More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
ECAT 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
Previous
Skip
Next
Question # 2
Atoms of hydrogen gas can be excited by passing electric current through it when the gas is filled into the discharge tube at a pressure which is
Choose an answer
Less than atmospheric pressure
Much less than atmospheric pressure
Greater than atmospheric pressure
Much greater than atmospheric pressure
Both C and D
Previous
Skip
Next
Question # 3
Energy required by an electron revolving in certain orbit to jump to an excited state is called:
Choose an answer
Ionization energy
Ionization potential
Excitation energy
Excitation potential
None of these
Previous
Skip
Next
Question # 4
The process of formation of spectrum is called:
Choose an answer
Interference
Spectroscopy
Dispersion
Reflection
Botha (A) and (D)
Previous
Skip
Next
Question # 5
The results of spectra obtained by Blamer were expressed in 1896 by
Choose an answer
Bohr
Rydberg
Planck
Rutherford
Coulomb
Previous
Skip
Next
Question # 6
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)
Previous
Skip
Next
Question # 7
An compared to solid matter, a crack or an air bubble allows:
Choose an answer
Great amount of X-rays to pass
Smallast amount of X-rays to pass
Very samall amount of X-rays to pass
Any of these
None of these
Previous
Skip
Next
Question # 8
The holes created in the L and M shells are occupied by transitions of:
Choose an answer
Electrons from lower states
Electrons from higher state
Positrons from higher states
Electrons from K shell
Both (A) and (B)
Previous
Skip
Next
Question # 9
The life time of metastable state is equal to
Choose an answer
Life time of excited state
Greater than by excited state
Zero
Less than by excited state
Previous
Skip
Next
Question # 10
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
Previous
Skip
Next
Question # 11
Static electricity is produced by the transfer of:
Choose an answer
Electrons
Protons
One fluid
Two fluid
None of these
Previous
Skip
Next
Question # 12
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
Previous
Skip
Next
Question # 13
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
Previous
Skip
Next
Question # 14
Braking radiation causes:
Choose an answer
Continuous spectrum
Line Spectrum
Band spectrum
Discrete specturm
All of these
Previous
Skip
Next
Question # 15
The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is
Choose an answer
1.24 x 10
-10
m
7.92 x 10
-20
m
2.78 x 10
-14
m
3.88 x 10
-11
m
Previous
Skip
Next
Question # 16
We can excite an atom by
Choose an answer
Bombardment of particles
Radiating photons
Providing potential difference
All answer are true
Previous
Skip
Next
Back