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MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
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Total Questions15
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Time Allowed20
Physics ECAT Pre Engineering Chapter 20 Atomic Spectra
00:00
Question # 1
The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:
Question # 2
The results of spectra obtained by Balmer were expressed in 1896 by:
Question # 3
The natural arrangement of colours in the spectrum of white light spectrum is
Question # 4
Lyman series in the spectrum of hydrogen exists in the :
Question # 5
Photons must have energy equal to
Question # 6
The first shell near the neucles is
Question # 7
Balmer series lies in that region of electromagnetic wave spectrum which is called:
Question # 8
Static electricity is produced by the transfer of:
Question # 9
X-ray are also known as
Question # 10
The lasing or active medium in He-Ne laser discharge tube is:
Question # 11
Graph of Black body radiation is example of
Question # 12
Tick the series which lies in the visible region:
Question # 13
The range of wavelengths of colurs in the visible colours is
Question # 14
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
Question # 15
The life time of metastable state is equal to
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | The results of spectra obtained by Balmer were expressed in 1896 by: |
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
|
| 2 | Balmer series was identified in: |
A. 1685
B. 1785
C. 1885
D. 1985
|
| 3 | The value of the metastable state for Neon is |
A. 20.66eV
B. 20.61eV
C. 19.23eV
D. 18.70eV
|
| 4 | The first shell near the neucles is |
A. L-shell
B. X-shell
C. N-shell
D. M-shell
|
| 5 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
| 6 | Energy required by an electron revolving in certain orbit to jump to an excited state is called: |
A. Ionization energy
B. Ionization potential
C. Excitation energy
D. Excitation potential
|
| 7 | Consider a photon of continuous X-ray and a photon of characteristics X-ray of same wavelength. Which of the following is/are different for the two photons |
A. Frequency
B. Penetrating power
C. Energy
D. Method of creation
|
| 8 | The range of wavelengths of colurs in the visible colours is |
A. 140 nm to 456 nm
B. 10 nm to 56 nm
C. 410 nm to 656 nm
D. 910 nm to 956 nm
|
| 9 | Spectrum represents the number of component colours present in certain light in terms of: |
A. Wavelength
B. Frequency
C. Energy
D. Both (A) and (B)
|
| 10 | 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 |
A. Less than atmospheric pressure
B. Much less than atmospheric pressure
C. Greater than atmospheric pressure
D. Much greater than atmospheric pressure
|
Test Questions