Structure of Atom Test

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Structure of Atom Test - 1

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Question 1
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Cathode rays (electrons) have

A
mass only

B
charge only

C
no mass and charge

D
both mass and charge

Solution

Cathode rays (also called an electron beam or e-beam) are streams of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with two electrodes and a voltage is applied, the glass opposite of the negative electrode is observed to glow, due to electrons emitted from and travelling perpendicular to the cathode (the electrode connected to the negative terminal of the voltage supply). They were first observed in 1869 by German physicist Johann Hittorf, and were named in 1876 by Eugen Goldstein kathodenstrahlen, or cathode rays. Cathode rays (electrons) have both mass and charge.
Question 2
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Atoms of elements A and B, having same mass number but different atomic numbers are called

A
isotopes

B
isobars

C
isotones

D
isomers

Solution

Atoms of elements A and B, having same mass number but different atomic numbers are called isobars.
Question 3
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The isotopes of an element differ in

A
the charge on the nucleus

B
the number of neutrons in the nucleus

C
the number of extra nuclear electrons

D
both the nuclear charge and the number of extra nuclear electrons

Solution

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons.
Question 4
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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 high velocity

Solution

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because when alpha particles are sent through a thin metal foil, most of them go straight through the foil because.
Question 5
1 / -0

The number of neutrons, in dipositive zinc ion Zn²⁺, with mass number 70 is

A
34

B
36

C
38

D
40

Solution

The number of neutrons, in dipositive zinc ion Zn²⁺, with mass number 70 is 40.
Question 6
1 / -0

An electron in a 4s orbital, may have a magnetic quantum number value of

A
- 2

B
0

C
- 3

D
1

Solution

For 4s orbital, n = 4, l = 0, m = 0
Question 7
1 / -0

Which of the following statements is wrong?

A
All photons do not carry the same amount of energy

B
The energy of radiation increases with decrease in the wavelength

C
The energy of radiation increases with increase in the wave number

D
None of these

Solution

All the given statements are correct.
Question 8
1 / -0

Bohr model can explain

A
the spectrum of hydrogen atom only

B
the spectrum of an atom or ion containing one electron only

C
the spectrum of hydrogen molecule

D
the solar spectrum

Solution

Bohr model can explain the spectrum of an atom or ion containing one electron only.
Question 9
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The principal quantum number of an atom is related to the

A
main energy level

B
spin angular momentum

C
orbital angular momentum

D
orientation of the orbital in space

Solution

The principal quantum number of an atom is related to the main energy level.
Question 10
1 / -0

Electromagnetic radiation with maximum wave length is

A
radiowave

B
ultra - violet

C
X - rays

D
infrared

Solution

Electromagnetic radiation with maximum wave length is radiowave.
Question 11
1 / -0

Which of the following statements is correct?

A
The different energy levels are equally spaced.

B
The energy of the electron decreases as the value of n increases.

C
The energy of the electrons in an atom is negative.

D
Bohr's theory explains the spectrum of multi-electron atoms.

Solution

An electron in an atom has negative energy because it is in a bound state. That means that it cannot escape the atom unless it is given energy.
Question 12
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Atoms may be regarded as comprising of protons neutrons and electrons. If the mass attributed to a neutron were halved and that attributed to the electron were doubled, the atomic mass of ₆C¹² would

A
remain approximately the same

B
be approximately doubled

C
be approximately halved

D
be reduced approximately by 25%

Solution

In ₆C¹² number of neutrons = 6 and protons = 6. If mass of neutron is halved, the atomic mass will now be 9, in place of initial mass 12 and reduction of 25% will be there.
Question 13
1 / -0

It is impossible to determine the exact position and the exact energy of an electron, simultaneously. This statement is known as

A
Pauli's Exclusion Principle

B
Hund's Rule

C
Heisenberg's Uncertainty Principle

D
Aufbau's Principle

Solution

It is impossible to determine the exact position and the exact energy of an electron, simultaneously. This statement is known as Heisenberg's Uncertainty Principle.
Question 14
1 / -0

The following question has four choices out of which ONLY ONE is correct.

The Aufbau's principle implies that a new electron will enter an orbital, for which,

A
n has a lower value

B
I has a lower value

C
the value of (n + l) is minimum

D
the value of (n + l) is maximum

Solution

The Aufbau's principle implies that a new electron will enter an orbital, for which, the value of (n + l) is minimum.
Question 15
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Rutherford's alpha particles scattering experiment eventually led to the conclusion that

A
mass and energy are related

B
electrons occupy space around the nucleus

C
neutrons are buried deep in the nucleus

D
the point of impact with matter can be precisely determined

Solution

Rutherford's alpha particles scattering experiment eventually led to the conclusion that electrons occupy space around the nucleus.

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Structure of Atom Test - 1

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Structure of Atom Test - 1

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SHARING IS CARING

Question 1

mass only

charge only

no mass and charge

both mass and charge

Solution

Question 2

isotopes

isobars

isotones

isomers

Solution

Question 3

the charge on the nucleus

the number of neutrons in the nucleus

the number of extra nuclear electrons

both the nuclear charge and the number of extra nuclear electrons

Solution

Question 4

alpha particles are much heavier than electrons

alpha particles are positively charged

most part of the atom is empty space

alpha particles move with high velocity

Solution

Question 5

34

36

38

40

Solution

Question 6

- 2

0

- 3

1

Solution

Question 7

All photons do not carry the same amount of energy

The energy of radiation increases with decrease in the wavelength

The energy of radiation increases with increase in the wave number

None of these

Solution

Question 8

the spectrum of hydrogen atom only

the spectrum of an atom or ion containing one electron only

the spectrum of hydrogen molecule

the solar spectrum

Solution

Question 9

main energy level

spin angular momentum

orbital angular momentum

orientation of the orbital in space

Solution

Question 10

radiowave

ultra - violet

X - rays

infrared

Solution

Question 11

The different energy levels are equally spaced.

The energy of the electron decreases as the value of n increases.

The energy of the electrons in an atom is negative.

Bohr's theory explains the spectrum of multi-electron atoms.

Solution

Question 12

remain approximately the same

be approximately doubled

be approximately halved

be reduced approximately by 25%

Solution