Structure of Atom Test

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Structure of Atom Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

In the phenomenon of electric discharge through
gases at low pressure, the coloured glow in the
tube appears as a result of:

A
collisions between the charged particles emitted from the cathode and the atoms of the gas

B
collision between different electrons of the atoms of the gas

C
excitation of electrons in the atoms

D
collision between the atoms of the gas

Solution

Collisions between charged particles emitted from cathode and atoms of gas.
The discharge of electricity through liquefied gases is an interesting phenomenon which can be systematically studied with the help of a discharge tube.In discharge tube collision between charged particles emitted from cathode and atoms of the gas results to colorless glow in tube.
Question 2
1 / -0

The life span of atomic hydrogen is :

A
fraction of one sec.

B
one year

C
one hour

D
one day

Solution

The life span of hydrogen is approximately 0.3 sec.
Hence option A.
Question 3
1 / -0

In Thomson's model of the atom, which of the following statements is/are correct?
(i) The mass of the atom is assumed to be uniformly distributed over the atom.
(ii) The positive charge is assumed to be uniformly distributed over the atom.
(iii) The electrons are uniformly distributed in the positively charged sphere.
(iv) The electrons attract each other to stabilize the atom.

A
(i), (ii) and (iii)

B
(i) and (iii)

C
(i) and (iv)

D
(i), (iii) and (iv)

Solution

According to Thomson, the model of an atom is similar to a Christmas pudding.
The electrons are studded like currants(decorated) in a positively charged sphere like Christmas pudding and the mass of the atom was supposed to be uniformly distributed.
Therefore (i), (ii) and (iii) are all correct.
Hence the correct option is A.
Question 4
1 / -0

When an electron do transition from n = 4 to n=2, the emitted line of spectrum will be:

A
first line of Lyman series

B
second line of Balmer series

C
first line of Paschen series

D
second line of Paschen series

Solution

Balmer series corresponds to visible region.
Now for, $$n=4,n=2$$ we get
$$4-2=2$$
Therefore second line of Balmer series region will be visible.
Question 5
1 / -0

The Bohr model of atoms:

A
uses Einstein's photo electric equation

B
predicts continuous emission spectra for atoms

C
predicts the same emission spectra for all types of atoms

D
assumes that the angular momentum of electrons is quantized

Solution

Bohr model of an atom states that only those orbits are allowed where angular momentum of electron are integral multiple of $$nh/2\pi$$. These orbits have quantized energy and angular momentum associated with electron.
The model can be applied to hydrogen or hydrogen-like atoms to explain their line emission spectrum.
Option D is correct.
Question 6
1 / -0

The mass number of a nucleus is:

A
always less than its atomic number

B
always more than its atomic number

C
sometimes equal to its atomic number

D
sometimes equal and sometimes more than its atomic number

Solution
Question 7
1 / -0

Isotopes have same____but different____.

A
atomic number, mass number

B
mass number, atomic number

C
number of neutrons, atomic number

D
None of these

Solution

Isotopes of an element have same atomic number and different mass numbers.
Question 8
1 / -0

When electron jumps from N shell to L shell, the energy is:

A
emitted

B
absorbed

C
reflected

D
cannot be predicted

Solution

The energy is released when an electron jumps from N shell to L shell as N shell have higher energy than L shell, so, it emits a photon when it transits from N to L shell.
Question 9
1 / -0

The minimum angular momentum that can be possessed by an electron in hydrogen atom is:

A
$$\dfrac{h}{4\pi }$$

B
$$\dfrac{2h}{\pi }$$

C
$$\dfrac{h}{2\pi }$$

D
$$2\pi r$$

Solution

The angular momentum that can be possessed by an electron in the hydrogen atom is given as; $$\dfrac{nh}{2\pi }$$;

where n = orbit in which electron is revolving.

So, for minimum angular momentum, $$n=1$$, therefore, the minimum angular momentum is $$\dfrac h{2 \pi}$$.

Hence, option $$C$$ is correct.
Question 10
1 / -0

Which of the following do not represent Bohr's model of an atom correctly?

A
(i) and (ii)

B
(ii) and (iii)

C
(ii) and (iv)

D
(i) and (iv)

Solution

The electronic configuration of an atom of the element is derived using Bohr's formula $$2n^{2}$$, where $$n$$ is the no. of orbit.
According to this formula, the first shell can contain only 2 electrons and the second shell contain not more than 8 electrons.

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Structure of Atom Test - 27

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Structure of Atom Test - 27

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Question 1

collisions between the charged particles emitted from the cathode and the atoms of the gas

collision between different electrons of the atoms of the gas

excitation of electrons in the atoms

collision between the atoms of the gas

Solution

Question 2

fraction of one sec.

one year

one hour

one day

Solution

Question 3

(i), (ii) and (iii)

(i) and (iii)

(i) and (iv)

(i), (iii) and (iv)

Solution

Question 4

first line of Lyman series

second line of Balmer series

first line of Paschen series

second line of Paschen series

Solution

Question 5

uses Einstein's photo electric equation

predicts continuous emission spectra for atoms

predicts the same emission spectra for all types of atoms

assumes that the angular momentum of electrons is quantized

Solution

Question 6

always less than its atomic number

always more than its atomic number

sometimes equal to its atomic number

sometimes equal and sometimes more than its atomic number

Solution

Question 7

atomic number, mass number

mass number, atomic number

number of neutrons, atomic number

None of these

Solution

Question 8

emitted

absorbed

reflected

cannot be predicted

Solution

Question 9

$$\dfrac{h}{4\pi }$$

$$\dfrac{2h}{\pi }$$

$$\dfrac{h}{2\pi }$$

$$2\pi r$$

Solution

Question 10

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(i) and (iv)

Solution

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