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Online Tests
ECAT Pre General Science Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers
Question # 1
The results of spectra obtained by Balmer were expressed in 1896 by:
Choose an answer
Bohr
Rydberg
Planck
Rutherford
Coulomb
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Question # 2
A metastable stae:
Choose an answer
Is an excited state
Is that in which excited electron is stable
Is that in which excited electron is usually unstable
Means a time interval of 10
-8
second
Both (A) and (C)
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Question # 3
Braking radiation causes:
Choose an answer
Continuous spectrum
Line Spectrum
Band spectrum
Discrete specturm
All of these
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Question # 4
The spectrum emitted from hydrogen filled discharge tube is:
Choose an answer
Line spectrum
Discrete spectrum
And spectrum
Absorption spectrum
Both (A) and (B)
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Question # 5
The holes created in the L and M shells are occupied by transitions of:
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Electrons from lower states
Electrons from higher state
Positrons from higher states
Electrons from K shell
Both (A) and (B)
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Question # 6
An electron of the hydrogen atom in the second orbit is called its:
Choose an answer
Ground state
Excited state
Ionized state
Any of these
None of these
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Question # 7
The range of wavelengths of colurs in the visible colours is
Choose an answer
140 nm to 456 nm
10 nm to 56 nm
410 nm to 656 nm
910 nm to 956 nm
None of these
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Question # 8
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Choose an answer
one
two
three
four
five
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Question # 9
Gaussian surface is always:
Choose an answer
Rectangular
Spherical
Cylinder
Box shape
Any of these
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Question # 10
The shell closer to the nucleus is called:
Choose an answer
N shell
L shell
K shell
M shell
O shell
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Question # 11
Balmer series lies in that region of electromagnetic wave spectrum which is called:
Choose an answer
Visible region
Invisible region
Infra-red region
ultraviolet region
None of these
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Question # 12
In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:
Choose an answer
Short wavelength
Large wavelength
Very large wavelenth
Low frequency
Both (B) and (C)
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Question # 13
Selenium is:
Choose an answer
An insulator
A conductor
Both A and B
Excellent conductor
None of these
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Question # 14
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Choose an answer
Ultra red region
Visible region
Ultraviolet region
Any of these
None of these
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Question # 15
The first shell near the neucles is
Choose an answer
L-shell
X-shell
N-shell
M-shell
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Question # 16
The natural arrangement of colours in the spectrum of white light spectrum is
Choose an answer
VIBGYOR
ROYBGIV
ROYBIGV
BIGROYV
None of these
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Question # 17
The first series which was identified in the spectrum of hydrogen is called:
Choose an answer
Lyman series
Balmer series
Paschen series
Brackett series
Pfund series
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Question # 18
Static electricity is produced by the transfer of:
Choose an answer
Electrons
Protons
One fluid
Two fluid
None of these
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Question # 19
CT scanning is the abbreviated name of
Choose an answer
Computed Technology
Computed Technique
Computed Technology
Computerized Technique
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Question # 20
Tick the series which lie/s in. the infra-red region.
Choose an answer
Pfund series
Brackett series
Paschen series
All of these
None of these
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Question # 21
The process of formation of spectrum is called:
Choose an answer
Interference
Spectroscopy
Dispersion
Reflection
Botha (A) and (D)
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Question # 22
The value of the metastable state for Neon is
Choose an answer
20.66eV
20.61eV
19.23eV
18.70eV
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