Atomic Test

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Question 1
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According to ‘plum pudding model’ atoms on the whole are electrically neutral because

A
positive charge is concentrated at one place and negative charge is elsewhere.

B
the negative charge of the atom is uniformly distributed throughout the volume of the atom and the positively charged electrons are embedded in it

C
the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it

D
the positive charge of the atom is uniformly distributed throughout the volume of the electron and the negative charge of electrons balances positive parts

Question 2
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Emission line spectra of different elements

A
is not different

B
is the same if both elements are at the same temperature

C
is the same if both elements are in liquid form

D
is different

Question 3
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What is the shortest wavelength present in the Paschen series of spectral lines?

A
840 nm

B
800 nm

C
860 nm

D
820 nm

Question 4
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Average angle of deflection of α-particles by a thin gold foil predicted by Thomson’s model is

A
about the same as predicted by Rutherford’s model

B
incomparable to Rutherford’s model

C
about the more than predicted by Rutherford’s model

D
about the less than predicted by Rutherford’s model

Question 5
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The average lifetime of the first excited level of a hydrogen atom is 1.0 ×10⁻⁸ s. In the Bohr model, how many orbits does an electron in the n = 2 level complete before returning to the ground level?

A
9.7 ×10⁶

B
8.2 ×10⁶

C
9.2 ×10⁶

D
8.7 ×10⁶

Question 6
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Each element is associated with

A
with a characteristic spectrum of radiation

B
with a characteristic absorption of monochromatic light

C
no light radiation or absorption

D
with a characteristic radiation of monochromatic light

Question 7
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Which of these statements about Bohr model is correct?

A
Bohr model postulates wavy paths around the nucleus

B
Bohr model combines classical and early quantum concepts

C
Bohr model is based classical electromagnetic theory

D
Bohr model is pure quantum mechanical theory

Question 8
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Which of these statements about Bohr model hypothesis is correct?

A
velocity of electron is quantized

B
mass of electron is quantized

C
radius of electron is quantized

D
angular momentum of electron is quantized

Question 9
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Which of these statements about Bohr model applied to hydrogen atom correct?

A
hydrogen atom in its ground level has no magnetic moment due to orbital motion

B
hydrogen atom in its ground level has magnetic moment due to orbital motion

C
hydrogen atom in some orbits radiates electromagnetic waves

D
hydrogen atom in quantized orbits radiates electromagnetic waves

Question 10
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Probability of backward scattering (i.e., scattering of α -particles at angles greater than 90∘) predicted by Thomson’s model is

A
much less than predicted by Rutherford’s model

B
much more than predicted by Rutherford’s model

C
same as predicted by Rutherford’s model

D
more than predicted by Rutherford’s model

Question 11
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In Geiger-Marsden experiment very small deflection of the beam was expected because

A
there are no electrical forces at work

B
positive charge and the negative electrons are distributed through the whole atom reducing electric field inside the atom

C
particles are collimated by lead screens

D
most particles pass through

Question 12
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Fluorescence is

A
it consists of accelerated atoms/molecules striking suitable material

B
it consists only of atoms going into stable excited states

C
what happens in a fluorescent lamp

D
it consists of a molecule, atom or nanostructure relaxing to its ground state by emitting a photon of light after being excited to a higher quantum state by some type of energy

Question 13
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Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?

A
there would be scattering at all angles

B
there would be no scattering

C
there would be scattering at 90^∘

D
there would be no large-angle scattering

Question 14
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It is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?

A
scattering is predominantly due to a single collision

B
scattering is predominantly due to multiple collisions

C
scattering is predominantly due to deflecting fields being proportional to t

D
scattering is predominantly due to no collison

Question 15
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An electron collides with a hydrogen atom in its ground state and excites it to a state of n = 3. How much energy was given to the hydrogen atom in this inelastic collision?

A
15.1 eV

B
13.1 eV

C
12.1 eV

D
14.1 eV

Question 16
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Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?

A
The electrons would spiral inwards and fall into the nucleus

B
The waves emitted by electrons are discrete

C
Electrons do not radiate electromagnetic waves

D
The positive charge and negative electron cancel and no waves are radiated

Question 17
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Reason why there are many lines in an atomic spectrum is because

A
All atoms are in the same excited state and make transition to same state

B
There are many atoms in different states of excitation making transition to the same state

C
There are many atoms in different states of excitation making transition to different states

D
All atoms are in the same excited state and make transition to different states

Question 18
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In the ground state of which model electrons are in stable equilibrium with zero net force?

A
Bohr model

B
No model

C
Rutherford’s model

D
Thomson’s model

Question 19
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A triply ionized beryllium ion Be³⁺, (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom except that the nuclear charge is four times as great. For the hydrogen atom, the wavelength of the photon emitted in the n =2 to n=1 to transition is 122 nm. What is the wavelength of the photon emitted when a Be³⁺ion undergoes this transition?

A
7.60 nm

B
10.60 nm

C
9.60 nm

D
8.60 nm

Question 20
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In Geiger-Marsden experiment, at the point of closest approach

A
the kinetic energy is not zero and the electrical potential is less than the initial kinetic energy supplied

B
the kinetic energy is not zero and the electrical potential equals the initial kinetic energy supplied

C
the kinetic energy is zero and the electrical potential equals the initial kinetic energy supplied

D
the kinetic energy is not zero and the electrical potential is greater than the initial kinetic energy supplied

Question 21
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Fluorescent lamps are more efficient than incandescent lamps in converting electrical energy to visible light because

A
they produce more white light

B
they do not use uv radiations

C
they do not waste as much energy producing (invisible) infrared photons

D
they do not waste as much energy producing visible photons

Question 22
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In which of the models An atom has a nearly continuous mass distribution?

