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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
Photons must have energy equal to
Question # 2
An electron of the hydrogen atom in the second orbit is called its:
Question # 3
The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:
Question # 4
The natural arrangement of colours in the spectrum of white light spectrum is
Question # 5
The He-Ne laser discharge tube is filled with:
Question # 6
Static electricity is produced by the transfer of:
Question # 7
Balmer series was identified in:
Question # 8
The process of formation of spectrum is called:
Question # 9
The lasing or active medium in He-Ne laser discharge tube is:
Question # 10
The spectrum emitted from hydrogen filled discharge tube is:
Question # 11
Gaussian surface is always:
Question # 12
A metastable stae:
Question # 13
By CAT scans, we can detect the density difference of the order of:
Question # 14
An compared to solid matter, a crack or an air bubble allows:
Question # 15
The results of spectra obtained by Balmer were expressed in 1896 by:
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ECAT Physics Chapter 20 Important MCQ's
| Sr.# | Question | Answer |
|---|---|---|
| 1 | Lyman series in the spectrum of hydrogen exists in the : |
A. Infra-red region
B. Visible region
C. Ultraviolet region
D. Both(A) and (B)
|
| 2 | X-rays produced in a tube operating at 105V. The speed of X-rays produced is |
A. 3 x 108m/s
B. 3.1 x 108m/s
C. 2.8 x 108m/s
D. 1.88 x 108m/s
|
| 3 | Tick the series which lie/s in. the infra-red region. |
A. Pfund series
B. Brackett series
C. Paschen series
D. All of these
|
| 4 | In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to: |
A. Short wavelength
B. Large wavelength
C. Very large wavelenth
D. Low frequency
|
| 5 | The results of spectra obtained by Blamer were expressed in 1896 by |
A. Bohr
B. Rydberg
C. Planck
D. Rutherford
|
| 6 | If the distance between two charges is doubled,the force between them will become: |
A. Double
B. Half
C. One third
D. One fourth
|
| 7 | The results of spectra obtained by Balmer were expressed in 1896 by: |
A.
Bohr
B. Rydberg
C. Planck
D. Rutherford
|
| 8 | 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
|
| 9 | The process of formation of spectrum is called: |
A. Interference
B. Spectroscopy
C. Dispersion
D. Reflection
|
| 10 | X-rays can penetrate in a solid matte through a distance of several: |
A. Kilo metres
B. Metres
C. Centimeters
D. A few angstroms
|
Test Questions