Atoms Test

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Atoms Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

The radius of a shell for $$H-atom$$ is $$4.761\,\overset{o}{A}$$. The value of n is:

A
3

B
9

C
5

D
None of these

Solution

We know, Bhor's radius
$$ r_{n} = 52.9n^{2}$$ Pm $$ \rightarrow (1)$$
As we are given,
$$r_{n} = 4.761\dot{A}$$ $$ \rightarrow (2)$$
equating both the equations
$$ 4.761\times 10^{-10} = 52.9 n^{2}\times 10^{-10}$$
$$ n^{2} = 9$$
$$ n = 3 $$
Question 2
1 / -0

Which of the following samples will have the same number of atoms as 40 g calcium?

A
24 g magnesium

B
64 g silphur

C
14 g nitrogen

D
8 g oxygen

Solution

Molar mass of $$Ca=M`= 40$$
Molar mass of$$Mg=M=24$$
Given mass of $$Ca= m`=40g$$
Given mass of $$Mg=m=?$$

Formula: $$m= m`× M/ M`$$

$$m= 40\times \dfrac{24}{40}$$

$$m= 24g$$
Question 3
1 / -0

The band spectra (characteristic of molecular species) is due to emission of radiation

A
Gaseous state

B
Liquid state

C
Solid state

D
All of three states

Solution

Solids and liquids give continuous and line spectra. Only gases are known to give band spectra.
Question 4
1 / -0

Emission spectrum of $$CO_{2}$$ gas

A
Is a line spectrum

B
Is a band spectrum

C
Is a continuous spectrum

D
Does not fall in the visible region

Solution

The emission spectrum of $$CO_2$$ gas that has been studied by the electron beam excitation method is a band spectrum.
Question 5
1 / -0

Number of spectral lines in hydrogen atom is

A
$$3$$

B
$$6$$

C
$$15$$

D
Infinite

Solution

Infinitely large transition are possible (in principle) for the hydrogen atom
Question 6
1 / -0

Two photons of same frequencies moving in same medium have:
a) same linear momenta and wavelengths
b) same linear momenta and same speeds
c) same energies and same linear momenta

A
a only correct

B
a and b only are correct

C
b and c only are correct

D
a, b,and c are correct

Solution

$$V_{1}=V_{2}$$
$$\dfrac{C}{\lambda _{1}}=\dfrac{C}{\lambda _{2}}$$
So $$\lambda_{1} =\lambda _{2}$$
& linear momentum
$$P=\dfrac{h}{\lambda }$$
$$P_{1}=\dfrac{h}{\lambda _{1}}$$
$$P_{2}=\dfrac{h}{\lambda _{2}}$$
$$\therefore P_{1}=P_{2}$$
And $$E_{1}=P_{1}C$$
$$E_{2}=P_{2}C$$
So $$E_{1}=E_{2}$$
Question 7
1 / -0

Which of the following relates to photons both as wave motion and as a stream of particles?

A
Interference

B
$$E= mc^{2}$$

C
Diffraction

D
E $$= h\nu$$

Solution

$$(a)$$ Interference exhibits the wave nature of light.
$$(b)$$ $$ E = m c^{2}$$ exhibits the particles nature of light
$$(c)$$ Diffraction exhibits the wave nature of light.
$$(d)$$ $$E = h \nu$$ shows both particle nature and wave nature of light, i.e., light is having a particular wavelength $$ \lambda$$ and the energy is in the form of packets.

Question 8

1 / -0

Match the following :

Type I	Type II
a) Continuous emission spectrum	e) Tungsten filament of bulb
b) Line emission spectrum	f) $$CO_2$$ gas
c) Band emission spectrum	g) Sodium vapour lamp
d) Line absorption spectrum	h) chromosphere of sun

a-e; b-f; c-g; d-h

a-f; b-e; c-h; d-e

a-e; b-g; c-f; d-h

a-h; b-g; c-f; d-e

Solution

Continuous emission spectrum can be seen for Tungsten emission filament of bulb.
Line emission spectrum is observed when sodium Vapour lamp is used.
Band emission spectrum is observed for molecules like $$CO_{2}$$ gas.
Line absorption spectrum is observed when elements in chromospere of sun absorb light of their characteristics wavelength.

Question 9
1 / -0

A cathode ray tube has a potential difference of $$V$$ between the cathode and anode. The speed of the cathode rays is given by

A
$$v \propto V$$

B
$$v \propto V^{-1}$$

C
$$v \propto \sqrt{V}$$

D
$$v \propto V ^{2}$$

Solution

$$PD = V$$
$$KE = eV = $$$$\dfrac{1}{2} mv^2 $$ $$ m =$$ mass of cathode particle
$$v = $$$$\sqrt{(\dfrac{2e}{m})V} $$ $$ v =$$ max velocity, $$e =$$ charge on cathode particle
$$ v \propto \sqrt V $$
Question 10
1 / -0

In X-ray spectrum, transition of an electron from an outer shell to an inner shell gives a characteristics X-ray spectral line. If we consider the spectral lines $$K_{\beta },L_{\beta },M_{\alpha }$$ then

A
$$K_{\beta }$$ and $$L_{\beta }$$ have a common inner shell

B
$$K_{\beta }$$ and $$L_{\beta }$$ have a common outer shell

C
$$L_{\beta }$$ and $$M_{\alpha }$$ have a common outer shel1

D
$$L_{\beta }$$ and $$M_{\alpha }$$ have a common inner shell

Solution

$$K_{\alpha }$$ means, electron jumps from L shell to K shell.
similarly $$L_{\alpha}$$ means electron jumps from M shell to L shell
$$L_{\beta }$$ means electron jumps from N shell to L shell.
$$M_{\alpha }$$ means electron jumps from N shell to M shell.

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Atoms Test - 24

Result

Atoms Test - 24

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SHARING IS CARING

Question 1

3

9

5

None of these

Solution

Question 2

24 g magnesium

64 g silphur

14 g nitrogen

8 g oxygen

Solution

Question 3

Gaseous state

Liquid state

Solid state

All of three states

Solution

Question 4

Is a line spectrum

Is a band spectrum

Is a continuous spectrum

Does not fall in the visible region

Solution

Question 5

$$3$$

$$6$$

$$15$$

Infinite

Solution

Question 6

a only correct

a and b only are correct

b and c only are correct

a, b,and c are correct

Solution

Question 7

Interference

$$E= mc^{2}$$

Diffraction

E $$= h\nu$$

Solution

Question 8

a-e; b-f; c-g; d-h

a-f; b-e; c-h; d-e

a-e; b-g; c-f; d-h

a-h; b-g; c-f; d-e

Solution

Question 9

$$v \propto V$$

$$v \propto V^{-1}$$

$$v \propto \sqrt{V}$$

$$v \propto V ^{2}$$

Solution

Question 10

$$K_{\beta }$$ and $$L_{\beta }$$ have a common inner shell

$$K_{\beta }$$ and $$L_{\beta }$$ have a common outer shell

$$L_{\beta }$$ and $$M_{\alpha }$$ have a common outer shel1

$$L_{\beta }$$ and $$M_{\alpha }$$ have a common inner shell

Solution

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