A
Thomson’s model

B
Bohr model

C
Rutherford’s model

D
No model

Question 23
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Find the longest wavelength present in the Balmer series of hydrogen, corresponding to the H- line.

A
656 nm

B
676 nm

C
666 nm

D
686 nm

Question 24
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According to Bohr model radiation takes place when

A
there is transition from one of the stable orbits of definite energy to another of higher energy

B
there is transition from one of the unstable orbits of definite energy to another of higher energy

C
there is transition from one of the unstable orbits of definite energy to another of same energy

D
there is transition from one of the stable orbits of definite energy to another of lower energy. hν = E^f−E_i

Question 25
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The model that best explains the results of Geiger-Marsden experiment is

A
Thomson model

B
Anderson model

C
Rutherford model

D
None of the above

Question 26
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To produce an emission spectrum of hydrogen

A
It needs to be in glowing gaseous form

B
It needs to be cold and white light shining through

C
It needs to be cool liquid form

D
It needs to be hot and white light shining through

Question 27
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According to Bohr model allowed values of angular momentum are

A
integral multiples of h

B
continuous

C
integral multiples of h/ π

D
integral multiples of h/2 π

Question 28
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Which of these statements about Bohr model hypothesis is correct?

A
angular momentum is not quantized

B
electron in a stable orbit does not radiate electromagnetic waves

C
velocity of electron is quantized

D
electron in a stable orbit emit quanta of light

Question 29
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In a Geiger -Marsden experiment, what is the distance of closest approach d to the nucleus of a 7.7 MeV α−particle before it comes momentarily to rest and reverses its direction?

A
35 fm

B
40 fm

C
30 fm

D
45 fm

Question 30
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Absorption line spectrum is obtained

A
If we pass off-white (discrete-spectrum) light through a cool gas

B
If we pass white (continuous-spectrum) light through a hot gas

C
If we pass off-white (discrete-spectrum) light through a hot gas

D
If we pass white (continuous-spectrum) light through a cool gas

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Atomic Test - 5...

Question 1

positive charge is concentrated at one place and negative charge is elsewhere.

the negative charge of the atom is uniformly distributed throughout the volume of the atom and the positively charged electrons are embedded in it

the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it

the positive charge of the atom is uniformly distributed throughout the volume of the electron and the negative charge of electrons balances positive parts

Question 2

is not different

is the same if both elements are at the same temperature

is the same if both elements are in liquid form

is different

Question 3

840 nm

800 nm

860 nm

820 nm

Question 4

about the same as predicted by Rutherford’s model

incomparable to Rutherford’s model

about the more than predicted by Rutherford’s model

about the less than predicted by Rutherford’s model

Question 5

9.7 ×106

8.2 ×106

9.2 ×106

8.7 ×106

Question 6

with a characteristic spectrum of radiation

with a characteristic absorption of monochromatic light

no light radiation or absorption

with a characteristic radiation of monochromatic light

Question 7

Bohr model postulates wavy paths around the nucleus

Bohr model combines classical and early quantum concepts

Bohr model is based classical electromagnetic theory

Bohr model is pure quantum mechanical theory

Question 8

velocity of electron is quantized

mass of electron is quantized

radius of electron is quantized

angular momentum of electron is quantized

Question 9

hydrogen atom in its ground level has no magnetic moment due to orbital motion

hydrogen atom in its ground level has magnetic moment due to orbital motion

hydrogen atom in some orbits radiates electromagnetic waves

hydrogen atom in quantized orbits radiates electromagnetic waves

Question 10

much less than predicted by Rutherford’s model

much more than predicted by Rutherford’s model

same as predicted by Rutherford’s model

more than predicted by Rutherford’s model

Question 11

there are no electrical forces at work

positive charge and the negative electrons are distributed through the whole atom reducing electric field inside the atom

particles are collimated by lead screens

most particles pass through

Question 12

it consists of accelerated atoms/molecules striking suitable material

it consists only of atoms going into stable excited states

what happens in a fluorescent lamp

it consists of a molecule, atom or nanostructure relaxing to its ground state by emitting a photon of light after being excited to a higher quantum state by some type of energy

Question 13

there would be scattering at all angles

there would be no scattering

there would be scattering at 90∘

there would be no large-angle scattering

Question 14

scattering is predominantly due to a single collision

scattering is predominantly due to multiple collisions

scattering is predominantly due to deflecting fields being proportional to t

scattering is predominantly due to no collison

Question 15

15.1 eV

13.1 eV

12.1 eV

14.1 eV

Question 16

The electrons would spiral inwards and fall into the nucleus

The waves emitted by electrons are discrete

Electrons do not radiate electromagnetic waves

9.7 ×10⁶

8.2 ×10⁶

9.2 ×10⁶

8.7 ×10⁶

there would be scattering at 90^∘

there is transition from one of the stable orbits of definite energy to another of lower energy. hν = E^f−E_i