Structure of the Atoms Test

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Structure of the Atoms Test - 13

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Weekly Quiz Competition

Question 1
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Which of the following elementary particles is not present in an atom?

A
An electron

B
A photon

C
A proton

D
A neutron

Solution

In an atom, protons and neutrons are closely packed at the center of the atom. The electrons are present in different orbits around the nucleus.

Hence, the correct answer is options B.
Question 2
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Rutherford explained the experimental observation by suggesting that the nucleus was the central part of the atom, where the entire

A
charge was confined

B
negative charge was confined

C
mass and negative charge were confined

D
mass and positive charge were confined

Solution

The entire mass and positive charge of an atom is confined at the centre of the atom to a very small volume. That is why most of the alpha particles, charged positively, did not change their directions and passed through the empty spaces of the atoms.

The correct answer is D.
Question 3
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In Rutherford’s experiment, the alpha particles that pass by the nucleus get deflected because

A
both the nucleus and the alphaparticles are positively charged

B
thenucleus is positively charged

C
the alphaparticles are negatively charged

D
both the nucleus and the alphaparticles are negatively charged

Solution

Similar charges repeal each other. The deflections of alpha particles occurred because the positively charged alpha particles and the positively charged nucleus of the atom repelled each other.

The correct answer is A.

Question 4

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Use the following information to answer the next question.

Ernest Rutherford explained his experimental observations by suggesting that the entire mass and the positive charge of an atom is confined to a small volume at its centre. This central part of the atom is called the nucleus. Protons, which are positively charged, are located within the nucleus.

The nucleus is surrounded by

negatively charged particles

positively charged particles

uniformly distributed negative charge

uniformly distributed positive charge

Solution

The nucleus of an atom is surrounded by tiny, negatively charged electrons moving in different orbits.

The correct answer is A.

Question 5

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Use the following information to answer the next question.

The electrons and the protons were the only two known sub-atomic particles for several years. In 1932, James Chadwick discovered a new sub-atomic particle with a mass little more than that of a proton but with no net charge.

The sub-atomic particle discovered by Chadwick is called

proton

neutron

positron

electron

Solution

The neutron is a subatomic particle present in the nucleus of atoms, having the same mass as that of a proton but electrically neutral in nature.

Hence, the correct answer is option B.

Question 6
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The fundamental particles of an atom are

A
protons and neutrons

B
protons, nucleus, and electrons

C
electrons and photons

D
protons, electrons, and neutrons

Solution

In an atom, protons and neutrons are closely packed at the centre. They form the nucleus of the atom and the electrons are present in different orbits around the nucleus.

Hence, the correct answer is option D.

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Structure of the Atoms Test - 13

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Structure of the Atoms Test - 13

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Question 1

An electron

A photon

A proton

A neutron

Solution

Question 2

charge was confined

negative charge was confined

mass and negative charge were confined

mass and positive charge were confined

Solution

Question 3

both the nucleus and the alphaparticles are positively charged

thenucleus is positively charged

the alphaparticles are negatively charged

both the nucleus and the alphaparticles are negatively charged

Solution

Question 4

negatively charged particles

positively charged particles

uniformly distributed negative charge

uniformly distributed positive charge

Solution

Question 5

proton

neutron

positron

electron

Solution

Question 6

protons and neutrons

protons, nucleus, and electrons

electrons and photons

protons, electrons, and neutrons

Solution

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