present.
(ii) The volume of the nucleus is very small and is only a minute fraction of the total volume of the atom.
Nucleus has a radius of the order of $$10^{-13}$$ cm and the atom has a radius of the order of $$10^{-8}$$ cm.
Question 8
1 / -0

In Rutherford's $$\alpha$$-particle scattering experiment, a very small fraction of $$\alpha$$ - particles were deflected by $$180^{\circ}$$. What did he conclude from this observation?

A
All the positive charge and mass of the atom occupy very little space.

B
Most of the space inside the atom is empty.

C
All the positive charge and mass of the atom were concentrated in a very small volume.

D
Both A and B

Solution

We conclude from this observation that all the positive charge and mass of the atom were concentrated in a very small volume. Therefore, a very small fraction of $$\alpha$$-particles are deflected by $$180^{\circ}$$.
Question 9
1 / -0

Isotone of an element has :

A
Same number of electron

B
Same number of protons

C
Same number of neutrons

D
Same number of neutrons & protons

Solution

Isotone of an element has same no. of neutrons
Question 10
1 / -0

The space between a proton and electron in hydrogen atom is:

A
full of air

B
full of ether

C
full of electromagnetic radiations

D
empty

Solution

Hydrogen atom contains one proton in the nucleus and one electron outside the nucleus.
The space between a proton and electron in hydrogen atom is empty.

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Structure of the Atoms Test - 31

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Structure of the Atoms Test - 31

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Question 1

nucleus

neutron

proton

electron

Solution

Question 2

neutral

negatively charged

positively charged

None of these

Solution

Question 3

positively charged

negatively charged

electrically neutral

None of these

Solution

Question 4

Neutral

Negative

Positive

None of these

Solution

Question 5

nucleus is dense

nucleus is small

both A and B

electrons create hinderance in the movement of $$\displaystyle \alpha $$-particles

Solution

Question 6

Electron

Proton

Neutron

Hydrogen cation

Solution

Question 7

10$$^{-10}$$ cm

10$$^{-13}$$ cm

10$$^{-15}$$ cm

10$$^{-8}$$ cm

Solution

Question 8

All the positive charge and mass of the atom occupy very little space.

Most of the space inside the atom is empty.

All the positive charge and mass of the atom were concentrated in a very small volume.

Both A and B

Solution

Question 9

Same number of electron

Same number of protons

Same number of neutrons

Same number of neutrons & protons

Solution

Question 10

full of air

full of ether

full of electromagnetic radiations

empty

Solution

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